Pay-per-call AI agent swarm endpoint on Questflow via x402 micropayments on Base
What it does
This endpoint exposes a Questflow "swarm" agent accessible via the x402 payment protocol on the Base network. Callers send a POST request with a text message in the `input` field and receive a text `response` from the agent. Payment is handled through an X-PAYMENT header using USDC (asset 0x8335…2913) on Base, with a maximum charge of 0.50 USDC per call (500000 in 6-decimal units) and a timeout of up to 1200 seconds.
Questflow is a platform for creating autonomous AI "clones" that scan and trade across on-chain markets such as Polymarket, Pump.fun, OKX, and Opinion Labs. The specific swarm behind this endpoint (ID qrn:swarm:68dec75db36f34e392f8b90f) has a minimal description ("Hello"), so its exact capabilities, persona, or domain specialization are unknown. The endpoint is discoverable and live, returning a proper x402 challenge when called without payment.
Because there is no OpenAPI spec, no dedicated documentation page, and only a one-word description for this particular swarm, consumers should treat this as an exploratory or experimental endpoint. The input/output schema is simple: one string in, one string out. There is no information about rate limits, SLA, or content moderation policies.
Capabilities
Use cases
- —Sending ad-hoc queries to an autonomous AI agent swarm and paying per call with USDC on Base
- —Integrating an AI agent into a crypto trading workflow via x402 micropayments
- —Programmatically interacting with Questflow swarm agents from other AI agents or scripts
Fit
Best for
- —Developers experimenting with x402 payment-gated AI endpoints
- —Agent-to-agent communication where USDC micropayments are acceptable
- —Quick prototyping of pay-per-call AI chat integrations on Base
Not for
- —Production workloads requiring documented SLAs, rate limits, or guaranteed uptime
- —Users who need detailed knowledge of the agent's domain expertise before calling
- —Free or high-volume chat use cases where per-call USDC payments are impractical
Quick start
curl -X POST https://api.questflow.ai/x402/swarm/qrn:swarm:68dec75db36f34e392f8b90f \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <your-x402-payment-token>" \
-d '{"input": "What markets are trending today?"}'Example
Request
{
"input": "What markets are trending today?"
}Response
{
"response": "Currently trending: Polymarket US election markets are seeing high volume, and several new meme tokens launched on Pump.fun in the last hour."
}Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with a basic input/output schema, but there is no OpenAPI spec, no documentation, no meaningful description of the swarm's capabilities, and no pricing page or rate-limit info. The listing is largely inferred from the x402 challenge metadata and the Questflow homepage.
Warnings
- —No OpenAPI or dedicated API documentation available
- —Swarm description is only 'Hello' — agent capabilities are completely unknown
- —No rate limits, SLA, or content moderation policies documented
- —Example response is fabricated to illustrate the schema; actual output is unknown
- —Maximum cost per call is 0.50 USDC but actual charges may vary
Citations
- —Payment is in USDC on Base with maxAmountRequired of 500000 (0.50 USDC) and maxTimeoutSeconds of 1200https://api.questflow.ai/x402/swarm/qrn:swarm:68dec75db36f34e392f8b90f
- —Questflow aggregates Polymarket, Pump.fun, Opinion Labs, OKX and other on-chain marketshttps://api.questflow.ai
- —The endpoint accepts POST with an 'input' string field and returns a 'response' string fieldhttps://api.questflow.ai/x402/swarm/qrn:swarm:68dec75db36f34e392f8b90f
- —Pay-to address is 0x42Fb3945A122E913191E7a81c9b28D1A4e9ba13e and USDC asset is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://api.questflow.ai/x402/swarm/qrn:swarm:68dec75db36f34e392f8b90f