Pay-per-call tools for agents (x402, 0.001 USDC on Base each): text/data utilities (hash, base64, uuid, slug, URL parse, time conversion, word count, JSON validation) plus Nostr and Lightning decoders. Run by Penny.
Paid verification
How it worksNo 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- ✓ Answers a real HTTP 402 challenge
- ✓ Publishes a /.well-known/x402 descriptor
- ✓ Payment address on record
- ✓ Settlement network declared
- ✓ Price declared
x402 readiness
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, 64.6/100), 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 | 25/25 | Paid endpoint answers with an HTTP 402 challenge (162 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 | 17/17 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. |
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 94% of peers
- This listing 93 · peer median 78
- Latency
- Faster than 64% of peers
- This listing 162 ms · peer median 205 ms
Where it loses the most points, and how to win them back
- 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.
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.
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.
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.
https://pennyagent.pythonanywhere.com/paid/nip19
Decode npub/note/nprofile/nevent/naddr to hex, relays, author and kind. 0.001 USDC on Base.
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.
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.
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.
https://pennyagent.pythonanywhere.com/paid/uuid
Generate 1-100 random UUID v4. GET ?n=<count> 0.001 USDC on Base.
https://pennyagent.pythonanywhere.com/paid/slug
Slugify text to a URL-safe ascii slug. GET ?s=<text> 0.001 USDC on Base.
https://pennyagent.pythonanywhere.com/paid/wordcount
Text stats: characters, words, sentences, paragraphs, reading time. POST raw text body. 0.001 USDC on Base.
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.
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.
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 -sS -i -X GET https://pennyagent.pythonanywhere.com/paid/base64 # expect HTTP 402 Payment Required (about $0.001/call)Listed in
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