Provably fair
Commit-reveal + drand quicknet. Publishable, re-runnable proofs.
Leaderboards anyone can verify.
Rankings nobody can rig.
RankFuel is the provably-fair leaderboard and ranking-settlement layer for apps, games, communities, and AI agents. One API. One MCP server. Cryptographic proof that the standings are honest.
Cloudflare edge · provably-fair by drand · API + MCP native · pairs with Rewards Fuel
Live demo leaderboards
Golf long drive · NBA points · home run derby · March Madness pools — trending scores update automatically.
Every leaderboard asks you to trust it. Most don't deserve it.
- When money, prizes, or reputation ride on a ranking, "trust our sort" stops being good enough.
- Tiebreaks, random draws, and winner selection happen behind a curtain — users can't check.
- Building race-free, multi-tenant, verifiably fair ranking is a backend project you didn't want.
- Autonomous agents need to verify standings before they act — "trust me" isn't an API response.
A leaderboard is easy. A leaderboard people believe is the hard part. That's what we sell.
Three steps. Cryptographic spine.
- Open — Create a leaderboard, open a period. RankFuel publishes a cryptographic commitment up front.
- Compete — Scores stream in via API or MCP. Edge Durable Objects keep rankings consistent worldwide.
- Settle — Lock to a future drand round, reveal the seed, write a downloadable proof. Anyone re-runs the math.
Drop-in rankings with receipts
Edge-native
Cloudflare Workers + Durable Objects. Strongly consistent, globally fast.
API-first
REST, idempotent writes, tenant isolation, typed errors.
MCP-native
Agents submit, read, and verify_ranking as native tools.
Any look
Themed embeds: sports, beauty, gaming, minimal, dark, terminal.
Settlement rails
Rewards Fuel for prizes · RFWIN for provably-fair winner picks.
Live in minutes. Honest by construction.
curl -X POST https://api.rnkfl.com/v1/leaderboards/spring-cup/scores \
-H "Authorization: Bearer $RANKFUEL_KEY" \
-H "Idempotency-Key: $(uuidgen)" \
-d '{ "subject_id": "player_42", "value": 9820, "subject_label": "Rob" }' REST + MCP · idempotent writes · one-script embed · verify_ranking is a function call, not a support ticket.
RankFuel doesn't stop at the standings
RankFuel decides who's winning. Rewards Fuel delivers what they win. RFWIN proves who gets it — fairly.
Stack pricing — all three products
One Rewards Fuel subscription — Contests, RFWIN, and RankFuel included. Same plans on every site.
ContestsRFWINRankFuel
Free
$0
Try the full stack — contests, verified draws, and leaderboards.
- Contests: core entry methods, unlimited contests & entries
- RFWIN: 100 entries/draw · 3 draws/month · public verification
- RankFuel: 3 leaderboards · 10k score writes/mo · public proofs
Marketing Master
$13.95/mo
Bloggers and small businesses — contests, draws, and boards together.
- Contests: 15 entry methods · AI assistant · MCP · hosted pages
- RFWIN: 500 entries/draw · unlimited draws · custom certificates
- RankFuel: 10 leaderboards · 100k writes/mo · all themes & appearance
Promoter
$19.95/mo
Growing brands — geo targeting, analytics, and scale.
- Contests: 19 entry methods · country geo blocking
- RFWIN: unlimited entries · bio links · remove watermark
- RankFuel: 25 leaderboards · 500k writes/mo · MCP server
Promoter Pro
$29.95/mo
Full automation across contests, winner picks, and rankings.
- Contests: all 20+ methods · auto winner pick · scheduled draws
- RFWIN: auto pick & email · scheduled drawings · white label
- RankFuel: unlimited boards · 2M writes/mo · RF + RFWIN settlement rails
Full comparison
| Feature | Free | Marketing Master | Promoter | Promoter Pro |
|---|---|---|---|---|
| Billing | ||||
| Monthly price | Free | $13.95 | $19.95 | $29.95 |
| Annual price (2 months free) | — | $139.50/yr | $199.50/yr | $299.50/yr |
| Contests | ||||
| Entry methods | Core set | 15 | 19 | All 20+ |
| Unlimited contests & entries | ✓ | ✓ | ✓ | ✓ |
| Embed widget & hosted pages | ✓ | ✓ | ✓ | ✓ |
| WordPress plugin | ✓ | ✓ | ✓ | ✓ |
| Geo country blocking | — | — | ✓ | ✓ |
| AI contest assistant | — | ✓ | ✓ | ✓ |
| Auto winner pick & email | — | — | — | ✓ |
| Scheduled prize draws | — | — | — | ✓ |
| RFWIN | ||||
| Entries per draw | 100 | 500 | Unlimited | Unlimited |
| Draws per month | 3 | Unlimited | Unlimited | Unlimited |
| Verification certificate | ✓ | ✓ | ✓ | ✓ |
| Custom certificate templates | — | ✓ | ✓ | ✓ |
| Bio link winner pages | Up to 5 links | Unlimited | Advanced | White label |
| RFWIN watermark | Yes | Yes | Removed | Removed |
| Auto pick & email winners | — | — | — | ✓ |
| RankFuel | ||||
| Leaderboards | 3 | 10 | 25 | Unlimited |
| Score writes / month | 10k | 100k | 500k | 2M |
| Provably-fair proofs | ✓ | ✓ | ✓ | ✓ |
| Themes & appearance (light/dark/auto) | Minimal | All presets | All presets | All + white label |
| RankFuel MCP server | ✓ | ✓ | ✓ | ✓ |
| Settlement rails (RF prizes + RFWIN picks) | — | — | — | ✓ |
| Billing | ||||
| MCP for AI agents (all products) | RFWIN only | ✓ | ✓ | ✓ |
| Priority support | — | — | — | ✓ |
Provably fair is included on every plan. Upgrade or cancel anytime; annual billing saves two months (10 months charged for 12 months of service).