Who owns this NFT?
Who owns this NFT? Current owner of an ERC-721 token on Base by contract address and token id (ownerOf)
Answeringour last check, 2026-10-10
1 of 1checks answered this week
241 msmedian answer time
$0.002listed price per call
$0.002price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://aether-x402.vercel.app/v1/base/nft-owner
| Category | Market data |
|---|---|
| Provider host | aether-x402.vercel.app |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 4 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-10 | valid payment request | 402 | $0.002 | 241 ms |
Example input (from the provider)
{
"body": {
"contract": "0x03c4738Ee98aE44591e1A4A4F3CaB6641d95DD9a",
"tokenId": "20339294690710288616623341905746354430592698944139542544116293784975432873833"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"contract": {
"pattern": "^0x[0-9a-fA-F]{40}$",
"type": "string"
},
"tokenId": {
"pattern": "^[0-9]+$",
"type": [
"string",
"integer"
]
}
},
"required": [
"contract",
"tokenId"
],
"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": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}