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QuantaFlow x402 API Gateway — Alchemy Base Sepolia
x402
QuantaFlow x402 API Gateway — Alchemy Base 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 2026-10-10).
Proxies requests to Alchemy's Base Sepolia RPC/API 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 response from Alchemy's Base Sepolia API is passed through as-is, including the original content type. Typical responses are JSON-RPC result objects containing blockchain data such as block numbers, transaction receipts, account balances, or contract call results.
Example use cases
Check latest Base Sepolia block
“Query the latest block number on the Base Sepolia testnet through the Alchemy gateway — just send eth_blockNumber with no extra params.”
Fetch testnet transaction receipt
“I need the transaction receipt for hash 0xabc123... on Base Sepolia — route it through the Alchemy proxy using path /v2/eth_getTransactionReceipt.”
Read smart contract state on testnet
“Call eth_call on Base Sepolia to read the balanceOf function from contract 0xDEAD...BEEF for address 0x1234... — forward it via the Alchemy Base Sepolia gateway.”
Technical details
Endpoint
POSThttps://quanta-roan.vercel.app/api/service/alchemy-base-sepolia?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need pay-per-use access to Alchemy's Base Sepolia RPC without managing an Alchemy API key or subscription — ideal for agents making infrequent or variable-volume testnet calls where a flat $0.01 USDC per-call cost is preferable to a monthly plan. Best suited for Base Sepolia testnet use cases (development, testing, DeFi prototyping) rather than mainnet production workloads.
Side effects
- Payment failure: insufficient USDC balance causes x402 402 Payment Required error
- Invalid path: unrecognized Alchemy API path returns upstream 404 or error
- Malformed JSON body: upstream returns RPC error for invalid method or params
- Network unavailability: Alchemy Base Sepolia endpoint down, returns 502 or timeout
- Rate limiting: upstream Alchemy rate limit hit, returns 429 passed through
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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