add study flow endpoints

backend/src/analytics/mod.rs

@@ -0,0 +1,109 @@
+use std::{collections::HashMap, sync::Arc};
+
+use chrono::{DateTime, Utc};
+use serde::Deserialize;
+use tokio::sync::RwLock;
+use uuid::Uuid;
+
+use crate::sessions::SessionSnapshot;
+
+#[derive(Clone, Debug, Deserialize)]
+pub struct AnalyticsBatchRequest {
+    pub events: Vec<AnalyticsEventInput>,
+}
+
+#[derive(Clone, Debug, Deserialize)]
+pub struct AnalyticsEventInput {
+    pub event_name: String,
+    pub occurred_at: DateTime<Utc>,
+    pub attributes: Option<Vec<AttributeInput>>,
+}
+
+#[derive(Clone, Debug, Deserialize)]
+pub struct AttributeInput {
+    pub key: String,
+    pub value: String,
+}
+
+#[derive(Clone)]
+pub struct AnalyticsStore {
+    inner: Arc<RwLock<AnalyticsState>>,
+}
+
+#[derive(Default)]
+struct AnalyticsState {
+    event_types_by_name: HashMap<String, Uuid>,
+    events: Vec<AnalyticsEventSnapshot>,
+    attributes: Vec<AnalyticsEventAttributeSnapshot>,
+}
+
+#[derive(Clone)]
+#[allow(dead_code)]
+struct AnalyticsEventSnapshot {
+    id: Uuid,
+    analytics_event_type_id: Uuid,
+    session_id: Uuid,
+    user_id: Uuid,
+    occurred_at: DateTime<Utc>,
+}
+
+#[derive(Clone)]
+#[allow(dead_code)]
+struct AnalyticsEventAttributeSnapshot {
+    id: Uuid,
+    analytics_event_id: Uuid,
+    attribute_key: String,
+    attribute_value: String,
+}
+
+impl AnalyticsStore {
+    pub fn new() -> Self {
+        Self {
+            inner: Arc::new(RwLock::new(AnalyticsState::default())),
+        }
+    }
+
+    pub async fn ingest(&self, session: &SessionSnapshot, request: AnalyticsBatchRequest) -> usize {
+        let mut state = self.inner.write().await;
+        let mut inserted = 0usize;
+
+        for event in request.events {
+            let analytics_event_type_id = *state
+                .event_types_by_name
+                .entry(event.event_name.clone())
+                .or_insert_with(Uuid::new_v4);
+
+            let analytics_event_id = Uuid::new_v4();
+            state.events.push(AnalyticsEventSnapshot {
+                id: analytics_event_id,
+                analytics_event_type_id,
+                session_id: session.session_id,
+                user_id: session.user_id,
+                occurred_at: event.occurred_at,
+            });
+
+            let Some(attributes) = event.attributes else {
+                inserted += 1;
+                continue;
+            };
+
+            for attribute in attributes {
+                state.attributes.push(AnalyticsEventAttributeSnapshot {
+                    id: Uuid::new_v4(),
+                    analytics_event_id,
+                    attribute_key: attribute.key,
+                    attribute_value: attribute.value,
+                });
+            }
+
+            inserted += 1;
+        }
+
+        inserted
+    }
+
+    pub async fn counts(&self) -> (usize, usize) {
+        let state = self.inner.read().await;
+        (state.events.len(), state.attributes.len())
+    }
+}

backend/src/app_state.rs

@@ -1,19 +1,33 @@
 use std::time::Instant;
 
+use chrono::Utc;
 use redis::Client as RedisClient;
 use sqlx::PgPool;
 use uuid::Uuid;
 
+pub use crate::analytics::{AnalyticsBatchRequest, AnalyticsEventInput, AttributeInput};
+pub use crate::bets::{BetIntentRecord, BetIntentRequest, BetIntentResponse};
 pub use crate::events::{EventManifestSnapshot, EventSnapshot};
 pub use crate::events::{MarketSnapshot, OutcomeSnapshot};
+pub use crate::experiments::ExperimentConfigSnapshot;
+pub use crate::localization::LocalizationBundleSnapshot;
 pub use crate::markets::{OddsVersionSnapshot, OutcomeOddsSnapshot};
+pub use crate::settlement::SettlementSnapshot;
 pub use crate::sessions::{SessionSnapshot, SessionStartRequest};
 
