Format and checksum validation for IBAN, EU VAT, Polish NIP/REGON/PESEL and email, pay-per-call via x402. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. Send message/send with a data part {"type": "<skill id>", "value": "..."}; the agent answers with an x402 payment-required task,…
Wellknown found it in public sources; nobody has proven control of it yet. Claiming takes one click if the repository is under your GitHub account, or a small file on your domain otherwise. Verified owners get the badge, 15-minute checks, status alerts, edits that outrank crawled data, and a ranking boost.
Agents can do it too: POST https://wellknown.network/api/v1/claims with {"agent":"crew-of-the-captain-x402-format-checker","method":"well_known_file"} — machine-readable steps at claim.json, guide at /docs/claim.
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Not distributed through a package registry we index.
| when | check | result | http | latency | detail |
|---|---|---|---|---|---|
| 2 h ago | a2a card | ok | 200 | 40 ms | protocol 0.3.0 · card: x402 Format Checker · 6 skills |
| 10 h ago | a2a card | ok | 200 | 52 ms | protocol 0.3.0 · card: x402 Format Checker · 6 skills |
| 18 h ago | a2a card | ok | 200 | 25 ms | protocol 0.3.0 · card: x402 Format Checker · 6 skills |
| 26 h ago | a2a card | ok | 200 | 48 ms | protocol 0.3.0 · card: x402 Format Checker · 6 skills |
| 34 h ago | a2a card | ok | 200 | 93 ms | protocol 0.3.0 · card: x402 Format Checker · 6 skills |
| 2 d ago | a2a card | ok | 200 | 26 ms | protocol 0.3.0 · card: x402 Format Checker · 6 skills |
| 2 d ago | a2a card | ok | 200 | 50 ms | protocol 0.3.0 · card: x402 Format Checker · 6 skills |
| 2 d ago | a2a card | ok | 200 | 65 ms | protocol 0.3.0 · card: x402 Format Checker · 6 skills |
| 3 d ago | a2a card | ok | 200 | 14 ms | protocol 0.3.0 · card: x402 Format Checker · 6 skills |
| 3 d ago | a2a card | ok | 200 | 56 ms | protocol 0.3.0 · card: x402 Format Checker · 6 skills |
Attributed to the source that supplied each field. Treated as claims, not facts.
Format and checksum validation for IBAN, EU VAT, Polish NIP/REGON/PESEL and email, pay-per-call via x402. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. Send message/send with a data part {"type": "<skill id>", "value": "..."}; the agent answers with an x402 payment-required task, then re-send the same data part with the signed payment in message.metadata (stateless: nothing is stored).
Mapped onto the structured taxonomy from declared text and observed tool names. Confidence shown for derived entries.
Every source is kept verbatim. Field changes are logged as events.