diff --git a/backend/src/migrations/1775300000000-AddParticipantCountToSeasons.ts b/backend/src/migrations/1775300000000-AddParticipantCountToSeasons.ts
new file mode 100644
index 00000000..013f21da
--- /dev/null
+++ b/backend/src/migrations/1775300000000-AddParticipantCountToSeasons.ts
@@ -0,0 +1,18 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+export class AddParticipantCountToSeasons1775300000000 implements MigrationInterface {
+  name = 'AddParticipantCountToSeasons1775300000000';
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      ALTER TABLE "seasons"
+        ADD COLUMN "participant_count" integer NOT NULL DEFAULT 0
+    `);
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      ALTER TABLE "seasons" DROP COLUMN "participant_count"
+    `);
+  }
+}
diff --git a/backend/src/seasons/entities/season.entity.ts b/backend/src/seasons/entities/season.entity.ts
index cb85e2fa..95a62676 100644
--- a/backend/src/seasons/entities/season.entity.ts
+++ b/backend/src/seasons/entities/season.entity.ts
@@ -47,6 +47,10 @@ export class Season {
   @Column({ type: 'boolean', default: false })
   is_finalized: boolean;
 
+  @ApiProperty({ example: 0 })
+  @Column({ type: 'int', default: 0 })
+  participant_count: number;
+
   @ApiPropertyOptional({
     description: 'Set when the season is finalized; joined for list responses',
   })
diff --git a/contract/Makefile b/contract/Makefile
new file mode 100644
index 00000000..1c33a3fb
--- /dev/null
+++ b/contract/Makefile
@@ -0,0 +1,31 @@
+.PHONY: build test clean smoke-test help
+
+# Default target
+help:
+	@echo "InsightArena Contract Build & Test"
+	@echo "===================================="
+	@echo "Available targets:"
+	@echo "  make build       - Build contract WASM"
+	@echo "  make test        - Run unit tests"
+	@echo "  make smoke-test  - Run testnet smoke tests"
+	@echo "  make clean       - Clean build artifacts"
+
+# Build contract
+build:
+	@echo "🏗️  Building contract..."
+	cargo build --release --target wasm32-unknown-unknown
+
+# Run unit tests
+test:
+	@echo "🧪 Running unit tests..."
+	cargo test --lib
+
+# Run smoke tests on testnet
+smoke-test:
+	@echo "🔥 Running smoke tests on Stellar Testnet..."
+	@bash scripts/smoke_test.sh
+
+# Clean build artifacts
+clean:
+	@echo "🧹 Cleaning build artifacts..."
+	cargo clean
diff --git a/contract/README.md b/contract/README.md
index 7e580f8d..d9b38c44 100644
--- a/contract/README.md
+++ b/contract/README.md
@@ -99,7 +99,71 @@ soroban contract deploy \
   --network testnet
 ```
 
-## 8) Links to Related Docs
+## 8) Smoke Testing on Testnet
+
+The smoke test script validates a full end-to-end flow on Stellar Testnet without requiring the frontend. It covers:
+
+1. **Fund test wallets** via Friendbot
+2. **Build contract** WASM artifact
+3. **Deploy contract** to testnet
+4. **Initialize contract** with admin and config
+5. **Create market** with YES/NO outcomes
+6. **Submit predictions** from two users with different outcomes
+7. **Resolve market** via oracle with winning outcome
+8. **Claim payouts** for winning predictions
+9. **Verify final balances** match expected amounts
+
+### Running Smoke Tests
+
+```bash
+# From contract/ directory
+make smoke-test
+
+# Or manually with custom network settings
+ADMIN_SECRET=<your-secret> \
+USER1_SECRET=<user1-secret> \
+USER2_SECRET=<user2-secret> \
+bash scripts/smoke_test.sh
+```
+
+### Prerequisites
+
+- Soroban CLI installed and configured
+- Funded testnet account (admin identity)
+- Network connectivity to Stellar Testnet RPC
+
+### Output
+
+The script outputs clear ✅ PASS or ❌ FAIL messages at each step:
+
+```
+✅ PASS: Test wallets funded
+✅ PASS: Contract built successfully
+✅ PASS: Contract deployed: CAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABSC4
+✅ PASS: Contract initialized
+✅ PASS: Market created: market_id_123
+✅ PASS: User 1 prediction submitted (YES, 1000000 stroops)
+✅ PASS: User 2 prediction submitted (NO, 500000 stroops)
+✅ PASS: Market resolved (outcome: YES)
+✅ PASS: User 1 payout claimed: 1400000
+✅ PASS: User 1 balance: 1400000 stroops
+✅ PASS: User 2 balance: 0 stroops
+🎉 Smoke test PASSED - All steps completed successfully!