 use crate::{
+    analytics::AnalyticsStore,
+    bets::{
+        BetsStore, ACCEPTANCE_ACCEPTED, ACCEPTANCE_REJECTED_INVALID_MARKET,
+        ACCEPTANCE_REJECTED_INVALID_SESSION, ACCEPTANCE_REJECTED_TOO_LATE,
+    },
     config::AppConfig,
     error::AppError,
     events::{EventsStore},
+    experiments::ExperimentsStore,
+    localization::LocalizationStore,
     markets::MarketsStore,
+    settlement::SettlementsStore,
     sessions::{SessionDefaults, SessionsStore},
     users::{UserCreateRequest, UsersStore},
 };
@@ -25,6 +39,11 @@ pub struct AppState {
     pub database_pool: Option<PgPool>,
     pub redis_client: Option<RedisClient>,
     events: EventsStore,
+    bets: BetsStore,
+    settlements: SettlementsStore,
+    experiments: ExperimentsStore,
+    localization: LocalizationStore,
+    analytics: AnalyticsStore,
     markets: MarketsStore,
     users: UsersStore,
     sessions: SessionsStore,
@@ -42,6 +61,11 @@ impl AppState {
             database_pool,
             redis_client,
             events: EventsStore::new(),
+            bets: BetsStore::new(),
+            settlements: SettlementsStore::new(),
+            experiments: ExperimentsStore::new(),
+            localization: LocalizationStore::new(),
+            analytics: AnalyticsStore::new(),
             markets: MarketsStore::new(),
             users: UsersStore::new(),
             sessions: SessionsStore::new(),
@@ -82,6 +106,150 @@ impl AppState {
         self.sessions.current_session().await
     }
 
+    fn build_bet_intent_record(
+        &self,
+        request: &BetIntentRequest,
+        user_id: Option<Uuid>,
+        accepted: bool,
+        acceptance_code: &str,
+        accepted_odds_version_id: Option<Uuid>,
+    ) -> BetIntentRecord {
+        BetIntentRecord {
+            id: Uuid::new_v4(),
+            session_id: request.session_id,
+            user_id,
+            event_id: request.event_id,
+            market_id: request.market_id,
+            outcome_id: request.outcome_id,
+            idempotency_key: request.idempotency_key.clone(),
+            client_sent_at: request.client_sent_at,
+            server_received_at: Utc::now(),
+            accepted,
+            acceptance_code: acceptance_code.to_string(),
+            accepted_odds_version_id,
+        }
+    }
+
+    pub async fn submit_bet_intent(&self, request: BetIntentRequest) -> BetIntentResponse {
+        let Some(existing) = self
+            .bets
+            .get_by_idempotency_key(&request.idempotency_key)
+            .await
+        else {
+            return self.submit_bet_intent_fresh(request).await;
+        };
+
+        existing
+    }
+
+    async fn submit_bet_intent_fresh(&self, request: BetIntentRequest) -> BetIntentResponse {
+        let Some(session) = self.current_session().await else {
+            return self
+                .bets
+                .record(self.build_bet_intent_record(
+                    &request,
+                    None,
+                    false,
+                    ACCEPTANCE_REJECTED_INVALID_SESSION,
+                    None,
+                ))
+                .await;
+        };
+
+        if session.ended_at.is_some() || session.session_id != request.session_id {
+            return self
+                .bets
+                .record(self.build_bet_intent_record(
+                    &request,
+                    Some(session.user_id),
+                    false,
+                    ACCEPTANCE_REJECTED_INVALID_SESSION,
+                    None,
+                ))
+                .await;
+        }
+
+        let Some(market) = self.markets.market(request.market_id).await else {
+            return self
+                .bets
+                .record(self.build_bet_intent_record(
+                    &request,
+                    Some(session.user_id),
+                    false,
+                    ACCEPTANCE_REJECTED_INVALID_MARKET,
+                    None,
+                ))
+                .await;
+        };
+
+        if market.event_id != request.event_id {
+            return self
+                .bets
+                .record(self.build_bet_intent_record(
+                    &request,
+                    Some(session.user_id),
+                    false,
+                    ACCEPTANCE_REJECTED_INVALID_MARKET,
+                    None,
+                ))
+                .await;
+        }
+
+        let Some(outcome) = self.markets.outcome(request.outcome_id).await else {
+            return self
+                .bets
+                .record(self.build_bet_intent_record(
+                    &request,
+                    Some(session.user_id),
+                    false,
+                    ACCEPTANCE_REJECTED_INVALID_MARKET,
+                    None,
+                ))
+                .await;
+        };
+
+        if outcome.market_id != market.id || request.event_id != market.event_id {
+            return self
+                .bets
+                .record(self.build_bet_intent_record(
+                    &request,
+                    Some(session.user_id),
+                    false,
+                    ACCEPTANCE_REJECTED_INVALID_MARKET,
+                    None,
+                ))
+                .await;
+        }
+
+        if Utc::now() >= market.lock_at {
+            return self
+                .bets
+                .record(self.build_bet_intent_record(
+                    &request,
+                    Some(session.user_id),
+                    false,
+                    ACCEPTANCE_REJECTED_TOO_LATE,
+                    None,
+                ))
+                .await;
+        }
+
+        let accepted_odds_version_id = self.current_odds(market.id).await.map(|odds| odds.id);
+        self.bets
+            .record(self.build_bet_intent_record(
+                &request,
+                Some(session.user_id),
+                true,
+                ACCEPTANCE_ACCEPTED,
+                accepted_odds_version_id,
+            ))
+            .await
+    }
+
+    pub async fn bet_intent(&self, bet_intent_id: Uuid) -> Option<BetIntentResponse> {
+        self.bets.get(bet_intent_id).await
+    }
+
     pub async fn end_session(&self) -> Result<SessionSnapshot, AppError> {
         self.sessions
             .end_session()
@@ -101,6 +269,52 @@ impl AppState {
         self.events.get_manifest(event_id).await
     }
 
