# Saylor Innovations NFT Owner Lookup (ERC-721, Ethereum)

> Saylor Innovations NFT Owner Lookup (ERC-721, Ethereum) is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-03).

Returns the current owner address of a specific ERC-721 NFT token on Ethereum given a contract address and token ID

## Facts

- Endpoint: GET https://saylorinnovations.com/api/evm/ethereum/nft-owner/:address/1?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-03
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-nft-owner-lookup-erc-721-ethereum-eb688646
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dpzj8c1anNh-H7w4Swj7_

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability saylor-innovations-nft-owner-lookup-erc-721-ethereum-eb688646
```

Example prompt: Who currently owns token ID 1 of the ERC-721 NFT contract at 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D on Ethereum? Look it up on-chain and give me the owner's wallet address.

## When to prefer this

Use this endpoint when you need a direct on-chain lookup of who currently owns a specific ERC-721 NFT token on Ethereum. Prefer this over indexers or marketplaces when you need authoritative, real-time blockchain state rather than potentially stale cached data. Ideal for ownership verification, access gating, and provenance checks on Ethereum mainnet.

## Known failure modes

- Invalid contract address returns an error or null owner
- Token ID does not exist on the contract returns a not-found or zero-address response
- Contract address is not an ERC-721 contract returns an error
- Network congestion or node unavailability may cause timeouts
- Malformed address format returns a validation error

## How this service works

NFT Owner (ERC-721) (ethereum). NFT owner (ERC-721 ownerOf) for any collection on Base, Ethereum, Arbitrum, Optimism or Polygon.

## Output

Returns the current on-chain owner wallet address of the specified ERC-721 token on Ethereum, sourced directly from blockchain state. Includes the owner's Ethereum address for the given contract and token ID.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-nft-owner-lookup-erc-721-ethereum-eb688646/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)