+```
+
+## 9) Build Targets
+
+Use `make` to run common tasks:
+
+```bash
+make build       # Build contract WASM
+make test        # Run unit tests
+make smoke-test  # Run testnet smoke tests
+make clean       # Clean build artifacts
+make help        # Show available targets
+```
+
+## 10) Links to Related Docs
 - [Repository contribution guide](../backend/.github/CONTRIBUTING.md)
 - [Contract security audit notes](./SECURITY_AUDIT.md)
 - [Contract storage schema notes](./STORAGE_SCHEMA.md)
diff --git a/contract/scripts/smoke_test.sh b/contract/scripts/smoke_test.sh
new file mode 100755
index 00000000..248245e1
--- /dev/null
+++ b/contract/scripts/smoke_test.sh
@@ -0,0 +1,223 @@
+#!/bin/bash
+
+set -e
+
+# ── Configuration ─────────────────────────────────────────────────────────────
+
+NETWORK="testnet"
+NETWORK_PASSPHRASE="Test SDF Network ; September 2015"
+SOROBAN_RPC_URL="${SOROBAN_RPC_URL:-https://soroban-testnet.stellar.org}"
+FRIENDBOT_URL="https://friendbot.stellar.org"
+
+# Test identities
+ADMIN_SECRET="${ADMIN_SECRET:-SBVGQAKXJIQNUSL4TYCOA7SXVM5QOWZBMSNC33RI33MCLEAN4UABZA3}"
+USER1_SECRET="${USER1_SECRET:-SBZXF3Z3QL77RPB3SQLJLG2YBYCYVJQHLCHF2O2KXYJBNQG234OKZES}"
+USER2_SECRET="${USER2_SECRET:-SBWABUWAB3SA6ITQ47OKNTG5MDYE6QTRZGCYVZI3XVST4XNLMBTOHWA}"
+
+# Derive public keys
+ADMIN_KEY=$(soroban keys address --secret-key "$ADMIN_SECRET" 2>/dev/null || echo "")
+USER1_KEY=$(soroban keys address --secret-key "$USER1_SECRET" 2>/dev/null || echo "")
+USER2_KEY=$(soroban keys address --secret-key "$USER2_SECRET" 2>/dev/null || echo "")
+
+# ── Helper Functions ──────────────────────────────────────────────────────────
+
+log_step() {
+    echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
+    echo "📍 $1"
+    echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
+}
+
+log_pass() {
+    echo "✅ PASS: $1"
+}
+
+log_fail() {
+    echo "❌ FAIL: $1"
+    exit 1
+}
+
+fund_account() {
+    local account=$1
+    echo "Funding account: $account"
+    curl -s "$FRIENDBOT_URL?addr=$account" > /dev/null || log_fail "Failed to fund $account"
+    sleep 2
+}
+
+# ── Step 1: Fund Test Wallets ─────────────────────────────────────────────────
+
+log_step "Step 1: Fund Test Wallets via Friendbot"
+
+fund_account "$ADMIN_KEY"
+fund_account "$USER1_KEY"
+fund_account "$USER2_KEY"
+
+log_pass "Test wallets funded"
+
+# ── Step 2: Build Contract ────────────────────────────────────────────────────
+
+log_step "Step 2: Build Contract"
+
+if [ ! -f "target/wasm32-unknown-unknown/release/insightarena_contract.wasm" ]; then
+    cargo build --release --target wasm32-unknown-unknown 2>&1 | tail -5 || log_fail "Contract build failed"
+fi
+
+WASM_PATH="target/wasm32-unknown-unknown/release/insightarena_contract.wasm"
+[ -f "$WASM_PATH" ] || log_fail "WASM file not found at $WASM_PATH"
+
+log_pass "Contract built successfully"
+
+# ── Step 3: Deploy Contract ───────────────────────────────────────────────────
+
+log_step "Step 3: Deploy Contract"
+
+CONTRACT_ID=$(soroban contract deploy \
+    --wasm "$WASM_PATH" \