+    pub async fn settlement_for_event(&self, event_id: Uuid) -> Option<SettlementSnapshot> {
+        self.settlements.settlement_for_event(event_id).await
+    }
+
+    pub async fn experiment_config(&self) -> ExperimentConfigSnapshot {
+        let Some(session) = self.current_session().await else {
+            return self
+                .experiments
+                .config_for_variant(&self.config.default_experiment_variant);
+        };
+
+        if session.ended_at.is_some() {
+            return self
+                .experiments
+                .config_for_variant(&self.config.default_experiment_variant);
+        }
+
+        self.experiments.config_for_variant(&session.experiment_variant)
+    }
+
+    pub async fn localization_bundle(
+        &self,
+        locale_code: &str,
+    ) -> Option<LocalizationBundleSnapshot> {
+        self.localization.bundle(locale_code)
+    }
+
+    pub async fn ingest_analytics_batch(
+        &self,
+        request: AnalyticsBatchRequest,
+    ) -> Result<usize, AppError> {
+        let Some(session) = self.current_session().await else {
+            return Err(AppError::not_found("No active session"));
+        };
+
+        if session.ended_at.is_some() {
+            return Err(AppError::not_found("No active session"));
+        }
+
+        Ok(self.analytics.ingest(&session, request).await)
+    }
+
+    pub async fn analytics_counts(&self) -> (usize, usize) {
+        self.analytics.counts().await
+    }
+
     pub async fn markets_for_event(&self, event_id: Uuid) -> Option<Vec<MarketSnapshot>> {
         self.markets.markets_for_event(event_id).await
     }

backend/src/bets/mod.rs

@@ -0,0 +1,116 @@
+use std::{collections::HashMap, sync::Arc};
+
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+use tokio::sync::RwLock;
+use uuid::Uuid;
+
+pub const ACCEPTANCE_ACCEPTED: &str = "accepted";
+pub const ACCEPTANCE_REJECTED_TOO_LATE: &str = "rejected_too_late";
+pub const ACCEPTANCE_REJECTED_INVALID_MARKET: &str = "rejected_invalid_market";
+pub const ACCEPTANCE_REJECTED_INVALID_SESSION: &str = "rejected_invalid_session";
+pub const ACCEPTANCE_REJECTED_DUPLICATE: &str = "rejected_duplicate";
+
+#[derive(Clone, Debug, Deserialize)]
+pub struct BetIntentRequest {
+    pub session_id: Uuid,
+    pub event_id: Uuid,
+    pub market_id: Uuid,
+    pub outcome_id: Uuid,
+    pub idempotency_key: String,
+    pub client_sent_at: DateTime<Utc>,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct BetIntentResponse {
+    pub id: Uuid,
+    pub accepted: bool,
+    pub acceptance_code: String,
+    pub accepted_odds_version_id: Option<Uuid>,
+    pub server_received_at: DateTime<Utc>,
+}
+
+#[derive(Clone, Debug)]
+pub struct BetIntentRecord {
+    pub id: Uuid,
+    pub session_id: Uuid,
+    pub user_id: Option<Uuid>,
+    pub event_id: Uuid,
+    pub market_id: Uuid,
+    pub outcome_id: Uuid,
+    pub idempotency_key: String,
+    pub client_sent_at: DateTime<Utc>,
+    pub server_received_at: DateTime<Utc>,
+    pub accepted: bool,
+    pub acceptance_code: String,
+    pub accepted_odds_version_id: Option<Uuid>,
+}
+
+impl BetIntentRecord {
+    pub fn response(&self) -> BetIntentResponse {
+        BetIntentResponse {
+            id: self.id,
+            accepted: self.accepted,
+            acceptance_code: self.acceptance_code.clone(),
+            accepted_odds_version_id: self.accepted_odds_version_id,
+            server_received_at: self.server_received_at,
+        }
+    }
+}
+
+#[derive(Clone, Default)]
+pub struct BetsStore {
+    inner: Arc<RwLock<BetsState>>,
+}
+
+#[derive(Default)]
+struct BetsState {
+    intents_by_id: HashMap<Uuid, BetIntentRecord>,
+    intents_by_idempotency_key: HashMap<String, Uuid>,
+}
+
+impl BetsStore {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    pub async fn get(&self, bet_intent_id: Uuid) -> Option<BetIntentResponse> {
+        let state = self.inner.read().await;
+        let Some(record) = state.intents_by_id.get(&bet_intent_id) else {
+            return None;
+        };
+        Some(record.response())
+    }
+
+    pub async fn get_by_idempotency_key(&self, idempotency_key: &str) -> Option<BetIntentResponse> {
+        let state = self.inner.read().await;
+        let Some(bet_intent_id) = state.intents_by_idempotency_key.get(idempotency_key).copied() else {
+            return None;
+        };
+        let Some(record) = state.intents_by_id.get(&bet_intent_id) else {
+            return None;
+        };
+        Some(record.response())
+    }
+
+    pub async fn record(&self, record: BetIntentRecord) -> BetIntentResponse {
+        let mut state = self.inner.write().await;
+
+        if let Some(existing_id) = state.intents_by_idempotency_key.get(&record.idempotency_key).copied() {
+            if let Some(existing) = state.intents_by_id.get(&existing_id) {
+                return existing.response();
+            }
+        }
+
+        let response = record.response();
+        state
+            .intents_by_idempotency_key
+            .insert(record.idempotency_key.clone(), record.id);
+        state.intents_by_id.insert(record.id, record);
+        response
+    }
+
+    pub async fn counts(&self) -> usize {
+        self.inner.read().await.intents_by_id.len()
+    }
+}

