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CounterpartyCheck
x402
CounterpartyCheck is a paid API for AI agents from counterparty.agentgate.workers.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-30).
Pre-payment due diligence on a blockchain address: returns a single ok/caution/block verdict with OFAC, scam, contract-type, and activity signals before you pay, approve, or interact.
Price / call$0.05
Success—
StatusUnknown
How this service works
Pre-payment due diligence for AI agents: before paying, approving or interacting with an address on Base, Ethereum, Polygon, Arbitrum One or Solana, get one decision (ok / caution / block) with reasons, a confidence and missing_data. Composes OFAC SDN and ScamSniffer screening, the x402 Bazaar payee directory, wallet vs contract vs token vs Safe vs EIP-7702, verification and deployer, ENS / Basename, cross-chain presence, age, recent activity and exposure, approvals and TokenVerdict. Free public data only; informational safety check, no guarantees.
Output
A JSON object with: a top-level verdict (ok/caution/block), a confidence level (high/medium/low), a human-readable summary, an array of reasons each with a code, text, and severity, plus facts about the address (kind, token info, ENS/Basename, deployer, age, cross-chain presence, recent activity, approvals) and a missing_data field indicating gaps in available data.
Example use cases
Safe-to-pay check before agentic transfer
“Before you send that 50 USDC payment on Base, run a counterparty check on 0xAbCd...1234 and block it if the verdict comes back as caution or block.”
Screening a DeFi contract before approval
“I'm about to approve this Arbitrum contract 0x1234...abcd to spend my tokens — can you screen it first and tell me if it's verified, who deployed it, and whether I should proceed?”
Sanction and scam check for a Solana payee
“Check the Solana address 9xDef...7890 before I pay an invoice — I need to know if it's on any sanctions list, flagged as a scam, and how old and active the wallet is.”
Technical details
Endpoint
GEThttps://counterparty.agentgate.workers.dev/v1/full?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent is about to execute or authorize any on-chain action — payment, token approval, or contract interaction — and needs a fast, single-call safety verdict before proceeding. It uniquely composes OFAC SDN, ScamSniffer, x402 Bazaar directory, contract-type classification, ENS/Basename resolution, and TokenVerdict into one response, saving agents from building multi-source pipelines. Prefer it over raw blockchain RPC calls when you need a human-readable risk decision rather than raw on-chain data.
Side effects
- Invalid or malformed address format returns an error
- Unsupported chain returns a validation error
- Unknown or brand-new address may return low confidence with missing_data populated
- Rate limiting or upstream data source outages may degrade signal quality
- Solana address on an EVM chain (or vice versa) may fail or return misleading results
- No guarantee of completeness — free public data only, informational only
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"tier": "full",
"chain": "base",
"facts": {
"kind": "contract",
"token": {
"symbol": "USDC",
"decimals": 6
}
},
"checks": {
"age": {
"at": "2023-08-18T18:36:29.000Z",
"days": 1160,
"basis": "contract creation block",
"block": 2797221,
"known": true
}
},
"intent": "pay",
"address": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"reasons": [
{
"code": "token_contract",
"text": "This is the USDC token contract itself, not a wallet: tokens sent to a token contract are usually lost.",
"severity": "danger"
},
{
"code": "known_label",
"text": "Known address: USDC (Circle, Base).",
"severity": "good"
},
{
"code": "verified",
"text": "Contract source verified on Sourcify (FiatTokenProxy).",
"severity": "good"
},
{
"code": "established",
"text": "Established: contract creation block 1160 days ago (2023-08-18).",
"severity": "good"
}
],
"summary": "BLOCK: This is the USDC token contract itself, not a wallet: tokens sent to a token contract are usually lost.",
"verdict": "block",
"confidence": "high"
}
}Tags
x402
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