# MCPFax Reliability Score

> MCPFax Reliability Score is a paid API for AI agents from mcpfax-reliability.bowling-anthony.workers.dev, paid per call via x402, $0.008/call, status unknown (last checked 2026-09-15).

Returns a credit-style reliability grade, subscores, confidence level, and cited evidence for x402 sellers listed on MCPFax

## Facts

- Endpoint: GET https://mcpfax-reliability.bowling-anthony.workers.dev/score
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mcpfax-reliability-score-25124df5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7IcnW8pRXJp-X0JOTiDnV

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 mcpfax-reliability-score-25124df5
```

Example prompt: Can you pull the MCPFax reliability score for this x402 seller — I want to see the credit grade, subscores, confidence level, and what evidence they cite?

## When to prefer this

Use this endpoint when you need a structured, evidence-backed trust signal for an x402 seller before routing paid API calls to them. It is specifically designed for the MCPFax/x402 marketplace ecosystem and provides richer detail (subscores + evidence) than a simple pass/fail check. Prefer it over raw change-feed monitoring when you need a synthesized, point-in-time reliability judgment rather than raw event history.

## Known failure modes

- Unknown seller identifier returns no score or a 404-equivalent response
- Insufficient data on a new seller results in a low confidence score or null grade
- Malformed query parameters cause a 400 bad request error
- Payment of 0.002 USDC not received results in 402 Payment Required blocking the response
- Seller data may be stale if the underlying change feed has not updated recently

## How this service works

MCPFax credit grade, subscores, confidence, and cited evidence

## Output

Returns a structured reliability assessment including an overall credit-style grade (e.g. A, B, C), individual subscores covering dimensions of seller reliability, a confidence percentage indicating how certain the scoring model is, and cited evidence references supporting the assessment — all specific to the queried x402 seller.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object"
    }
   },
   "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/mcpfax-reliability-score-25124df5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcpfax-reliability.bowling-anthony.workers.dev](https://www.zero.xyz/host/mcpfax-reliability.bowling-anthony.workers.dev/llms.txt)