# QuantaFlow x402 API Gateway — Alchemy Linea Mainnet

> QuantaFlow x402 API Gateway — Alchemy Linea 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 2026-10-11).

Proxies requests to Alchemy's Linea Mainnet JSON-RPC endpoint via the x402 micropayment protocol, charging $0.01 USDC per call.

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/alchemy-linea-mainnet?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-x402-api-gateway-alchemy-linea-mainnet-1e0d57f3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3A9hNsG0CerUQzBqIhdGA

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-linea-mainnet-1e0d57f3 -d '<json body>'
```

Example prompt: Check the current block number on Linea mainnet using Alchemy — forward a JSON-RPC eth_blockNumber call and pay the per-request fee automatically.

## When to prefer this

Choose this endpoint when you need pay-per-call access to Alchemy's Linea Mainnet RPC without managing an Alchemy API key subscription, and your agent supports the x402 micropayment protocol for automatic per-request USDC settlement.

## Known failure modes

- Payment failure — insufficient USDC balance or x402 payment not accepted, returns 402 Payment Required
- Invalid path — unsupported or malformed RPC path returns an upstream error
- Alchemy upstream error — Linea node unavailable or RPC method not supported returns 5xx or JSON-RPC error
- Malformed body — invalid JSON body causes upstream parse error
- Rate limit — Alchemy upstream rate limit exceeded returns 429

## How this service works

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

## Output

The raw upstream JSON-RPC response body from Alchemy's Linea Mainnet endpoint, passed through with its original content type after the $0.01 USDC x402 micropayment is settled.

## 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-linea-mainnet-1e0d57f3/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)