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.
Answeringour last check, 2026-10-18
1 of 1checks answered this week
1798 msmedian answer time
$0.002listed price per call
$0.002price it asked us
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://overwing.ai/api/x402/preflight/x402
| Category | Market data |
|---|---|
| Provider host | overwing.ai |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-18 | valid payment request | 402 | $0.002 | 1798 ms |
Example input (from the provider)
{
"body": {
"payment_required": "<the PAYMENT-REQUIRED header value, or its decoded JSON>",
"policy": {
"allow_testnets": false,
"max_per_call_usd": 0.05,
"new_payee_max_usd": 0.01
},
"requested_url": "https://example.com/api/thing"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"fresh_quote": {
"description": "Also fetch the resource unpaid and compare its quote with the terms given",
"type": "boolean"
},
"network": {
"description": "The CAIP-2 network the agent would pay on, when the terms offer several",
"type": "string"
},
"payment_required": {
"description": "The PAYMENT-REQUIRED header value (base64 JSON) or the decoded x402 v2 object {x402Version, resource, accepts[]}"
},
"policy": {
"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)",
"type": "object"
},
"requested_url": {
"description": "The URL the agent asked for; checked against the resource in the terms",
"type": "string"
}
},
"required": [
"payment_required"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"checked_at": {
"type": "string"
},
"decision": {
"enum": [
"allow",
"review",
"refuse"
],
"type": "string"
},
"payee": {
"type": "object"
},
"policy": {
"type": "object"
},
"price": {
"type": "object"
},
"reasons": {
"type": "array"
},
"terms": {
"type": "object"
},
"valid_for_seconds": {
"type": "integer"
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}