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OnchainExpat NFT Metadata API
x402
OnchainExpat NFT Metadata API is a paid API for AI agents from x402.onchainexpat.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-13).
Fetches on-chain NFT metadata for a given token using the x402 pay-per-request protocol
Price / call$0.02
Success—
StatusUnknown
How this service works
Pay-per-request AI, crypto, proxy, and utility APIs using x402 protocol
Output
A JSON object containing the NFT's metadata including name, description, image URL, external URL, and an array of trait attributes (e.g. background, eyes, fur) for the specified token.
Example use cases
Example prompt
“Can you look up the metadata for NFT token ID 1234 on the Bored Ape Yacht Club contract 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D on Ethereum — I want to see its name, image, and trait attributes.”
Technical details
Endpoint
POSThttps://x402.onchainexpat.com/api/x402-crypto/nft-metadataWhen to prefer
Use this endpoint when you need on-chain NFT metadata (name, image, traits) for a specific token by contract address and token ID, especially in a pay-per-request context without needing a monthly subscription to a larger NFT data platform like OpenSea or Alchemy.
Side effects
- Invalid or non-existent contract address returns an error
- Token ID not found on the given contract returns a 404-style error
- Unsupported blockchain network returns an error
- Payment not included or insufficient USDC balance returns a 402 payment required response
- Rate limiting or network congestion may cause timeouts
Input
{
"token_id": "1",
"contract_address": "0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string | Blockchain (default: ethereum) |
| token_idrequired | string | Token ID of the NFT (numeric string) |
| contract_addressrequired | string | NFT contract address (0x + 40 hex chars) |
Output
{
"data": {
"chain": "ethereum",
"rarity": {
"note": "Full rarity score requires collection-wide data. This shows trait overview only.",
"trait_count": 5,
"trait_types": [
"Mouth",
"Clothes",
"Background",
"Eyes",
"Fur"
]
},
"metadata": {
"name": "Token #1",
"image": "https://ipfs.io/ipfs/QmPbxeGcXhYQQNgsC6a36dDyYUcHgMLnGKnF8pVFmGsvqi",
"attributes": [
{
"value": "Grin",
"trait_type": "Mouth"
},
{
"value": "Vietnam Jacket",
"trait_type": "Clothes"
},
{
"value": "Orange",
"trait_type": "Background"
},
{
"value": "Blue Beams",
"trait_type": "Eyes"
},
{
"value": "Robot",
"trait_type": "Fur"
}
],
"description": null,
"external_url": null,
"animation_url": null
},
"token_id": "1",
"ownership": {
"current_owner": "0x46efbaedc92067e6d60e84ed6395099723252496",
"last_transfer": null,
"first_transfer": null,
"transfer_count": 0
},
"transfers": [],
"chain_name": "Ethereum",
"collection": {
"name": "Bored Ape Yacht Club",
"type": "pfp",
"verified": true
},
"contract_address": "0xbc4ca0eda7647a8ab7c2061c2e118a18a936f13d"
},
"cached": false,
"success": true,
"timestamp": "2026-06-18T05:55:02.560886+00:00"
}Schema · Response
| Field | Type | Description |
|---|---|---|
| data | object | |
| success | boolean |
Tags
x402
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