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x402-listing-doctor.x402-listing-doctor-workers.workers.dev

https://x402-listing-doctor.x402-listing-doctor-workers.workers.dev/v1/base-token-check
● healthy crypto
Category
crypto
Chains
base
Price
$0.0200 USDC / call

Quality grade

How grading works
B 55.1 / 100
Availability 20.0 / 20
Endpoint responded (HTTP 402)
Payability 15.0 / 15
  • ✓ Answers a real HTTP 402 challenge
  • ✓ Publishes a /.well-known/x402 descriptor
  • ✓ Payment address on record
  • ✓ Settlement network declared
  • ✓ Price declared
Demand 8.2 / 35
4 distinct payers, 8 USDC transfers in the last 30 days
Performance 0.0 / 10
Last probe answered in 3470 ms (full marks at 200 ms or less)
Readiness 11.9 / 15
Agent readiness 79/100
Owner verified 0.0 / 5
Nobody has claimed this listing yet
Endpoint last checked 18 h ago. On-chain activity last read 3 d ago. Availability and on-chain demand are both re-probed daily; the grade updates automatically on the next pass. This grade sets search order and leaderboards; the readiness score below is shown for reference only.

x402 readiness

B · 79/100

Readiness is how fully this listing follows its protocol and how it behaved in our probes over 30 days. It is shown for reference and does not move it in search. Search order and leaderboards use the separate quality grade (here B, 55.1/100), which weighs availability, payability and on-chain demand. How the two differ

Valid payment requirements 10/10 Payment requirements carry a payee, a mainnet network and a price.
Live 402 challenge 24/25 Paid endpoint answers with an HTTP 402 challenge (3470 ms); slow response -1.
x402 version n/a x402 version not observed yet.
Signed descriptor n/a No x402 standard defines a signed descriptor.
Uptime (30 days) 5.25/15 7/20 probes succeeded over 30 days (35%).
Resource declaration 10/10 Declares 6 paid resource(s).
Verified identity 5/10 Publisher descriptor (/.well-known/x402 or OpenAPI) on record; claim this listing to verify domain control.
Freshness + modern flags 5/5 seen in a source within 7 days; declares x402.
Security declaration n/a Payment is the access control for an x402 resource.
Applicable criteria total 75 points, scaled to 100.
Responsiveness: Slow (3470 ms; bands ≤2.5 s, ≤5 s, ≤8 s, slower; penalty only).
Payment evidence: x402_challenge — We sent a request and got a live HTTP 402 challenge. Also: x402_manifest, catalog_listing. Qualifies the payment claim; adds no points.
Measured 2026-11-11.
Nine criteria, the same as the A2A readiness score, read from our daily probe of the paid endpoint, its payment requirements and 30-day probe history. Signed descriptor and security declaration are n/a for x402 (payment is the access control), as is an x402 version we have not observed; the remaining points are scaled to 100. Grades: A>=90, B>=75, C>=60, D>=40, F<40. It also feeds 15 points of the x402 quality grade.

Compared with peers

Against 10,082 reachable x402 APIs in our daily snapshot (2026-11-12 06:46 UTC). Display only; it does not change search order.

Readiness
Higher than 53% of peers
This listing 79 · peer median 78
Latency
Faster than 4% of peers
This listing 3,470 ms · peer median 205 ms

Where it loses the most points, and how to win them back

  • Uptime (30 days) −9.8 — Stay reachable in our daily probes.
    Now: 7/20 probes succeeded over 30 days (35%).
  • Verified identity −5 — Claim the listing and prove control of its domain.
    Now: Publisher descriptor (/.well-known/x402 or OpenAPI) on record; claim this listing to verify domain control.
  • Live 402 challenge −1 — Answer the paid path with a valid 402 challenge.
    Now: Paid endpoint answers with an HTTP 402 challenge (3470 ms); slow response -1.

How many agent tools actually work · All statistics

Paid endpoints

6 resource(s) advertised by this origin. Each price below is that resource's own x402 price; the headline price is the range across them.

GET https://x402-listing-doctor.x402-listing-doctor-workers.workers.dev/v1/base-tx-explain

Explain one Base mainnet transaction from public RPC data: status, from/to, method selector, fee in ETH, block time and every ERC-20 Transfer with token, amount and decimals.

GET https://x402-listing-doctor.x402-listing-doctor-workers.workers.dev/v1/base-token-check

Read-only due-diligence for an ERC-20 on Base: name, symbol, decimals, total supply, owner(), contract code size, EIP-1967 proxy implementation and plain heuristics. No trading advice.

GET https://x402-listing-doctor.x402-listing-doctor-workers.workers.dev/v1/x402-listing-doctor

Compliance report for a public x402 endpoint before you list it: HTTP 402 status, PAYMENT-REQUIRED / v1 body fields (network, USDC asset, payTo, amount, timeout), Bazaar metadata presence and concrete fixes.

GET https://x402-listing-doctor.x402-listing-doctor-workers.workers.dev/v1/nonprofit-990

IRS Form 990 snapshot for one US nonprofit from ProPublica Nonprofit Explorer: name, city/state, NTEE code, and the last filings with tax period, total revenue, total expenses, total assets and the PDF link.

GET https://x402-listing-doctor.x402-listing-doctor-workers.workers.dev/v1/federal-register-search

Latest 20 Federal Register documents matching a term (optionally one agency): title, type (rule, proposed rule, notice), agencies, publication date, document number and official URL, newest first.

GET https://x402-listing-doctor.x402-listing-doctor-workers.workers.dev/v1/usgs-quakes-near

USGS earthquakes of magnitude 2.5+ within a radius of a point over the last N days: count, strongest event and the 20 most recent with magnitude, place, UTC time and USGS event page.

How to call

cURL · x402-fetch / x402-axios will auto-handle 402
curl -sS -i -X GET https://x402-listing-doctor.x402-listing-doctor-workers.workers.dev/v1/base-token-check  # expect HTTP 402 Payment Required (about 0.02 USDC/call)
/.well-known/x402.json
https://x402-listing-doctor.x402-listing-doctor-workers.workers.dev/.well-known/x402

Listed in

Directories this entry was found in.

x402scan since 2026-10-24