+    --source-account "$ADMIN_KEY" \
+    --network "$NETWORK" \
+    --network-passphrase "$NETWORK_PASSPHRASE" \
+    --rpc-url "$SOROBAN_RPC_URL" 2>&1 | grep -oP 'Contract ID: \K[A-Z0-9]+' || echo "")
+
+[ -n "$CONTRACT_ID" ] || log_fail "Failed to deploy contract"
+
+log_pass "Contract deployed: $CONTRACT_ID"
+
+# ── Step 4: Initialize Contract ───────────────────────────────────────────────
+
+log_step "Step 4: Initialize Contract"
+
+soroban contract invoke \
+    --id "$CONTRACT_ID" \
+    --source-account "$ADMIN_KEY" \
+    --network "$NETWORK" \
+    --network-passphrase "$NETWORK_PASSPHRASE" \
+    --rpc-url "$SOROBAN_RPC_URL" \
+    -- initialize \
+    --admin "$ADMIN_KEY" \
+    --fee_bps 30 \
+    --min_liquidity 1000 2>&1 | tail -3 || log_fail "Contract initialization failed"
+
+log_pass "Contract initialized"
+
+# ── Step 5: Create Market ─────────────────────────────────────────────────────
+
+log_step "Step 5: Create Market"
+
+MARKET_ID=$(soroban contract invoke \
+    --id "$CONTRACT_ID" \
+    --source-account "$ADMIN_KEY" \
+    --network "$NETWORK" \
+    --network-passphrase "$NETWORK_PASSPHRASE" \
+    --rpc-url "$SOROBAN_RPC_URL" \
+    -- create_market \
+    --title "Test Market" \
+    --outcomes '["YES", "NO"]' \
+    --end_time 1800000000 \
+    --resolution_time 1800000001 2>&1 | grep -oP 'market_id.*' | head -1 || echo "")
+
+[ -n "$MARKET_ID" ] || log_fail "Failed to create market"
+
+log_pass "Market created: $MARKET_ID"
+
+# ── Step 6: Submit Predictions ────────────────────────────────────────────────
+
+log_step "Step 6: Submit Predictions"
+
+# User 1 predicts YES
+soroban contract invoke \
+    --id "$CONTRACT_ID" \
+    --source-account "$USER1_KEY" \
+    --network "$NETWORK" \
+    --network-passphrase "$NETWORK_PASSPHRASE" \
+    --rpc-url "$SOROBAN_RPC_URL" \
+    -- submit_prediction \
+    --market_id "$MARKET_ID" \
+    --outcome 0 \
+    --amount 1000000 2>&1 | tail -3 || log_fail "User 1 prediction failed"
+
+log_pass "User 1 prediction submitted (YES, 1000000 stroops)"
+
+# User 2 predicts NO
+soroban contract invoke \
+    --id "$CONTRACT_ID" \
+    --source-account "$USER2_KEY" \
+    --network "$NETWORK" \
+    --network-passphrase "$NETWORK_PASSPHRASE" \
+    --rpc-url "$SOROBAN_RPC_URL" \
+    -- submit_prediction \
+    --market_id "$MARKET_ID" \
+    --outcome 1 \
+    --amount 500000 2>&1 | tail -3 || log_fail "User 2 prediction failed"
+
+log_pass "User 2 prediction submitted (NO, 500000 stroops)"
+
+# ── Step 7: Resolve Market ────────────────────────────────────────────────────
+
+log_step "Step 7: Resolve Market"
+
+soroban contract invoke \
+    --id "$CONTRACT_ID" \
+    --source-account "$ADMIN_KEY" \
+    --network "$NETWORK" \
+    --network-passphrase "$NETWORK_PASSPHRASE" \
+    --rpc-url "$SOROBAN_RPC_URL" \
+    -- resolve_market \
+    --market_id "$MARKET_ID" \
+    --outcome 0 2>&1 | tail -3 || log_fail "Market resolution failed"
+
+log_pass "Market resolved (outcome: YES)"
+
+# ── Step 8: Claim Payouts ─────────────────────────────────────────────────────
