Sports data on Solana: how TxODDS puts verifiable odds on-chain and what you can build

// Verification flow: prove a specific odds figure was published
// at a given timestamp and hasn't changed

// 1. Fetch the Merkle root from Solana for the relevant block
const solanaRpc = new Connection("https://api.mainnet-beta.solana.com");
const txlineAccount = await solanaRpc.getAccountInfo(TXLINE_PROGRAM_ID);
// Root is written here on each data batch

// 2. Request the Merkle proof for your specific data point from TxLINE API
const proof = await fetch(
  `https://txline.txodds.com/api/proof?fixture=${fixtureId}&timestamp=${ts}`,
  { headers: { Authorization: `Bearer ${apiToken}` } }
).then(r => r.json());
// { root, leaf, path: [...siblings], timestamp }

// 3. Recompute the root from the proof — if it matches Solana, data is genuine
function verifyMerkleProof(leaf: string, path: string[], root: string): boolean {
  let current = leaf;
  for (const sibling of path) {
    current = sha256(current < sibling ? current + sibling : sibling + current);
  }
  return current === root;
}

const valid = verifyMerkleProof(proof.leaf, proof.path, proof.root);
// true → data is tamper-evident, matches on-chain commitment

# Step 1: acquire TxL tokens (USDT → TxL via on-chain swap)
# Request a quote, then sign and broadcast the purchase transaction

# Step 2: subscribe on-chain
# Option A: standard bundle (predefined league set)
# Option B: custom — select specific league IDs

# Step 3: activate your API token
# Sign a message: txSignature + leagueSelection + credentials
# POST to activation endpoint → receive API token + JWT

# Free tier — no payment required:
# World Cup 2026 (all 104 games) + International Friendlies
# Access the quickstart at: txline-docs.txodds.com

// Fetching live World Cup odds (free tier, no token required)
const jwt = await fetch("https://txline.txodds.com/auth/guest/start")
  .then(r => r.json())
  .then(d => d.token);

// Get current fixtures
const fixtures = await fetch(
  "https://txline.txodds.com/api/fixtures?competition=FIFA_WC_2026",
  { headers: { Authorization: `Bearer ${jwt}` } }
).then(r => r.json());

// Live odds for a fixture
const odds = await fetch(
  `https://txline.txodds.com/api/odds?fixtureId=${fixtures[0].id}&market=1x2`,
  { headers: { Authorization: `Bearer ${jwt}` } }
).then(r => r.json());
// { home: 1.85, draw: 3.40, away: 4.50, timestamp: 1751155200000, merkleRoot: "..." }

// Simplified settlement instruction
// In a real program: read TxLINE account, verify Merkle proof, resolve pool

pub fn settle_market(
    ctx: Context<SettleMarket>,
    fixture_id: u64,
    home_score: u8,
    away_score: u8,
    merkle_proof: Vec<[u8; 32]>,
) -> Result<()> {
    let txline = &ctx.accounts.txline_data;

    // Verify the proof against the on-chain Merkle root
    let leaf = hash_score(fixture_id, home_score, away_score);
    require!(
        verify_merkle_proof(leaf, &merkle_proof, txline.root),
        ErrorCode::InvalidProof
    );

    // Data verified — settle positions based on outcome
    let outcome = if home_score > away_score { Home } else if away_score > home_score { Away } else { Draw };
    resolve_positions(&ctx, outcome)?;
    Ok(())
}

// Agent loop: monitor live scores, close positions on goals
const eventSource = new EventSource(
  "https://txline.txodds.com/stream/live?fixtureId=123",
  { headers: { Authorization: `Bearer ${token}` } }
);

eventSource.onmessage = async (event) => {
  const update = JSON.parse(event.data);
  if (update.type === "GOAL") {
    // Score changed — re-evaluate open positions
    const currentOdds = update.odds["1x2"];
    // If odds moved enough, close or adjust position
    await adjustPosition(currentOdds, update.score);
  }
};

# Free World Cup access — start immediately, no payment
# 1. Get a guest JWT
curl -X POST https://txline.txodds.com/auth/guest/start

# 2. List available World Cup fixtures
curl https://txline.txodds.com/api/fixtures?competition=FIFA_WC_2026 \
  -H "Authorization: Bearer <jwt>"

# 3. Fetch live odds for a match
curl "https://txline.txodds.com/api/odds?fixtureId=<id>&market=1x2" \
  -H "Authorization: Bearer <jwt>"

# Full docs: txline-docs.txodds.com
# Developer hub: txodds.net/developer-hub
# Hackathon: superteam.fun/earn/hackathon/world-cup/