# QuantaFlow x402 API Gateway — Alchemy Avalanche Mainnet

> QuantaFlow x402 API Gateway — Alchemy Avalanche 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 2026-10-23).

Proxies requests to the Alchemy Avalanche (AVAX) mainnet RPC/API endpoint via x402 micropayment-gated passthrough for $0.01 USDC per call.

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/alchemy-avax-mainnet?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-x402-api-gateway-alchemy-avalanche-mainnet-b1e9cb47
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WGkb3p5YF1FW5_IcwUaRf

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-avalanche-mainnet-b1e9cb47 -d '<json body>'
```

Example prompt: Query the latest block number on Avalanche C-Chain mainnet through Alchemy — forward a POST to the eth_blockNumber RPC method and pay the $0.01 USDC fee per call.

## When to prefer this

Choose this endpoint when you need pay-per-call access to Alchemy's Avalanche C-Chain mainnet APIs without a subscription or API key, using x402 USDC micropayments. Ideal for agents that make occasional blockchain queries and want to avoid API key management overhead. Prefer over direct Alchemy access when operating in a web3-native, wallet-based payment context.

## Known failure modes

- Payment failure: insufficient USDC balance or x402 payment not accepted returns a 402 error
- Invalid path: if the upstream path is malformed or unsupported by Alchemy, the upstream error is proxied back
- Network error: Alchemy upstream downtime results in a gateway timeout or 5xx error
- Invalid method or body: malformed JSON-RPC body forwarded to Alchemy returns an RPC error response
- Rate limiting: Alchemy upstream rate limits may result in 429 errors being proxied through

## How this service works

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

## Output

The raw upstream response body from Alchemy's Avalanche mainnet API is passed through verbatim along with its content type, after the $0.01 USDC x402 micropayment is processed. This may be a JSON-RPC result, enhanced API payload, or error object depending on the upstream 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-avalanche-mainnet-b1e9cb47/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)