backend/src/experiments/mod.rs

@@ -0,0 +1,40 @@
+use std::collections::HashMap;
+
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct ExperimentConfigSnapshot {
+    pub variant: String,
+    pub feature_flags: HashMap<String, bool>,
+}
+
+#[derive(Clone, Default)]
+pub struct ExperimentsStore;
+
+impl ExperimentsStore {
+    pub fn new() -> Self {
+        Self
+    }
+
+    pub fn config_for_variant(&self, variant: &str) -> ExperimentConfigSnapshot {
+        ExperimentConfigSnapshot {
+            variant: variant.to_string(),
+            feature_flags: feature_flags_for_variant(variant),
+        }
+    }
+}
+
+fn feature_flags_for_variant(variant: &str) -> HashMap<String, bool> {
+    let modern = variant == "modern";
+    let mut flags = HashMap::new();
+    flags.insert("control_mode".to_string(), !modern);
+    flags.insert("modern_mode".to_string(), modern);
+    flags.insert("animation_intensity_high".to_string(), modern);
+    flags.insert("haptics_enabled".to_string(), true);
+    flags.insert("autoplay_next_enabled".to_string(), true);
+    flags.insert("countdown_style_compact".to_string(), modern);
+    flags.insert("odds_update_visualization_enabled".to_string(), modern);
+    flags.insert("result_card_style_modern".to_string(), modern);
+    flags.insert("localization_source_contracts".to_string(), true);
+    flags
+}

backend/src/lib.rs

@@ -1,11 +1,16 @@
 #![forbid(unsafe_code)]
 
+pub mod analytics;
+pub mod bets;
 pub mod app_state;
 pub mod config;
 pub mod db;
 pub mod events;
 pub mod error;
+pub mod experiments;
+pub mod localization;
 pub mod markets;
+pub mod settlement;
 pub mod sessions;
 pub mod routes;
 pub mod users;

backend/src/localization/mod.rs

@@ -0,0 +1,51 @@
+use std::collections::HashMap;
+
+use serde::{Deserialize, Serialize};
+use serde_json as json;
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct LocalizationBundleSnapshot {
+    pub locale_code: String,
+    pub values: HashMap<String, String>,
+}
+
+#[derive(Clone)]
+pub struct LocalizationStore {
+    bundles: HashMap<String, LocalizationBundleSnapshot>,
+}
+
+impl LocalizationStore {
+    pub fn new() -> Self {
+        let mut bundles = HashMap::new();
+        bundles.insert(
+            "en".to_string(),
+            load_bundle(
+                "en",
+                include_str!("../../../contracts/localization/en.json"),
+            ),
+        );
+        bundles.insert(
+            "sv".to_string(),
+            load_bundle(
+                "sv",
+                include_str!("../../../contracts/localization/sv.json"),
+            ),
+        );
+        Self { bundles }
+    }
+
+    pub fn bundle(&self, locale_code: &str) -> Option<LocalizationBundleSnapshot> {
+        let Some(bundle) = self.bundles.get(locale_code) else {
+            return None;
+        };
+        Some(bundle.clone())
+    }
+}
+
+fn load_bundle(locale_code: &str, raw: &str) -> LocalizationBundleSnapshot {
+    let values: HashMap<String, String> = json::from_str(raw).expect("valid localization bundle");
+    LocalizationBundleSnapshot {
+        locale_code: locale_code.to_string(),
+        values,
+    }
+}

backend/src/markets/mod.rs

@@ -36,6 +36,7 @@ pub struct MarketsStore {
 struct MarketsState {
     markets_by_event_id: HashMap<Uuid, Vec<MarketSnapshot>>,
     markets_by_id: HashMap<Uuid, MarketSnapshot>,
+    outcomes_by_id: HashMap<Uuid, OutcomeSnapshot>,
     current_odds_by_market_id: HashMap<Uuid, OddsVersionSnapshot>,
 }
 
