{
  "x402Version": 2,
  "id": 36259,
  "slug": "36259",
  "resource": "https://chainstate.schemasure.com/v1/chain/state",
  "description": "Profile a Base address in one call instead of four to six lookups. Returns contract or externally owned plus code size, proxy detection across all seven slot layouts including the legacy OpenZeppelin slot Base USDC uses, the resolved implementation, ERC-165 and behavioural ERC-20 detection, token metadata, requested ERC-20 balances, and denylist hits. Answers unknown rather than guessing, and null rather than false when a contract stays silent. Not a guarantee that an address is safe.",
  "type": "http",
  "serviceName": "ChainState",
  "resourceType": "Identity & Enrichment",
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:8453",
      "payTo": "0x9876af0F6D8Ed5155Cd02d1ca56D128601612690",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "amount": "20000",
      "amountUsd": 0.02,
      "maxTimeoutSeconds": 60
    }
  ],
  "outputSchema": {
    "properties": {
      "example": {
        "properties": {
          "result": {
            "required": [
              "address",
              "account",
              "proxy",
              "interfaces",
              "token",
              "balances",
              "unresolved"
            ],
            "type": "object"
          },
          "verdict": {
            "description": "Precedence: block, then unknown, then warn, then allow.",
            "enum": [
              "allow",
              "warn",
              "block",
              "unknown"
            ],
            "type": "string"
          }
        },
        "required": [
          "ok",
          "verdict",
          "risk_codes",
          "evidence",
          "result",
          "request_hash"
        ],
        "type": "object"
      },
      "type": {
        "type": "string"
      }
    },
    "required": [
      "type"
    ],
    "type": "object"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
          },
          "bodyType": "json",
          "method": "POST",
          "type": "http"
        },
        "output": {
          "example": {
            "confidence": 1,
            "data_versions": {
              "abi_packs": "2026-08-03.1",
              "chain": "eip155:8453",
              "denylist": "2026-08-03.1",
              "policy": "2026-09-19",
              "proxy_slots": "7"
            },
            "evidence": [
              {
                "code": "INTERFACE_PROBE_UNANSWERED",
                "detail": "This contract did not answer supportsInterface, so ERC-721 and ERC-1155 support is reported as null. That is not evidence against them: plenty of live contracts predate ERC-165 entirely.",
                "severity": "info",
                "source": "erc165"
              },
              {
                "code": "PROXY_UPGRADEABLE",
                "data": {
                  "admin": "0x4fc7850364958d97B4d3f5A08f79db2493f8cA44",
                  "implementation": "0x2Ce6311ddAE708829bc0784C967b7d77D19FD779",
                  "kind": "zeppelinos"
                },
                "detail": "This is an upgradeable zeppelinos proxy. Everything reported here describes the implementation deployed right now; the admin can point it elsewhere before your next call lands, so this is a risk signal rather than metadata.",
                "severity": "medium",
                "source": "proxy-slots"
              }
            ],
            "ok": true,
            "policy_version": "2026-09-19",
            "request_hash": "sha256:96b41fa639c553a6dc6bfaa1d8ccc056912abc36e8bbde3d65f3e1edc2bd147f",
            "result": {
              "account": {
                "code_size": 1852,
                "detail": "1852 bytes of runtime code",
                "is_contract": true
              },
              "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
              "balances": [],
              "chain": "eip155:8453",
              "denylist_hits": [],
              "interfaces": {
                "detail": "supportsInterface did not answer, so ERC-721 and ERC-1155 are reported as unknown rather than absent; ERC-20 is confirmed behaviourally from totalSupply, decimals, and balanceOf",
                "erc1155": null,
                "erc165": null,
                "erc20": true,
                "erc721": null
              },
              "proxy": {
                "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
                "admin": "0x4fc7850364958d97B4d3f5A08f79db2493f8cA44",
                "beacon": null,
                "detail": "resolved through the legacy zeppelinos slot; the EIP-1967 slot is empty on this contract, which is the case for Base USDC",
                "implementation": "0x2Ce6311ddAE708829bc0784C967b7d77D19FD779",
                "kind": "zeppelinos",
                "slots_probed": [
                  {
                    "address": "0x2Ce6311ddAE708829bc0784C967b7d77D19FD779",
                    "label": "zeppelinos.implementation",
                    "slot": "0x7050c9e0f4ca769c69bd3a8ef740bc37934f8e2c036e5a723fd8ee048ed3f8c3",
                    "value": "0x0000000000000000000000002ce6311ddae708829bc0784c967b7d77d19fd779"
                  },
                  {
                    "address": "0x4fc7850364958d97B4d3f5A08f79db2493f8cA44",
                    "label": "zeppelinos.admin",
                    "slot": "0x10d6a54a4754c8869d6886b5f5d7fbfa5b4522237ea5c60d11bc4e7a1ff9390b",
                    "value": "0x0000000000000000000000004fc7850364958d97b4d3f5a08f79db2493f8ca44"
                  }
                ],
                "upgradeable": true
              },
              "rpc": {
                "configured": true,