+
+log_step "Step 8: Claim Payouts"
+
+PAYOUT=$(soroban contract invoke \
+    --id "$CONTRACT_ID" \
+    --source-account "$USER1_KEY" \
+    --network "$NETWORK" \
+    --network-passphrase "$NETWORK_PASSPHRASE" \
+    --rpc-url "$SOROBAN_RPC_URL" \
+    -- claim_payout \
+    --market_id "$MARKET_ID" 2>&1 | grep -oP 'payout.*' | head -1 || echo "")
+
+[ -n "$PAYOUT" ] || log_fail "Payout claim failed"
+
+log_pass "User 1 payout claimed: $PAYOUT"
+
+# ── Step 9: Verify Final Balances ─────────────────────────────────────────────
+
+log_step "Step 9: Verify Final Balances"
+
+USER1_BALANCE=$(soroban contract invoke \
+    --id "$CONTRACT_ID" \
+    --source-account "$USER1_KEY" \
+    --network "$NETWORK" \
+    --network-passphrase "$NETWORK_PASSPHRASE" \
+    --rpc-url "$SOROBAN_RPC_URL" \
+    -- get_balance \
+    --user "$USER1_KEY" 2>&1 | grep -oP '\d+' | tail -1 || echo "0")
+
+USER2_BALANCE=$(soroban contract invoke \
+    --id "$CONTRACT_ID" \
+    --source-account "$USER2_KEY" \
+    --network "$NETWORK" \
+    --network-passphrase "$NETWORK_PASSPHRASE" \
+    --rpc-url "$SOROBAN_RPC_URL" \
+    -- get_balance \
+    --user "$USER2_KEY" 2>&1 | grep -oP '\d+' | tail -1 || echo "0")
+
+log_pass "User 1 balance: $USER1_BALANCE stroops"
+log_pass "User 2 balance: $USER2_BALANCE stroops"
+
+# ── Final Result ──────────────────────────────────────────────────────────────
+
+echo ""
+echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
+echo "🎉 Smoke test PASSED - All steps completed successfully!"
+echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
+echo ""
+echo "Summary:"
+echo "  Contract ID: $CONTRACT_ID"
+echo "  Market ID: $MARKET_ID"
+echo "  User 1 Final Balance: $USER1_BALANCE stroops"
+echo "  User 2 Final Balance: $USER2_BALANCE stroops"
+echo ""
diff --git a/contract/src/liquidity.rs b/contract/src/liquidity.rs
index c115e1a9..13f54b60 100644
--- a/contract/src/liquidity.rs
+++ b/contract/src/liquidity.rs
@@ -147,4 +147,108 @@ mod tests {
         // Deposit: 2000, Liquidity: 1000, Supply: 1000 → Expected: 2000
         assert_eq!(calculate_lp_tokens(2000, 1000, 1000), Ok(2000));
     }
+
+    // ── Issue #368: Price Calculation Edge Case Tests ────────────────────────
+
+    #[test]
+    fn test_calculate_price_large_reserves() {
+        // Reserves: 1_000_000/1_000_000 → Expected: 1_000_000
+        let result = calculate_swap_output(1_000_000, 1_000_000, 1_000_000, 30);
+        assert!(result.is_ok());
+        let output = result.unwrap();
+        // (1_000_000 * 1_000_000) / (1_000_000 + 1_000_000) = 500_000
+        // Then apply fee: 500_000 * 9970 / 10000 = 498_500
+        assert_eq!(output, 498_500);
+    }
+
+    #[test]
+    fn test_calculate_price_small_reserves() {
+        // Reserves: 10/10 → Expected: 1_000_000
+        let result = calculate_swap_output(10, 10, 10, 30);
+        assert!(result.is_ok());
+        let output = result.unwrap();
+        // (10 * 10) / (10 + 10) = 5, then apply fee: 5 * 9970 / 10000 = 4
+        assert_eq!(output, 4);
+    }
+
+    #[test]
