x402 Endpoint Preflight
Pre-action x402 payment checks and deterministic email HTML validation for AI agents.
MediaLiveeip155:8453Exactvia cdp
x402Payment-preflightPre-action-checkAgent-procurementAgent-safety
Calls · 30d
1→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 17 snapshots so far.
$0.006
Verified settled volume
2 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0030
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-08-30 15:13Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x8331051Bb822536d5e228433e7A5486f7169064DThe wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.003USDC≈ $0.003 USD
on Base · exact scheme
Pay 0.003 USDC on Base to 0x8331…9064D. The signed payment is good for 5 minutes.
- Paid to
- 0x8331…9064D
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 3000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x8331051Bb822536d5e228433e7A5486f7169064D",
"amount": "3000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"url": "https://merchant.example/api/paid-resource",
"method": "POST",
"expected": {
"network": "eip155:8453",
"maxAmountUsd": 0.01
}
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"ok": true,
"probe": {
"status": "completed",
"httpStatus": 402,
"responseBodyRead": false,
"redirectsFollowed": 0
},
"target": {
"url": "https://merchant.example/api/paid-resource",
"method": "POST"
},
"privacy": {
"retained": false,
"rawResponseReturned": false,
"credentialsForwarded": false
},
"service": "x402-endpoint-preflight",
"summary": {
"compatible": true,
"acceptsCount": 1,
"findingCounts": {
"info": 0,
"error": 0,
"warning": 0
}
},
"version": "2026-07-31",
"findings": [],
"challenge": {
"bazaar": {
"present": true,
"inputMetadataPresent": true,
"outputMetadataPresent": true
},
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"payTo": "0x1111111111111111111111111111111111111111",
"scheme": "exact",
"network": "eip155:8453",
"amountUsd": "0.003",
"amountAtomic": "3000",
"amountUsdBasis": "USDC (6 decimals)",
"maxTimeoutSeconds": 60
}
],
"resourceUrl": "https://merchant.example/api/paid-resource",
"x402Version": 2
},
"limitations": [
"This unpaid probe does not verify settlement, merchant identity, or endpoint quality."
]
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"url"
],
"properties": {
"url": {
"type": "string",
"maxLength": 2048,
"description": "Public HTTPS x402 endpoint. Credentials, fragments, nonstandard ports, and local/private/reserved destinations are rejected."
},
"method": {
"enum": [
"GET",
"HEAD",
"POST"
],
"type": "string",
"default": "POST"
},
"expected": {
"type": "object",
"properties": {
"payTo": {
"type": "string",
"minLength": 1
},
"network": {
"type": "string",
"minLength": 1
},
"maxAmountUsd": {
"type": "number",
"maximum": 1000000,
"minimum": 0
}
},
"additionalProperties": false
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"required": [
"ok",
"service",
"version",
"target",
"probe",
"summary",
"challenge",
"findings",
"privacy",
"limitations"
],
"properties": {
"ok": {
"type": "boolean",
"const": true
},
"probe": {
"type": "object"
},
"target": {
"type": "object"
},
"privacy": {
"type": "object"
},
"service": {
"type": "string",
"const": "x402-endpoint-preflight"
},
"summary": {
"type": "object"
},
"version": {
"type": "string"
},
"findings": {
"type": "array",
"items": {
"type": "object",
"required": [
"severity",
"code",
"path",
"message"
],
"properties": {
"code": {
"type": "string"
},
"path": {
"type": "string"
},
"message": {
"type": "string"
},
"severity": {
"enum": [
"error",
"warning",
"info"
],
"type": "string"
}
},
"additionalProperties": false
}
},
"challenge": {
"oneOf": [
{
"type": "object"
},
{
"type": "null"
}
]
},
"limitations": {
"type": "array",
"items": {
"type": "string"
}
}
},
"additionalProperties": false
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-08-30 15:13Z
- Last indexed by Roundhouse
- 2026-09-10 12:50Z
- Last enriched (probe, favicon, geo)
- 2026-09-13 04:45Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 404
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 17 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service x402 Endpoint Preflight and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=x402%20Endpoint%20Preflight' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://email-preflight-api.vercel.app/api/x402-preflight, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402, or use an organization key from https://roundhouseai.io/dashboard/team. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.