{"id":"35daf77e-fbf5-42cf-80c3-8b2976490e47","shortId":"wkGgjz","kind":"x402","title":"Pay-per-call AI research agent on Base Sepolia via x402, powered by Questflow","tagline":"Pay-per-call AI research agent on Base Sepolia via x402, powered by Questflow","description":"Researcher is an x402-payable AI agent endpoint hosted by Questflow. It accepts a text prompt via HTTP POST and returns a text response from an AI research agent. Payment is handled through the x402 protocol on the Base Sepolia testnet using USDC (contract 0x036CbD53842c5426634e7929541eC2318f3dCF7e), with a maximum cost of 0.5 USDC per request (500000 in token units, assuming 6 decimals).\n\nThe endpoint follows the x402 exact-payment scheme: callers must include an X-PAYMENT header with a valid payment proof. The request body takes a single required field, `input` (string), which is your message to the agent. The response returns a `response` field (string) containing the agent's reply. The maximum timeout is 1200 seconds (20 minutes), suggesting the agent may perform non-trivial research or multi-step reasoning before responding.\n\nQuestflow, the platform behind this endpoint, describes itself as an AI agent economy platform that aggregates onchain markets (Polymarket, Pump.fun, OKX, Opinion Labs) and provides autonomous AI agents. However, the specific capabilities and knowledge domain of this particular \"Researcher\" agent are not documented beyond the generic description. There is no OpenAPI spec, no dedicated documentation page, and no usage examples provided by the host. The endpoint is on a development subdomain (api-dev), indicating it may be a staging or testnet deployment rather than a production service.","tags":[],"capabilities":["x402-payment","ai-agent","text-generation","research-agent","base-sepolia","usdc-payment","http-post"],"categories":["llm","crypto"],"synonyms":["AI researcher","research agent","Questflow researcher","x402 AI agent","pay-per-query AI","crypto research bot","onchain research agent"],"warnings":["Endpoint is on a development subdomain (api-dev), suggesting staging/testnet rather than production","Uses Base Sepolia testnet — not mainnet; USDC is testnet USDC","No OpenAPI spec or documentation available; /docs, /api, /pricing, /README all return 404","Agent capabilities and knowledge domain are undocumented beyond the name 'Researcher'","20-minute max timeout may indicate slow or unpredictable response times","Response format inferred from x402 outputSchema only; no real response samples available"],"endpointUrl":"https://api-dev.intra-tls2.dctx.link/x402/swarm/qrn:swarm:68e8b14c3c3d5114bcb07b2c","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x036CbD53842c5426634e7929541eC2318f3dCF7e","extra":{"name":"USDC","version":"2"},"payTo":"0xb5db01C853dE3cdA4FFDD24Be601134964238280","scheme":"exact","network":"base-sepolia","mimeType":"application/json","resource":"https://api-dev.intra-tls2.dctx.link/x402/swarm/qrn:swarm:68e8b14c3c3d5114bcb07b2c","description":"Researcher | Powered by Questflow","outputSchema":{"input":{"type":"http","method":"POST","bodyFields":{"input":{"type":"string","required":true,"description":"Your message to the agent"}},"discoverable":true},"output":{"response":{"type":"string","required":true,"description":"Response from the agent"}}},"maxAmountRequired":"500000","maxTimeoutSeconds":1200}]},"qualityScore":"0.300","qualityRationale":"No OpenAPI spec, no documentation pages, no usage examples, and the endpoint is on a dev subdomain. The only structured information comes from the x402 challenge payload, which provides a minimal input/output schema. The agent's actual research capabilities and knowledge domain are entirely 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agent' 'openapi':218 'opinion':189 'page':223 'particular':205 'pay':2,17 'pay-per-cal':1,16 'pay-per-query AI' 'payabl':36 'payment':61,100,108,113 'per':3,18,84 'perform':156 'platform':170,181 'polymarket':186 'post':50 'power':13,28 'product':254 'prompt':47 'proof':114 'protocol':67 'provid':192,228 'pump.fun':187 'questflow':15,30,42,168 'rather':251 'reason':165 'repli':143 'request':85,116 'requir':121 'research':6,21,31,59,160,206 'research agent' 'research-agent' 'respond':167 'respons':55,133,136 'return':52,134 'scheme':101 'second':149 'sepolia':10,25,71 