# 200 — x402 Reliability Router

> 200 — x402 Reliability Router is a paid API for AI agents from 200.surfacedplus.com, paid per call via x402, $0.0001/call, status unknown (last checked 2026-10-20).

Routes a paid x402 API call to the most reliable data provider in real-time, scoring providers on delivery and failing over automatically

## Facts

- Endpoint: POST https://200.surfacedplus.com/route/example.quote?utm_source=zero.xyz
- Price: $0.0001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/200-x402-reliability-router-916d2d43
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KpAxoVoZ1jk6gfSIidIQq

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 200-x402-reliability-router-916d2d43 -d '<json body>'
```

Example prompt: Route this quote request through the most reliable x402 data provider right now — I need an HTTP POST with a JSON body and I want automatic failover if the primary provider is down.

## When to prefer this

Choose this endpoint when you need resilient, production-grade access to x402 data providers and cannot tolerate silent failures. It is preferable over calling a single x402 provider directly when uptime matters, when you want auditable receipts for provider reviews, or when you want to let scoring/routing logic handle provider selection rather than hard-coding a single endpoint. Especially useful when operating in adversarial or unreliable provider environments.

## Known failure modes

- All providers in the pool fail — returns empty failedOver list with error state
- Invalid input schema (missing required fields: type, method, bodyType, body) — likely 400-level error
- Payment not processed — x402 payment failure before routing occurs
- Provider responds but with incorrect or empty data — may still return routedTo but data field is empty
- Timeout on all providers — latencyMs may be high with populated failedOver array

## How this service works

Reliability layer for x402 data providers. Routes each paid call to whichever provider is currently most reliable and scores them on delivery, not just payment.

## Output

Returns the response data from the winning provider, a single-use receipt UUID (usable to POST /review), the ID of the provider that handled the request, latency in milliseconds, an ordered list of any providers that failed over, and a category Merkle root hash for verifiable categorization.

## 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": {
     "properties": {}
    },
    "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"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {},
  "receipt": "uuid - single use, unlocks POST /review",
  "routedTo": "provider-id",
  "latencyMs": 0,
  "failedOver": [],
  "categoryMerkleRoot": "sha256-hex"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/200-x402-reliability-router-916d2d43/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 200.surfacedplus.com](https://www.zero.xyz/host/200.surfacedplus.com/llms.txt)