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Chain Evidence Check
x402
Chain Evidence Check is a paid API for AI agents from api.aiskills402.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-11-01).
Judges whether an on-chain observation (transaction receipt, block, balance, RPC response) truly proves a specific claim about a payment, wallet, or EVM RPC endpoint, returning a binary verdict with reasoning.
Price / call$0.05
Success—
StatusUnknown
How this service works
Chain Evidence Check — Judges whether an on-chain observation really proves a claim about a payment, a wallet or an RPC endpoint on an EVM chain, and answers as JSON with a binary verdict, the reason and the one check that would decide. Knows the readings that answer for the wrong thing - a null transaction receipt seconds after settlement, a block explorer that indexes a minute late and a balance view that lags its own transfer list, a public RPC endpoint that refuses receipts with an error or…
Output
A JSON object with a binary verdict (true/false), a plain-language reason explaining the judgment, and identification of the single decisive check that would confirm or refute the claim. The response also includes the SKILL.md content, a sha256 hash, settlement transaction reference, and a redownload token for future access.
Example use cases
Post-settlement receipt timing dispute
“My agent says the transaction receipt came back null right after I paid, but the funds left my wallet. Can you judge whether that null receipt is real evidence that the payment failed, or just an RPC indexing lag?”
Block explorer late-indexing false negative
“A block explorer is showing my transaction as unconfirmed a full minute after it was included in a block — does that explorer reading actually prove the payment didn't go through, or is the explorer just slow to index?”
Wallet balance lag vs transfer list mismatch
“My wallet balance hasn't updated yet but the transfer list shows the funds moved — can you verify whether the stale balance view is valid proof that the payment is still pending, or if the transfer list is the authoritative source?”
Technical details
Endpoint
GEThttps://api.aiskills402.com/v1/skills/chain-evidence-check/file?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent or developer needs to reason about whether a specific on-chain data point (receipt, balance, explorer response) is actually sufficient evidence for a claim — especially in x402 payment flows, automated settlement verification, or when debugging false-negative payment proofs on EVM chains. It is purpose-built for the specific failure modes of EVM evidence interpretation (timing lags, RPC errors, indexer delays) rather than generic blockchain analytics.
Side effects
- Ambiguous or incomplete observation description may result in an inconclusive verdict
- RPC endpoints that refuse receipts with errors may not provide enough data for a definitive judgment
- Payment via x402 required — unpaid requests will return a 402 response
- Highly novel chain configurations or non-standard EVM forks may fall outside the model's training
- Edge cases involving simultaneous chain reorganizations may produce uncertain verdicts
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"file": {
"name": "SKILL.md",
"content": "<the SKILL.md file>",
"encoding": "utf-8"
},
"name": "Chain Evidence Check",
"skill": "chain-evidence-check",
"sha256": "<sha256 of SKILL.md>",
"receipt": {
"tx": "0x<settlement transaction>",
"settled": true
},
"version": "1.0.0",
"redownload": {
"url": "<api>/v1/purchases/<token>",
"token": "<64 hex chars>"
}
}
}Tags
x402
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