Before paying an x402 service you have never used, ask whether it works
Before paying an x402 service you have never used, ask whether it works. Kortex answers from evidence: uptime measured over time, whether the endpoint returns a valid 402, and how many distinct wallets have actually paid its address on-chain. Measured across 1,015 listed services, only 25% answer with a payment requirement at all. US$1.00 of prepaid credit, about 200 checks, debited off-chain.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
639 msmedian answer time
$1.00listed price per call
$1.00price 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://kortex.rohnelt.dev/v1/credit/deposit/1
| Category | Market data |
|---|---|
| Provider host | kortex.rohnelt.dev |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $1.00 | 639 ms |
Example input (from the provider)
{
"body": {},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {},
"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": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}