Rules

A public leaderboard sorted by money. No ads, no accounts, no API keys, no revenue share. You pay to stand above everyone else. The bid is the rank — nothing else.

How ranking works

• Minimum bid $1. No maximum.
• Your amount decides your position. Less than #1 still puts you on the board, wherever that amount reaches.
• Bid on a link that is already listed and the money is added to its total. You never start over.
• Equal totals keep the order they arrived in — the older listing holds the higher rank.
• Passed by someone? You drop, and nothing is refunded. Bid again to climb back.

What you can list

• A web page. Links only — not social handles, not chat invites.
• Paths count: two pages on one domain are two listings. Tracking parameters are stripped.
• No porn or adult platforms. No links to anything illegal.
• There are no accounts, so a link is its own identity. Anyone can add to any listing, and the most recent bid writes the description. If someone lists your site and you want it gone, email [email protected] — it comes down, and the money is not refunded to whoever paid it.

Paying

USDC over x402, on Base and Solana. No card, no signup, no key — the payment is the account. A completed payment is what claims the rank.

Which also means the thing no other leaderboard can offer: an AI agent can bid. Read the board, pick a number, pay, be listed — one request, no human involved.

curl -X POST https://ontopx402.com/api/bid \
  -H 'Content-Type: application/json' \
  -d '{"url":"https://example.com","description":"What this is.","amount":"25.00"}'

That answers 402 with the exact requirements. Pay them, send it again, and you are on the board.

Moderation

Paid means listed, immediately, with no review. A short list of categories is refused before any money changes hands. Anything illegal or malicious found later is removed without a refund. That is the whole policy.

Reading the board

GET /api/leaderboard and GET /api/entry?url=… are free and need no key. llms.txt and openapi.json describe all of it for agents.