● healthy
tools-utilities
Service-quality oracle for x402: pays real USDC to probe machine-payable services on a schedule and scores what actually comes back — payment settlement, schema conformance, ground-truth accuracy, LLM-judged quality (composite 0-100, tiers gold/ok/avoid). Every rating carries on-chain receipts; daily evidence digests are Bitcoin-anchored via OpenTimestamps so history can't be quietly rewritten. Free tier verdicts at `/tier/{url}`, paid full reports ($0.005 USDC on Base), listed in the CDP Bazaar. ([GitHub](https://github.com/JasonCZMeng/assay)) ([Leaderboard](https://assay.nominal-labs.com/leaderboard)) ([SKILL.md](https://assay.nominal-labs.com/SKILL.md))
Category
tools-utilities
Chains
—
Price
—
Quality grade
How grading works
C+
55.9 / 100
Availability
40.0 / 40
Endpoint responded (HTTP 200)
Payability
10.0 / 20
- ✗ Answers a real HTTP 402 challenge
- ✓ Publishes a /.well-known/x402 descriptor
- ✓ Payment address on record
- ✓ Settlement network declared
- ✓ Price declared
Demand
5.9 / 40
1 distinct payers, 8 USDC transfers in the last 30 days
Owner verified
0.0 / 3
Nobody has claimed this listing yet
Endpoint last checked 8 h ago.
On-chain activity last read 11 d ago.
Availability and on-chain demand are both re-probed daily; the grade
updates automatically on the next pass.
How to call
cURL · x402-fetch / x402-axios will auto-handle 402
curl -sS -i -X GET https://assay.nominal-labs.com # expect HTTP 402 Payment Required (price advertised in the 402 response)/.well-known/x402.json
https://assay.nominal-labs.com/.well-known/x402
Listed in
Directories this entry was found in.
cdp-bazaar
awesome-x402