Roundhouse

CounterpartyCheck by AgentGate

Crypto counterparty due diligence API. Counterparty due-diligence report: everything in lite plus contract verification and deployer screening (Sourcify), ENS and Basename (forward-verified), cross-chain presence (wrong-chain protection for smart wallets and Safes), Safe owner and contract owner screening and explorer labels. Verdict ok / caution / block with reasons and confidence.

DataLiveeip155:8453Exactvia cdp
https://api.youraitools.co/counterpartycheck/v1/quick
CryptoCounterparty-riskDue-diligenceWallet-screeningCheck_counterparty
Calls · 30d
3
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 4 snapshots so far.
$256.05
Verified settled volume
226 settlements proven x402 by their on-chain EIP-3009 marker.
$0.015
Listed price
As published in the catalog. Always read the live 402 before paying.
3
Calls · 30d
Upstream's own call count for this endpoint, not ours.
2
Unique payers · 30d
Last called 2026-10-25 01:03Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "error": "X-PAYMENT header is required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F",
      "scheme": "exact",
      "network": "base",
      "mimeType": "application/json",
      "resource": "https://api.youraitools.co/counterpartycheck/v1/quick",
      "description": "Counterparty due-diligence report: everything in lite plus contract verification and deployer screening (Sourcify), ENS and Basename (forward-verified), cross-chain presence (wrong-chain protection for smart wallets and Safes), Safe owner and contract owner screening and explorer labels. Verdict ok / caution / block with reasons and confidence.",
      "outputSchema": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "chain": {
              "type": "string",
              "required": false,
              "description": "Chain of the payment (default base; a base58 address implies solana)"
            },
            "intent": {
              "type": "string",
              "required": false,
              "description": "What you are about to do (default pay): changes which signals matter, e.g. paying a token contract or approving an EOA"
            },
            "address": {
              "type": "string",
              "required": true,
              "description": "Counterparty address: EVM 0x + 40 hex, or a Solana base58 address"
            }
          },
          "discoverable": true
        },
        "output": {
          "tier": "quick",
          "chain": "ethereum",
          "facts": {
            "kind": "eip7702_delegated_eoa",
            "nonce": 5969,
            "delegate": "0x5a7fc11397e9a8ad41bf10bf13f22b0a63f96f6d"
          },
          "checks": {
            "identity": {
              "ens": {
                "name": "vitalik.eth",
                "verified": true
              }
            },
            "cross_chain": {
              "base": {
                "kind": "eoa",
                "nonce": 0
              }
            }
          },
          "intent": "pay",
          "address": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
          "reasons": [
            {
              "code": "eip7702",
              "text": "EOA with an EIP-7702 delegation to 0x5a7fc11397e9a8ad41bf10bf13f22b0a63f96f6d: its code is the delegate contract.",
              "severity": "info"
            },
            {
              "code": "verified",
              "text": "Delegate contract source verified on Sourcify.",
              "severity": "good"
            },
            {
              "code": "ens",
              "text": "ENS name vitalik.eth (reverse record, forward-verified).",
              "severity": "good"
            }
          ],
          "summary": "OK: no risk signal found for this eip7702 delegated eoa on Ethereum (verified, ens).",
          "verdict": "ok",
          "confidence": "high"
        }
      },
      "maxAmountRequired": "15000",
      "maxTimeoutSeconds": 120
    }
  ],
  "message": "Payment required: CounterpartyCheck GET /counterpartycheck/v1/quick costs $0.015 per call in USDC. Before an agent pays, approves or interacts with an address: ok / caution / block with reasons and a confidence field. Pay per call in USDC with any x402 client: read the PAYMENT-REQUIRED header (x402 v2) or the accepts list in this body (x402 v1), sign the payment and retry the same request with the PAYMENT-SIGNATURE (v2) or X-PAYMENT (v1) header. Networks: Base, Polygon, Arbitrum, Solana. No account, no API key. No crypto wallet? Buy prepaid credits by card or USDC at https://api.youraitools.co/credits/ and send them as a Bearer key. Free: No daily free quota on the paid route; free preview at https://api.youraitools.co/counterpartycheck/v1/preview (rate-limited per minute) and free-tier MCP access via the YourAITools MCP Hub https://api.youraitools.co/mcp/hub.",
  "x402Version": 1,
  "payment_help": {
    "docs": "https://api.youraitools.co/counterpartycheck/",
    "tool": "CounterpartyCheck",
    "what": "Before an agent pays, approves or interacts with an address: ok / caution / block with reasons and a confidence field. OFAC SDN and ScamSniffer lists, wallet vs contract vs EIP-7702, verification and deployer, ENS / Basename, cross-chain (wrong-chain) check, age, recent activity and exposure, approval magnets, x402 directory presence. EVM (Base, Ethereum, Polygon, Arbitrum) and Solana. A safety check, not advice.",
    "price": "$0.015 per call (USDC)",
    "route": "GET https://api.youraitools.co/counterpartycheck/v1/quick",
    "mcp_hub": "https://api.youraitools.co/mcp/hub",
    "free_tier": "No daily free quota on the paid route; free preview at https://api.youraitools.co/counterpartycheck/v1/preview (rate-limited per minute) and free-tier MCP access via the YourAITools MCP Hub https://api.youraitools.co/mcp/hub.",
    "pay_with_x402": "Pay per call in USDC with any x402 client: read the PAYMENT-REQUIRED header (x402 v2) or the accepts list in this body (x402 v1), sign the payment and retry the same request with the PAYMENT-SIGNATURE (v2) or X-PAYMENT (v1) header. Networks: Base, Polygon, Arbitrum, Solana. No account, no API key.",
    "pay_with_credits": {
      "url": "https://api.youraitools.co/credits/",
      "use": "Send the key as Authorization: Bearer yatc_... on the same request; each call is deducted at the listed price.",
      "card": "Pay by card (Stripe): $5, $20 or $50 credit packs, no crypto wallet needed.",
      "wallet": "Or buy $1 or $5 of credits in USDC with the one-click browser wallet button on the same page.",
      "card_checkout": "https://api.youraitools.co/credits/ (choose a pack under Pay by card; Stripe checkout opens in one click)"
    }
  }
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.015USDC≈ $0.015 USD
on Base · exact scheme

Pay 0.015 USDC on Base to 0x3c1A…08d6F. The signed payment is good for 2 minutes.

