QuantaFlow x402 API Gateway – Alchemy Stable Testnet

x402

QuantaFlow x402 API Gateway – Alchemy Stable Testnet is a paid API for AI agents from quanta-roan.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-18).

Proxies requests to Alchemy's stable testnet APIs via an x402 micropayment-gated gateway, forwarding arbitrary paths, query params, and request bodies to the upstream Alchemy service.

Price / call$0.01

Seller volume →—

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 Alchemy stable testnet API response body is passed through as-is, along with the original content type. The agent receives whatever JSON or data the Alchemy endpoint returns after the x402 payment is verified and the request is forwarded.

Example use cases

Check testnet wallet balance

“Get the ETH balance for wallet address 0xABC123 on the Alchemy stable testnet — use QuantaFlow to pay the per-call fee and give me the result.”

Fetch testnet NFT ownership data

“Query the Alchemy stable testnet for all NFTs owned by address 0xDEF456 using the getNFTs path — route it through QuantaFlow and pay the micropayment fee.”

Simulate testnet smart contract call

“Forward a POST to Alchemy stable testnet at path '/v2/eth_call' with body '{"to":"0xContract","data":"0xcalldata"}' via QuantaFlow and return whatever the upstream responds with.”

Technical details

Endpoint

POSThttps://quanta-roan.vercel.app/api/service/alchemy-stable-testnet?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need pay-per-call access to Alchemy's stable testnet APIs without committing to a subscription plan, or when operating in a web3/DeFi agent context where x402 micropayments are the preferred payment mechanism. Ideal for low-frequency or automated testnet queries where per-request USDC billing is more efficient than a monthly API key.

Side effects

Payment verification failure if insufficient USDC balance or invalid x402 header — gateway returns 402 Payment Required
Invalid or unsupported path results in upstream 404 from Alchemy
Malformed JSON body causes upstream 400 Bad Request passed through
Alchemy rate limits or API key exhaustion may return 429 upstream
Testnet instability or Alchemy downtime results in 502/503 passthrough errors
Missing required 'path' parameter results in gateway-level error

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."
}

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