Agent Card Validator (A2A)

agentcard.hergertsynthora.com

Paste an A2A Agent Card URL or inline JSON and this validator checks it against the A2A specification: required fields, skill schemas, endpoint reachability, security schemes and provider transparency. It returns a compatibility score, schema errors, warnings and an Ed25519-signed receipt, paid per call in USDC on Base.

Back to x402 service market

Validate an Agent Card against the A2A spec and return a compatibility score.

POST

https://agentcard.hergertsynthora.com/service

Example request body

Service information

Provider: agentcard.hergertsynthora.com
Category: AI
Uptime (30 days): 100%
Avg response time (30 days): 636 ms
Information updated: Sep 11, 2026

Transactions · 30 days

Volume: 0 USDC
Transactions: 0
Payer addresses: 0

Based on Base USDC records and updated hourly. This does not represent fulfilled sales.

Change history

Changes detected by automated probes across endpoints. Review receiving address changes before paying.

Receiving address
/service
Sep 3, 2026
Before
0x6d9f318463168ff637b50e5b9a21392e97c7c167
After
0xef879bfd6c4accb8f795136de90246e1ec245e06
Price
/service
Sep 3, 2026
Before
50000 0x833589fcd6edb6e08f4c7c32d4f71b54bda02913
After
10000 0x833589fcd6edb6e08f4c7c32d4f71b54bda02913
Receiving address
/service
Aug 25, 2026
Before
0x10800a5a5b9d72251566ec651e862a8b4b427de0
After
0x6d9f318463168ff637b50e5b9a21392e97c7c167

Service tags

validates

agent

card

given

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