# QuickNode JSON-RPC Proxy — Ink Sepolia Testnet

> QuickNode JSON-RPC Proxy — Ink Sepolia 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 Ink Sepolia testnet blockchain node via QuickNode's infrastructure

## Facts

- Endpoint: POST https://x402.quicknode.com/ink-sepolia/
- 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-5484fed4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ggyAd5W8UGLoDVJB8ONw6

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-5484fed4 -d '<json body>'
```

Example prompt: Can you call eth_getBalance on address 0xAbCd...1234 on the Ink Sepolia testnet and tell me the current ETH balance?

## When to prefer this

Use this endpoint when you need to interact with the Ink Sepolia testnet specifically — for testing Ink-based smart contracts, verifying testnet transactions, or developing dApps before mainnet deployment. Prefer this over generic Ethereum testnets when your contracts are deployed on Ink Sepolia. Use QuickNode's infrastructure when you need reliable, low-latency RPC access without managing your own node.

## Known failure modes

- Invalid JSON-RPC method name returns error code -32601 method not found
- Malformed params array causes -32602 invalid params error
- Network congestion or node unavailability returns HTTP 503 or timeout
- Payment failure (insufficient USDC or x402 protocol error) blocks request
- Ink Sepolia testnet downtime causes unavailability
- Calling mainnet-only methods that are not supported on testnet

## How this service works

JSON-RPC proxy — ink-sepolia

## Output

Returns a standard JSON-RPC 2.0 response object containing the result field with blockchain data (e.g. block number as hex, account balance in wei, transaction hash, contract 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-5484fed4/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)