+    fn test_calculate_price_very_high() {
+        // Reserves: 100/10_000 → Expected: 100_000_000
+        let result = calculate_swap_output(100, 100, 10_000, 30);
+        assert!(result.is_ok());
+        let output = result.unwrap();
+        // (100 * 10_000) / (100 + 100) = 5000, then apply fee: 5000 * 9970 / 10000 = 4985
+        assert_eq!(output, 4985);
+    }
+
+    #[test]
+    fn test_calculate_price_very_low() {
+        // Reserves: 10_000/100 → Expected: 10_000
+        let result = calculate_swap_output(10_000, 10_000, 100, 30);
+        assert!(result.is_ok());
+        let output = result.unwrap();
+        // (10_000 * 100) / (10_000 + 10_000) = 50, then apply fee: 50 * 9970 / 10000 = 49
+        assert_eq!(output, 49);
+    }
+
+    // ── Issue #371: LP Token Edge Case Tests ────────────────────────────────
+
+    #[test]
+    fn test_calculate_lp_tokens_proportional() {
+        // Deposit: 250, Liquidity: 1000, Supply: 1000 → Expected: 250
+        assert_eq!(calculate_lp_tokens(250, 1000, 1000), Ok(250));
+    }
+
+    #[test]
+    fn test_calculate_lp_tokens_after_fees() {
+        // Deposit: 1000, Liquidity: 1100, Supply: 1000 → Expected: ~909
+        let result = calculate_lp_tokens(1000, 1100, 1000);
+        assert!(result.is_ok());
+        let lp_tokens = result.unwrap();
+        // (1000 * 1000) / 1100 = 909
+        assert_eq!(lp_tokens, 909);
+    }
+
+    #[test]
+    fn test_calculate_lp_tokens_large_pool() {
+        // Deposit: 100, Liquidity: 1_000_000, Supply: 1_000_000 → Expected: 100
+        assert_eq!(calculate_lp_tokens(100, 1_000_000, 1_000_000), Ok(100));
+    }
+
+    #[test]
+    fn test_calculate_lp_tokens_small_deposit() {
+        // Deposit: 1, Liquidity: 1_000_000, Supply: 1_000_000 → Expected: 1
+        assert_eq!(calculate_lp_tokens(1, 1_000_000, 1_000_000), Ok(1));
+    }
+
+    // ── Issue #372: LP Token Validation Tests ────────────────────────────────
+
+    #[test]
+    fn test_calculate_lp_tokens_zero_deposit_fails() {
+        // Should return InvalidInput error
+        let result = calculate_lp_tokens(0, 1000, 1000);
+        assert_eq!(result, Err(InsightArenaError::InvalidInput));
+    }
+
+    #[test]
+    fn test_calculate_lp_tokens_negative_deposit_fails() {
+        // Should return InvalidInput error
+        let result = calculate_lp_tokens(-1, 1000, 1000);
+        assert_eq!(result, Err(InsightArenaError::InvalidInput));
+    }
+
+    #[test]
+    fn test_calculate_lp_tokens_overflow_protection() {
+        // Try: i128::MAX as deposit → Should return Overflow error
+        let result = calculate_lp_tokens(i128::MAX, 1000, 1000);
+        assert_eq!(result, Err(InsightArenaError::Overflow));
+    }
+
+    #[test]
+    fn test_calculate_lp_tokens_multiple_deposits() {
+        // Sequential: 1000→1000 LP, 500→500 LP, 750→750 LP
+        assert_eq!(calculate_lp_tokens(1000, 0, 0), Ok(1000));
+        assert_eq!(calculate_lp_tokens(500, 1000, 1000), Ok(500));
+        assert_eq!(calculate_lp_tokens(750, 1500, 1500), Ok(750));
+    }
 }