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Api Endpoint

Overwing Preflight for x402

Overwing Preflight for x402: should an agent sign this payment? POST the PAYMENT-REQUIRED terms and your policy; get allow, review or refuse with reasons: terms vs policy, payee vs the x402 directory and the server's own manifest, price vs the record. $0.002 USDC, no account.

Open interactive test console

Offering

Provider
overwing.ai
Method
GET
Offering type
Api Endpoint
Transport type
http
Category
Security
Delivery
Not provided
Pricing model
Not provided
x402 version
2

Endpoint context

URL
https://overwing.ai/api/x402/preflight/x402
MIME type
application/json
First seen
2026-10-16T02:18:54.687Z
Last seen
Tags
X402, Payments, Agents, Wallet, Security, policy, preflight, guardrails

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1
0.002 USDC
Atomic price: 2000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "2000",
    "payTo": "0xF4A6CEa7CE19CE36D6420905E5a1EAFb30Bfd133"
  }
]

Observed health

Status
Healthy
Latest latency
102 ms
Average latency
580 ms
HTTP status
402
Last checked
Reachability
100% over 14 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "http"
    },
    "method": {
      "type": "string",
      "enum": [
        "GET"
      ]
    },
    "bodyType": {
      "type": "string",
      "enum": [
        "json",
        "form-data",
        "text"
      ]
    },
    "body": {
      "type": "object",
      "required": [
        "payment_required"
      ],
      "properties": {
        "payment_required": {
          "description": "The PAYMENT-REQUIRED header value (base64 JSON) or the decoded x402 v2 object {x402Version, resource, accepts[]}"
        },
        "requested_url": {
          "type": "string",
          "description": "The URL the agent asked for; checked against the resource in the terms"
        },
        "network": {
          "type": "string",
          "description": "The CAIP-2 network the agent would pay on, when the terms offer several"
        },
        "policy": {
          "type": "object",
          "description": "max_per_call_usd (default 0.05), new_payee_max_usd (0.01), allowed_networks, allowed_payees, blocked_payees, allow_testnets (false), max_price_drift (0.25)"
        },
        "fresh_quote": {
          "type": "boolean",
          "description": "Also fetch the resource unpaid and compare its quote with the terms given"
        }
      }
    }
  },
  "required": [
    "type",
    "method",
    "bodyType",
    "body"
  ],
  "additionalProperties": false
}

Output schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string"
    },
    "example": {
      "type": "object",
      "properties": {
        "decision": {
          "type": "string",
          "enum": [
            "allow",
            "review",
            "refuse"
          ]
        },
        "reasons": {
          "type": "array"
        },
        "terms": {
          "type": "object"
        },
        "payee": {
          "type": "object"
        },
        "price": {
          "type": "object"
        },
        "policy": {
          "type": "object"
        },
        "checked_at": {
          "type": "string"
        },
        "valid_for_seconds": {
          "type": "integer"
        }
      }
    }
  },
  "required": [
    "type"
  ]
}