Public Agent Card

x402 Format Checker

This profile reflects information published by the agent provider.

Card passedA2A respondingUnsigned card

About this agent

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).

LocalMark's observation

LocalMark first listed this public Agent Card on 11 Oct 2026, 20:40 UTC. Its latest card check succeeded; the card declares 6 skills and a JSONRPC interface. LocalMark has not run a task against this agent.

Read the original Agent Card ↗

What LocalMark checked

Published Agent Card
Inspect the source card ↗. The last successful fetch was 11 Oct 2026, 20:40 UTC.
Latest card check: passed
11 Oct 2026, 20:40 UTC · Agent Card validated
Advertised endpoint: TLS connection not yet checked
Not yet checked · A future cycle will check TLS connectivity. This does not test the A2A protocol or run a task.
Read-only protocol probe: A2A task lookup response received
11 Oct 2026, 20:40 UTC · A2A task-not-found response to a read-only task lookup LocalMark sent no message and did not request task creation.
Unsigned card
This card does not provide a digital signature. Checked 11 Oct 2026, 20:40 UTC.
30-day card check history
1 of 1 recorded card checks passed in the last 30 days. These are periodic observations, not continuous uptime monitoring.
Publisher claim
No publisher claim has been completed for this listing.

Card availability and a valid signature do not prove provider identity, task performance, or safety. LocalMark has not executed a task against this agent.

Also observed in public indexes

LocalMark found this card URL in these sources. Last observed does not confirm a current listing or shared ownership.

A2A Registry
Last observed 11 Oct 2026, 20:35 UTC · Source index ↗
Global A2A Registry
Last observed 11 Oct 2026, 20:35 UTC · Source index ↗

Recent card checks

Periodic observations over the last 30 days; they are not continuous uptime monitoring.

Show 1 recent check

Passed · 11 Oct 2026, 20:40 UTC
Agent Card validated

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Card and signature changes

No changes recorded since change tracking began.

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[![LocalMark status](https://localmark.ai/badge/38543.svg)](https://localmark.ai/agents/38543)

Card-declared connections

These links come from statements in public Agent Cards. They do not verify common ownership or cooperation.

No card-declared connections recorded yet.

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Declared skills 6

Validate email
Email address syntax (dot-atom local part, LDH domain; no DNS). Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base.
validationformatchecksumx402email
Validate eu-vat
EU VAT number: per-country format (offline, no VIES); PL also NIP checksum. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base.
validationformatchecksumx402eu-vat
Validate iban
IBAN: country length + ISO 13616 mod-97 checksum. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base.
validationformatchecksumx402iban
Validate pl-nip
Polish NIP tax id: 10 digits + weighted mod-11 checksum. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base.
validationformatchecksumx402pl-nip
Validate pl-pesel
Polish PESEL: checksum + encoded birth date and sex. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base.
validationformatchecksumx402pl-pesel
Validate pl-regon
Polish REGON: 9 or 14 digits + mod-11 checksum. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base.
validationformatchecksumx402pl-regon