# QuantaFlow x402 API Gateway — Alchemy Bob Mainnet

> QuantaFlow x402 API Gateway — Alchemy Bob 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 paid API requests to Alchemy Bob mainnet node via x402 micropayment protocol, charging $0.01 USDC per call

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/alchemy-bob-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-bob-mainnet-f88387e3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rkKJW93OwVVgVWS_BFg8U

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-bob-mainnet-f88387e3 -d '<json body>'
```

Example prompt: Using the QuantaFlow x402 gateway, query the Alchemy Bob mainnet node to get the current ETH balance for address 0xAbC123... — route the eth_getBalance call through the /api/service/alchemy-bob-mainnet path and pay the $0.01 USDC fee per request.

## When to prefer this

Choose this endpoint when you need pay-per-call access to Alchemy's Bob mainnet node without a long-term API key subscription, particularly in autonomous agent workflows where x402 micropayments are already integrated. Ideal for low-volume or sporadic blockchain queries on Bob mainnet where $0.01 USDC per call is acceptable and you want to avoid managing Alchemy credentials directly.

## Known failure modes

- Payment failure: insufficient USDC balance or x402 payment not accepted — gateway returns 402 Payment Required
- Invalid path: malformed or unsupported path below the upstream origin — upstream returns 400 or 404
- Upstream Alchemy node error: RPC method not found or invalid params — returns standard JSON-RPC error object
- Network timeout: Alchemy node or gateway unreachable — returns 502 or 504
- Rate limiting: excessive requests beyond allowed quota — returns 429 Too Many Requests

## 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 and content type from the Alchemy Bob mainnet node, passed through transparently after the $0.01 USDC x402 payment is verified. This includes standard JSON-RPC response payloads such as block data, account balances, contract call results, or transaction receipts.

## 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-bob-mainnet-f88387e3/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)