Smallest end-to-end test of an x402 client on Base
Smallest end-to-end test of an x402 client on Base: one call with no required parameters returns server time (ISO 8601 and Unix ms), a request id, the seller payTo, chain id and an echo of your optional text, only after a real settlement. Use this when an agent needs to prove its payment flow works, measure round-trip latency or run a cheap scheduled canary against a live seller. No upstream, no model inference; paid round trip 1 to 2 s (settlement first). Free sample at /api/x402-ping/sample.
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://tienda.textokit.store/api/x402-ping
| Category | Commerce and shopping |
|---|---|
| Provider host | tienda.textokit.store |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 5 from 3 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-20 | valid payment request | 402 | $0.001 | 1203 ms |
Example input (from the provider)
{
"body": {
"echo": "hello"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"echo": {
"description": "Optional text echoed back (up to 200 characters).",
"maxLength": 200,
"type": "string"
}
},
"type": "object"
},
"bodyType": {
"const": "json",
"type": "string"
},
"method": {
"const": "POST",
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"body"
],
"type": "object"
},
"output": {
"properties": {
"echo": {
"type": "string"
},
"ok": {
"type": "boolean"
},
"payer": {
"type": "string"
},
"policy": {
"type": "string"
},
"requestId": {
"type": "string"
},
"seller": {
"type": "object"
},
"serverTime": {
"type": "string"
},
"unixMs": {
"type": "number"
}
},
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}