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SCVD Signature Agent Card
x402
SCVD Signature Agent Card is a paid API for AI agents from scvd.store, paid per call via x402, $0.99/call, status unknown (last checked 2026-10-25).
Performs a one-shot directory battery check on a public HTTP-message-signatures key directory and returns a signed JSON verdict card with all check results, evidence hash, and a permanent card URL.
Price / call$0.99
Success—
StatusUnknown
How this service works
The Calling Card. REQUIRES ?url= on the paid request — a signed request without it is refused before the gate and no money moves. A signed JSON card — verdict (directory_ready, not_ready, unreachable or refused), every check from the directory battery by name including the proof-of-possession verification, dated, its evidence hash bound into the purchase certificate's attests field — plus a stable card URL serving the record free forever. Instant; one GET at one moment, neve…
Output
A signed JSON calling card containing: the overall verdict (directory_ready, not_ready, unreachable, or refused), every named check from the directory battery including proof-of-possession, the check date, an evidence hash bound into the purchase certificate's attests field, a stable card URL serving the record for free permanently, a certificate with cert_id and patron number, an ed25519 signature with a verify URL, and a badge SVG URL.
Example use cases
Agent directory readiness certification
“Check whether my agent's signing key directory at https://agent.acme.com is ready — run the full SCVD battery and give me a signed calling card I can share, with the name 'Acme Agent' on the certificate.”
Pre-launch compliance audit
“Before we go live, verify that https://staging.mybot.io passes the HTTP message signatures directory checks and hand me a signed verdict card so I have a dated record of the result.”
Third-party proof-of-possession receipt
“I need an independent signed certificate proving that https://payments.myservice.net passed proof-of-possession verification — can you grab a calling card from SCVD with the agent name 'PayService'?”
Technical details
Endpoint
GEThttps://scvd.store/api/buy/signature_agent_card?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a signed, timestamped, third-party verdict on whether an agent's HTTP message signatures key directory is correctly configured and passes proof-of-possession — especially when you need a permanent, shareable certificate with an evidence hash rather than a transient check result. Prefer it over self-checks or informal audits when you need an independently signed record for compliance, audit trails, or credential sharing.
Side effects
- URL points to scvd.store itself — refused by policy
- Target origin is not reachable on the public internet — verdict: unreachable
- Directory URL returns a malformed or non-compliant response — verdict: not_ready
- Missing required 'url' query parameter — request rejected
- URL is not HTTPS or uses a non-default port — may be rejected or flagged
- Payment of $2 USDC via x402 fails — no card issued
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"item_id": "signature_agent_card",
"message": "Pleasure doing business. Here's your goods, warm off the shelf.",
"tip_usdc": 0,
"badge_url": "https://scvd.store/badges/41.svg",
"paid_usdc": 0.99,
"signature": "<128 hex chars, ed25519>",
"verify_url": "https://scvd.store/api/verify/<your cert_id>",
"certificate": {
"date": "2026-07-22T15:04:05.000Z",
"item": "signature_agent_card",
"cert_id": "<cert_ + 12 chars, minted when this purchase settles>",
"patron_number": 41
},
"deliverable": "<the The Calling Card itself, as text>",
"patron_number": 41
}
}Tags
x402
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