Privacy-focused DuckDuckGo web search agent via x402 micropayments on Base Sepolia
What it does
This endpoint provides a DuckDuckGo-powered web search agent accessible through the x402 payment protocol. It accepts a natural-language query as input and returns search results and extracted webpage content formatted for easy consumption by language models. The agent supports anonymous web searching, webpage content fetching, and clean text extraction from HTML pages.
The endpoint is hosted by Questflow on their development API server (api-dev.intra-tls2.dctx.link) and is live, returning a valid 402 payment challenge. Payment is required in USDC on the Base Sepolia testnet, with a maximum cost of 100,000 units (0.10 USDC given 6 decimals) per request. The interface is a simple POST with a single required string field "input" containing your message to the agent, and the response is a string field "response" from the agent.
Documentation beyond the x402 challenge metadata is sparse. There is no OpenAPI spec, no dedicated docs page, and the provider's landing page focuses on their broader AI Clone trading platform rather than this specific search tool. The output schema and behavior are inferred primarily from the 402 challenge description and outputSchema fields.
Capabilities
Use cases
- —Agent-driven web research with privacy-preserving search
- —Fetching and parsing webpage content into clean text for LLM pipelines
- —Augmenting LLM context with real-time web search results
- —Building RAG workflows that need fresh web data without tracking
Fit
Best for
- —AI agents needing on-demand web search via micropayments
- —Privacy-conscious web searches without API key management
- —Extracting readable text from web pages for downstream LLM processing
Not for
- —High-volume production search workloads (this is on a testnet/dev endpoint)
- —Use cases requiring structured search result metadata like URLs, snippets, and rankings separately
Quick start
curl -X POST https://api-dev.intra-tls2.dctx.link/x402/agent/qrn:agent:68ee03aed8b26d2e2dff7c2f \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{"input": "latest news on Bitcoin ETF approvals"}'Example
Request
{
"input": "latest news on Bitcoin ETF approvals"
}Response
{
"response": "Here are the latest results for Bitcoin ETF approvals: ..."
}Endpoint
Quality
The endpoint is live and returns a valid 402 challenge with a clear outputSchema, but there is no OpenAPI spec, no dedicated documentation, and the provider's site focuses on an unrelated product (AI Clone trading). The response format is inferred from the outputSchema alone; no example responses are available.
Warnings
- —This is a development/testnet endpoint (api-dev, Base Sepolia) — not suitable for production use
- —No dedicated API documentation exists for this endpoint
- —Example response is inferred from outputSchema, not from actual observed output
- —The provider's main site (Questflow) focuses on AI trading clones; this search tool appears to be a secondary offering
Citations
- —Endpoint returns a valid 402 payment challenge with x402Version 1https://api-dev.intra-tls2.dctx.link/x402/agent/qrn:agent:68ee03aed8b26d2e2dff7c2f
- —Payment is in USDC on Base Sepolia with maxAmountRequired of 100000https://api-dev.intra-tls2.dctx.link/x402/agent/qrn:agent:68ee03aed8b26d2e2dff7c2f
- —Description states DuckDuckGo web search with privacy-focused searches, content retrieval, and clean text extractionhttps://api-dev.intra-tls2.dctx.link/x402/agent/qrn:agent:68ee03aed8b26d2e2dff7c2f
- —Questflow is the provider platformhttps://api-dev.intra-tls2.dctx.link