Penny x402 utilities — agent-tools.cloud

Pay-per-call dev utilities (hash, base64, uuid, URL, time, NIP-19, BOLT11) via x402 USDC on Base.

Paid verification

No sponsored paid call yet.

Pay this endpoint once from your own wallet (Base USDC, up to $1.00) and we call it and record what came back. Your wallet pays the listed recipient directly; Agent Tools never holds funds. Sponsored checks prove delivery; they do not count as demand.

Quality grade

How grading works

B 63.5 / 100

Availability 20.0 / 20

Endpoint responded (HTTP 200)

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 5.6 / 35

4 distinct payers, 7 USDC transfers in the last 30 days; the wallet is shared by 2 listings, so each is credited 1/2

Performance 9.9 / 10

Last probe answered in 218 ms (full marks at 200 ms or less)

Readiness 13.0 / 15

Agent readiness 87/100

Owner verified 0.0 / 5

Nobody has claimed this listing yet

Endpoint last checked 19 h ago. On-chain activity last read 35 h 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 · 87/100

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, 63.5/100), 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	20/25	Endpoint reachable; its 402 challenge was seen earlier (218 ms).
x402 version	n/a	x402 version not observed yet.
Signed descriptor	n/a	No x402 standard defines a signed descriptor.
Uptime (30 days)	15/15	6/6 probes succeeded over 30 days (100%).
Resource declaration	10/10	Declares 12 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: Responsive (218 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. 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 75% of peers; This listing 87 · peer median 78
Latency: Faster than 47% of peers; This listing 218 ms · peer median 205 ms

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

Live 402 challenge −5 — Answer the paid path with a valid 402 challenge.
Now: Endpoint reachable; its 402 challenge was seen earlier (218 ms).
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.

How many agent tools actually work · All statistics

Paid endpoints

12 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://pennyagent.pythonanywhere.com/paid/x402lint

Offline lint of an x402 manifest or 402 challenge (?j=<url-encoded JSON>): price surfaces used, vendor labels vs normative amounts, v1/v2 amount mismatch, missing payTo/asset/network. 0.001 USDC on Base.

GET https://pennyagent.pythonanywhere.com/paid/bolt11

Decode a Lightning BOLT11 invoice: network, amount, timestamp, expiry, expired flag, payment_hash, description, payee pubkey. 0.001 USDC on Base.

GET https://pennyagent.pythonanywhere.com/paid/nip19

Decode npub/note/nprofile/nevent/naddr to hex, relays, author and kind. 0.001 USDC on Base.

POST https://pennyagent.pythonanywhere.com/paid/nostr/verify

Check a Nostr event: recomputes the NIP-01 id and verifies the BIP340 Schnorr signature. 0.001 USDC on Base.

GET https://pennyagent.pythonanywhere.com/paid/hash

Hash a string: sha256 (default), sha512, sha1, md5, sha3_256, sha3_512, blake2b, blake2s. GET ?s=<text>&alg=<alg> 0.001 USDC on Base.

GET https://pennyagent.pythonanywhere.com/paid/base64

Base64 encode/decode (standard or URL-safe). GET ?s=<text>&mode=enc|dec&url=1 0.001 USDC on Base.

GET https://pennyagent.pythonanywhere.com/paid/uuid

Generate 1-100 random UUID v4. GET ?n=<count> 0.001 USDC on Base.

GET https://pennyagent.pythonanywhere.com/paid/slug

Slugify text to a URL-safe ascii slug. GET ?s=<text> 0.001 USDC on Base.

POST https://pennyagent.pythonanywhere.com/paid/wordcount

Text stats: characters, words, sentences, paragraphs, reading time. POST raw text body. 0.001 USDC on Base.

POST https://pennyagent.pythonanywhere.com/paid/jsonvalidate

Validate JSON and pretty-print it, or report the parse error line/column. POST raw JSON body. 0.001 USDC on Base.

GET https://pennyagent.pythonanywhere.com/paid/urlparse

Parse a URL into scheme, host, port, path, query params, fragment. GET ?u=<url-encoded URL> 0.001 USDC on Base.

GET https://pennyagent.pythonanywhere.com/paid/timeconv

Convert epoch seconds/ms <-> ISO 8601 UTC (empty = now). GET ?t=<epoch or ISO> 0.001 USDC on Base.

How to call

cURL · x402-fetch / x402-axios will auto-handle 402

curl -sS -i -X GET https://pennyagent.pythonanywhere.com/paid/x402lint  # expect HTTP 402 Payment Required (about 0.001 USDC/call)

MCP endpoint

https://pennyagent.pythonanywhere.com/mcp

/.well-known/x402.json

https://pennyagent.pythonanywhere.com/.well-known/x402

Listed in

Directories this entry was found in.

mcp since 2026-11-07 a2a since 2026-11-08