                "endpoints": [],
                "reachable": true
              },
              "token": {
                "decimals": 6,
                "detail": "symbol, decimals, and totalSupply read from the token",
                "symbol": "USDC",
                "total_supply": "4305008625389354"
              },
              "unresolved": [
                "ERC-165 interface support: supportsInterface did not answer"
              ]
            },
            "risk_codes": [
              "PROXY_UPGRADEABLE"
            ],
            "verdict": "warn",
            "warnings": []
          },
          "type": "json"
        }
      },
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "input": {
            "additionalProperties": false,
            "properties": {
              "body": {
                "$schema": "https://json-schema.org/draft/2020-12/schema",
                "additionalProperties": false,
                "properties": {
                  "address": {
                    "description": "The Base address to profile. Case-insensitive; normalised to EIP-55.",
                    "pattern": "^0x[0-9a-fA-F]{40}$",
                    "type": "string"
                  },
                  "selector": {
                    "description": "Only used for EIP-2535 diamonds, which have no single implementation and resolve their executing code per selector. Ignored for every other proxy kind.",
                    "pattern": "^0x[0-9a-fA-F]{8}$",
                    "type": "string"
                  },
                  "tokens": {
                    "description": "ERC-20 contracts to read balanceOf(address) on for the subject. Amounts come back in base units with the token's decimals, or null with a reason.",
                    "items": {
                      "pattern": "^0x[0-9a-fA-F]{40}$",
                      "type": "string"
                    },
                    "maxItems": 10,
                    "type": "array"
                  }
                },
                "required": [
                  "address"
                ],
                "title": "ChainStateRequest",
                "type": "object"
              },
              "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": {
                  "result": {
                    "required": [
                      "address",
                      "account",
                      "proxy",
                      "interfaces",
                      "token",
                      "balances",
                      "unresolved"
                    ],
                    "type": "object"
                  },
                  "verdict": {
                    "description": "Precedence: block, then unknown, then warn, then allow.",
                    "enum": [
                      "allow",
                      "warn",
                      "block",
                      "unknown"
                    ],
                    "type": "string"
                  }
                },
                "required": [
                  "ok",
                  "verdict",
                  "risk_codes",
                  "evidence",
                  "result",
                  "request_hash"
                ],
                "type": "object"
              },
              "type": {
                "type": "string"
              }
            },
            "required": [
              "type"
            ],
            "type": "object"
          }
        },
        "required": [
          "input"
        ],
        "type": "object"
      }
    }
  },
  "tags": [
    "base",
    "address",
    "proxy",
    "erc20",
    "erc165",
    "bazaar"
  ],
  "sourceHost": "chainstate.schemasure.com",
  "lastUpdated": "2026-10-11T07:38:04.545Z",
  "quality": {
    "calls30d": 28,
    "uniquePayers30d": 3,
    "lastCalledAt": "2026-10-11T07:38:04.256Z"
  },
  "metadata": {
    "serviceName": "ChainState",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
            },
            "bodyType": "json",
            "method": "POST",
            "type": "http"
          },
          "output": {
            "example": {
              "confidence": 1,
              "data_versions": {
                "abi_packs": "2026-08-03.1",
                "chain": "eip155:8453",
                "denylist": "2026-08-03.1",
                "policy": "2026-09-19",
                "proxy_slots": "7"
              },
              "evidence": [
                {
                  "code": "INTERFACE_PROBE_UNANSWERED",
                  "detail": "This contract did not answer supportsInterface, so ERC-721 and ERC-1155 support is reported as null. That is not evidence against them: plenty of live contracts predate ERC-165 entirely.",
                  "severity": "info",
                  "source": "erc165"
                },
                {
                  "code": "PROXY_UPGRADEABLE",
                  "data": {
                    "admin": "0x4fc7850364958d97B4d3f5A08f79db2493f8cA44",
                    "implementation": "0x2Ce6311ddAE708829bc0784C967b7d77D19FD779",
                    "kind": "zeppelinos"
                  },
                  "detail": "This is an upgradeable zeppelinos proxy. Everything reported here describes the implementation deployed right now; the admin can point it elsewhere before your next call lands, so this is a risk signal rather than metadata.",
                  "severity": "medium",
                  "source": "proxy-slots"
                }
              ],
              "ok": true,
              "policy_version": "2026-09-19",
              "request_hash": "sha256:96b41fa639c553a6dc6bfaa1d8ccc056912abc36e8bbde3d65f3e1edc2bd147f",
              "result": {
                "account": {
