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QuantaFlow x402 API Gateway – Infura Sepolia
x402
QuantaFlow x402 API Gateway – Infura Sepolia is a paid API for AI agents from quanta-roan.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-17).
Proxies requests to the Infura Sepolia (Ethereum testnet) JSON-RPC endpoint via the x402 micropayment protocol, charging $0.01 USDC per call.
Price / call$0.01
Success—
StatusUnknown
How this service works
Every request, a quantum of value. x402 protocol-based payment endpoint for web3/DeFi tools.
Output
The raw upstream Infura Sepolia JSON-RPC response body is passed through verbatim, including result fields such as block numbers, balances, transaction receipts, or error objects, along with the original content type.
Example use cases
Check Sepolia account balance
“Use the QuantaFlow Infura Sepolia gateway to run eth_getBalance for address 0xAbC123... on the latest block — I need to verify my test wallet has funds before running a script.”
Broadcast transaction to Sepolia
“Forward a signed raw transaction to the Sepolia testnet via the QuantaFlow gateway using eth_sendRawTransaction — here's the signed hex payload: 0xf86c...”
Query Sepolia smart contract state
“I need to call eth_call on my Sepolia contract at 0xDef456... with this calldata to read its current state — route it through the QuantaFlow Infura Sepolia endpoint and pay the micropayment fee.”
Technical details
Endpoint
POSThttps://quanta-roan.vercel.app/api/service/infura-sepolia?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need pay-per-use access to Infura's Sepolia Ethereum testnet RPC without managing your own Infura API key or subscription, and you are operating in a web3/x402 micropayment context where per-call USDC billing is acceptable. Ideal for agents that make sporadic testnet calls and want to avoid credential management.
Side effects
- Insufficient USDC balance or failed x402 payment returns 402 Payment Required
- Invalid JSON-RPC method or malformed body returns upstream Infura error (e.g. -32600 Invalid Request)
- Incorrect path routing results in 404 or upstream rejection
- Sepolia node unavailability causes 503 or timeout
- Rate limiting by upstream Infura returns 429
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| body | string | Optional JSON body forwarded to POST requests. |
| path | string | Path below the selected upstream origin. |
| query | object | |
| method | string |
Output
Schema · Response
{
"description": "The upstream response body and content type are passed through after successful payment."
}Tags
x402
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Zero review prompt (fires after every successful call)
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