Api Endpoint

base-contract

Contract introspection on Base mainnet - is it a contract, bytecode size, best-effort owner(), and whether it's a proxy.

Open interactive test console

Offering

Provider: x402.agentindex.world
Method: POST
Offering type: Api Endpoint
Transport type: http
Category: Blockchain And Crypto
Delivery: Not provided
Pricing model: Not provided
x402 version: 2

Endpoint context

URL: https://x402.agentindex.world/base/contract
MIME type: application/json
First seen: 2026-10-16T01:50:38.788Z
Last seen: 2026-11-02T09:07:50.844Z
Tags: base rpc, contract introspection, owner lookup, Base mainnet, smart contract info

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1: 0.005 USDC
Atomic price: 5000 · Network: eip155:8453 · Asset: USDC · Scheme: exact

Raw x402 terms

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5000",
    "payTo": "0xb3F32bdfe8D07825BC0D7387295aB1D7559BA69d"
  }
]

Observed health

Status: Reachable
Latest latency: 307 ms
Average latency: 698 ms
HTTP status: 405
Last checked: 2026-11-04T07:10:27.476Z
Reachability: 100% over 13 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "http"
    },
    "method": {
      "type": "string",
      "enum": [
        "POST",
        "PUT",
        "PATCH"
      ]
    },
    "bodyType": {
      "type": "string",
      "enum": [
        "json",
        "form-data",
        "text"
      ]
    },
    "body": {
      "properties": {
        "address": {
          "title": "Address",
          "type": "string"
        }
      },
      "required": [
        "address"
      ],
      "title": "AddressInput",
      "type": "object"
    }
  },
  "required": [
    "type",
    "method",
    "bodyType",
    "body"
  ],
  "additionalProperties": false
}

Output schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string"
    },
    "example": {
      "type": "object",
      "properties": {
        "address": {
          "title": "Address",
          "type": "string"
        },
        "is_contract": {
          "title": "Is Contract",
          "type": "boolean"
        },
        "bytecode_size": {
          "title": "Bytecode Size",
          "type": "integer"
        },
        "owner": {
          "anyOf": [
            {
              "type": "string"
            },
            {
              "type": "null"
            }
          ],
          "title": "Owner"
        },
        "is_proxy": {
          "title": "Is Proxy",
          "type": "boolean"
        }
      },
      "required": [
        "address",
        "is_contract",
        "bytecode_size",
        "owner",
        "is_proxy"
      ],
      "title": "ContractOutput"
    }
  },
  "required": [
    "type"
  ]
}