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ERC-721 Token Lookup by Owner
x402
ERC-721 Token Lookup by Owner is a paid API for AI agents from anibalb.duckdns.org, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).
Returns all ERC-721 NFT tokens held by a given wallet address on a specified contract, including token IDs and URIs.
Price / call$0.002
Success—
StatusUnknown
How this service works
Public data and utility APIs paid per call in USDC on Base (x402). No accounts, no API keys. 174 routes: crypto/equity data, onchain reads, DNS/email/security intel, geo/weather, x402 payment diagnostics, dev utilities and more.
Output
A JSON object containing the owner address, a count of tokens held, and an array of token objects each with a token_id and token_uri (e.g. an IPFS link to metadata).
Example use cases
NFT portfolio audit for a wallet
“Show me all the ERC-721 tokens held by wallet 0x1234...abcd — I want the token IDs and their metadata URIs so I can audit the collection.”
Verify NFT ownership before granting access
“Check whether wallet 0xDead...Beef holds any tokens from contract 0xBC4C...A1B2 — I need to verify they actually own an NFT before I let them into the members area.”
Inventory an NFT collection for resale
“List every ERC-721 token owned by 0x9999...FFFF on the CryptoPunks contract, with their token IDs and URIs, so I can prep a resale inventory.”
Technical details
Endpoint
GEThttps://anibalb.duckdns.org/x402/erc721-tokens?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, no-account onchain lookup of ERC-721 token holdings for a specific wallet, especially in a pay-per-call context where you don't want to maintain API keys or subscriptions. Prefer it over indexers like Alchemy/Moralis NFT APIs when minimizing setup overhead and paying micro-amounts per call via x402 USDC is acceptable. Best for spot checks, ownership verification, or lightweight NFT portfolio reads.
Side effects
- Invalid or checksumless wallet address returns an error or empty result
- Contract address not an ERC-721 contract returns empty or error
- Rate limiting or payment failure (x402 USDC payment not accepted) returns 402
- Network/RPC timeout if the blockchain node is unreachable
- Wallet holds zero tokens — returns count:0 and empty tokens array
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"count": 2,
"owner": "0x...",
"tokens": [
{
"token_id": "1",
"token_uri": "ipfs://..."
}
]
}
}Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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