{"id":"43317cca-7236-4683-96c8-5c33e1adf338","shortId":"FvqUtE","kind":"x402","title":"OHLCV candlestick data for Polkadot (DOT) via per-request x402 micropayment on Base.","tagline":"OHLCV candlestick data for Polkadot (DOT) via per-request x402 micropayment on Base.","description":"This endpoint provides OHLCV (Open, High, Low, Close, Volume) market data for the Polkadot (DOT) cryptocurrency. It is part of the lowpaymentfee.com platform, which offers a suite of data, AI, finance, and utility APIs all gated behind x402 micropayments on the Base network.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled via the x402 protocol: each request costs $0.02 in USDC (the challenge advertises a maxAmountRequired of 20,000 base units of USDC on Base, which equals $0.02 given USDC's 6 decimals). There are no API keys, no rate limits, and no subscription commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof for each request.\n\nThe broader lowpaymentfee.com platform lists endpoints across categories including analytics, AI/ML (sentiment, summarization, classification, embeddings), finance (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities. All share the same $0.02-per-request pricing model. Documentation beyond the landing page is sparse; the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail.","tags":[],"capabilities":["ohlcv-data","crypto-market-data","polkadot-dot","x402-payment","usdc-base-network","per-request-micropayment","json-response"],"categories":["finance","crypto"],"synonyms":["DOT candlestick data","Polkadot OHLCV","DOT price history","crypto OHLCV API","Polkadot market data","DOT candles","cryptocurrency historical data"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no technical content.","Request body schema is unknown: it is unclear what parameters (timeframe, start/end dates, etc.) the OHLCV endpoint accepts.","Response schema is unknown: no example response or output schema is provided.","The platform lists many diverse endpoints (AI, analytics, finance, utils) all at $0.02 — the actual data quality and sources behind them are unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/crypto/DOT/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/DOT/ohlcv","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC per request on Base). However, there is no OpenAPI schema, no documented request parameters (e.g., timeframe, date range), no example responses, and all documentation pages beyond the landing page are empty. The actual data format and accepted inputs must be 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'000':100 '20':99 '6':113 'DOT candles' 'DOT candlestick data' 'DOT price history' 'Polkadot OHLCV' 'Polkadot market data' 'accept':74 'across':150 'addit':204 'advertis':95 'ai':58 'ai/ml':154 'analyt':153 'api':62,118,190 'attach':129 'base':14,28,70,101,106 'behind':65 'beyond':182 'broader':145 'caller':127 'candlestick':2,16 'categori':151 'challeng':94 'classif':157 'close':36 'commit':126 'connect':199 'cost':89 'crypto OHLCV API' 'crypto-market-data' 'cryptocurr':44 'cryptocurrency historical data' 'data':3,17,39,57 'decim':114 'detail':206 'doc':189 'document':181 'dot':6,20,43 'embed':158 'endpoint':30,73,149 'equal':108 'estim':167 'exchang':162 'feed':161 'financ':59,159 'gas':166 'gate':64 'given':110 'handl':82 'header':134 'high':34 'includ':152 'infrastructur':169 'json':79 'json-response' 'key':119 'land':184 'limit':122 'list':148 'low':35 'lowpaymentfee.com':50,146 'market':38 'maxamountrequir':97 'micropay':12,26,67 'model':180 'network':71 'offer':53 'ohlcv':1,15,32 'ohlcv-data' 'open':33 'page':185,194 'part':47 'payment':80,133,139 'per':9,23,177 'per-request':8,22,176 'per-request-micropayment' 'platform':51,147 'polkadot':5,19,42 'polkadot-dot' 'post':75 'price':160,179,191 'prompt':201 'proof':140 'protocol':86 'provid':31 'quot':165 'rate':121,163 'readm':193 'render':196 'request':10,24,76,88,143,178 'return':78 'sentiment':155 'share':172 'simpli':128 'spars':187 'subscript':125 'suit':55 'summar':156 'technic':205 'token':164 'unit':102 'usdc':92,104,111 'usdc-base-network' 'util':61,170 'valid':137 'via':7,21,83 'volum':37 'wallet':200 'x':132 'x-payment':131 'x402':11,25,66,85,138 'x402-payment'","prices":[{"id":"5890b580-481f-448a-bfef-1411c85a3fc3","listingId":"43317cca-7236-4683-96c8-5c33e1adf338","amountUsd":null,"unit":"per_call","nativeCurrency":"USD 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/DOT/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":"2026-04-18T18:37:00.797Z"}],"sources":[{"listingId":"43317cca-7236-4683-96c8-5c33e1adf338","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/crypto/DOT/ohlcv","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:00.797Z","lastSeenAt":"2026-04-24T09:03:05.587Z"}],"details":{"listingId":"43317cca-7236-4683-96c8-5c33e1adf338","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/crypto/DOT/ohlcv \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -d '{}'","exampleRequest":{},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/crypto/DOT/ohlcv"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/crypto/DOT/ohlcv"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching historical OHLCV candlestick data for Polkadot (DOT) for charting or backtesting","Integrating DOT price data into trading bots or portfolio dashboards","Programmatic access to DOT market data without API key management"],"bestFor":["Agents or bots that need on-demand DOT market data without subscription overhead","Developers prototyping crypto dashboards who want instant pay-per-use access","Automated trading strategies requiring OHLCV candle data for Polkadot"],"notFor":["High-frequency trading requiring sub-second latency and free bulk access","Users who need comprehensive multi-asset OHLCV data in a single call","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.077Z"},"updatedAt":"2026-04-24T09:03:05.587Z"}}