@@ -54,6 +55,23 @@ impl MarketsStore {
         let home_outcome_id = Uuid::parse_str("44444444-4444-4444-4444-444444444444").expect("valid uuid");
         let away_outcome_id = Uuid::parse_str("55555555-5555-5555-5555-555555555555").expect("valid uuid");
 
+        let outcomes = vec![
+            OutcomeSnapshot {
+                id: home_outcome_id,
+                market_id,
+                outcome_code: "home".to_string(),
+                label_key: "outcome.home".to_string(),
+                sort_order: 1,
+            },
+            OutcomeSnapshot {
+                id: away_outcome_id,
+                market_id,
+                outcome_code: "away".to_string(),
+                label_key: "outcome.away".to_string(),
+                sort_order: 2,
+            },
+        ];
+
         let market = MarketSnapshot {
             id: market_id,
             event_id,
@@ -62,22 +80,7 @@ impl MarketsStore {
             status: "open".to_string(),
             lock_at: preview_lock_at,
             settlement_rule_key: "settle_on_match_winner".to_string(),
-            outcomes: vec![
-                OutcomeSnapshot {
-                    id: home_outcome_id,
-                    market_id,
-                    outcome_code: "home".to_string(),
-                    label_key: "outcome.home".to_string(),
-                    sort_order: 1,
-                },
-                OutcomeSnapshot {
-                    id: away_outcome_id,
-                    market_id,
-                    outcome_code: "away".to_string(),
-                    label_key: "outcome.away".to_string(),
-                    sort_order: 2,
-                },
-            ],
+            outcomes: outcomes.clone(),
         };
 
         let odds_version = OddsVersionSnapshot {
@@ -112,6 +115,11 @@ impl MarketsStore {
         let mut markets_by_id = HashMap::new();
         markets_by_id.insert(market_id, market);
 
+        let mut outcomes_by_id = HashMap::new();
+        for outcome in outcomes {
+            outcomes_by_id.insert(outcome.id, outcome);
+        }
+
         let mut current_odds_by_market_id = HashMap::new();
         current_odds_by_market_id.insert(market_id, odds_version);
 
@@ -119,6 +127,7 @@ impl MarketsStore {
             inner: Arc::new(RwLock::new(MarketsState {
                 markets_by_event_id,
                 markets_by_id,
+                outcomes_by_id,
                 current_odds_by_market_id,
             })),
         }
@@ -140,6 +149,14 @@ impl MarketsStore {
         Some(market.clone())
     }
 
+    pub async fn outcome(&self, outcome_id: Uuid) -> Option<OutcomeSnapshot> {
+        let state = self.inner.read().await;
+        let Some(outcome) = state.outcomes_by_id.get(&outcome_id) else {
+            return None;
+        };
+        Some(outcome.clone())
+    }
+
     pub async fn current_odds(&self, market_id: Uuid) -> Option<OddsVersionSnapshot> {
         let state = self.inner.read().await;
         let Some(odds) = state.current_odds_by_market_id.get(&market_id) else {

backend/src/routes/analytics.rs

@@ -0,0 +1,11 @@
+use axum::{extract::Extension, http::StatusCode, Json};
+
+use crate::{app_state::{AnalyticsBatchRequest, AppState}, error::AppError};
+
+pub async fn batch(
+    Extension(state): Extension<AppState>,
+    Json(payload): Json<AnalyticsBatchRequest>,
+) -> Result<StatusCode, AppError> {
+    state.ingest_analytics_batch(payload).await?;
+    Ok(StatusCode::ACCEPTED)
+}

backend/src/routes/bets.rs

@@ -0,0 +1,23 @@
+use axum::{extract::{Extension, Path}, http::StatusCode, Json};
+use uuid::Uuid;
+
+use crate::{app_state::{AppState, BetIntentRequest, BetIntentResponse}, error::AppError};
+
+pub async fn submit(
+    Extension(state): Extension<AppState>,
+    Json(payload): Json<BetIntentRequest>,
+) -> Result<(StatusCode, Json<BetIntentResponse>), AppError> {
+    let response = state.submit_bet_intent(payload).await;
+    Ok((StatusCode::CREATED, Json(response)))
+}
+
+pub async fn show(
+    Path(bet_intent_id): Path<Uuid>,
+    Extension(state): Extension<AppState>,
+) -> Result<Json<BetIntentResponse>, AppError> {
+    let Some(intent) = state.bet_intent(bet_intent_id).await else {
+        return Err(AppError::not_found("Bet intent not found"));
+    };
+
+    Ok(Json(intent))
+}

backend/src/routes/experiments.rs

@@ -0,0 +1,7 @@
+use axum::{extract::Extension, Json};
+
+use crate::{app_state::{AppState, ExperimentConfigSnapshot}, error::AppError};
+
+pub async fn config(Extension(state): Extension<AppState>) -> Result<Json<ExperimentConfigSnapshot>, AppError> {
+    Ok(Json(state.experiment_config().await))
+}

