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NFT owner lookup (ERC-721 · agent402.tools

Who owns this NFT?

Who owns this NFT? Calls ownerOf(tokenId) on any ERC-721 contract on Ethereum, Base, Polygon, Arbitrum, or Optimism. Complements nft-holdings (which lists a WALLET's NFTs) - this answers by TOKEN. Keyless multi-endpoint failover.

Ready now4 calls · 3 buyers in 30 days

Input

ERC-721 contract address (0x…).
ethereum / base / polygon / arbitrum / optimism (default base).
Token id - decimal or 0x hex string.

Sample response

Published by the provider. Your run returns a fresh response.

response4 keys
contract"0x57f1…"
network"ethereum"
owner"0x…"
tokenId"0xaf2c…"
responseobject, 4 keys
Your agent can do this on its own
Add the MCP URL in Claude Code, Cursor or Codex. Your agent can run Tools within its spending limits, or ask for approval each time. Connect your agent

Connect your agent

Add one MCP URL and your agent can find and run this tool within its spending limits. Choose “Ask each time” if you want to approve every Call.

MCP URL

https://app.aecon.ai/mcp
Terminalbash
claude mcp add --transport http --scope user agentic-economy "https://app.aecon.ai/mcp"

In Claude Code, open /mcp, select agentic-economy, then choose Authenticate.

Track record

Paid calls, last 30 days
4
Buyers, last 30 days
3
Last paid call

Reported by the x402 directory.

A$0.0029 per call