{
  "x402Version": 2,
  "id": 37699,
  "slug": "37699",
  "resource": "https://api.vextorium.com/v1/eip712-review",
  "description": "Explain an EIP-712 typed-data signature before signing it: x402/EIP-3009 payment authorizations, EIP-2612 permits, Permit2 and Seaport orders. Flags unlimited allowances, long validity and non-official tokens, and returns the exact hash to compare with your wallet.",
  "type": "http",
  "serviceName": "Vextorium",
  "resourceType": "Security",
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:8453",
      "payTo": "0xb9f06D2734B7E9D7b21B64C4D8b95bd774b71aCf",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "amount": "5000",
      "amountUsd": 0.005,
      "maxTimeoutSeconds": 300
    },
    {
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "payTo": "HcjfmZLgWRZzwj4deEiS7pewc4KBYSw39mW5nTyt3pz2",
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "amount": "5000",
      "amountUsd": 0.005,
      "maxTimeoutSeconds": 300
    },
    {
      "scheme": "exact",
      "network": "eip155:10",
      "payTo": "0xb9f06D2734B7E9D7b21B64C4D8b95bd774b71aCf",
      "asset": "0x0b2C639c533813f4Aa9D7837CAf62653d097Ff85",
      "amount": "5000",
      "maxTimeoutSeconds": 604900
    },
    {
      "scheme": "exact",
      "network": "eip155:5042",
      "payTo": "0xb9f06D2734B7E9D7b21B64C4D8b95bd774b71aCf",
      "asset": "0x3600000000000000000000000000000000000000",
      "amount": "5000",
      "maxTimeoutSeconds": 604900
    }
  ],
  "outputSchema": {
    "properties": {
      "example": {
        "properties": {
          "alerts": {
            "items": {},
            "type": [
              "array",
              "null"
            ]
          },
          "application": {
            "type": [
              "string",
              "null"
            ]
          },
          "domain_separator": {
            "type": [
              "string",
              "null"
            ]
          },
          "hash_to_sign": {
            "type": [
              "string",
              "null"
            ]
          },
          "message_hash": {
            "type": [
              "string",
              "null"
            ]
          },
          "network": {
            "type": [
              "string",
              "null"
            ]
          },
          "note": {
            "type": [
              "string",
              "null"
            ]
          },
          "summary": {
            "properties": {
              "action": {
                "type": [
                  "string",
                  "null"
                ]
              },
              "amount": {
                "type": [
                  "string",
                  "null"
                ]
              },
              "for": {
                "type": [
                  "string",
                  "null"
                ]
              },
              "since": {
                "type": [
                  "string",
                  "null"
                ]
              },
              "token": {
                "type": [
                  "string",
                  "null"
                ]
              },
              "valid_since": {
                "type": [
                  "string",
                  "null"
                ]
              },
              "valid_until": {
                "type": [
                  "string",
                  "null"
                ]
              }
            },
            "type": [
              "object",
              "null"
            ]
          },
          "type": {
            "type": [
              "string",
              "null"
            ]
          },
          "verdict": {
            "type": [
              "string",
              "null"
            ]
          },
          "verifier_contract": {
            "type": [
              "string",
              "null"
            ]
          }
        },
        "type": [
          "object",
          "null"
        ]
      },
      "type": {
        "type": "string"
      }
    },
    "required": [
      "type"
    ],
    "type": "object"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "signature_data": {
              "domain": {
                "chainId": 8453,
                "name": "USD Coin",
                "verifyingContract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
                "version": "2"
              },
              "message": {
                "from": "0x1111111111111111111111111111111111111111",
                "nonce": "0xabababababababababababababababababababababababababababababababab",
                "to": "0x2222222222222222222222222222222222222222",
                "validAfter": "1790634093",
                "validBefore": "1790634453",
                "value": "10000"
              },
              "primaryType": "TransferWithAuthorization",
              "types": {
                "TransferWithAuthorization": [
                  {
                    "name": "from",
                    "type": "address"
                  },
                  {
                    "name": "to",
                    "type": "address"
                  },
                  {
                    "name": "value",
                    "type": "uint256"
                  },
                  {
                    "name": "validAfter",
                    "type": "uint256"
                  },
                  {
                    "name": "validBefore",
                    "type": "uint256"
                  },
                  {
                    "name": "nonce",
                    "type": "bytes32"
                  }
                ]
              }
            }
          },
          "bodyType": "json",
          "method": "POST",
          "type": "http"
        },
        "output": {
          "example": {
            "alerts": [],
            "application": "USD Coin",
            "domain_separator": "0x02fa7265e7c5d81118673727957699e4d68f74cd74b7db77da710fe8a2c7834f",
            "hash_to_sign": "0x06a81ecc73b8782ba9eb12a8dabd4e939c996fdf315485be12b25b0272724806",
            "message_hash": "0xa77c7438121ad832f331edb2dd5a83d0eb089d6d9ebc14b26dc245ea9f447b32",
            "network": "Base",
            "note": "Compare 'hash_to_sign' with the one your wallet shows: if they match, you are signing exactly this.",
            "summary": {
              "action": "Authorize a payment (EIP-3009, the one x402 uses on EVM networks)",
