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QuickNode JSON-RPC Proxy — Mantle Sepolia
x402
QuickNode JSON-RPC Proxy — Mantle 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 Mantle Sepolia testnet via QuickNode's infrastructure, enabling blockchain reads and writes over a pay-per-call x402 payment model.
Price / call$10
Success—
StatusUnknown
How this service works
JSON-RPC proxy — mantle-sepolia
Output
Returns a standard JSON-RPC 2.0 response object containing the result of the requested method (e.g., block number as a hex string, transaction data as an object, contract call return value) or an error object with code and message if the call fails.
Example use cases
Check testnet smart contract balance
“Check the MNT token balance for my deployed contract on Mantle Sepolia — call eth_call with the contract address and the balanceOf function signature to see how much test MNT it's holding.”
Debug failing transaction before mainnet
“Fetch the transaction receipt for my failed test tx on Mantle Sepolia to see the revert reason and gas usage — I need to understand what went wrong before deploying to mainnet.”
Estimate gas for Layer 2 contract call
“Estimate the gas cost for my smart contract interaction on Mantle Sepolia testnet — run eth_estimateGas with my contract call data so I know how much test gas I'll need.”
Technical details
Endpoint
POSThttps://x402.quicknode.com/mantle-sepolia/When to prefer
Use this endpoint when you need to interact with the Mantle Sepolia testnet specifically — for testing Mantle Layer 2 smart contracts, checking testnet state, or broadcasting test transactions without using real funds. Prefer this over general Ethereum RPC endpoints when your target is the Mantle L2 environment, and over the Mantle mainnet endpoint when you want a risk-free testnet environment.
Side effects
- Invalid JSON-RPC method name returns error code -32601 (method not found)
- Malformed params array returns error code -32602 (invalid params)
- Payment failure or insufficient USDC balance blocks the request with a 402 response
- Network or node downtime on Mantle Sepolia returns a 5xx or timeout error
- Calling mainnet-only methods on a testnet returns an unsupported method 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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