# QuantaFlow x402 API Gateway – Alchemy Soneium Mainnet

> QuantaFlow x402 API Gateway – Alchemy Soneium 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 requests to the Alchemy Soneium Mainnet RPC/API via a pay-per-call x402 micropayment gateway at $0.01 USDC per request

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/alchemy-soneium-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-soneium-mainnet-031e2e4d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vO2UgWNqa8I8VX_jL6gZD

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-soneium-mainnet-031e2e4d -d '<json body>'
```

Example prompt: Can you check the latest block number on Soneium mainnet using Alchemy — just proxy a POST to the eth_blockNumber RPC method with an empty params array and pay the $0.01 per-call fee?

## When to prefer this

Choose this endpoint when you need pay-per-call access to Alchemy's Soneium Mainnet APIs without managing an Alchemy API key or subscription, particularly useful for agents that make infrequent or variable-volume blockchain queries and want to pay only $0.01 USDC per call via the x402 protocol. Prefer it over direct Alchemy access when operating in a web3-native, wallet-based payment context.

## Known failure modes

- Payment failure: insufficient USDC balance causes 402 response before proxying occurs
- Invalid path: unrecognized Alchemy endpoint path returns upstream 404 or error
- Malformed JSON body: invalid RPC payload causes Alchemy to return a JSON-RPC error
- Network/upstream error: Alchemy node unavailable returns 502 or 503
- Rate limit: Alchemy upstream quota 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 response body from Alchemy's Soneium Mainnet node, passed through transparently with its original content type (typically JSON-RPC response with result or error fields), after successful x402 micropayment deduction.

## 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-soneium-mainnet-031e2e4d/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)