backend/src/routes/localization.rs

@@ -0,0 +1,14 @@
+use axum::{extract::{Extension, Path}, Json};
+
+use crate::{app_state::{AppState, LocalizationBundleSnapshot}, error::AppError};
+
+pub async fn bundle(
+    Path(locale_code): Path<String>,
+    Extension(state): Extension<AppState>,
+) -> Result<Json<LocalizationBundleSnapshot>, AppError> {
+    let Some(bundle) = state.localization_bundle(&locale_code).await else {
+        return Err(AppError::not_found("Localization bundle not found"));
+    };
+
+    Ok(Json(bundle))
+}

backend/src/routes/mod.rs

@@ -1,6 +1,11 @@
 pub mod health;
+pub mod analytics;
+pub mod bets;
 pub mod events;
+pub mod experiments;
+pub mod localization;
 pub mod markets;
+pub mod results;
 pub mod session;
 
 use axum::{routing::{get, post}, Router};
@@ -12,7 +17,13 @@ pub fn router() -> Router {
         .route("/api/v1/events/{event_id}", get(events::show))
         .route("/api/v1/events/{event_id}/manifest", get(events::manifest))
         .route("/api/v1/events/{event_id}/markets", get(markets::list_for_event))
+        .route("/api/v1/events/{event_id}/result", get(results::show))
         .route("/api/v1/markets/{market_id}/odds/current", get(markets::current_odds))
+        .route("/api/v1/bets/intent", post(bets::submit))
+        .route("/api/v1/bets/{bet_intent_id}", get(bets::show))
+        .route("/api/v1/analytics/batch", post(analytics::batch))
+        .route("/api/v1/experiments/config", get(experiments::config))
+        .route("/api/v1/localization/{locale_code}", get(localization::bundle))
         .route("/api/v1/session/start", post(session::start))
         .route("/api/v1/session/end", post(session::end))
         .route("/api/v1/session/me", get(session::me))

backend/src/routes/results.rs

@@ -0,0 +1,15 @@
+use axum::{extract::{Extension, Path}, Json};
+use uuid::Uuid;
+
+use crate::{app_state::{AppState, SettlementSnapshot}, error::AppError};
+
+pub async fn show(
+    Path(event_id): Path<Uuid>,
+    Extension(state): Extension<AppState>,
+) -> Result<Json<SettlementSnapshot>, AppError> {
+    let Some(settlement) = state.settlement_for_event(event_id).await else {
+        return Err(AppError::not_found("Settlement not found"));
+    };
+
+    Ok(Json(settlement))
+}

backend/src/settlement/mod.rs

@@ -0,0 +1,63 @@
+use std::collections::HashMap;
+
+use chrono::{DateTime, Duration as ChronoDuration, Utc};
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct SettlementSnapshot {
+    pub id: Uuid,
+    pub market_id: Uuid,
+    pub settled_at: DateTime<Utc>,
+    pub winning_outcome_id: Uuid,
+}
+
+#[derive(Clone, Default)]
+pub struct SettlementsStore {
+    settlements_by_event_id: HashMap<Uuid, SettlementSnapshot>,
+    settlements_by_market_id: HashMap<Uuid, SettlementSnapshot>,
+}
+
+impl SettlementsStore {
+    pub fn new() -> Self {
+        Self::with_sample_data()
+    }
+
+    pub fn with_sample_data() -> Self {
+        let event_id = Uuid::parse_str("11111111-1111-1111-1111-111111111111").expect("valid uuid");
+        let market_id = Uuid::parse_str("22222222-2222-2222-2222-222222222222").expect("valid uuid");
+        let winning_outcome_id = Uuid::parse_str("44444444-4444-4444-4444-444444444444").expect("valid uuid");
+
+        let settlement = SettlementSnapshot {
+            id: Uuid::parse_str("99999999-9999-9999-9999-999999999999").expect("valid uuid"),
+            market_id,
+            settled_at: Utc::now() - ChronoDuration::minutes(5),
+            winning_outcome_id,
+        };
+
+        let mut settlements_by_event_id = HashMap::new();
+        settlements_by_event_id.insert(event_id, settlement.clone());
+
+        let mut settlements_by_market_id = HashMap::new();
+        settlements_by_market_id.insert(market_id, settlement.clone());
+
+        Self {
+            settlements_by_event_id,
+            settlements_by_market_id,
+        }
+    }
+
+    pub async fn settlement_for_event(&self, event_id: Uuid) -> Option<SettlementSnapshot> {
+        let Some(settlement) = self.settlements_by_event_id.get(&event_id) else {
+            return None;
+        };
+        Some(settlement.clone())
+    }
+
+    pub async fn settlement_for_market(&self, market_id: Uuid) -> Option<SettlementSnapshot> {
+        let Some(settlement) = self.settlements_by_market_id.get(&market_id) else {
+            return None;
+        };
+        Some(settlement.clone())
+    }
+}

backend/tests/api_smoke.rs

@@ -1,4 +1,5 @@
 use axum::{body::{to_bytes, Body}, http::{Request, StatusCode}};
+use chrono::Utc;
 use hermes_backend::{app_state::AppState, build_router, config::AppConfig};
 use serde_json as json;
 use tower::ServiceExt;
@@ -130,6 +131,285 @@ async fn feed_next_returns_a_manifestable_event() {
     assert!(manifest["markets"].as_array().unwrap().len() >= 1);
 }
 
