# QuickNode JSON-RPC Proxy — Avalanche Testnet

> QuickNode JSON-RPC Proxy — Avalanche Testnet is a paid API for AI agents from x402.quicknode.com, paid per call via x402, $10/call, status unknown (last checked 2026-09-14).

Proxies JSON-RPC calls to the Avalanche testnet blockchain network via QuickNode infrastructure

## Facts

- Endpoint: POST https://x402.quicknode.com/avalanche-testnet/
- Price: $10/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quicknode-25fe5bd4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Of9jheIQUFuD-UvwcByLr

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-25fe5bd4 -d '<json body>'
```

Example prompt: Send an eth_call JSON-RPC request to the Avalanche testnet to read the return value of the balanceOf function at contract address 0xABC123 for wallet 0xDEF456, using params [{'to':'0xABC123','data':'0x70a08231...'},'latest'] and request ID 1.

## When to prefer this

Use this endpoint when you need to interact with the Avalanche testnet (Fuji) specifically for development, testing, or debugging smart contracts and transactions before deploying to mainnet. Prefer this over Avalanche mainnet endpoints when you want to avoid real asset risk. Choose QuickNode over self-hosted nodes for reliability and low latency.

## Known failure modes

- Invalid JSON-RPC method name returns error code -32601 Method not found
- Malformed params array returns error code -32602 Invalid params
- Payment not provided or insufficient returns HTTP 402 Payment Required
- Network congestion or node unavailability returns HTTP 503 or timeout
- Testnet node sync lag may return stale or inconsistent data

## How this service works

JSON-RPC proxy — avalanche-testnet

## Output

Returns a standard JSON-RPC 2.0 response object containing the result field with the requested blockchain data (e.g. block number, balance in hex, transaction receipt, call return value) 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-25fe5bd4/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)