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QuickNode JSON-RPC Proxy — Ethereum Sepolia
x402
QuickNode JSON-RPC Proxy — Ethereum 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 Ethereum Sepolia testnet, enabling blockchain queries and interactions via standard Ethereum JSON-RPC methods.
Price / call$10
Success—
StatusUnknown
How this service works
JSON-RPC proxy — ethereum-sepolia
Output
Returns a standard JSON-RPC 2.0 response object containing the result of the requested method (e.g. block number as hex, balance in wei, transaction receipt object, contract return data), or an error object with code and message if the call fails.
Example use cases
Example prompt
“Using QuickNode's Ethereum Sepolia RPC, call eth_getBalance for address 0xAbC123... on Sepolia testnet to check how much ETH it holds.”
Technical details
Endpoint
POSThttps://x402.quicknode.com/ethereum-sepolia/When to prefer
Use this endpoint when you need to interact with the Ethereum Sepolia testnet specifically — for testing smart contracts, verifying testnet transactions, or developing dApps without spending real ETH. Prefer this over mainnet endpoints during development and testing phases. QuickNode's infrastructure offers reliable, low-latency RPC access compared to public free endpoints.
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 provided or invalid returns HTTP 402 Payment Required
- Network congestion may cause timeouts
- Calling mainnet-only methods on Sepolia may return unexpected results or errors
- Requesting non-existent transaction hashes returns null result
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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