# QuickNode JSON-RPC Proxy — XAI Mainnet

> QuickNode JSON-RPC Proxy — XAI Mainnet 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 XAI blockchain mainnet, enabling agents to read chain state, submit transactions, and interact with smart contracts.

## Facts

- Endpoint: POST https://x402.quicknode.com/xai-mainnet/
- 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-9b9f8d56
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TSE4z96b5HO1PXQDkEI1_

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-9b9f8d56 -d '<json body>'
```

Example prompt: Call eth_blockNumber on the XAI mainnet to get the current block height — use JSON-RPC 2.0 with request id 1 and no params.

## When to prefer this

Use this endpoint when you specifically need to interact with the XAI mainnet blockchain (not testnet) via standard Ethereum-compatible JSON-RPC. Prefer this over generic RPC providers when you need a reliable, pay-per-call QuickNode-backed node for XAI without managing API keys or subscriptions — the x402 micropayment model makes it suitable for agent-driven, on-demand blockchain queries.

## 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
- Network congestion or node unavailability returns HTTP 503 or timeout
- Invalid address or block reference returns execution error in result

## How this service works

JSON-RPC proxy — xai-mainnet

## Output

A standard JSON-RPC 2.0 response object containing the result of the requested method (e.g. current block number, balance in hex, transaction receipt object, smart contract call output) or an error object if the call failed.

## 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-9b9f8d56/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)