Pre-payment public-chain and caller-context checks for an agent before it pays a
Pre-payment public-chain and caller-context checks for an agent before it pays an x402 resource.
Answeringour last check, 2026-10-18
1 of 1checks answered this week
420 msmedian answer time
$0.01listed price per call
$0.01price 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://api.blockchainmoneymap.com/api/x402/payment-preflight
| Category | Everything else |
|---|---|
| Provider host | api.blockchainmoneymap.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-18 | valid payment request | 402 | $0.01 | 420 ms |
Example input (from the provider)
{
"body": {
"amount": "0.01",
"caller_context": {
"task": "Check whether this x402 payment target matches the expected service."
},
"chain": "base",
"currency": "USDC",
"expected_payee": "0x2211E12e6Bc8Da27B48B9DD66A55f5C3388D713a",
"max_amount": "0.05",
"payee": "0x2211E12e6Bc8Da27B48B9DD66A55f5C3388D713a",
"resource_url": "https://api.blockchainmoneymap.com/api/x402/wallet-snapshot"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"amount": {
"type": "string"
},
"caller_context": {
"type": "object"
},
"chain": {
"type": "string"
},
"currency": {
"enum": [
"USDC"
]
},
"expected_payee": {
"type": "string"
},
"max_amount": {
"type": "string"
},
"payee": {
"type": "string"
},
"resource_url": {
"format": "uri",
"type": "string"
}
},
"required": [
"chain",
"payee",
"amount",
"currency",
"resource_url"
],
"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": {
"additionalProperties": true,
"properties": {
"confidence": {
"enum": [
"high",
"medium",
"low"
],
"type": "string"
},
"decision": {
"type": "string"
},
"endpoint": {
"enum": [
"payment-preflight"
]
},
"evidence": {
"additionalProperties": true,
"type": "object"
},
"generated_at": {
"format": "date-time",
"type": "string"
},
"limits": {
"items": {
"type": "string"
},
"type": "array"
},
"payee_type": {
"type": "string"
},
"product_family": {
"enum": [
"agent_commerce_trust_api"
]
},
"recommended_next_action": {
"type": "string"
},
"request_id": {
"type": "string"
},
"risk_flags": {
"items": {
"type": "string"
},
"type": "array"
},
"summary": {
"type": "string"
},
"version": {
"enum": [
"v0.1"
]
},
"visible_activity": {
"additionalProperties": true,
"type": "object"
},
"x402_request_id": {
"description": "x402 route request ID used for Supabase x402_agent_requests ledger reconciliation when available.",
"type": "string"
}
},
"required": [
"product_family",
"endpoint",
"version",
"request_id",
"x402_request_id",
"generated_at",
"decision",
"confidence",
"summary",
"evidence",
"risk_flags",
"recommended_next_action",
"limits",
"payee_type",
"visible_activity"
],
"type": "object"
},
"type": {
"enum": [
"json"
],
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}