Index onlineMerchant portal
Api Endpoint

base-nft-owner

Who owns this NFT? ERC721 owner lookup on Base mainnet via ownerOf(tokenId).

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/nft-owner
MIME type
application/json
First seen
2026-10-16T01:50:45.949Z
Last seen
Tags
nft owner base, ownerOf, base rpc, erc721 owner, Base mainnet

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
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "3000",
    "payTo": "0xb3F32bdfe8D07825BC0D7387295aB1D7559BA69d"
  }
]

Observed health

Status
Reachable
Latest latency
315 ms
Average latency
915 ms
HTTP status
405
Last checked
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

{
  "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": {
        "token": {
          "title": "Token",
          "type": "string"
        },
        "token_id": {
          "minimum": 0,
          "title": "Token Id",
          "type": "integer"
        }
      },
      "required": [
        "token",
        "token_id"
      ],
      "title": "NftTokenInput",
      "type": "object"
    }
  },
  "required": [
    "type",
    "method",
    "bodyType",
    "body"
  ],
  "additionalProperties": false
}

Output schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string"
    },
    "example": {
      "type": "object",
      "properties": {
        "token": {
          "title": "Token",
          "type": "string"
        },
        "token_id": {
          "title": "Token Id",
          "type": "integer"
        },
        "owner": {
          "title": "Owner",
          "type": "string"
        }
      },
      "required": [
        "token",
        "token_id",
        "owner"
      ],
      "title": "NftOwnerOutput"
    }
  },
  "required": [
    "type"
  ]
}