Exa search agent accessible via x402 micropayment on Questflow
What it does
This endpoint exposes an Exa-powered search agent hosted on the Questflow platform, payable via the x402 protocol on the Base network using USDC. You send a natural-language query as a POST body and receive a text response from the agent. Payment is handled through the X-PAYMENT header with an "exact" scheme, with a maximum cost of 100,000 units of USDC (6-decimal token, so up to $0.10 per request) paid to the specified address.
Questflow is a platform for creating and monetizing AI "Clones" — autonomous agents that scan markets, execute trades, and sell signals. This particular agent is labeled as an Exa search agent, though the only documented interface is a single POST endpoint accepting a free-text `input` string and returning a `response` string. No OpenAPI spec, detailed documentation, or usage examples are provided by the host. The output schema from the x402 challenge is minimal: one input field and one output field, both strings.
Because there is no dedicated documentation, no example responses, and no formal API spec beyond the x402 challenge metadata, the exact capabilities and quality of search results are unknown. Prospective callers should treat this as a lightly-documented agent endpoint and test with small queries before relying on it in production workflows.
Capabilities
Use cases
- —Performing web searches via a pay-per-request agent without API keys
- —Integrating semantic search into an autonomous agent pipeline
- —Querying Exa search results through an x402-compatible payment flow
Fit
Best for
- —Developers experimenting with x402 micropayment protocols
- —Agent-to-agent workflows needing on-demand web search
- —Quick semantic search queries paid in USDC on Base
Not for
- —High-volume search workloads requiring documented SLAs and rate limits
- —Users who need detailed search result metadata (URLs, snippets, scores)
- —Applications requiring a well-documented, versioned API
Quick start
curl -X POST https://api.questflow.ai/x402/agent/qrn:agent:68c1822e6a9ddcc1ed886747 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>" \
-d '{"input": "latest developments in AI search engines"}'Example
Request
{
"input": "latest developments in AI search engines"
}Response
{
"response": "Here are the latest developments in AI search engines: ..."
}Endpoint
Quality
Only the x402 challenge metadata is available; there is no OpenAPI spec, no documentation page, no example responses, and no pricing page. The input/output schema is a single string in and string out. Almost everything beyond the payment mechanics must be inferred.
Warnings
- —No OpenAPI or formal API documentation found — /docs, /api, /pricing, /README all return 404
- —Output format and search result structure are completely undocumented
- —The example response is fabricated to match the minimal schema; actual output is unknown
- —maxAmountRequired of 100000 in USDC (6 decimals) implies $0.10 max per call, but this is inferred from token decimals and not explicitly confirmed
- —Agent behavior and Exa integration details are not verifiable from available sources
Citations
- —x402 challenge returns maxAmountRequired of 100000 USDC on Base network with exact schemehttps://api.questflow.ai/x402/agent/qrn:agent:68c1822e6a9ddcc1ed886747
- —Description from x402 challenge: 'Exa is building a perfect search engine. | Powered by Questflow'https://api.questflow.ai/x402/agent/qrn:agent:68c1822e6a9ddcc1ed886747
- —Questflow is a platform for AI Clones that scan markets, execute trades, and earn revenuehttps://api.questflow.ai