{
  "schema": "voidly-pay-probe-attest-info/v1",
  "name": "Voidly Probe Attestation",
  "description": "Pay 0.5¢ (5,000 micro-credits) to receive a Voidly-signed attestation that a URL was reachable from N of M Voidly probes at timestamp T. Useful for verifiable evidence in agent workflows: fact-checking, audit trails, anti-hallucination proofs, news verification.",
  "what_you_are_paying_for": "The Ed25519 attestation, not the data.",
  "free_equivalent": {
    "url": "https://api.voidly.ai/v1/probe/domain/{domain}",
    "description": "The identical measurements, unsigned, free and unmetered. This is the only upstream this endpoint reads."
  },
  "endpoint": "https://api.voidly.ai/v1/pay/probe-attest",
  "method": "GET",
  "query_params": {
    "domain": "Required. Hostname to attest (e.g. twitter.com).",
    "quote_id": "Optional on second call. The quote_id returned by the 402 challenge."
  },
  "pricing": {
    "amount_micro": 5000,
    "amount_usdc": 0.005,
    "currency": "voidly-credit",
    "recipient_did": "did:voidly:PBcsB2avN4ZfDC5yvEwBBT"
  },
  "flow": [
    "GET /v1/pay/probe-attest?domain=twitter.com → HTTP 402 + quote_id",
    "Pay the quote via /v1/pay/x402/verify or any x402 client",
    "GET /v1/pay/probe-attest?domain=twitter.com&quote_id=<id> → 200 + signed attestation"
  ],
  "schema_url": "https://api.voidly.ai/.well-known/voidly-probe-attest.json",
  "facilitator_key_url": "https://api.voidly.ai/v1/pay/x402/facilitator-key",
  "probe_network": {
    "inventory_url": "https://api.voidly.ai/v1/probe/network",
    "note": "Live node count, per-country coverage and last-seen timestamps. Fleet size changes; do not cache these numbers.",
    "refresh_minutes": 5
  },
  "$why_unique": "The attestation is an Ed25519 signature over multi-vantage reachability data, verifiable by anyone holding the published facilitator key without trusting the party presenting it.",
  "honest_caveat": "Coverage is limited to the countries the fleet actually reaches (see inventory_url). An attestation says a host was reachable from the probes that reported, not that it is reachable everywhere — and absence of a probe in a country is not evidence about that country."
}