{"id":"461bbc9a-2180-47f6-a769-4de222692529","shortId":"gV8DcB","kind":"x402","title":"AI crypto trading assistant answering market, trading, and blockchain questions via x402 micropayments","tagline":"AI crypto trading assistant answering market, trading, and blockchain questions via x402 micropayments","description":"GigaBrain Brain-Chat is a pay-per-request AI endpoint that answers questions about crypto trading, market analysis, and blockchain topics. It accepts a natural-language message and optionally a wallet address for personalized responses. The endpoint supports streaming output.\n\nThe service is accessed via the x402 payment protocol on the Base network, charging up to 0.50 USDC per request (maxAmountRequired of 500000 in 6-decimal USDC units). Payments are made to address 0xC82711a2Eef450704447D5596ff27F4DB971e165 using the USDC contract on Base (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).\n\nNo external documentation, OpenAPI spec, or usage guides are available beyond the x402 challenge itself. The endpoint is live and returns a well-formed 402 challenge with a clear input schema. The input schema specifies a required `message` field (string), an optional `wallet_address` field (string), and an optional `stream` field (boolean). Response format is not documented.","tags":[],"capabilities":["crypto-market-analysis","trading-assistant","blockchain-qa","streaming-response","wallet-personalization","x402-micropayment","base-network-usdc"],"categories":["llm","crypto","finance"],"synonyms":["crypto chatbot","trading AI","blockchain assistant","market intelligence","crypto Q&A","DeFi assistant","gigabrain"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all return 404","Response schema is undocumented; the output format is unknown","Financial/trading domain — responses should not be treated as licensed financial advice","Pricing inferred solely from x402 challenge maxAmountRequired field (up to 0.50 USDC per request)"],"endpointUrl":"https://api.gigabrain.gg/brain-chat","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0xC82711a2Eef450704447D5596ff27F4DB971e165","scheme":"exact","network":"base","mimeType":"","resource":"https://api.gigabrain.gg/brain-chat","description":"AI-powered crypto trading assistant with market intelligence","outputSchema":{"input":{"type":"http","method":"POST","required":["message"],"properties":{"stream":{"type":"boolean","description":"Enable streaming response (optional)"},"message":{"type":"string","description":"Your question about crypto trading, market analysis, or blockchain"},"wallet_address":{"type":"string","description":"Your wallet address (optional, for personalized responses)"}},"discoverable":true}},"maxAmountRequired":"500000","maxTimeoutSeconds":60}]},"qualityScore":"0.500","qualityRationale":"The endpoint is live with a well-structured x402 challenge and clear input schema, but there is no documentation, no OpenAPI spec, no example responses, and no crawlable content beyond 'Hello World!' at the root. Response format is entirely unknown and had to be 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'0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':110 '0xc82711a2eef450704447d5596ff27f4db971e165':103 '402':136 '500000':92 '6':94 'DeFi assistant' 'accept':51 'access':73 'address':61,102,155 'ai':1,14,37 'analysi':46 'answer':5,18,40 'assist':4,17 'avail':120 'base':81,109 'base-network-usdc' 'beyond':121 'blockchain':9,22,48 'blockchain assistant' 'blockchain-qa' 'boolean':163 'brain':29 'brain-chat':28 'challeng':124,137 'charg':83 'chat':30 'clear':140 'contract':107 'crypto':2,15,43 'crypto Q&A' 'crypto chatbot' 'crypto-market-analysis' 'decim':95 'document':113,168 'endpoint':38,66,127 'extern':112 'field':150,156,162 'form':135 'format':165 'gigabrain':27 'guid':118 'input':141,144 'languag':55 'live':129 'made':100 'market':6,19,45 'market intelligence' 'maxamountrequir':90 'messag':56,149 'micropay':13,26 'natur':54 'natural-languag':53 'network':82 'openapi':114 'option':58,153,160 'output':69 'pay':34 'pay-per-request':33 'payment':77,98 'per':35,88 'person':63 'protocol':78 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responses)"}},"discoverable":true}},"maxAmountRequired":"500000","maxTimeoutSeconds":60}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":60},"createdAt":"2026-04-18T18:31:00.418Z"}],"sources":[{"listingId":"461bbc9a-2180-47f6-a769-4de222692529","source":"x402_bazaar","sourceId":"https://api.gigabrain.gg/brain-chat","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:00.418Z","lastSeenAt":"2026-04-24T10:31:54.123Z"}],"details":{"listingId":"461bbc9a-2180-47f6-a769-4de222692529","quickStartSnippet":"curl -X POST https://api.gigabrain.gg/brain-chat \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -d '{\"message\": \"What is the current sentiment on ETH?\", \"stream\": false}'","exampleRequest":{"stream":false,"message":"What is the current sentiment on ETH?","wallet_address":"0xYourWalletAddress"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"POST","required":["message"],"properties":{"stream":{"type":"boolean","description":"Enable streaming response (optional)"},"message":{"type":"string","description":"Your question about crypto trading, market analysis, or blockchain"},"wallet_address":{"type":"string","description":"Your wallet address (optional, for personalized responses)"}},"discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint is live and returns a 402 challenge with x402Version 1 on POST","source_url":"https://api.gigabrain.gg/brain-chat"},{"claim":"Payment is in USDC on Base network, maxAmountRequired 500000 (0.50 USDC)","source_url":"https://api.gigabrain.gg/brain-chat"},{"claim":"Input schema requires 'message' field, optionally accepts 'wallet_address' and 'stream'","source_url":"https://api.gigabrain.gg/brain-chat"},{"claim":"Pay-to address is 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