Api Endpoint

api.onesource.io

Look up the current owner of an ERC721 NFT by token_id via ownerOf (eth_call)

Open interactive test console

Offering

Provider: api.onesource.io
Method: GET
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://api.onesource.io/api/chain/nft-owner
MIME type: application/json
First seen: 2026-10-16T01:50:06.715Z
Last seen: 2026-11-04T04:44:56.099Z
Tags: None supplied

Website

Payment pricing

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

Payment option 1: 0.003 USDC
Atomic price: 3000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Payment option 2: 0.003 USDC
Atomic price: 3000 · Network: eip155:8453 · Asset: USDC · Scheme: batch-settlement

Raw x402 terms

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "3000",
    "payTo": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea"
  },
  {
    "scheme": "batch-settlement",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "3000",
    "payTo": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea"
  }
]

Observed health

Status: Healthy
Latest latency: 66 ms
Average latency: 57 ms
HTTP status: 402
Last checked: 2026-11-04T04:44:56.094Z
Reachability: 100% over 14 checks

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

Input schema

{
  "additionalProperties": false,
  "properties": {
    "method": {
      "enum": [
        "GET",
        "HEAD",
        "DELETE"
      ],
      "type": "string"
    },
    "queryParams": {
      "properties": {
        "contract": {
          "pattern": "^0x[a-fA-F0-9]{40}$",
          "type": "string"
        },
        "network": {
          "default": "ethereum",
          "enum": [
            "ethereum",
            "sepolia",
            "robinhood"
          ],
          "type": "string"
        },
        "token_id": {
          "pattern": "^[0-9]+$",
          "type": "string"
        }
      },
      "required": [
        "contract",
        "token_id"
      ],
      "type": "object"
    },
    "type": {
      "const": "http",
      "type": "string"
    }
  },
  "required": [
    "type",
    "method"
  ],
  "type": "object"
}

Output schema

{
  "properties": {
    "example": {
      "properties": {
        "data": {
          "description": "Endpoint-specific response payload",
          "properties": {
            "contract_address": {
              "type": "string"
            },
            "owner": {
              "type": "string"
            },
            "token_id": {
              "type": "string"
            }
          },
          "type": "object"
        },
        "error": {
          "properties": {
            "code": {
              "type": "integer"
            },
            "message": {
              "type": "string"
            }
          },
          "type": [
            "object",
            "null"
          ]
        },
        "meta": {
          "properties": {
            "cost_usdc": {
              "type": "string"
            },
            "endpoint": {
              "type": "string"
            },
            "payment_chain": {
              "type": "string"
            },
            "payment_token": {
              "type": "string"
            },
            "request_id": {
              "type": "string"
            }
          },
          "required": [
            "endpoint",
            "request_id"
          ],
          "type": "object"
        }
      },
      "required": [
        "data",
        "meta"
      ],
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}