+#[tokio::test]
+async fn bet_intent_accepts_and_is_idempotent() {
+    let app = build_router(AppState::new(AppConfig::default(), None, None));
+
+    let session_response = app
+        .clone()
+        .oneshot(
+            Request::builder()
+                .method("POST")
+                .uri("/api/v1/session/start")
+                .header("content-type", "application/json")
+                .body(Body::from("{}"))
+                .unwrap(),
+        )
+        .await
+        .unwrap();
+
+    let session_body = to_bytes(session_response.into_body(), usize::MAX).await.unwrap();
+    let session_json: json::Value = json::from_slice(&session_body).unwrap();
+    let session_id = session_json["session_id"].as_str().unwrap().to_string();
+
+    let event_response = app
+        .clone()
+        .oneshot(Request::builder().uri("/api/v1/feed/next").body(Body::empty()).unwrap())
+        .await
+        .unwrap();
+
+    let event_body = to_bytes(event_response.into_body(), usize::MAX).await.unwrap();
+    let event_json: json::Value = json::from_slice(&event_body).unwrap();
+    let event_id = event_json["id"].as_str().unwrap().to_string();
+
+    let markets_response = app
+        .clone()
+        .oneshot(
+            Request::builder()
+                .uri(format!("/api/v1/events/{event_id}/markets"))
+                .body(Body::empty())
+                .unwrap(),
+        )
+        .await
+        .unwrap();
+
+    let markets_body = to_bytes(markets_response.into_body(), usize::MAX).await.unwrap();
+    let markets_json: json::Value = json::from_slice(&markets_body).unwrap();
+    let market_id = markets_json[0]["id"].as_str().unwrap().to_string();
+    let outcome_id = markets_json[0]["outcomes"][0]["id"].as_str().unwrap().to_string();
+
+    let request = json::json!({
+        "session_id": session_id,
+        "event_id": event_id,
+        "market_id": market_id,
+        "outcome_id": outcome_id,
+        "idempotency_key": "bet-001",
+        "client_sent_at": Utc::now().to_rfc3339(),
+    })
+    .to_string();
+
+    let response = app
+        .clone()
+        .oneshot(
+            Request::builder()
+                .method("POST")
+                .uri("/api/v1/bets/intent")
+                .header("content-type", "application/json")
+                .body(Body::from(request.clone()))
+                .unwrap(),
+        )
+        .await
+        .unwrap();
+
+    assert_eq!(response.status(), StatusCode::CREATED);
+
+    let body = to_bytes(response.into_body(), usize::MAX).await.unwrap();
+    let first_json: json::Value = json::from_slice(&body).unwrap();
+    let bet_id = first_json["id"].as_str().unwrap().to_string();
+    assert_eq!(first_json["accepted"], true);
+    assert_eq!(first_json["acceptance_code"], "accepted");
+
+    let response = app
+        .clone()
+        .oneshot(
+            Request::builder()
+                .uri(format!("/api/v1/bets/{bet_id}"))
+                .body(Body::empty())
+                .unwrap(),
+        )
+        .await
+        .unwrap();
+
+    assert_eq!(response.status(), StatusCode::OK);
+
+    let body = to_bytes(response.into_body(), usize::MAX).await.unwrap();
+    let lookup_json: json::Value = json::from_slice(&body).unwrap();
+    assert_eq!(lookup_json["id"], bet_id);
+    assert_eq!(lookup_json["accepted"], true);
+
+    let response = app
+        .oneshot(
+            Request::builder()
+                .method("POST")
+                .uri("/api/v1/bets/intent")
+                .header("content-type", "application/json")
+                .body(Body::from(request))
+                .unwrap(),
+        )
+        .await
+        .unwrap();
+
+    assert_eq!(response.status(), StatusCode::CREATED);
+
+    let body = to_bytes(response.into_body(), usize::MAX).await.unwrap();
+    let duplicate_json: json::Value = json::from_slice(&body).unwrap();
+    assert_eq!(duplicate_json["id"], bet_id);
+    assert_eq!(duplicate_json["accepted"], true);
+}
+
+#[tokio::test]
+async fn event_result_returns_settlement() {
+    let app = build_router(AppState::new(AppConfig::default(), None, None));
+
+    let event_response = app
+        .clone()
+        .oneshot(Request::builder().uri("/api/v1/feed/next").body(Body::empty()).unwrap())
+        .await
+        .unwrap();
+
+    let event_body = to_bytes(event_response.into_body(), usize::MAX).await.unwrap();
+    let event_json: json::Value = json::from_slice(&event_body).unwrap();
+    let event_id = event_json["id"].as_str().unwrap().to_string();
+
+    let markets_response = app
+        .clone()
+        .oneshot(
+            Request::builder()
+                .uri(format!("/api/v1/events/{event_id}/markets"))
+                .body(Body::empty())
+                .unwrap(),
+        )
+        .await
+        .unwrap();
+
+    let markets_body = to_bytes(markets_response.into_body(), usize::MAX).await.unwrap();