              "amount": "0.01 USDC",
              "for": "0x2222222222222222222222222222222222222222",
              "since": "0x1111111111111111111111111111111111111111",
              "token": "USDC oficial",
              "valid_since": "2026-09-28 22:21 UTC",
              "valid_until": "2026-09-28 22:27 UTC"
            },
            "type": "TransferWithAuthorization",
            "verdict": "ok",
            "verifier_contract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
          },
          "type": "json"
        }
      },
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "input": {
            "additionalProperties": false,
            "properties": {
              "body": {
                "properties": {
                  "signature_data": {
                    "description": "EIP-712 object as passed to eth_signTypedData_v4: domain, types, primaryType, message",
                    "type": "object"
                  }
                },
                "required": [
                  "signature_data"
                ]
              },
              "bodyType": {
                "enum": [
                  "json",
                  "form-data",
                  "text"
                ],
                "type": "string"
              },
              "method": {
                "enum": [
                  "POST"
                ],
                "type": "string"
              },
              "type": {
                "const": "http",
                "type": "string"
              }
            },
            "required": [
              "type",
              "method",
              "bodyType",
              "body"
            ],
            "type": "object"
          },
          "output": {
            "properties": {
              "example": {
                "properties": {
                  "alerts": {
                    "items": {},
                    "type": [
                      "array",
                      "null"
                    ]
                  },
                  "application": {
                    "type": [
                      "string",
                      "null"
                    ]
                  },
                  "domain_separator": {
                    "type": [
                      "string",
                      "null"
                    ]
                  },
                  "hash_to_sign": {
                    "type": [
                      "string",
                      "null"
                    ]
                  },
                  "message_hash": {
                    "type": [
                      "string",
                      "null"
                    ]
                  },
                  "network": {
                    "type": [
                      "string",
                      "null"
                    ]
                  },
                  "note": {
                    "type": [
                      "string",
                      "null"
                    ]
                  },
                  "summary": {
                    "properties": {
                      "action": {
                        "type": [
                          "string",
                          "null"
                        ]
                      },
                      "amount": {
                        "type": [
                          "string",
                          "null"
                        ]
                      },
                      "for": {
                        "type": [
                          "string",
                          "null"
                        ]
                      },
                      "since": {
                        "type": [
                          "string",
                          "null"
                        ]
                      },
                      "token": {
                        "type": [
                          "string",
                          "null"
                        ]
                      },
                      "valid_since": {
                        "type": [
                          "string",
                          "null"
                        ]
                      },
                      "valid_until": {
                        "type": [
                          "string",
                          "null"
                        ]
                      }
                    },
                    "type": [
                      "object",
                      "null"
                    ]
                  },
                  "type": {
                    "type": [
                      "string",
                      "null"
                    ]
                  },
                  "verdict": {
                    "type": [
                      "string",
                      "null"
                    ]
                  },
                  "verifier_contract": {
                    "type": [
                      "string",
                      "null"
                    ]
                  }
                },
                "type": [
                  "object",
                  "null"
                ]
              },
              "type": {
                "type": "string"
              }
            },
            "required": [
              "type"
            ],
            "type": "object"
          }
        },
        "required": [
          "input"
        ],
        "type": "object"
      }
    }
  },
  "tags": [
    "eip-712",
    "signature",
    "security",
    "permit",
    "x402",
    "bazaar"
  ],
  "sourceHost": "api.vextorium.com",
  "lastUpdated": "2026-10-03T20:33:32.976Z",
  "quality": {
    "calls30d": 1,
    "uniquePayers30d": 1,
    "lastCalledAt": "2026-10-03T20:33:32.731Z"
  },
  "metadata": {
    "serviceName": "Vextorium",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "signature_data": {
                "domain": {
                  "chainId": 8453,
                  "name": "USD Coin",
                  "verifyingContract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
                  "version": "2"
                },
                "message": {
                  "from": "0x1111111111111111111111111111111111111111",
                  "nonce": "0xabababababababababababababababababababababababababababababababab",
                  "to": "0x2222222222222222222222222222222222222222",
                  "validAfter": "1790634093",
