{"id":"dc9208e7-7008-4fb6-b712-a7e03625ca3c","shortId":"tXpsSG","kind":"x402","title":"OHLCV candlestick data for QNT (Quant) via per-request x402 micropayment on Base.","tagline":"OHLCV candlestick data for QNT (Quant) via per-request x402 micropayment on Base.","description":"This endpoint provides OHLCV (Open, High, Low, Close, Volume) candlestick data for the QNT (Quant) cryptocurrency token. It is part of a broader suite of finance, analytics, AI, and utility APIs offered by lowpaymentfee.com, all gated behind the x402 payment protocol on the Base network.\n\nEach request costs $0.02 in USDC (the x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC on Base, which equals $0.02 given USDC's 6 decimals). Payment is settled on-chain via the x402 \"exact\" scheme — no API keys, accounts, or rate limits are required. The endpoint accepts POST requests and returns JSON.\n\nDocumentation beyond the landing page is extremely sparse; the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. The specific request parameters (e.g., time range, interval, pagination) and response format for the OHLCV data are unknown and must be discovered experimentally.","tags":[],"capabilities":["ohlcv-candlestick-data","crypto-market-data","x402-micropayment","base-network-settlement","usdc-payment","per-request-pricing","no-api-key"],"categories":["finance","crypto"],"synonyms":["QNT price data","Quant OHLCV","crypto candlestick API","QNT market data","cryptocurrency OHLCV","token price history","QNT chart data"],"warnings":["No OpenAPI or schema documentation available — request parameters and response format are unknown","All doc pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt with no content","The specific OHLCV endpoint for QNT is not listed on the landing page; only generic crypto endpoints are shown","Cannot verify what data source backs the OHLCV data or its freshness/reliability"],"endpointUrl":"https://lowpaymentfee.com/api/v1/crypto/QNT/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/QNT/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 and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI spec, no documented request/response schema, no usage examples, and all documentation pages return only a wallet-connect stub. The actual request parameters and response format for OHLCV data are entirely 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'/docs':140 '/pricing':142 '/readme':144 '0.02':77,97 '000':88 '20':87 '6':101 'QNT chart data' 'QNT market data' 'QNT price data' 'Quant OHLCV' 'accept':125 'account':117 'addit':155 'advertis':83 'ai':56 'analyt':55 'api':59,115 'avail':170 'base':14,28,72,89,94 'base-network-settlement' 'behind':65 'beyond':132 'broader':51 'candlestick':2,16,38 'chain':108 'challeng':82 'close':36 'connect':150 'cost':76 'crawl':173 'crypto candlestick API' 'crypto-market-data' 'cryptocurr':44 'cryptocurrency OHLCV' 'data':3,17,39,190 'decim':102 'detail':157 'discov':196 'document':131 'e.g':179 'endpoint':30,124 'equal':96 'exact':112 'exampl':169 'experiment':197 'extrem':137 'financ':54 'format':186 'gate':64 'given':98 'high':34 'interv':182 'json':130 'key':116 'land':134 'limit':120 'low':35 'lowpaymentfee.com':62 'materi':174 'maxamountrequir':85 'micropay':12,26 'must':194 'network':73 'no-api-key' 'offer':60 'ohlcv':1,15,32,189 'ohlcv-candlestick-data' 'on-chain':106 'open':33 'openapi':161 'page':135,145 'pagin':183 'paramet':178 'part':48 'payment':68,103 'per':9,23 'per-request':8,22 'per-request-pricing' 'post':126 'prompt':152 'protocol':69 'provid':31 'qnt':5,19,42 'quant':6,20,43 'rang':181 'rate':119 'render':147 'request':10,24,75,127,177 'request/response':164 'requir':122 'respons':185 'return':129 'schema':165 'scheme':113 'settl':105 'spars':138 'spec':162 'specif':176 'suit':52 'technic':156 'time':180 'token':45 'token price history' 'unit':90 'unknown':192 'usag':168 'usdc':79,92,99 'usdc-payment' 'util':58 'via':7,21,109 'volum':37 'wallet':151 'x402':11,25,67,81,111 'x402-micropayment'","prices":[{"id":"226f2fcd-7e09-4a64-bf68-b08a31ddc1a1","listingId":"dc9208e7-7008-4fb6-b712-a7e03625ca3c","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/QNT/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":"2026-04-18T18:38:57.962Z"}],"sources":[{"listingId":"dc9208e7-7008-4fb6-b712-a7e03625ca3c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/crypto/QNT/ohlcv","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:57.962Z","lastSeenAt":"2026-04-24T05:31:49.488Z"}],"details":{"listingId":"dc9208e7-7008-4fb6-b712-a7e03625ca3c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/crypto/QNT/ohlcv \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -d '{}'","exampleRequest":null,"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/QNT/ohlcv"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/crypto/QNT/ohlcv"},{"claim":"All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching historical OHLCV candlestick data for QNT to build trading charts","Programmatic access to QNT price history for backtesting trading strategies","Integrating QNT market data into dashboards or portfolio trackers"],"bestFor":["Agents or bots that need on-demand QNT price data without managing API keys","Developers building crypto analytics tools who prefer pay-per-call pricing","Automated trading systems that need OHLCV data settled via on-chain micropayments"],"notFor":["High-frequency trading requiring sub-second latency (on-chain payment adds overhead)","Users who need free or bulk-discounted market data across many tokens"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:40.268Z"},"updatedAt":"2026-04-24T05:31:49.488Z"}}