+    let markets_json: json::Value = json::from_slice(&markets_body).unwrap();
+    let market_id = markets_json[0]["id"].as_str().unwrap().to_string();
+    let winning_outcome_id = markets_json[0]["outcomes"][0]["id"].as_str().unwrap().to_string();
+
+    let response = app
+        .oneshot(
+            Request::builder()
+                .uri(format!("/api/v1/events/{event_id}/result"))
+                .body(Body::empty())
+                .unwrap(),
+        )
+        .await
+        .unwrap();
+
+    assert_eq!(response.status(), StatusCode::OK);
+
+    let body = to_bytes(response.into_body(), usize::MAX).await.unwrap();
+    let result_json: json::Value = json::from_slice(&body).unwrap();
+
+    assert_eq!(result_json["market_id"], market_id);
+    assert_eq!(result_json["winning_outcome_id"], winning_outcome_id);
+}
+
+#[tokio::test]
+async fn experiments_and_localization_work() {
+    let app = build_router(AppState::new(AppConfig::default(), None, None));
+
+    let session_response = app
+        .clone()
+        .oneshot(
+            Request::builder()
+                .method("POST")
+                .uri("/api/v1/session/start")
+                .header("content-type", "application/json")
+                .body(Body::from(
+                    json::json!({
+                        "experiment_variant": "modern"
+                    })
+                    .to_string(),
+                ))
+                .unwrap(),
+        )
+        .await
+        .unwrap();
+
+    assert_eq!(session_response.status(), StatusCode::CREATED);
+
+    let config_response = app
+        .clone()
+        .oneshot(Request::builder().uri("/api/v1/experiments/config").body(Body::empty()).unwrap())
+        .await
+        .unwrap();
+
+    assert_eq!(config_response.status(), StatusCode::OK);
+
+    let config_body = to_bytes(config_response.into_body(), usize::MAX).await.unwrap();
+    let config_json: json::Value = json::from_slice(&config_body).unwrap();
+    assert_eq!(config_json["variant"], "modern");
+    assert_eq!(config_json["feature_flags"]["modern_mode"], true);
+
+    let localization_response = app
+        .clone()
+        .oneshot(Request::builder().uri("/api/v1/localization/sv").body(Body::empty()).unwrap())
+        .await
+        .unwrap();
+
+    assert_eq!(localization_response.status(), StatusCode::OK);
+
+    let localization_body = to_bytes(localization_response.into_body(), usize::MAX).await.unwrap();
+    let localization_json: json::Value = json::from_slice(&localization_body).unwrap();
+    assert_eq!(localization_json["locale_code"], "sv");
+    assert_eq!(localization_json["values"]["common.continue"], "Fortsätt");
+
+    let localization_en_response = app
+        .oneshot(Request::builder().uri("/api/v1/localization/en").body(Body::empty()).unwrap())
+        .await
+        .unwrap();
+
+    assert_eq!(localization_en_response.status(), StatusCode::OK);
+}
+
+#[tokio::test]
+async fn analytics_batch_is_recorded() {
+    let state = AppState::new(AppConfig::default(), None, None);
+    let app = build_router(state.clone());
+
+    let session_response = app
+        .clone()
+        .oneshot(
+            Request::builder()
+                .method("POST")
+                .uri("/api/v1/session/start")
+                .header("content-type", "application/json")
+                .body(Body::from("{}"))
+                .unwrap(),
+        )
+        .await
+        .unwrap();
+
+    assert_eq!(session_response.status(), StatusCode::CREATED);
+
+    let response = app
+        .oneshot(
+            Request::builder()
+                .method("POST")
+                .uri("/api/v1/analytics/batch")
+                .header("content-type", "application/json")
+                .body(Body::from(
+                    json::json!({
+                        "events": [
+                            {
+                                "event_name": "screen_viewed",
+                                "occurred_at": Utc::now().to_rfc3339(),
+                                "attributes": [
+                                    {"key": "screen_name", "value": "feed"}
+                                ]
+                            },
+                            {
+                                "event_name": "cta_pressed",
+                                "occurred_at": Utc::now().to_rfc3339()
+                            }
+                        ]
+                    })
+                    .to_string(),
+                ))
+                .unwrap(),
+        )
+        .await
+        .unwrap();
+
+    assert_eq!(response.status(), StatusCode::ACCEPTED);
+
+    let (event_count, attribute_count) = state.analytics_counts().await;
+    assert_eq!(event_count, 2);
+    assert_eq!(attribute_count, 1);
+}
+
 #[tokio::test]
 async fn event_markets_and_current_odds_work() {
     let app = build_router(AppState::new(AppConfig::default(), None, None));