# QuantaFlow x402 API Gateway – Alchemy BNB Mainnet

> QuantaFlow x402 API Gateway – Alchemy BNB 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 Alchemy's BNB Chain mainnet node API via x402 micropayment protocol, charging $0.01 USDC per call

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/alchemy-bnb-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-bnb-mainnet-92c7cf1b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_g5YEd68Lk5P40IpyvUiM-

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-bnb-mainnet-92c7cf1b -d '<json body>'
```

Example prompt: Use the Alchemy BNB mainnet gateway to get the latest block number on BNB Chain — route the eth_blockNumber JSON-RPC call through the /api/service/alchemy-bnb-mainnet path.

## When to prefer this

Choose this endpoint when you need pay-per-use access to Alchemy's BNB Chain mainnet node without managing Alchemy API keys or subscriptions. Ideal for agents that need sporadic or low-volume BNB Chain RPC calls billed via x402 USDC micropayments. Prefer this over self-managed Alchemy keys when cost predictability per call ($0.01 USDC) matters or when operating in a wallet-native agent environment. Not suitable for high-frequency or batch RPC workloads where a direct Alchemy subscription would be more economical.

## Known failure modes

- Insufficient USDC balance or failed x402 payment — payment authorization rejected, request not forwarded
- Invalid or malformed JSON-RPC body — upstream Alchemy returns JSON-RPC error
- Unsupported RPC method — Alchemy may reject methods not available on BNB mainnet
- Incorrect path parameter — upstream routing fails with 404
- Alchemy rate limit or node unavailability — upstream 429 or 503 passed through
- Network timeout on BNB Chain node — slow or unresponsive upstream

## How this service works

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

## Output

The raw upstream Alchemy BNB Chain mainnet API response body is passed through after successful x402 micropayment verification — this includes standard JSON-RPC blockchain data such as block info, transaction receipts, account balances, contract call results, and other on-chain data in Alchemy's standard response format.

## 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-bnb-mainnet-92c7cf1b/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)