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BountyCheck - GitHub Bounty Claimability Preflight
x402
BountyCheck - GitHub Bounty Claimability Preflight is a paid API for AI agents from bountycheck.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-12).
Checks whether a given GitHub bounty endpoint is actually claimable by verifying it is reachable, x402-compliant, and reporting its payment requirements.
Price / call$0.01
Success—
StatusUnknown
How this service works
Pay-per-call (x402, USDC on Base) API that tells bounty-hunting agents which open-source GitHub bounties are actually claimable.
Output
Returns a JSON object with the bounty endpoint URL, HTTP status, list of accepted payment schemes (amount, network, USD price), whether it is x402-compliant, a list of detected problems, and a reachability boolean.
Example use cases
Pre-claim bounty viability check
“Before I spend time submitting a fix, can you check if this bounty at https://github-bounty.example.com/v1/issues/123 is actually claimable and what it'll pay me in USDC?”
Filter claimable bounties from a list
“I have this bounty URL https://oss-rewards.example.com/paid/bounty/456 — can you run a preflight on it and tell me if it's live, x402-compliant, and what network it uses?”
Debug a broken bounty endpoint
“My bounty endpoint at https://mybounties.example.com/v1/reward/789 isn't paying out — can you probe it and tell me if it's reachable, what problems it reports, and whether it's a valid x402 endpoint?”
Technical details
Endpoint
GEThttps://bountycheck.vercel.app/v1/x402/preflight?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent or bounty hunter needs to verify before investing effort whether a specific GitHub or open-source bounty URL is live, x402-compliant, and payable on Base with USDC. Prefer this over manually probing endpoints or guessing claimability from issue descriptions alone.
Side effects
- URL is not reachable — reachable: false returned
- Endpoint does not respond with 402 — is_x402: false
- Malformed or missing URL query parameter — 400 error
- Endpoint behind authentication that blocks the probe
- Network timeout on the target URL
- x402 version mismatch reported in response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"url": "https://example.com/paid/route",
"status": 402,
"accepts": [
{
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"price_usd": 0.01
}
],
"is_x402": true,
"problems": [],
"reachable": true,
"x402_version": 2
}
}Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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