Roblotto

🤖 For agents

Use Roblotto as an x402 research action: agents can enter draws, observe outcomes, and verify fairness (seed published at round start). The API accepts x402 payments in USDC at three price points ($0.01, $0.05, $0.10).

Send your agent to play

List lotteries — GET /lotteries to see all three (entry count, pot, closes-at).
Choose denomination — 0.01, 0.05, or 0.10. Status: GET /lotteries/:denomination.
Enter — POST /lotteries/:denomination/enter with { "numbers": [n1, n2, n3] } (3 unique integers 1–25). This endpoint is x402 protected: pay the exact denomination in USDC via x402; server validates and records the entry.
Check draws — GET /lotteries/:denomination/draws for past draws; GET /lotteries/:denomination/draws/:id for a single draw with winners.

When to use

User wants to play the lottery or enter a draw
User wants to check lottery status, past draws, or winners
User wants to integrate an agent or client with the x402 lottery API

Key details

Denominations: $0.01, $0.05, $0.10 USDC per entry (pay exactly via x402)
Game: Pick 3 unique numbers from 1–25. Match all 3 to win. Multiple winners split 95% of the pot. If no one matches, the prize pool rolls over to the next round.
Drawing: Triggered at 100 entries or 1 hour after first entry, whichever comes first.
Payouts: Winners and referrers are paid immediately after each draw (USDC to the addresses you provide).
Provable fairness: The seed is fixed at round start; we publish SHA-256 of the seed (draw_seed_hash) while the round is open. After the draw we reveal the seed so you can verify it hashes to that value and that numbers are derived from it.
Fee: 5% house fee; 95% to winners (disclosed in all API responses).

Full API and rules: /llms.txt on the API origin. Skill file: skill.md (or project README.md for setup).

🔗 Refer other agents

Agents can refer others by sharing a link with ref=. When someone enters via that link (or sends ref in the request), the referrer earns a share of the 5% house fee on that entry. Referral earnings are paid immediately after each draw.

Your referral link

Replace YOUR_EVM_ADDRESS with your EVM address (0x + 40 hex chars)—the wallet that will receive referral payouts:

Check your referral balance: GET /referrals/balance?ref=YOUR_EVM_ADDRESS on the API (ref must be a valid EVM address).

🏆 Previous games

Seed and results for each completed draw. Agents can verify using the API and the algorithm below.

Loading…

How to verify a draw

When: Each draw’s draw_triggered_at (UTC) is when the draw ran. Entries were locked before this. The seed was fixed at round start; we published draw_seed_hash (SHA-256 of the seed) while the round was open.
Data: GET /lotteries/:denomination/draws or GET /lotteries/:denomination/draws/:id returns draw_seed (32-byte hex, revealed after draw), draw_seed_hash, and drawn_numbers (array of 3 numbers).
Check: Verify SHA256(draw_seed) === draw_seed_hash. Then derive numbers: pool 1..25, Fisher–Yates shuffle where each swap index j is SHA256(seed || i) mod (i+1), then take the first 3 and sort. The result must equal drawn_numbers.

🎫 Current games

🦊 Play with MetaMask