Pay-per-call AI research agent via x402 on Base Sepolia, powered by Questflow
What it does
The Researcher endpoint is an x402-payable AI agent hosted by Questflow on their development API. It accepts a text prompt via HTTP POST and returns a text response from the agent. Payment is handled through the x402 protocol using USDC on the Base Sepolia testnet, with a maximum cost of 0.5 USDC per request and a timeout of up to 1200 seconds (20 minutes).
Questflow is a platform focused on autonomous AI agents ("Clones") that operate across onchain markets such as Polymarket, Pump.fun, OKX, and Opinion Labs. While the broader platform centers on trading, market scanning, and revenue generation, this specific endpoint is labeled "Researcher" and its exact research capabilities are not documented beyond the generic description. The input/output schema is simple: send a string message, receive a string response.
This is a development-tier endpoint (api-dev subdomain, Base Sepolia testnet) with no formal OpenAPI spec, no dedicated documentation page, and minimal metadata. The output schema provided in the x402 challenge is the only technical contract available. Prospective users should treat this as an experimental or pre-production service.
Capabilities
Use cases
- —Sending research questions to an AI agent and receiving text answers via a single API call
- —Integrating a pay-per-use AI researcher into an autonomous agent pipeline using x402
- —Testing x402 payment flows with a live agent endpoint on Base Sepolia
Fit
Best for
- —Developers experimenting with x402 payment-gated AI endpoints
- —Agent-to-agent workflows that need an on-demand research capability
- —Prototyping paid AI services on Base Sepolia testnet
Not for
- —Production workloads requiring guaranteed uptime and SLAs (this is a dev endpoint)
- —Users needing detailed documentation or structured output schemas beyond plain text
- —Mainnet payment flows (currently Base Sepolia testnet only)
Quick start
curl -X POST \
https://api-dev.intra-tls2.dctx.link/x402/swarm/qrn:swarm:68edf2c82c00f5ed07016cf2 \
-H 'Content-Type: application/json' \
-H 'X-PAYMENT: <x402_payment_header>' \
-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, modular lending protocols, and cross-chain liquidity aggregation..."
}Endpoint
Quality
No OpenAPI spec, no dedicated docs, no usage examples, and the endpoint is on a dev/testnet domain. The only technical detail comes from the x402 challenge's outputSchema. The agent's actual research capabilities are undocumented.
Warnings
- —Development endpoint (api-dev subdomain) — not production-ready
- —Uses Base Sepolia testnet USDC, not mainnet tokens
- —No formal API documentation or OpenAPI spec available
- —Agent capabilities ('Researcher') are not described beyond the name
- —Max timeout of 1200 seconds suggests potentially long response times
- —Example response is inferred, not sourced from actual API output
Citations
- —x402 challenge requires USDC payment on Base Sepolia with maxAmountRequired of 500000 and maxTimeoutSeconds of 1200https://api-dev.intra-tls2.dctx.link/x402/swarm/qrn:swarm:68edf2c82c00f5ed07016cf2
- —The endpoint description in the x402 challenge is 'Researcher | Powered by Questflow'https://api-dev.intra-tls2.dctx.link/x402/swarm/qrn:swarm:68edf2c82c00f5ed07016cf2
- —Questflow is a platform for AI Clones that aggregate onchain markets including Polymarket, Pump.fun, OKX, and Opinion Labshttps://api-dev.intra-tls2.dctx.link
- —Input schema accepts a string field 'input' and output returns a string field 'response'https://api-dev.intra-tls2.dctx.link/x402/swarm/qrn:swarm:68edf2c82c00f5ed07016cf2