{
  "x402Version": 2,
  "id": 27607,
  "slug": "27607",
  "resource": "https://sendcheck-x402.pennyforgeorg.workers.dev/check",
  "description": "SendCheck: pre-send verification of any EVM address on one chain (EIP-55 checksum, wallet-vs-contract, outgoing activity, balances, verdict). POST {address, chain}",
  "type": "http",
  "serviceName": "sendcheck",
  "resourceType": "Security",
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:8453",
      "payTo": "0x9504A5939AB5be2B2B1F8beA7D7ebeCcd96c485D",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "amount": "10000",
      "amountUsd": 0.01,
      "maxTimeoutSeconds": 60
    }
  ],
  "outputSchema": {
    "properties": {
      "example": {
        "type": "object"
      },
      "type": {
        "type": "string"
      }
    },
    "required": [
      "type"
    ],
    "type": "object"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "address": "0x9504A5939AB5be2B2B1F8beA7D7ebeCcd96c485D",
            "chain": "base"
          },
          "bodyType": "json",
          "method": "POST",
          "type": "http"
        },
        "output": {
          "example": {
            "address": "0x9504A5939AB5be2B2B1F8beA7D7ebeCcd96c485D",
            "chain": {
              "block": 50804109,
              "chain": 8453,
              "isContract": false,
              "name": "Base",
              "native": "0.0026",
              "outgoingTxs": 3,
              "reachable": true,
              "usdc": "30.23",
              "usdcUnits": "30230079",
              "usdt": "0.00",
              "usdtUnits": "0"
            },
            "checksum": {
              "message": "Valid EIP-55 checksum address.",
              "status": "valid"
            },
            "meta": {
              "ms": 912,
              "service": "sendcheck",
              "version": "1.8.1"
            },
            "report": "SendCheck pre-send verification …",
            "verdict": {
              "gas": "0.00000039 ETH",
              "headline": "Live wallet with recent activity.",
              "level": "caution",
              "next": "Verify the recipient out-of-band before sending.",
              "reasons": [
                "…"
              ],
              "tokenMismatch": null
            }
          },
          "type": "json"
        }
      },
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "input": {
            "additionalProperties": false,
            "properties": {
              "body": {
                "properties": {
                  "address": {
                    "description": "EVM address to verify, 0x + 40 hex characters. Free format pre-check: GET /validate?address=…",
                    "type": "string"
                  },
                  "chain": {
                    "description": "Chain to scan (default: base)",
                    "enum": [
                      "base",
                      "ethereum",
                      "arbitrum",
                      "optimism",
                      "polygon"
                    ],
                    "type": "string"
                  }
                },
                "required": [
                  "address"
                ],
                "type": "object"
              },
              "bodyType": {
                "enum": [
                  "json"
                ],
                "type": "string"
              },
              "method": {
                "enum": [
                  "POST"
                ],
                "type": "string"
              },
              "type": {
                "const": "http",
                "type": "string"
              }
            },
            "required": [
              "type",
              "method",
              "bodyType",
              "body"
            ],
            "type": "object"
          },
          "output": {
            "properties": {
              "example": {
                "type": "object"
              },
              "type": {
                "type": "string"
              }
            },
            "required": [
              "type"
            ],
            "type": "object"
          }
        },
        "required": [
          "input"
        ],
        "type": "object"
      }
    },
    "x-sendcheck-attestation": {
      "info": {
        "input": {
          "body": {
            "address": "0x9504A5939AB5be2B2B1F8beA7D7ebeCcd96c485D",
            "chain": "base"
          },
          "bodyType": "json",
          "method": "POST",
          "type": "http"
        },
        "output": {
          "example": {
            "jws": "<ES256 JWS compact: b64url(header).b64url(canonical-JSON payload).b64url(64-byte signature)>",
            "key": {
              "crv": "P-256",
