# QuantaFlow x402 Etherscan API Gateway

> QuantaFlow x402 Etherscan API Gateway is a paid API for AI agents from quanta-roan.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-16).

Proxies requests to the Etherscan API via an x402 micropayment-gated gateway for blockchain data lookups

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/etherscan?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-x402-etherscan-api-gateway-74f9d88d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2ZYDC5ED75d0ea07CDK9j

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-etherscan-api-gateway-74f9d88d -d '<json body>'
```

Example prompt: Can you pull the transaction history for Ethereum wallet 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B from Etherscan — I want to see all outgoing ETH transfers in the last 100 transactions.

## When to prefer this

Use this endpoint when you need Etherscan blockchain data and want to pay per-call via x402 micropayments without managing a traditional Etherscan API key subscription. Ideal for agents that need on-demand, low-volume Ethereum data lookups in a web3-native payment context.

## Known failure modes

- Payment failure: insufficient USDC balance causes 402 Payment Required response
- Invalid Etherscan path: malformed path parameter returns upstream 400 or 404 error
- Rate limit exceeded: Etherscan upstream rate limiting causes 429 responses
- Invalid address format: passing a malformed Ethereum address returns Etherscan error response
- Network issues: upstream Etherscan API unavailability causes timeout or 5xx errors

## How this service works

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

## Output

The raw upstream Etherscan API response is passed through after the x402 micropayment is processed — typically JSON containing blockchain data such as account balances, transaction lists, token transfers, contract ABIs, gas estimates, or block details depending on the queried path.

## 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-etherscan-api-gateway-74f9d88d/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)