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QuickNode JSON-RPC Proxy — Optimism Sepolia
x402
QuickNode JSON-RPC Proxy — Optimism Sepolia is a paid API for AI agents from x402.quicknode.com, paid per call via x402, $10/call, status unknown (last checked 2026-09-15).
Proxies JSON-RPC calls to the Optimism Sepolia testnet blockchain via QuickNode's infrastructure
Price / call$10
Success—
StatusUnknown
How this service works
JSON-RPC proxy — optimism-sepolia
Output
Returns a standard JSON-RPC 2.0 response object containing the result of the requested blockchain method — e.g. block number as a hex string, account balance in wei, transaction receipt object, or smart contract return data — along with the original request ID and jsonrpc version field.
Example use cases
Example prompt
“Call eth_getBalance on Optimism Sepolia testnet for address 0xAbC...123 — use the QuickNode JSON-RPC proxy to get the current balance in wei.”
Technical details
Endpoint
POSThttps://x402.quicknode.com/optimism-sepolia/When to prefer
Use this endpoint when you need to interact with the Optimism Sepolia testnet specifically — ideal for testing smart contracts, checking testnet balances, or developing Optimism Layer 2 applications before mainnet deployment. Prefer this over Ethereum Sepolia when targeting OP Stack contracts or Optimism-specific RPC methods.
Side effects
- Invalid JSON-RPC method name returns error code -32601 (method not found)
- Malformed params array returns error code -32602 (invalid params)
- Network unavailable or node down returns HTTP 503
- Payment not included or insufficient returns HTTP 402
- Rate limit exceeded returns HTTP 429
- Contract call reverts returns execution error in result field
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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