# QuantaFlow DuckDuckGo SERP Search

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

Performs a DuckDuckGo search engine results page (SERP) query via the x402 pay-per-call gateway and returns search results

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/serp-duckduckgo?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-duckduckgo-serp-search-90011666
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jneANR-dXs8-0w1H4AEp1

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-duckduckgo-serp-search-90011666 -d '<json body>'
```

Example prompt: Search DuckDuckGo for 'best open-source LLM frameworks 2024' and give me the top results including titles and URLs.

## When to prefer this

Choose this endpoint when you need privacy-respecting web search results via DuckDuckGo in a pay-per-call model with no subscription required; ideal for AI agents that make infrequent or burst searches and want to avoid API key management, or when operating in a web3/crypto-native environment where x402 micropayments are already integrated.

## Known failure modes

- Payment failure: insufficient USDC balance or invalid x402 payment header returns 402 Payment Required
- Invalid query parameters: malformed query object may yield empty or error results from upstream
- DuckDuckGo rate limiting: upstream may throttle or block requests returning error status
- Upstream unavailability: DuckDuckGo service downtime causes pass-through error
- Missing required path or query fields: gateway may return 400 Bad Request

## How this service works

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

## Output

Returns the upstream DuckDuckGo SERP response body (typically JSON or HTML depending on query parameters) including search result titles, URLs, and snippets, along with the content type header, after successful x402 micropayment of $0.01 USDC.

## 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-duckduckgo-serp-search-90011666/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)