{"id":"c8a487e6-9831-49b0-ae3d-b63410e5f16d","shortId":"vrYYf7","kind":"x402","title":"AI-powered crypto trading signal with conviction score and LLM explanation per coin symbol.","tagline":"AI-powered crypto trading signal with conviction score and LLM explanation per coin symbol.","description":"CryptoBuddy is an x402-payable endpoint that returns AI-generated trading signals for cryptocurrency tokens. You send a coin symbol (e.g. BTC, ETH, SOL) via a POST request with a query parameter, and the service responds with a structured JSON object containing the signal direction, a conviction score, separate buy and sell scores, and a natural-language explanation generated by an LLM.\n\nThe endpoint is hosted on Render and accepts payment on the Base network in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The maximum amount required per call is 500,000 units (0.50 USDC given 6-decimal USDC). The x402 challenge is live and well-formed, returning a version-1 challenge with a full output schema.\n\nDocumentation is minimal — there is no OpenAPI spec, no /docs page, and no README available. All schema information is derived from the x402 challenge's outputSchema. The service self-describes as providing \"AI-powered trading signals, market insight, and predictive analysis,\" but only the /signal endpoint is documented in the challenge. Users should be aware this is a Render-hosted free-tier-style deployment, which may experience cold-start latency.","tags":[],"capabilities":["crypto-trading-signal","llm-explanation","conviction-scoring","buy-sell-score","x402-payment","base-network","usdc-payment","per-symbol-query"],"categories":["crypto","llm","finance"],"synonyms":["crypto signal","trading signal API","AI crypto analysis","coin buy sell signal","cryptocurrency prediction","crypto conviction score","LLM trading explanation"],"warnings":["No documentation available — /docs, /api, /README, /pricing all return 404","Output schema and pricing are inferred entirely from the x402 challenge; no independent docs confirm behavior","Hosted on Render free-tier-style URL; may experience cold-start delays","Example response is synthetic — no actual paid response was captured","This provides financial trading signals — not investment advice; use at your own risk"],"endpointUrl":"https://cryptobuddy-96zq.onrender.com/signal","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x58Be3eB5c86dAcfC6ac71FaD3aAd8A7D07EEB391","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://cryptobuddy-96zq.onrender.com/signal","description":"Signal + conviction + LLM explanation","outputSchema":{"input":{"type":"http","method":"POST","queryParams":{"symbol":{"type":"string","required":true,"description":"Enter Coin Symbol for the AI Signal e.g. BTC ETH SOL etc."}},"discoverable":true},"output":{"type":"object","properties":{"signal":{"type":"string"},"symbol":{"type":"string"},"buyScore":{"type":"number"},"sellScore":{"type":"number"},"timestamp":{"type":"string"},"conviction":{"type":"number"},"explanation":{"type":"string"}}}},"maxAmountRequired":"500000","maxTimeoutSeconds":60}]},"qualityScore":"0.550","qualityRationale":"The x402 challenge is live and includes a well-structured outputSchema with input/output definitions, which is the primary source of all technical detail. However, there is no OpenAPI spec, no documentation pages, no usage examples from the provider, and no additional endpoints are discoverable. Pricing is inferrable from the challenge but not explicitly documented. The response schema fields are inferred from the challenge, and the example response is fabricated to match the 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