                  "validBefore": "1790634453",
                  "value": "10000"
                },
                "primaryType": "TransferWithAuthorization",
                "types": {
                  "TransferWithAuthorization": [
                    {
                      "name": "from",
                      "type": "address"
                    },
                    {
                      "name": "to",
                      "type": "address"
                    },
                    {
                      "name": "value",
                      "type": "uint256"
                    },
                    {
                      "name": "validAfter",
                      "type": "uint256"
                    },
                    {
                      "name": "validBefore",
                      "type": "uint256"
                    },
                    {
                      "name": "nonce",
                      "type": "bytes32"
                    }
                  ]
                }
              }
            },
            "bodyType": "json",
            "method": "POST",
            "type": "http"
          },
          "output": {
            "example": {
              "alerts": [],
              "application": "USD Coin",
              "domain_separator": "0x02fa7265e7c5d81118673727957699e4d68f74cd74b7db77da710fe8a2c7834f",
              "hash_to_sign": "0x06a81ecc73b8782ba9eb12a8dabd4e939c996fdf315485be12b25b0272724806",
              "message_hash": "0xa77c7438121ad832f331edb2dd5a83d0eb089d6d9ebc14b26dc245ea9f447b32",
              "network": "Base",
              "note": "Compare 'hash_to_sign' with the one your wallet shows: if they match, you are signing exactly this.",
              "summary": {
                "action": "Authorize a payment (EIP-3009, the one x402 uses on EVM networks)",
                "amount": "0.01 USDC",
                "for": "0x2222222222222222222222222222222222222222",
                "since": "0x1111111111111111111111111111111111111111",
                "token": "USDC oficial",
                "valid_since": "2026-09-28 22:21 UTC",
                "valid_until": "2026-09-28 22:27 UTC"
              },
              "type": "TransferWithAuthorization",
              "verdict": "ok",
              "verifier_contract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "body": {
                  "properties": {
                    "signature_data": {
                      "description": "EIP-712 object as passed to eth_signTypedData_v4: domain, types, primaryType, message",
                      "type": "object"
                    }
                  },
                  "required": [
                    "signature_data"
                  ]
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                },
                "method": {
                  "enum": [
                    "POST"
                  ],
                  "type": "string"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "alerts": {
                      "items": {},
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "application": {
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "domain_separator": {
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "hash_to_sign": {
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "message_hash": {
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "network": {
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "note": {
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "summary": {
                      "properties": {
                        "action": {
                          "type": [
                            "string",
                            "null"
                          ]
                        },
                        "amount": {
                          "type": [
                            "string",
                            "null"
                          ]
                        },
                        "for": {
                          "type": [
                            "string",
                            "null"
                          ]
                        },
                        "since": {
                          "type": [
                            "string",
                            "null"
                          ]
                        },
                        "token": {
                          "type": [
                            "string",
                            "null"
                          ]
                        },
                        "valid_since": {
                          "type": [
                            "string",
                            "null"
                          ]
                        },
                        "valid_until": {
                          "type": [
                            "string",
                            "null"
                          ]
                        }
                      },
                      "type": [
                        "object",
                        "null"
                      ]
                    },
                    "type": {
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "verdict": {
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "verifier_contract": {
                      "type": [
                        "string",
                        "null"
                      ]
                    }
                  },
                  "type": [
                    "object",
                    "null"
                  ]
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    }
  },
  "liveness": {
    "reliability": null
  },
  "verified": false,
  "featured": false,
  "provider": {
    "host": "api.vextorium.com",
    "manifest_name": "api.vextorium.com",
    "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": {
      "alerts": [
        "value"
      ],
      "application": "string",
      "domain_separator": "string",
      "hash_to_sign": "string",
      "message_hash": "string",
      "network": "string",
      "note": "string",
      "summary": {
        "action": "string",
        "amount": "string",
        "for": "string",
        "since": "string",
        "token": "string",
        "valid_since": "string",
        "valid_until": "string"
      },
      "type": "string",
      "verdict": "string",
      "verifier_contract": "string"
    },
    "type": "string"
  }
}