CounterpartyCheck Full by AgentGate is a paid API for AI agents from api.youraitools.co, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-23).
Performs a comprehensive pre-payment counterparty check on an EVM or Solana address, returning a verdict (block/warn/pass), confidence level, risk reasons, and on-chain facts before an agent sends funds.
Full crypto counterparty due diligence API. Full counterparty due diligence before an agent pays or interacts: quick plus age (first transaction or creation block), recent activity and direct exposure to sanctioned or scam-listed addresses, recent token approvals to the address (drainer pattern) and TokenVerdict for Base tokens; Solana adds history depth. Verdict ok / caution / block with reasons, confidence and missing_data.
Returns a JSON object with: verdict (block/warn/pass), confidence (high/medium/low), a human-readable summary, an array of reasons each with a severity (danger/warn/good) and explanatory text, on-chain facts (contract vs EOA, token metadata if applicable), address age and creation block, chain, and the original intent and address echoed back.
GEThttps://api.youraitools.co/counterpartycheck/v1/full?utm_source=zero.xyzUse this endpoint when an AI agent needs a comprehensive, multi-signal risk assessment before executing a crypto payment or approval — especially when the agent must justify its decision with labeled reasons and severity levels. Prefer the full tier over lighter checks when the payment is significant, the counterparty is unknown, or you need to distinguish token contracts from wallets, check verification status, and get an establishment age. Choose this over a simple sanctions screen (PayGuard) when you want on-chain contract analysis, not just OFAC matching.
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
{
"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"
}
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