Paid to
0x3c1A…08d6F
USD Coin contract
0x8335…02913
Payment window
2 minutes
As published
15000 smallest units
15000units
on Polygon · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to
0x3c1A…08d6F
Token contract
0x3c49…c3359
Payment window
2 minutes
15000units
on Arbitrum · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to
0x3c1A…08d6F
Token contract
0xaf88…e5831
Payment window
2 minutes
15000units
on solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to
FH73Wb…L2Jte
Token contract
EPjFWd…TDt1v
Payment window
2 minutes
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F",
    "amount": "15000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 120
  },
  {
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F",
    "amount": "15000",
    "scheme": "exact",
    "network": "eip155:137",
    "maxTimeoutSeconds": 120
  },
  {
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F",
    "amount": "15000",
    "scheme": "exact",
    "network": "eip155:42161",
    "maxTimeoutSeconds": 120
  },
  {
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "extra": {
      "feePayer": "GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb"
    },
    "payTo": "FH73WbbUe2UyNzfy72MJs5nT3NxyDf9GrqE7kzjL2Jte",
    "amount": "15000",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "maxTimeoutSeconds": 120
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "chain": "base",
          "intent": "pay",
          "address": "0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "tier": "quick",
          "chain": "ethereum",
          "facts": {
            "kind": "eip7702_delegated_eoa",
            "nonce": 5969,
            "delegate": "0x5a7fc11397e9a8ad41bf10bf13f22b0a63f96f6d"
          },
          "checks": {
            "identity": {
              "ens": {
                "name": "vitalik.eth",
                "verified": true
              }
            },
            "cross_chain": {
              "base": {
                "kind": "eoa",
                "nonce": 0
              }
            }
          },
          "intent": "pay",
          "address": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
          "reasons": [
            {
              "code": "eip7702",
              "text": "EOA with an EIP-7702 delegation to 0x5a7fc11397e9a8ad41bf10bf13f22b0a63f96f6d: its code is the delegate contract.",
              "severity": "info"
            },
            {
              "code": "verified",
              "text": "Delegate contract source verified on Sourcify.",
              "severity": "good"
            },
            {
              "code": "ens",
              "text": "ENS name vitalik.eth (reverse record, forward-verified).",
              "severity": "good"
            }
          ],
          "summary": "OK: no risk signal found for this eip7702 delegated eoa on Ethereum (verified, ens).",
          "verdict": "ok",
          "confidence": "high"
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method"
          ],
          "properties": {
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "type": "object",
              "required": [
                "address"
              ],
              "properties": {
                "chain": {
                  "enum": [
                    "base",
                    "ethereum",
                    "polygon",
                    "arbitrum",
                    "solana"
                  ],
                  "type": "string",
                  "description": "Chain of the payment (default base; a base58 address implies solana)"
                },
                "intent": {
                  "enum": [
                    "pay",
                    "approve",
                    "interact"
                  ],
                  "type": "string",
                  "description": "What you are about to do (default pay): changes which signals matter, e.g. paying a token contract or approving an EOA"
                },
                "address": {
                  "type": "string",
                  "description": "Counterparty address: EVM 0x + 40 hex, or a Solana base58 address"
                }
              },
              "description": "Search intents: wallet due diligence, contract verification check, ens lookup, address reputation, crypto kyt, counterparty report"
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object",
              "properties": {
                "tier": {
                  "type": "string"
                },
                "chain": {
                  "type": "string"
                },
                "facts": {
                  "type": "object"
                },
                "checks": {
                  "type": "object"
                },
                "intent": {
                  "type": "string"
                },
                "address": {
                  "type": "string"
                },
                "reasons": {
                  "type": "array"
                },
                "summary": {
                  "type": "string"
                },
                "verdict": {
                  "type": "string"
                },
                "confidence": {
                  "type": "string"
                }
              }
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-10-25 01:03Z
Last indexed by Roundhouse
2026-10-26 20:00Z
Last enriched (probe, favicon, geo)
2026-10-26 12:16Z
x402 version
2
Max timeout
120s
Liveness probe
HTTP 402
Report

Hand this page to an agent

Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.

GET api.roundhouseai.io/v0/endpoints

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 4 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md
Show the prompt
Using Roundhouse, look up the x402 service CounterpartyCheck by AgentGate and tell me whether it is
worth paying: what a call costs, whether the endpoint answered when last probed, and what
its payment record actually shows.

curl -s 'https://api.roundhouseai.io/v0/endpoints?q=CounterpartyCheck%20by%20AgentGate'
curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>'

Then call it: read the price from the live 402 at https://api.youraitools.co/counterpartycheck/v1/quick, never from
a cached figure, and pay with an x402 client.

The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except
/v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at
GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at
https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.