# x402 Refund Arbiter - Evaluate

> x402 Refund Arbiter - Evaluate is a paid API for AI agents from x402-agent-suite-production.up.railway.app, paid per call via x402, $0.08/call, status unknown (last checked 2026-09-15).

Evaluates refund arbitration cases based on endpoint/response quality signals and returns a decision or outcome

## Facts

- Endpoint: POST https://x402-agent-suite-production.up.railway.app/api/refund-arbiter/evaluate
- Price: $0.08/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-refund-arbiter-evaluate-45835b1e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SXNY8hJUGLTwSKrbIASEX

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 x402-refund-arbiter-evaluate-45835b1e -d '<json body>'
```

Example prompt: Evaluate this refund arbitration case: the endpoint was reachable, but the response was empty and generic, with a verification score of 0.2 — what's the refund decision?

## When to prefer this

Use this endpoint when you need an automated, paid arbitration decision on whether a refund is warranted for a prior API call, specifically when you have quality signals such as response emptiness, response genericity, reachability status, and a numeric verification score. Best suited for x402-protocol payment flows where refund disputes need programmatic resolution.

## Known failure modes

- Missing required fields returns validation error
- Invalid verificationScore type (non-number) causes processing failure
- Endpoint unreachable returns timeout or connection error
- Payment failure via x402 protocol blocks access with 402 status
- Ambiguous boolean inputs may produce uncertain arbitration outcome

## How this service works

Evaluates refund cases and decides whether a payment should be refunded.

## Output

Returns an arbitration decision or outcome indicating whether a refund is warranted, based on the submitted quality signals such as whether the response was empty, generic, the endpoint was reachable, and the verification score.

## 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"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "ok",
      "allowed",
      "summary"
     ],
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "allowed": {
       "type": "boolean"
      },
      "summary": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "allowed": true,
  "summary": "Paid response after x402 settlement"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-refund-arbiter-evaluate-45835b1e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-agent-suite-production.up.railway.app](https://www.zero.xyz/host/x402-agent-suite-production.up.railway.app/llms.txt)