              "kid": "sendcheck-2026-09",
              "kty": "EC",
              "x": "<base64url P-256 X>",
              "y": "<base64url P-256 Y>"
            }
          },
          "type": "json"
        }
      },
      "jws": "eyJhbGciOiJFUzI1NiIsImtpZCI6InNlbmRjaGVjay0yMDI2LTA5In0.eyJhc3NldCI6IjB4ODMzNTg5ZkNENmVEYjZFMDhmNGM3QzMyRDRmNzFiNTRiZEEwMjkxMyIsImV4cCI6MTgyMjUyODUwMywiaWF0IjoxNzkwOTkyNTAzLCJuZXR3b3JrIjoiZWlwMTU1Ojg0NTMiLCJwYXlUbyI6IjB4OTUwNEE1OTM5QUI1YmUyQjJCMUY4YmVBN0Q3ZWJlQ2NkOTZjNDg1RCIsInJvdXRlcyI6W3sibWF4UHJpY2UiOiIwLjAxIiwicmVzb3VyY2UiOiIvY2hlY2sifSx7Im1heFByaWNlIjoiMC4wNSIsInJlc291cmNlIjoiL2RlZXAifSx7Im1heFByaWNlIjoiMC4wMSIsInJlc291cmNlIjoiL2RpbGlnZW5jZS9saXZlIn1dLCJzZXJ2aWNlIjoiaHR0cHM6Ly9hcGkucGVubnlmb3JnZS5vcmciLCJ2IjoxfQ.n35wA7QoqFUqjvHACcCN6N8jcqbQV8iMIJqMC-QiJZmaFcM94eIEVl7LZY29c_X4sQcEFtoh27hg8HkRmaIAWg",
      "key": {
        "alg": "ES256",
        "crv": "P-256",
        "kid": "sendcheck-2026-09",
        "kty": "EC",
        "use": "sig",
        "x": "byHMSJi37KTtQRTkxSj1dNRUppDNKCMqj_W7dfC45Us",
        "y": "mTV7jNFab5gU3P77chUHrdbnm3pegzrOjWdLXL3WRvs"
      },
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "input": {
            "additionalProperties": false,
            "properties": {
              "body": {
                "properties": {
                  "address": {
                    "description": "EVM address to verify, 0x + 40 hex characters. Free format pre-check: GET /validate?address=…",
                    "type": "string"
                  },
                  "chain": {
                    "description": "Chain to scan (default: base)",
                    "enum": [
                      "base",
                      "ethereum",
                      "arbitrum",
                      "optimism",
                      "polygon"
                    ],
                    "type": "string"
                  }
                },
                "required": [
                  "address"
                ],
                "type": "object"
              },
              "bodyType": {
                "enum": [
                  "json"
                ],
                "type": "string"
              },
              "method": {
                "enum": [
                  "POST"
                ],
                "type": "string"
              },
              "type": {
                "const": "http",
                "type": "string"
              }
            },
            "required": [
              "type",
              "method",
              "bodyType",
              "body"
            ],
            "type": "object"
          },
          "output": {
            "properties": {
              "example": {
                "type": "object"
              },
              "type": {
                "type": "string"
              }
            },
            "required": [
              "type"
            ],
            "type": "object"
          }
        },
        "required": [
          "input"
        ],
        "type": "object"
      }
    }
  },
  "tags": [
    "evm",
    "crypto",
    "security",
    "usdc",
    "address-verification",
    "bazaar",
    "x-sendcheck-attestation"
  ],
  "sourceHost": "sendcheck-x402.pennyforgeorg.workers.dev",
  "lastUpdated": "2026-10-13T05:18:34.724Z",
  "quality": {
    "calls30d": 5,
    "uniquePayers30d": 5,
    "lastCalledAt": "2026-10-13T05:18:34.343Z"
  },
  "metadata": {
    "serviceName": "sendcheck",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "address": "0x9504A5939AB5be2B2B1F8beA7D7ebeCcd96c485D",
              "chain": "base"
            },
            "bodyType": "json",
            "method": "POST",
            "type": "http"
          },
          "output": {
            "example": {
              "address": "0x9504A5939AB5be2B2B1F8beA7D7ebeCcd96c485D",
              "chain": {
                "block": 50804109,
                "chain": 8453,
                "isContract": false,
                "name": "Base",
                "native": "0.0026",
                "outgoingTxs": 3,
                "reachable": true,
                "usdc": "30.23",
                "usdcUnits": "30230079",
                "usdt": "0.00",
                "usdtUnits": "0"
              },
              "checksum": {
                "message": "Valid EIP-55 checksum address.",
                "status": "valid"
              },
              "meta": {
                "ms": 912,
                "service": "sendcheck",
                "version": "1.8.1"
              },
              "report": "SendCheck pre-send verification …",
              "verdict": {
                "gas": "0.00000039 ETH",
                "headline": "Live wallet with recent activity.",
                "level": "caution",
