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QuickNode JSON-RPC Proxy — B3 Sepolia
x402
QuickNode JSON-RPC Proxy — B3 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 B3 Sepolia testnet blockchain via QuickNode's infrastructure
Price / call$10
Success—
StatusUnknown
How this service works
JSON-RPC proxy — b3-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 contract call return data — along with the matching request id and jsonrpc version field.
Example use cases
Example prompt
“Can you call eth_getBalance on B3 Sepolia testnet for address 0xAbC123... using QuickNode's RPC proxy and tell me the current balance?”
Technical details
Endpoint
POSThttps://x402.quicknode.com/b3-sepolia/When to prefer
Use this endpoint when you need to interact specifically with the B3 Sepolia testnet via a reliable, low-latency RPC provider. Prefer this over self-hosted or free public RPC endpoints when you need consistent uptime and QuickNode's infrastructure. Choose this over other QuickNode sibling endpoints when your target chain is B3 Sepolia (not mainnet, not other testnets).
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 or JSON-RPC internal error -32603
- Insufficient payment (x402 payment missing or wrong amount) returns HTTP 402 Payment Required
- Unsupported method for B3 Sepolia returns error response
- Transaction submission with bad nonce or gas returns execution error
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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