{"id":"53529508-8798-41c2-8536-ceb99a4bfad0","shortId":"hfPDgp","kind":"x402","title":"YFI OHLCV candlestick data via x402 micropayment on Base, $0.02 per request.","tagline":"YFI OHLCV candlestick data via x402 micropayment on Base, $0.02 per request.","description":"This endpoint provides OHLCV (Open, High, Low, Close, Volume) candlestick data for the Yearn Finance (YFI) token. It is part of the lowpaymentfee.com platform, which offers a variety of data, AI, finance, and utility APIs all gated behind the x402 payment protocol. Each request costs $0.02 in USDC on the Base network — no API keys, no rate limits, and no subscriptions required.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers include an X-PAYMENT header with a signed payment authorization for 0.02 USDC (20,000 base units at 6 decimals) to the provider's address on Base. The payment settles using the \"exact\" scheme with USDC (contract 0x8335…2913) and supports a 300-second timeout window.\n\nThe broader lowpaymentfee.com platform lists additional crypto endpoints (token quotes, gas estimates, price feeds, exchange rates) as well as AI/ML endpoints (sentiment analysis, summarization, classification, embeddings) and utility services (geocoding, validation, conversion). All share the same $0.02 per-request pricing model. Documentation beyond the landing page is sparse — the /docs, /pricing, and /api pages only show a wallet-connect prompt with no further technical detail.","tags":[],"capabilities":["ohlcv-data","crypto-market-data","yfi-token","x402-payment","usdc-base-network","per-request-pricing","no-api-key","json-response"],"categories":["finance","crypto"],"synonyms":["YFI candlestick data","Yearn Finance OHLCV","crypto OHLCV API","YFI price history","YFI market data","candlestick chart data","x402 crypto data"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all render only a wallet-connect prompt with no technical content.","Request parameters (time range, candle interval, etc.) are undocumented; callers must guess or experiment.","Response schema is unknown — no examples or OpenAPI spec provided.","The broader platform lists many endpoints but none have visible documentation, raising questions about maturity."],"endpointUrl":"https://lowpaymentfee.com/api/v1/crypto/YFI/ohlcv","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/crypto/YFI/ohlcv","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and accepts payment. However, there is no OpenAPI schema, no response examples, no documentation of request parameters (e.g., time range, interval), and the docs/pricing/API pages are empty beyond a wallet-connect prompt. The actual response format is entirely 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COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/crypto/YFI/ohlcv","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:44.912Z"}],"sources":[{"listingId":"53529508-8798-41c2-8536-ceb99a4bfad0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/crypto/YFI/ohlcv","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:44.912Z","lastSeenAt":"2026-04-23T20:01:32.978Z"}],"details":{"listingId":"53529508-8798-41c2-8536-ceb99a4bfad0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/crypto/YFI/ohlcv \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\"","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/crypto/YFI/ohlcv","method":"POST","headers":{"X-PAYMENT":"<x402-signed-payment-header>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/crypto/YFI/ohlcv"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/crypto/YFI/ohlcv"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists crypto endpoints including token quotes, gas estimates, price feeds, and exchange rates","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching YFI historical price candles for charting or technical analysis","Programmatic trading bots that need YFI OHLCV data on demand","AI agents that need real-time crypto market data without managing API keys","Portfolio dashboards displaying YFI price movements"],"bestFor":["Agents or bots that can pay per-request with USDC on Base","Developers who want keyless, pay-as-you-go crypto market data","Low-volume or sporadic YFI data lookups where subscriptions are overkill"],"notFor":["High-frequency trading requiring sub-second latency and bulk historical data (no documented bulk endpoints)","Users without a Base-network USDC wallet or x402-compatible client","Anyone needing detailed API documentation or guaranteed SLAs (docs are minimal)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:19:08.238Z"},"updatedAt":"2026-04-23T20:01:32.978Z"}}