x402-payable research agent that accepts a text prompt and returns an AI-generated response, paid per-call in USDC on Base Sepolia.
What it does
The Researcher endpoint is an x402-enabled AI agent hosted by Questflow. It accepts a POST request containing a free-text input message and returns a string response from the agent. Payment is handled via the x402 protocol using USDC on the Base Sepolia testnet, with a maximum charge of 0.50 USDC per request (500000 in token units, assuming 6-decimal USDC). The endpoint supports a maximum timeout of 1200 seconds (20 minutes), suggesting the agent may perform non-trivial research or multi-step reasoning before responding.
Questflow's broader platform focuses on autonomous AI "clones" that aggregate onchain markets (Polymarket, Pump.fun, OKX, Opinion Labs) for trading, signal generation, and research. The Researcher agent appears to be one such agent exposed as a pay-per-call API. However, no detailed documentation, OpenAPI spec, or usage examples are published for this specific endpoint. The only schema information available comes from the x402 challenge response, which defines a single required input field ("input": string) and a single output field ("response": string).
Because this endpoint is on Base Sepolia (a testnet), it is likely intended for development and testing rather than production use. There is no published rate-limit information, SLA, or detailed description of what kind of research the agent performs.
Capabilities
Use cases
- —Sending a research question and receiving an AI-generated answer via a single API call
- —Integrating a paid AI research agent into an autonomous agent pipeline
- —Testing x402 payment flows with a live AI agent on Base Sepolia
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agent-to-agent workflows needing a research capability behind a paywall
- —Prototyping pay-per-call AI services on testnet
Not for
- —Production workloads requiring mainnet settlement and SLAs
- —Users needing structured or schema-rich research outputs
- —Latency-sensitive applications (up to 20-minute timeout)
Quick start
curl -X POST \
https://api-dev.intra-tls2.dctx.link/x402/swarm/qrn:swarm:68f1ec6d40f924c075ec7a08 \
-H 'Content-Type: application/json' \
-H 'X-PAYMENT: <x402_payment_token>' \
-d '{"input": "What are the latest trends in DeFi lending?"}'Example
Request
{
"input": "What are the latest trends in DeFi lending?"
}Response
{
"response": "Recent trends in DeFi lending include the rise of real-world asset (RWA) collateralization, cross-chain lending protocols, and dynamic interest rate models driven by AI-based risk assessment."
}Endpoint
Quality
No OpenAPI spec, no documentation pages (all return 404), no usage examples, and the endpoint runs on a testnet. The only schema information comes from the x402 challenge payload. The agent's actual research capabilities and scope are entirely undocumented.
Warnings
- —Endpoint is on Base Sepolia testnet — not suitable for production use
- —No published documentation, OpenAPI spec, or usage guides
- —Agent behavior and research scope are undocumented; response quality is unknown
- —Example response JSON is entirely inferred/fabricated for illustration
- —maxAmountRequired of 500000 assumes 6-decimal USDC (~$0.50) but this is not explicitly confirmed
Citations
- —Payment is via USDC on Base Sepolia with maxAmountRequired of 500000 and maxTimeoutSeconds of 1200https://api-dev.intra-tls2.dctx.link/x402/swarm/qrn:swarm:68f1ec6d40f924c075ec7a08
- —The input schema requires a single string field 'input' and returns a single string field 'response'https://api-dev.intra-tls2.dctx.link/x402/swarm/qrn:swarm:68f1ec6d40f924c075ec7a08
- —Questflow platform aggregates Polymarket, Pump.fun, OKX, and Opinion Labs marketshttps://api-dev.intra-tls2.dctx.link
- —Description from x402 challenge: 'Researcher | Powered by Questflow'https://api-dev.intra-tls2.dctx.link/x402/swarm/qrn:swarm:68f1ec6d40f924c075ec7a08