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serp402 Duck AI
x402
serp402 Duck AI is a paid API for AI agents from serp402.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-31).
Query DuckDuckGo's AI chat interface and receive AI-generated answers as structured JSON, with support for multi-turn conversations.
Price / call$0.05
Success—
StatusUnknown
How this service works
Duck AI: Duck AI results, returned as JSON. Structured JSON, USD 0.05 per call in USDC — no API key, no account, no subscription, no minimum. Not affiliated with, endorsed by or an official channel of any of the services the results come from. All trademarks and copyright remain the property of their respective owners.
Output
A structured JSON object containing the AI-generated answer text from DuckDuckGo's Duck AI, the model used, and a subsequent_request_token that can be passed with a new prompt to continue the conversation in the same thread.
Example use cases
Instant AI answers without credentials
“Use Duck AI with the gpt-5.4-mini model to answer: 'What are the pros and cons of solar panels for residential homes?' — I don't have an OpenAI key and need the result as JSON.”
Multi-turn research conversation
“Continue my Duck AI conversation using the token I got from the last call, and ask as a follow-up: 'Can you give me three specific examples from what you just described?' Use the claude-haiku-4-5 model.”
AI-powered content summarization
“Send this to Duck AI using gpt-5.6-luna: 'Summarize the key arguments for and against universal basic income in 5 bullet points.' Return the JSON answer.”
Technical details
Endpoint
POSThttps://serp402.com/api/v1/duck-ai?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need AI-generated answers without holding API keys for OpenAI or Anthropic, want to leverage DuckDuckGo's AI chat interface programmatically, need multi-turn conversation support, or want to pay per-call with USDC rather than maintaining a subscription. Especially useful for agents needing quick AI answers at low cost without account setup.
Side effects
- Invalid or unsupported model name returns an error
- Expired or invalid subsequent_request_token breaks conversation continuity
- Empty or malformed query string may return an error or empty response
- Rate limiting or upstream DuckDuckGo unavailability may cause failures
- Payment of 0.05 USDC not fulfilled results in 402 rejection
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| q | string | |
| model | string | AI model that answers the prompt. It can be set to: gpt-5.6-luna - GPT-5.6 Luna gpt-6-luna - GPT-6 Luna gpt-5.4-mini - GPT-5.4 mini claude-haiku-4-5 - Claude… |
| subsequent_request_token | string | token used to continue a Duck AI conversation. Pass this token with a new q to send a follow-up prompt that includes the previous prompts and answers as… |
Tags
x402
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