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QuickNode JSON-RPC Proxy — Arbitrum Sepolia
x402
QuickNode JSON-RPC Proxy — Arbitrum Sepolia 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 Arbitrum Sepolia testnet via QuickNode's blockchain node infrastructure
Price / call$10
Success—
StatusUnknown
How this service works
JSON-RPC proxy — arbitrum-sepolia
Output
Returns a standard JSON-RPC 2.0 response object containing the result of the requested method (e.g. block data, balance in hex wei, transaction receipt, contract return value) or an error object with code and message if the call fails.
Example use cases
Example prompt
“Call eth_getBalance on Arbitrum Sepolia for address 0xAbCd1234... at block 'latest' using QuickNode's JSON-RPC proxy.”
Technical details
Endpoint
POSThttps://x402.quicknode.com/arbitrum-sepolia/When to prefer
Use this endpoint when you need to interact specifically with the Arbitrum Sepolia testnet — for example, testing smart contracts, querying testnet balances, or simulating transactions before mainnet deployment. Prefer this over generic RPC providers when you need a reliable, pay-per-call QuickNode-backed node without managing your own infrastructure.
Side effects
- Invalid JSON-RPC method name returns error code -32601 (method not found)
- Malformed params array returns error code -32602 (invalid params)
- Payment not included or insufficient returns HTTP 402
- Network congestion on Arbitrum Sepolia may cause delayed responses
- Testnet node downtime returns HTTP 503 or connection error
- Requesting finalized state for a very recent block may return null
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| id | — | Request identifier |
| methodrequired | string | JSON-RPC method name (e.g., eth_blockNumber, eth_call) |
| params | array | Method parameters |
| jsonrpcrequired | string |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| id | — | |
| error | object | |
| result | — | RPC result (type varies by method) |
| jsonrpc | string |
Tags
x402
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