# Kortex Service Trust Check

> Kortex Service Trust Check is a paid API for AI agents from kortex.rohnelt.dev, paid per call via x402, $1/call, status unknown (last checked 2026-09-15).

Checks whether an x402 service endpoint is trustworthy by measuring its uptime, valid 402 response rate, and on-chain payment history before you pay it

## Facts

- Endpoint: POST https://kortex.rohnelt.dev/v1/credit/deposit/1
- Price: $1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/kortex-service-trust-check-4f77a92b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FluwU6l1Utz01tHX0GHt9

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability kortex-service-trust-check-4f77a92b -d '<json body>'
```

Example prompt: Before my agent pays that x402 service at api.example.com, can you check Kortex to see if it's actually trustworthy — whether it returns a valid 402, has real uptime history, and has been paid by other wallets on-chain?

## When to prefer this

Choose this endpoint when an AI agent or user is about to pay an unfamiliar x402 service and needs evidence-based trust signals before committing funds. It is specifically designed for the x402 payment protocol ecosystem, covering uptime history, 402 validity, and actual on-chain payment counts — something generic uptime monitors or blockchain explorers cannot combine in one call. Prefer this over manual inspection when operating autonomously or at scale across many x402 services.

## Known failure modes

- Endpoint has never been indexed by Kortex — no data available
- Target x402 service URL is unreachable at check time
- Insufficient prepaid credit balance to complete the check
- Service returns ambiguous or non-standard 402 response that cannot be validated
- On-chain data unavailable due to blockchain RPC issues

## How this service 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.

## Output

Returns trust evidence for a given x402 service endpoint: whether it responds with a valid 402 payment requirement, measured uptime over time, and the count of distinct wallets that have paid its on-chain address. Helps an agent decide whether to proceed with payment to an unfamiliar service.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "properties": {},
     "additionalProperties": false
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/kortex-service-trust-check-4f77a92b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from kortex.rohnelt.dev](https://www.zero.xyz/host/kortex.rohnelt.dev/llms.txt)