Endpoint · onchainGETagent402.tools /api/erc721-owner ?contract=0x57f1887a8BF19b14fC0dF6Fd9B2acc9Af147eA85&network=ethereum&tokenId=0xaf2caa1c2ca1d027f1ac823b529d0a67cd144264b2789fa2ea4d63a67c7103cc
Who owns this NFT?
Read more
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.Overview
Grade?
UNRATED
0 of 30 paid calls toward a letter
Price
$0.002 per call
Paid calls
none yet
delivery unknown until someone pays
More info
Seller?
URL
https://agent402.tools/api/erc721-owner?contract=0x57f1887a8BF19b14fC0dF6Fd9B2acc9Af147eA85&network=ethereum&tokenId=0xaf2caa1c2ca1d027f1ac823b529d0a67cd144264b2789fa2ea4d63a67c7103cc
MCP server on this host: io.github.MikeyPetrillo/agent402
Seen
first 29 days ago · last 19 hr ago
54 free handshakes
Payment
Pays through
x402 · MPP evm, tempo
Offered on?
algorand:wGHE2Pwdvd7S12BL5FaOP20EGYesN73ktiC1qzkkit8=, eip155:10, eip155:1329, Polygon, eip155:143, Arbitrum, eip155:42220, Avalanche, Robinhood Chain, Base USDC, Solana, stellar:pubnet, Tempo USDC.e
Listed on?
Polygon, Arbitrum, Avalanche, Base, Solana
Score, from free handshakes onlyweights 2026.09.6
UN
RATED
RATED
0.811 liveness verified, no letter
To a letter · 30 paid calls
0 of 30
Held down by latency p95 · gap to 1.000 is 0.189: 0.084 uncertain ? + 0.105 short ? · 0.089 to A
| Component | Weight | Measured | Lower bound ? | Adds | Short ? | Uncertain ? | |
|---|---|---|---|---|---|---|---|
| latency p95costs the most it answered as fast as its class |
0.20 | 0.47 | 0.397 | 0.079 | −0.105 | −0.015 | |
| liveness it answered at all |
0.60 | 1.00 | 0.886 | 0.532 | 0 | −0.068 | |
| price stability the price stayed where it was listed |
0.20 | 1.00 | 1.000 | 0.200 | 0 | 0 | |
| Composite | 1.00 | 0.811 | gap to 1.000 = 0.189 · 0.105 short · 0.084 uncertain | 0.811 | −0.105 | −0.084 |
Not measured: correctness · nobody paid; honesty · nobody paid; schema conformance · no answer had a published shape to check
The multiplication, written out
0.200 × 0.397 latency p95
+ 0.600 × 0.886 liveness
+ 0.200 × 1.000 price stability
= 0.811 → UNRATED: 54 of 30 paid calls weights 2026.09.6 · 54 samples · seed cap_01M1RD9B26V659DBZDQK365AWC|2026-09-04T19:47:15.096Z|2026.09.6
Verify it yourself
npx teppi-check https://agent402.tools/api/erc721-owner?contract=0x57f1887a8BF19b14fC0dF6Fd9B2acc9Af147eA85&network=ethereum&tokenId=0xaf2caa1c2ca1d027f1ac823b529d0a67cd144264b2789fa2ea4d63a67c7103cccurl -s https://api.teppi.xyz/v1/trust/cap_01M1RD9B26V659DBZDQK365AWC