x402 PayTo Pre-Flight
x402 PayTo Pre-Flight: verify a payTo address against the live registry before paying. Detects payTo hijacking, stale endpoints and unknown resources. Deterministic, <200ms, no external network. 0.001 USDC via x402 on Base. SYNTHORA.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
923 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://payto-preflight.hergertsynthora.com/service
| Category | Company and compliance |
|---|---|
| Provider host | payto-preflight.hergertsynthora.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 |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.01 | 923 ms |
Example input (from the provider)
{
"body": {
"chain": "eip155:8453",
"endpoint_url": "https://onchain.hergertsynthora.com/service",
"expected_payTo": "0xEf879BFD6C4AccB8F795136de90246e1EC245e06"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"chain": {
"description": "expected chain, e.g. eip155:8453",
"type": "string"
},
"endpoint_url": {
"description": "endpoint resource URL to verify",
"type": "string"
},
"expected_payTo": {
"description": "expected payTo address (0x...)",
"type": "string"
}
},
"required": [
"endpoint_url"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"niche": {
"type": "string"
},
"ok": {
"type": "boolean"
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}