# QuickNode Base Mainnet JSON-RPC

> QuickNode Base Mainnet JSON-RPC 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 Base mainnet blockchain via QuickNode's paid RPC infrastructure

## Facts

- Endpoint: POST https://x402.quicknode.com/base-mainnet
- 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/x402-quicknode-com-333e74c4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vwpSii7scGOMe6aWrH94h

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 x402-quicknode-com-333e74c4 -d '<json body>'
```

Example prompt: Can you call eth_getBalance on Base mainnet for the address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 using QuickNode's RPC — I need to know the current ETH balance in wei.

## When to prefer this

Use this endpoint when you need reliable, paid-tier JSON-RPC access to Base mainnet (the Coinbase-incubated EVM L2) with per-request micropayment billing. Prefer over free public RPCs when you need guaranteed uptime and rate-limit headroom. Choose over other QuickNode sibling endpoints specifically for Base mainnet (not Ethereum, Mantle, or other chains).

## Known failure modes

- Payment not included or insufficient — 402 Payment Required response
- Invalid JSON-RPC method name — returns JSON-RPC error with code -32601
- Malformed params array — returns JSON-RPC error with code -32602
- Network congestion or node unavailability — 503 or timeout
- Reverted contract call — returns execution revert error in result
- Invalid address or transaction hash format — JSON-RPC parse error

## How this service works

Payment for Quicknode RPC access. Options: per-request ($0.001/request), nanopayment ($0.0001/request via Circle Gateway), or credit drawdown with SIWX authentication.

## Output

A JSON-RPC response object containing the result of the requested method call (e.g. block number as hex, balance in wei, transaction receipt object, contract return data), with fields: id, jsonrpc, and result (or error 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/x402-quicknode-com-333e74c4/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)