x402 pre-listing QA probe
x402 pre-listing QA probe: validate your endpoint's 402 challenge, header sizes, and payment schema before listing
Answeringour last check, 2026-10-19
1 of 1checks answered this week
910 msmedian answer time
$0.005listed price per call
$0.005price 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://predator-ubuntu.taild9a745.ts.net/v1/preflight
| Category | Everything else |
|---|---|
| Provider host | predator-ubuntu.taild9a745.ts.net |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 0 from 0 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-19 | valid payment request | 402 | $0.005 | 910 ms |
Example input (from the provider)
{
"body": {
"url": "https://example.com/v1/my-tool"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"properties": {
"input": {
"properties": {
"body": {
"properties": {
"body": {
"type": "object"
},
"method": {
"enum": [
"GET",
"POST"
],
"type": "string"
},
"url": {
"format": "uri",
"type": "string"
}
},
"required": [
"url"
],
"type": "object"
},
"bodyType": {
"const": "json"
},
"method": {
"const": "POST"
},
"type": {
"const": "http"
}
},
"type": "object"
}
},
"type": "object"
}