Verify an A2A agent card before trusting or routing to it
Verify an A2A agent card before trusting or routing to it: dual-probe /.well-known/agent-card.json and agent.json, check MUST fields (name/description/url/version/capabilities), classify protocolVersion, flag the known 0.3<->1.0 silent schema breaks, verify any JWS signature over RFC 8785 JCS canonical bytes (did:web key resolution), and live-probe the advertised interface with tasks/send. Per-step verdict + remediation.
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://agents.daedalusdevelopmentgroup.com/v1/a2a/verify-card
| Category | Everything else |
|---|---|
| Provider host | agents.daedalusdevelopmentgroup.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
We never call tools that send, buy, move money or file anything, not even without paying.
Example input (from the provider)
{
"body": {
"card": {},
"url": "https://example.com"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": true,
"properties": {
"body": {
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"additionalProperties": true,
"properties": {
"example": {
"ok": true
},
"type": {
"type": "string"
}
},
"required": [
"type",
"example"
],
"type": "object"
}
},
"required": [
"input",
"output"
],
"type": "object"
}