x402 Preflight
One unpaid-probe preflight report for an x402 endpoint.
OtherLiveeip155:8453Exactvia facilitator:payAI
x402PreflightVerificationSafetyAgents
Settlements · 30d
69↓ 19%
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$0.27
Verified settled volume
68 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0040
Listed price
As published in the catalog. Always read the live 402 before paying.
—
Calls · 30d
Upstream's own call count for this endpoint, not ours.
—
Unique payers · 30d
Never called
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xB5bC75A1085345B89531DE4bfA1FF19EE8F9c29aThe 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.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"error": "payment_required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xB5bC75A1085345B89531DE4bfA1FF19EE8F9c29a",
"amount": "4000",
"scheme": "exact",
"network": "eip155:8453",
"mimeType": "application/json",
"resource": "https://dznviqumoishbyp7dtbwld5444.srv.us/preflight",
"description": "One unpaid-probe preflight report for an x402 endpoint.",
"maxTimeoutSeconds": 120
},
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xB5bC75A1085345B89531DE4bfA1FF19EE8F9c29a",
"scheme": "exact",
"network": "base",
"mimeType": "application/json",
"resource": "https://dznviqumoishbyp7dtbwld5444.srv.us/preflight",
"description": "One unpaid-probe preflight report for an x402 endpoint.",
"outputSchema": {
"input": {
"body": {
"url": "https://example.com/paid-endpoint",
"expect": {
"pay_to": "0x... optional: recipient you were promised",
"network": "base — optional",
"max_amount": "10000 — optional, base units"
}
},
"type": "http",
"method": "POST",
"bodyType": "json",
"discoverable": true
},
"output": {
"type": "json",
"example": {
"verdict": "do_not_pay",
"findings": [
{
"code": "payto_mismatch",
"level": "blocking",
"detail": "Endpoint asks payment to a different address than you expected."
}
],
"challenge": {
"pay_to": [
"0x..."
],
"amounts": [
"10000"
],
"networks": [
"base"
]
},
"http_status": 402
}
}
},
"maxAmountRequired": "4000",
"maxTimeoutSeconds": 120
}
],
"resource": {
"url": "https://dznviqumoishbyp7dtbwld5444.srv.us/preflight",
"tags": [
"x402",
"preflight",
"verification",
"safety",
"agents"
],
"mimeType": "application/json",
"description": "One unpaid-probe preflight report for an x402 endpoint.",
"serviceName": "x402 Preflight"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"url": "https://example.com/paid-endpoint",
"expect": {
"pay_to": "0x... optional: recipient you were promised",
"network": "base — optional",
"max_amount": "10000 — optional, base units"
}
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"verdict": "do_not_pay",
"findings": [
{
"code": "payto_mismatch",
"level": "blocking",
"detail": "Endpoint asks payment to a different address than you expected."
}
],
"challenge": {
"pay_to": [
"0x..."
],
"amounts": [
"10000"
],
"networks": [
"base"
]
},
"http_status": 402
}
}
},
"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",
"description": "The x402 endpoint to probe (unpaid). Must be https."
},
"expect": {
"type": "object",
"properties": {
"pay_to": {
"type": "string",
"description": "Recipient address you were promised; mismatch is a blocking finding."
},
"network": {
"type": "string",
"description": "Network you intend to pay on, e.g. base or eip155:8453."
},
"max_amount": {
"type": "string",
"description": "Price ceiling in base units (USDC has 6 decimals)."
}
}
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"properties": {
"verdict": {
"enum": [
"safe_to_attempt",
"pay_with_caution",
"do_not_pay",
"unreachable"
],
"type": "string"
},
"findings": {
"type": "array"
},
"challenge": {
"type": "object"
},
"http_status": {
"type": "integer"
}
}
}
}
}
}
}
}
},
"x402Version": 2
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.004USDC≈ $0.004 USD
on Base · exact scheme
Pay 0.004 USDC on Base to 0xB5bC…9c29a. The signed payment is good for 2 minutes.
- Paid to
- 0xB5bC…9c29a
- USD Coin contract
- 0x8335…02913
- Payment window
- 2 minutes
- As published
- 4000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xB5bC75A1085345B89531DE4bfA1FF19EE8F9c29a",
"amount": "4000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 120
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"url": "https://example.com/paid-endpoint",
"expect": {
"pay_to": "0x... optional: recipient you were promised",
"network": "base — optional",
"max_amount": "10000 — optional, base units"
}
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"verdict": "do_not_pay",
"findings": [
{
"code": "payto_mismatch",
"level": "blocking",
"detail": "Endpoint asks payment to a different address than you expected."
}
],
"challenge": {
"pay_to": [
"0x..."
],
"amounts": [
"10000"
],
"networks": [
"base"
]
},
"http_status": 402
}
}
},
"schema": {
"type": "object",
"$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",
"description": "The x402 endpoint to probe (unpaid). Must be https."
},
"expect": {
"type": "object",
"properties": {
"pay_to": {
"type": "string",
"description": "Recipient address you were promised; mismatch is a blocking finding."
},
"network": {
"type": "string",
"description": "Network you intend to pay on, e.g. base or eip155:8453."
},
"max_amount": {
"type": "string",
"description": "Price ceiling in base units (USDC has 6 decimals)."
}
}
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"properties": {
"verdict": {
"enum": [
"safe_to_attempt",
"pay_with_caution",
"do_not_pay",
"unreachable"
],
"type": "string"
},
"findings": {
"type": "array"
},
"challenge": {
"type": "object"
},
"http_status": {
"type": "integer"
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-09-24 03:46Z
- Last indexed by Roundhouse
- 2026-09-24 07:45Z
- Last enriched (probe, favicon, geo)
- 2026-09-14 18:46Z
- x402 version
- 2
- Max timeout
- 120s
- Liveness probe
- HTTP 402
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
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days. 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 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%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://dznviqumoishbyp7dtbwld5444.srv.us/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.