# QuantaFlow x402 API Gateway – Alchemy Robinhood Mainnet

> QuantaFlow x402 API Gateway – Alchemy Robinhood 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 2026-10-14).

Proxies paid API requests to the Alchemy Robinhood mainnet blockchain data endpoint via the x402 micropayment protocol at $0.01 USDC per call

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/alchemy-robinhood-mainnet?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-x402-api-gateway-alchemy-robinhood-mainnet-80c96890
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EMP1bZSwB6M40oB_usCeN

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-robinhood-mainnet-80c96890 -d '<json body>'
```

Example prompt: Look up the latest block on Alchemy Robinhood mainnet — use the x402 pay-per-call gateway, hit the /eth/v1/blocks/latest path with a GET method, and pay the $0.01 USDC fee automatically.

## When to prefer this

Choose this endpoint when you need pay-per-call access to Alchemy Robinhood mainnet blockchain data without committing to a subscription API key, and when your agent runtime supports the x402 micropayment protocol. It is ideal for infrequent or bursty on-chain queries where a flat monthly plan would be wasteful, or for autonomous agents that must autonomously pay for their own API consumption in USDC.

## Known failure modes

- Payment failure: insufficient USDC balance causes 402 Payment Required before the upstream call is made
- Invalid path: unrecognized upstream path returns an error from Alchemy
- Malformed body: invalid JSON in the body field causes upstream 400 Bad Request
- Rate limiting: upstream Alchemy node rejects the request due to throughput limits
- Network error: Vercel serverless timeout if upstream Alchemy node is slow or unreachable

## How this service works

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

## Output

The raw response body and content type returned by the upstream Alchemy Robinhood mainnet API, passed through transparently after the $0.01 USDC x402 payment is confirmed. No transformation is applied to the upstream payload.

## 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-robinhood-mainnet-80c96890/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)