Endpoint · onchainGETapi.arysphere.com /v1/ventures/x402_chain_reads_v1/base_erc721_ownerof ?id=5256424&token=0xa990c6a764b73bf43cee5bb40339c3322fb9d55f
Base NFT (ERC-721) owner of a token id.
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Base NFT (ERC-721) owner of a token id. NFT owner read on Base: takes token (ERC-721 contract, 0x + 40 hex) and id (decimal token id) and returns the address that ownerOf(id) reports on the contract.Overview
Grade?
UNRATED
0 of 30 paid calls toward a letter
Price
$0.003 per call
Paid calls
none yet
delivery unknown until someone pays
More info
Seller?
URL
https://api.arysphere.com/v1/ventures/x402_chain_reads_v1/base_erc721_ownerof?id=5256424&token=0xa990c6a764b73bf43cee5bb40339c3322fb9d55f
MCP server on this host: com.arysphere/arysphere-x402
Seen
first 6 days ago · last 14 hr ago
6 free handshakes
Payment
Pays through
x402
Offered on?
Polygon, Arbitrum, Base USDC
Listed on?
Polygon, Arbitrum, Base
Score, from free handshakes onlyweights 2026.09.6
UN
RATED
RATED
0.326 liveness verified, no letter
To a letter · 30 paid calls
0 of 30
Held back by sample size, not by the seller · gap to 1.000 is 0.674: 0.600 uncertain ? + 0.074 short ? · 0.124 to D
| Component | Weight | Measured | Lower bound ? | Adds | Short ? | Uncertain ? | |
|---|---|---|---|---|---|---|---|
| livenesscosts the most it answered at all |
0.60 | 1.00 | 0.000 | 0.000 | 0 | −0.600 | |
| latency p95 it answered as fast as its class |
0.20 | 0.63 | 0.629 | 0.126 | −0.074 | 0 | |
| price stability the price stayed where it was listed |
0.20 | 1.00 | 1.000 | 0.200 | 0 | 0 | |
| Composite | 1.00 | 0.326 | gap to 1.000 = 0.674 · 0.074 short · 0.600 uncertain | 0.326 | −0.074 | −0.600 |
Not measured: correctness · nobody paid; honesty · nobody paid; schema conformance · no answer had a published shape to check
The multiplication, written out
0.600 × 0.000 liveness
+ 0.200 × 0.629 latency p95
+ 0.200 × 1.000 price stability
= 0.326 → UNRATED: 5 of 30 paid calls weights 2026.09.6 · 5 samples · seed cap_01M546CNG7N585XFNQBGCNBESF|2026-09-21T19:58:40.161Z|2026.09.6
Verify it yourself
npx teppi-check https://api.arysphere.com/v1/ventures/x402_chain_reads_v1/base_erc721_ownerof?id=5256424&token=0xa990c6a764b73bf43cee5bb40339c3322fb9d55fcurl -s https://api.teppi.xyz/v1/trust/cap_01M546CNG7N585XFNQBGCNBESF