# 200 ERC20 Balance Reliability Router

> 200 ERC20 Balance Reliability Router is a paid API for AI agents from 200.surfacedplus.com, paid per call via x402, $0.0036/call, status unknown (last checked 2026-10-19).

Routes an ERC20 token balance lookup through the most reliable x402 data provider available, with automatic failover and provider scoring

## Facts

- Endpoint: POST https://200.surfacedplus.com/route/erc20.balance?utm_source=zero.xyz
- Price: $0.0036/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/200-erc20-balance-reliability-router-e835d069
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uikHWa2MTQTgQOpZS4uwI

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-erc20-balance-reliability-router-e835d069 -d '<json body>'
```

Example prompt: Check the ERC20 token balance for wallet 0xAbc...123 on Ethereum mainnet — route it through whichever provider is most reliable right now and let me know if any failover happened.

## When to prefer this

Choose this endpoint when you need ERC20 balance data and cannot tolerate single-provider downtime — it adds automatic failover, reliability scoring, and an auditable merkle root at a small per-call cost. Prefer it over calling a single RPC or data provider directly when uptime and data delivery quality matter more than minimizing latency overhead.

## Known failure modes

- All available providers are down or unreliable — no successful route found
- Invalid or malformed wallet/token address in request body — provider rejects query
- Payment not accepted or x402 handshake fails — call not processed
- Network or timeout error reaching selected provider — partial failover list returned
- Malformed JSON body — 400-level error before routing occurs

## 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 ERC20 balance data from the winning provider, the provider ID that served the request, latency in milliseconds, a list of providers that failed over, a category merkle root for auditability, and a single-use receipt UUID that unlocks a POST /review endpoint for rating the provider.

## 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-erc20-balance-reliability-router-e835d069/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)