'servic':255 'singl':120 'spec':219 'specif':198 'stage':247 'step':164 'string':124,138 'subdomain':238 'suggest':152 'take':118 'testnet':72,249 'text':46,54 'text-generation' 'timeout':146 'token':88 'trivial':159 'unit':89 'usag':226 'usdc':74,83 'usdc-payment' 'use':73 'valid':112 'via':11,26,48 'x':107 'x-payment':106 'x402':12,27,35,66,97 'x402 AI agent' 'x402-payable':34 'x402-payment'","prices":[{"id":"6f74110b-f057-4859-8140-7d708a996318","listingId":"35daf77e-fbf5-42cf-80c3-8b2976490e47","amountUsd":null,"unit":"per_call","nativeCurrency":"USDC","nativeAmount":"500000","chain":"base-sepolia","payTo":"0xb5db01C853dE3cdA4FFDD24Be601134964238280","paymentMethod":"x402-usdc","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x036CbD53842c5426634e7929541eC2318f3dCF7e","extra":{"name":"USDC","version":"2"},"payTo":"0xb5db01C853dE3cdA4FFDD24Be601134964238280","scheme":"exact","network":"base-sepolia","mimeType":"application/json","resource":"https://api-dev.intra-tls2.dctx.link/x402/swarm/qrn:swarm:68e8b14c3c3d5114bcb07b2c","description":"Researcher | Powered by Questflow","outputSchema":{"input":{"type":"http","method":"POST","bodyFields":{"input":{"type":"string","required":true,"description":"Your message to the agent"}},"discoverable":true},"output":{"response":{"type":"string","required":true,"description":"Response from the agent"}}},"maxAmountRequired":"500000","maxTimeoutSeconds":1200}],"asset_contract":"0x036CbD53842c5426634e7929541eC2318f3dCF7e","max_timeout_seconds":1200},"createdAt":"2026-04-18T18:30:42.998Z"}],"sources":[{"listingId":"35daf77e-fbf5-42cf-80c3-8b2976490e47","source":"x402_bazaar","sourceId":"https://api-dev.intra-tls2.dctx.link/x402/swarm/qrn:swarm:68e8b14c3c3d5114bcb07b2c","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:30:42.998Z","lastSeenAt":"2026-04-22T06:01:02.423Z"}],"details":{"listingId":"35daf77e-fbf5-42cf-80c3-8b2976490e47","quickStartSnippet":"curl -X POST https://api-dev.intra-tls2.dctx.link/x402/swarm/qrn:swarm:68e8b14c3c3d5114bcb07b2c \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{\"input\": \"What are the latest trends in DeFi lending?\"}'","exampleRequest":{"input":"What are the latest trends in DeFi lending?"},"exampleResponse":{"response":"Recent trends in DeFi lending include the rise of real-world asset (RWA) collateralization, modular lending protocols, and cross-chain lending markets..."},"schema":{"input":{"type":"http","method":"POST","bodyFields":{"input":{"type":"string","required":true,"description":"Your message to the agent"}},"discoverable":true},"output":{"response":{"type":"string","required":true,"description":"Response from the agent"}}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"x402 challenge specifies Base Sepolia network, USDC asset 0x036CbD53842c5426634e7929541eC2318f3dCF7e, maxAmountRequired 500000, maxTimeoutSeconds 1200","source_url":"https://api-dev.intra-tls2.dctx.link/x402/swarm/qrn:swarm:68e8b14c3c3d5114bcb07b2c"},{"claim":"Input schema requires a string field 'input' and output returns a string field 'response'","source_url":"https://api-dev.intra-tls2.dctx.link/x402/swarm/qrn:swarm:68e8b14c3c3d5114bcb07b2c"},{"claim":"Questflow describes itself as an AI agent economy platform aggregating Polymarket, Pump.fun, OKX, and Opinion Labs","source_url":"https://api-dev.intra-tls2.dctx.link"},{"claim":"Payment address is 0xb5db01C853dE3cdA4FFDD24Be601134964238280","source_url":"https://api-dev.intra-tls2.dctx.link/x402/swarm/qrn:swarm:68e8b14c3c3d5114bcb07b2c"}],"useCases":["Querying an AI research agent for information or analysis via a single text prompt","Integrating a pay-per-call AI agent into an automated pipeline using x402 micropayments","Testing x402 payment flows on Base Sepolia testnet with a functional AI endpoint"],"bestFor":["Developers experimenting with x402 protocol integration","Agents needing on-demand AI research responses with crypto micropayments","Prototyping pay-per-use AI agent workflows on testnet"],"notFor":["Production workloads requiring guaranteed uptime (this is a dev/testnet endpoint)","Users needing detailed documentation or predictable response formats","Bulk or low-latency queries (20-minute max timeout suggests potentially slow responses)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:25.221Z"},"updatedAt":"2026-04-22T06:01:02.423Z"}}