overwing.ai

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "how": "POST the same body as https://overwing.ai/api/v1/preflight/x402 with no key. The first response is 402 with x402 v2 payment requirements; sign them and resend with the PAYMENT-SIGNATURE header. Settlement happens only after a check was made.",
  "not": "Not a simulation and not a guarantee. It says whether the terms and the payee look like what they claim; it cannot see what the service will deliver.",
  "data": "Data: x402-list.com (CC BY 4.0); Overwing Atlas. The directory copy is refreshed nightly; a service's endpoints are fetched when first needed and kept for a day.",
  "free": "10 checks a day with no key; with a key, each check counts as one evaluation. Also the preflight_payment tool on the MCP server, the x402 preflight hook in the OpenClaw plugin, and the overwing-x402-preflight npm package (attachPreflight on any @x402 client).",
  "name": "Overwing Preflight for x402",
  "paid": "POST https://overwing.ai/api/x402/preflight/x402 with the same body: $0.002 USDC over x402, no key and no daily limit. A check that cannot be made is not settled.",
  "what": "Should an agent sign this x402 payment? Reads the terms in a 402 (network, asset, amount, payee, timeout, resource) and answers allow, review or refuse with reasons: the terms against your policy, the payee against x402-list's directory (verified delivery, settlements, buyers, shared payout addresses) and the server's own manifest, and the price against what is recorded for that endpoint.",
  "asset": "USDC",
  "answer": "decision (allow | review | refuse), reasons[{code, detail}], terms, payee, price, policy, checked_at, valid_for_seconds",
  "method": "POST",
  "pay_to": "0xF4A6CEa7CE19CE36D6420905E5a1EAFb30Bfd133",
  "network": "base",
  "version": 2,
  "endpoint": "/api/x402/preflight/x402",
  "protocol": "x402",
  "try_free": "POST https://overwing.ai/api/v1/preflight/x402 with the same body and no key: 10 checks a day.",
  "price_usd": 0.002,
  "solana_transactions": "https://overwing.ai/api/v1/preflight"
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xF4A6CEa7CE19CE36D6420905E5a1EAFb30Bfd133",
    "scheme": "exact",
    "network": "eip155:8453",
    "mimeType": "application/json",
    "resource": "https://overwing.ai/api/x402/preflight/x402",
    "description": "",
    "maxAmountRequired": "2000",
    "maxTimeoutSeconds": 60
  }
]

Provenance

Seen in the source catalog

2026-10-13 23:38Z

Last indexed by Roundhouse

2026-10-25 20:16Z

Last enriched (probe, favicon, geo)

2026-10-14 14:46Z

x402 version

1

Max timeout

60s

Liveness probe

HTTP 402