Deep web search agent powered by Google Gemini, payable per-request via x402 on Base.
What it does
This Questflow-hosted agent performs deep web searches using the Google Gemini model. It is accessible as an x402 endpoint, meaning callers pay per request using USDC on the Base network. The endpoint accepts a POST request with a simple JSON body containing an `input` string (your search query) and returns a `response` string with the agent's answer.
Payment is handled via the x402 protocol: the endpoint returns a 402 challenge requiring an `X-PAYMENT` header with a payment proof. The maximum amount required per call is 100,000 units of USDC (0.10 USDC given 6 decimals), and the maximum timeout for a response is 1,200 seconds (20 minutes), reflecting the potentially long-running nature of deep search tasks.
Questflow is a platform focused on autonomous AI agents for onchain markets and information retrieval. This particular agent is identified by the QRN `qrn:agent:687df69ab234010b7d3317e5`. No OpenAPI spec or detailed API documentation was found beyond the x402 challenge schema itself, so usage details are inferred from the challenge payload.
Capabilities
Use cases
- —Performing comprehensive web research queries from an AI agent pipeline
- —Retrieving up-to-date information from the web via a pay-per-use API
- —Augmenting LLM workflows with grounded web search results
- —Automated fact-checking or information gathering tasks
Fit
Best for
- —Agents needing on-demand deep web search without API key management
- —x402-native workflows that pay per call with USDC on Base
- —Research tasks requiring Gemini-powered synthesis of web results
Not for
- —High-frequency, low-latency search queries (max timeout is 20 minutes)
- —Users who need free or subscription-based search APIs
- —Use cases requiring structured search result metadata (URLs, snippets) rather than synthesized text
Quick start
curl -X POST https://api.questflow.ai/x402/agent/qrn:agent:687df69ab234010b7d3317e5 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>" \
-d '{"input": "What are the latest developments in AI regulation?"}'Example
Request
{
"input": "What are the latest developments in AI regulation?"
}Response
{
"response": "As of mid-2025, several key developments in AI regulation include the EU AI Act entering enforcement phases, the US executive order on AI safety being implemented across federal agencies, and China releasing updated generative AI service regulations..."
}Endpoint
Quality
The endpoint is live with a valid 402 challenge and includes an outputSchema describing input/output fields. However, there is no OpenAPI spec, no dedicated documentation, and no usage examples beyond what can be inferred from the challenge payload. The response format is inferred, not confirmed.
Warnings
- —No OpenAPI or dedicated API documentation found
- —Response format is inferred from the x402 outputSchema, not from actual response samples
- —Max timeout of 1200 seconds suggests potentially very long response times
- —No rate limits or usage quotas documented
Citations
- —Endpoint returns 402 with x402 challenge requiring X-PAYMENT header and USDC on Base networkhttps://api.questflow.ai/x402/agent/qrn:agent:687df69ab234010b7d3317e5
- —Description states: Can perform deep search on the web using Google Gemini modelhttps://api.questflow.ai/x402/agent/qrn:agent:687df69ab234010b7d3317e5
- —maxAmountRequired is 100000 units of USDC asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://api.questflow.ai/x402/agent/qrn:agent:687df69ab234010b7d3317e5
- —Questflow is a platform for autonomous AI agents focused on onchain marketshttps://api.questflow.ai