api.onesource.io
Look up the current owner of an ERC721 NFT by token_id via ownerOf (eth_call)
Go to this service →Our latest check (2026-10-11)
- Answering
- Yes — valid x402 payment terms
- Time to answer
- 374 ms
- Price
- $0.003 per call
- Paying buyers, last 30 days
- 157 (directory's own records)
- Paid calls, last 30 days
- 157
- Category
- Blockchain reads
- Address
- https://api.onesource.io/api/chain/nft-owner
Accuracy: paid answers checked against an independent record
Not yet in our paid checks. A seller we have not checked has neither passed nor failed.
For agents
This page as JSON: /sellers/c32146fcfc1d.json. Paid lookup by address: GET /api/seller?resource=… ($0.001, x402).