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CoinOpSelect Attestation Build API
x402
CoinOpSelect Attestation Build API is a paid API for AI agents from coinop.publicvm.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-21).
Builds an on-chain attestation object for a given contract, wallet, or token query using the x402 payment protocol on Base.
Price / call$0.01
Success—
StatusUnknown
How this service works
Paid on-chain token, wallet, contract and research data over x402 on Base.
Output
Returns a JSON object containing a query identifier (e.g. 'attestation-build') and an attestation object representing the structured, verifiable on-chain data result for the submitted query.
Example use cases
Contract behavior attestation
“Build an attestation for the USDC contract on Base — I want a structured attestation object that summarizes what the contract does so I can verify it.”
Wallet activity attestation
“Generate an attestation for this wallet address on Base — summarize its recent on-chain activity and give me the attestation result.”
Token research with attestation
“I need an attestation for the token at this Base contract address — build it with a summary of what the token is and return the attestation data.”
Technical details
Endpoint
POSThttps://coinop.publicvm.com/api/v1/attestation/build?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a verifiable, structured attestation object built from on-chain Base network data — particularly for smart contract summaries, wallet analysis, or token research that requires a cryptographically anchored result rather than a plain data lookup.
Side effects
- Invalid or missing input string results in a malformed request error
- Unparseable contract or wallet address causes query failure
- Payment not completed via x402 results in 402 Payment Required response
- Network or RPC failure on Base chain causes data unavailability
- Empty or ambiguous query string returns an incomplete attestation object
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | string | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"query": "attestation-build",
"attestation": {}
}
}Tags
x402
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