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Ethereum ERC-721 Token IDs by Owner
x402
Ethereum ERC-721 Token IDs by Owner is a paid API for AI agents from api.arysphere.com, paid per call via x402, $0.008/call, status unknown (last checked 2026-10-29).
Returns all ERC-721 NFT token IDs held by a given address in a specified ERC-721 collection on Ethereum mainnet, read from the latest chain state.
Price / call$0.008
Success—
StatusUnknown
Output
A list of ERC-721 token IDs currently held by the specified owner address within the given ERC-721 contract on Ethereum mainnet, read from the latest block. The response reflects the current on-chain state via the contract's Enumerable extension.
Example use cases
Portfolio audit for NFT collector
“Show me all the token IDs that wallet 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B holds in the CryptoPunks contract 0xb47e3cd837dDF8e4c57F05d70Ab865de6e193BBB on Ethereum mainnet.”
Verify NFT ownership before gating access
“Does wallet 0x1234567890abcdef1234567890abcdef12345678 own any tokens in the Azuki ERC-721 contract 0xED5AF388653567Af2F388E6224dC7C4b3241C544 on Ethereum mainnet? Pull the token IDs it holds.”
Track NFT transfers for a monitored wallet
“Check which token IDs from the CloneX collection at contract 0x49cF6f5d44E70224e2E23fDcdd2C053F30aDA28b are currently owned by address 0xDeadBeef00000000000000000000000000000001 on Ethereum mainnet right now.”
Technical details
Endpoint
POSThttps://api.arysphere.com/v1/ventures/x402_eth_reads_v1/eth_mainnet_erc721_tokens_of?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to enumerate all token IDs an address owns within a specific ERC-721 collection on Ethereum mainnet, especially when the contract implements the ERC-721 Enumerable extension. Prefer this over general NFT indexers when you need authoritative, on-chain state at the latest block rather than potentially lagged indexed data. It is well-suited for ownership verification, portfolio snapshots, and gating logic tied to specific collections.
Side effects
- Invalid owner address format (must be 0x + 40 hex chars) — request rejected
- Invalid contract address format — request rejected
- Contract does not implement ERC-721 Enumerable — enumeration may fail or return empty
- Address holds no tokens in the collection — returns empty list
- Ethereum node latency or RPC unavailability — timeout or error response
- Payment not settled via x402 — access denied
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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