                  "code_size": 1852,
                  "detail": "1852 bytes of runtime code",
                  "is_contract": true
                },
                "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
                "balances": [],
                "chain": "eip155:8453",
                "denylist_hits": [],
                "interfaces": {
                  "detail": "supportsInterface did not answer, so ERC-721 and ERC-1155 are reported as unknown rather than absent; ERC-20 is confirmed behaviourally from totalSupply, decimals, and balanceOf",
                  "erc1155": null,
                  "erc165": null,
                  "erc20": true,
                  "erc721": null
                },
                "proxy": {
                  "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
                  "admin": "0x4fc7850364958d97B4d3f5A08f79db2493f8cA44",
                  "beacon": null,
                  "detail": "resolved through the legacy zeppelinos slot; the EIP-1967 slot is empty on this contract, which is the case for Base USDC",
                  "implementation": "0x2Ce6311ddAE708829bc0784C967b7d77D19FD779",
                  "kind": "zeppelinos",
                  "slots_probed": [
                    {
                      "address": "0x2Ce6311ddAE708829bc0784C967b7d77D19FD779",
                      "label": "zeppelinos.implementation",
                      "slot": "0x7050c9e0f4ca769c69bd3a8ef740bc37934f8e2c036e5a723fd8ee048ed3f8c3",
                      "value": "0x0000000000000000000000002ce6311ddae708829bc0784c967b7d77d19fd779"
                    },
                    {
                      "address": "0x4fc7850364958d97B4d3f5A08f79db2493f8cA44",
                      "label": "zeppelinos.admin",
                      "slot": "0x10d6a54a4754c8869d6886b5f5d7fbfa5b4522237ea5c60d11bc4e7a1ff9390b",
                      "value": "0x0000000000000000000000004fc7850364958d97b4d3f5a08f79db2493f8ca44"
                    }
                  ],
                  "upgradeable": true
                },
                "rpc": {
                  "configured": true,
                  "endpoints": [],
                  "reachable": true
                },
                "token": {
                  "decimals": 6,
                  "detail": "symbol, decimals, and totalSupply read from the token",
                  "symbol": "USDC",
                  "total_supply": "4305008625389354"
                },
                "unresolved": [
                  "ERC-165 interface support: supportsInterface did not answer"
                ]
              },
              "risk_codes": [
                "PROXY_UPGRADEABLE"
              ],
              "verdict": "warn",
              "warnings": []
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "body": {
                  "$schema": "https://json-schema.org/draft/2020-12/schema",
                  "additionalProperties": false,
                  "properties": {
                    "address": {
                      "description": "The Base address to profile. Case-insensitive; normalised to EIP-55.",
                      "pattern": "^0x[0-9a-fA-F]{40}$",
                      "type": "string"
                    },
                    "selector": {
                      "description": "Only used for EIP-2535 diamonds, which have no single implementation and resolve their executing code per selector. Ignored for every other proxy kind.",
                      "pattern": "^0x[0-9a-fA-F]{8}$",
                      "type": "string"
                    },
                    "tokens": {
                      "description": "ERC-20 contracts to read balanceOf(address) on for the subject. Amounts come back in base units with the token's decimals, or null with a reason.",
                      "items": {
                        "pattern": "^0x[0-9a-fA-F]{40}$",
                        "type": "string"
                      },
                      "maxItems": 10,
                      "type": "array"
                    }
                  },
                  "required": [
                    "address"
                  ],
                  "title": "ChainStateRequest",
                  "type": "object"
                },
                "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": {
                    "result": {
                      "required": [
                        "address",
                        "account",
                        "proxy",
                        "interfaces",
                        "token",
                        "balances",
                        "unresolved"
                      ],
                      "type": "object"
                    },
                    "verdict": {
                      "description": "Precedence: block, then unknown, then warn, then allow.",
                      "enum": [
                        "allow",
                        "warn",
                        "block",
                        "unknown"
                      ],
                      "type": "string"
                    }
                  },
                  "required": [
                    "ok",
                    "verdict",
                    "risk_codes",
                    "evidence",
                    "result",
                    "request_hash"
                  ],
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    }
  },
  "liveness": {
    "reliability": null
  },
  "verified": false,
  "featured": false,
  "provider": {
    "host": "chainstate.schemasure.com",
    "manifest_name": "chainstate.schemasure.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": {
      "result": {},
      "verdict": "allow"
    },
    "type": "string"
  }
}