                "next": "Verify the recipient out-of-band before sending.",
                "reasons": [
                  "…"
                ],
                "tokenMismatch": null
              }
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "body": {
                  "properties": {
                    "address": {
                      "description": "EVM address to verify, 0x + 40 hex characters. Free format pre-check: GET /validate?address=…",
                      "type": "string"
                    },
                    "chain": {
                      "description": "Chain to scan (default: base)",
                      "enum": [
                        "base",
                        "ethereum",
                        "arbitrum",
                        "optimism",
                        "polygon"
                      ],
                      "type": "string"
                    }
                  },
                  "required": [
                    "address"
                  ],
                  "type": "object"
                },
                "bodyType": {
                  "enum": [
                    "json"
                  ],
                  "type": "string"
                },
                "method": {
                  "enum": [
                    "POST"
                  ],
                  "type": "string"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      },
      "x-sendcheck-attestation": {
        "info": {
          "input": {
            "body": {
              "address": "0x9504A5939AB5be2B2B1F8beA7D7ebeCcd96c485D",
              "chain": "base"
            },
            "bodyType": "json",
            "method": "POST",
            "type": "http"
          },
          "output": {
            "example": {
              "jws": "<ES256 JWS compact: b64url(header).b64url(canonical-JSON payload).b64url(64-byte signature)>",
              "key": {
                "crv": "P-256",
                "kid": "sendcheck-2026-09",
                "kty": "EC",
                "x": "<base64url P-256 X>",
                "y": "<base64url P-256 Y>"
              }
            },
            "type": "json"
          }
        },
        "jws": "eyJhbGciOiJFUzI1NiIsImtpZCI6InNlbmRjaGVjay0yMDI2LTA5In0.eyJhc3NldCI6IjB4ODMzNTg5ZkNENmVEYjZFMDhmNGM3QzMyRDRmNzFiNTRiZEEwMjkxMyIsImV4cCI6MTgyMjUyODUwMywiaWF0IjoxNzkwOTkyNTAzLCJuZXR3b3JrIjoiZWlwMTU1Ojg0NTMiLCJwYXlUbyI6IjB4OTUwNEE1OTM5QUI1YmUyQjJCMUY4YmVBN0Q3ZWJlQ2NkOTZjNDg1RCIsInJvdXRlcyI6W3sibWF4UHJpY2UiOiIwLjAxIiwicmVzb3VyY2UiOiIvY2hlY2sifSx7Im1heFByaWNlIjoiMC4wNSIsInJlc291cmNlIjoiL2RlZXAifSx7Im1heFByaWNlIjoiMC4wMSIsInJlc291cmNlIjoiL2RpbGlnZW5jZS9saXZlIn1dLCJzZXJ2aWNlIjoiaHR0cHM6Ly9hcGkucGVubnlmb3JnZS5vcmciLCJ2IjoxfQ.n35wA7QoqFUqjvHACcCN6N8jcqbQV8iMIJqMC-QiJZmaFcM94eIEVl7LZY29c_X4sQcEFtoh27hg8HkRmaIAWg",
        "key": {
          "alg": "ES256",
          "crv": "P-256",
          "kid": "sendcheck-2026-09",
          "kty": "EC",
          "use": "sig",
          "x": "byHMSJi37KTtQRTkxSj1dNRUppDNKCMqj_W7dfC45Us",
          "y": "mTV7jNFab5gU3P77chUHrdbnm3pegzrOjWdLXL3WRvs"
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "body": {
                  "properties": {
                    "address": {
                      "description": "EVM address to verify, 0x + 40 hex characters. Free format pre-check: GET /validate?address=…",
                      "type": "string"
                    },
                    "chain": {
                      "description": "Chain to scan (default: base)",
                      "enum": [
                        "base",
                        "ethereum",
                        "arbitrum",
                        "optimism",
                        "polygon"
                      ],
                      "type": "string"
                    }
                  },
                  "required": [
                    "address"
                  ],
                  "type": "object"
                },
                "bodyType": {
                  "enum": [
                    "json"
                  ],
                  "type": "string"
                },
                "method": {
                  "enum": [
                    "POST"
                  ],
                  "type": "string"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    }
  },
  "liveness": {
    "reliability": null
  },
  "verified": false,
  "featured": false,
  "provider": {
    "host": "sendcheck-x402.pennyforgeorg.workers.dev",
    "manifest_name": "sendcheck-x402.pennyforgeorg.workers.dev",
    "source": "cdp-mirror",
    "source_manifest_url": "https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources",
    "submitted_at": "2026-10-14T01:15:01.050Z"
  },
  "exampleResponse": {
    "example": {},
    "type": "string"
  }
}