# QuantaFlow x402 API Gateway — Alchemy Base Mainnet

> QuantaFlow x402 API Gateway — Alchemy Base 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 2026-10-10).

Proxies requests to Alchemy's Base mainnet RPC/API endpoints via the x402 micropayment protocol, charging $0.01 USDC per call.

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/alchemy-base-mainnet?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-x402-api-gateway-alchemy-base-mainnet-0c63c5e4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WwJ6eqjM4koE86o5QmcaW

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-base-mainnet-0c63c5e4 -d '<json body>'
```

Example prompt: Using the QuantaFlow gateway, query Alchemy's Base mainnet to get the current ETH balance for wallet address 0xAbC...123 — send a POST with path /v2/getBalance and the address in the body.

## When to prefer this

Choose this endpoint when you need pay-per-call access to Alchemy's Base mainnet APIs without a pre-provisioned API key, using the x402 micropayment protocol for frictionless on-chain billing at $0.01 per request. It is ideal for agents that need occasional or bursty access to Base mainnet blockchain data (balances, transactions, contract calls) without managing API subscriptions.

## Known failure modes

- Payment failure: x402 payment not accepted or insufficient USDC balance — gateway returns 402 Payment Required
- Invalid path: requested path not available on Alchemy Base mainnet — returns upstream 404 or error
- Malformed body: invalid JSON in body field — upstream returns 400 Bad Request
- Rate limiting: Alchemy upstream rate limit exceeded — returns 429 Too Many Requests
- Network error: Base mainnet RPC node unavailable — returns 503 or upstream timeout

## 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 mainnet API is passed through as-is, including the response body and content type. This may be JSON-RPC results, token balances, transaction data, NFT metadata, or any other Alchemy Enhanced API response depending on the path called.

## 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-base-mainnet-0c63c5e4/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)