# QuickNode JSON-RPC Proxy — Monad Testnet

> QuickNode JSON-RPC Proxy — Monad Testnet is a paid API for AI agents from x402.quicknode.com, paid per call via x402, $10/call, status unknown (last checked 2026-09-15).

Proxies JSON-RPC calls to the Monad testnet blockchain via QuickNode's infrastructure, enabling read and write interactions with Monad testnet nodes.

## Facts

- Endpoint: POST https://x402.quicknode.com/monad-testnet/
- Price: $10/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quicknode-50ec027b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VhKzktHcig0o38xe-QJXz

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 quicknode-50ec027b -d '<json body>'
```

Example prompt: Call eth_blockNumber on the Monad testnet to get the latest block, using JSON-RPC 2.0 with request ID 1 and an empty params array.

## When to prefer this

Use this endpoint when you need to interact specifically with the Monad testnet blockchain via standard Ethereum-compatible JSON-RPC methods. Prefer this over generic RPC providers when you need QuickNode's reliability and the Monad testnet is your target network. Choose this for development and testing workflows on Monad before deploying to mainnet.

## Known failure modes

- Invalid JSON-RPC method name returns error code -32601 (method not found)
- Malformed params array returns error code -32602 (invalid params)
- Network or node unavailability returns HTTP 503 or JSON-RPC internal error -32603
- Payment not provided or insufficient returns HTTP 402 payment required
- Rate limiting or quota exceeded returns HTTP 429

## How this service works

JSON-RPC proxy — monad-testnet

## Output

Returns a standard JSON-RPC 2.0 response object containing the result of the requested method (e.g. block number, balance in hex, transaction receipt, call return data) or an error object with code and message if the call fails.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "jsonrpc",
  "method"
 ],
 "properties": {
  "id": {
   "type": [
    "number",
    "string"
   ],
   "description": "Request identifier"
  },
  "method": {
   "type": "string",
   "description": "JSON-RPC method name (e.g., eth_blockNumber, eth_call)"
  },
  "params": {
   "type": "array",
   "description": "Method parameters"
  },
  "jsonrpc": {
   "type": "string",
   "const": "2.0"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "id": {
   "type": [
    "number",
    "string"
   ]
  },
  "error": {
   "type": "object",
   "properties": {
    "code": {
     "type": "integer"
    },
    "message": {
     "type": "string"
    }
   }
  },
  "result": {
   "description": "RPC result (type varies by method)"
  },
  "jsonrpc": {
   "type": "string",
   "const": "2.0"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/quicknode-50ec027b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.quicknode.com](https://www.zero.xyz/host/x402.quicknode.com/llms.txt)