# QuantaFlow x402 API Gateway — Alchemy ETH Mainnet

> QuantaFlow x402 API Gateway — Alchemy ETH Mainnet is a paid API for AI agents from quanta-roan.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-12).

Proxies requests to the Alchemy Ethereum Mainnet API via x402 micropayment protocol, charging $0.01 USDC per call

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/alchemy-eth-mainnet?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-x402-api-gateway-alchemy-eth-mainnet-f2014678
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_i7rIJVVQQGf2x5ccPvRJ4

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability quantaflow-x402-api-gateway-alchemy-eth-mainnet-f2014678 -d '<json body>'
```

Example prompt: Can you look up the current ETH balance for address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on the Ethereum mainnet using the Alchemy gateway?

## When to prefer this

Choose this endpoint when you need pay-per-call access to the Alchemy Ethereum Mainnet API without committing to a subscription, especially in agent workflows that make sporadic or low-volume blockchain queries and benefit from x402 micropayment automation. Prefer this over direct Alchemy API keys when operating in a web3-native, crypto-payment environment.

## Known failure modes

- Payment failure: insufficient USDC balance or x402 protocol error results in 402 Payment Required
- Invalid path: unrecognized Alchemy API path returns upstream 404 or error
- Malformed JSON body: invalid RPC payload causes Alchemy upstream error
- Rate limiting: excessive calls may trigger upstream Alchemy rate limits
- Network error: Vercel or Alchemy infrastructure unavailability returns 5xx

## How this service works

Every request, a quantum of value. x402 protocol-based payment endpoint for web3/DeFi tools.

## Output

The raw upstream Alchemy Ethereum Mainnet API response body (JSON RPC result), passed through after successful x402 micropayment, including blockchain data such as balances, block details, transaction receipts, or smart contract query results.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "body": {
   "type": "string",
   "description": "Optional JSON body forwarded to POST requests."
  },
  "path": {
   "type": "string",
   "description": "Path below the selected upstream origin."
  },
  "query": {
   "type": "object"
  },
  "method": {
   "enum": [
    "GET",
    "POST"
   ],
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "description": "The upstream response body and content type are passed through after successful payment."
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/quantaflow-x402-api-gateway-alchemy-eth-mainnet-f2014678/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from quanta-roan.vercel.app](https://www.zero.xyz/host/quanta-roan.vercel.app/llms.txt)