{"id":"7d287943-f4c9-4f2f-9d7c-a44cfb496288","shortId":"x2c5am","kind":"x402","title":"Historical crude oil (CL) stock/commodity data via x402 micropayment on Base for $0.02/request.","tagline":"Historical crude oil (CL) stock/commodity data via x402 micropayment on Base for $0.02/request.","description":"This endpoint at lowpaymentfee.com provides historical price data for the CL (crude oil futures) ticker via a pay-per-request x402 model. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals). No API keys, rate limits, or subscriptions are required — each call is individually paid via the x402 protocol's X-PAYMENT header.\n\nThe provider, lowpaymentfee.com, hosts a broader suite of APIs spanning data analytics, AI/ML inference, finance/crypto market data, and utility services, all priced uniformly at $0.02 per request. Documentation beyond the landing page is extremely thin — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. As a result, the exact request body schema, available query parameters (e.g., date ranges, intervals), and response format for the /stocks/CL/history endpoint are unknown and must be discovered experimentally.\n\nThe endpoint is confirmed live: the probe received a proper HTTP 402 x402 challenge with version 1, scheme \"exact\", and a 300-second payment timeout. The asset is USD Coin (version 2) on Base mainnet.","tags":[],"capabilities":["historical-price-data","commodity-data","crude-oil-futures","x402-micropayment","usdc-base-settlement","pay-per-request","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["crude oil history","CL futures data","commodity price API","oil price history","WTI crude data","historical stock data","x402 finance API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all return only a wallet-connect prompt with no technical content.","Request body schema and response format are unknown; the example_request_json is speculative.","Data source, coverage period, and update frequency for CL historical data are undocumented.","No OpenAPI spec or AI plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stocks/CL/history","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/stocks/CL/history","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation for request parameters, response schema, or data coverage. The /docs, /pricing, and /README pages are empty stubs. The example request JSON is entirely 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'/docs':145 '/pricing':146 '/readme':149 '/request':14,28 '/stocks/cl/history':183 '0.02':13,27,76,133 '000':80 '0x8335':70 '1':208 '2':223 '20':79 '2913':71 '300':213 '402':203 '6':84 'CL futures data' 'WTI crude data' 'accept':54 'ai/ml':121 'analyt':120 'api':87,117 'asset':218 'avail':171 'base':11,25,65,81,225 'beyond':137 'bodi':169 'broader':114 'call':96 'challeng':205 'cl':4,18,39 'coin':221 'commodity price API' 'commodity-data' 'confirm':195 'connect':155 'contract':69 'cost':74 'crude':2,16,40 'crude oil history' 'crude-oil-futures' 'data':6,20,36,119,125 'date':175 'decim':85 'detail':162 'discov':190 'document':136 'e.g':174 'endpoint':30,53,184,193 'exact':167,210 'experiment':191 'extrem':142 'finance/crypto':123 'format':180 'futur':42 'header':108 'histor':1,15,34 'historical stock data' 'historical-price-data' 'host':112 'http':202 'individu':98 'infer':122 'interv':177 'json':59 'json-response' 'key':88 'land':139 'limit':90 'live':196 'lowpaymentfee.com':32,111 'mainnet':226 'market':124 'micropay':9,23 'model':51 'must':188 'network':66 'no-api-key' 'oil':3,17,41 'oil price history' 'page':140,150 'paid':99 'paramet':173 'pay':47 'pay-per-request':46 'payment':60,107,215 'per':48,77,134 'post':55 'price':35,130 'probe':198 'prompt':157 'proper':201 'protocol':103 'provid':33,110 'queri':172 'rang':176 'rate':89 'receiv':199 'render':152 'request':49,56,78,135,168 'requir':94 'respons':179 'result':165 'return':58 'schema':170 'scheme':209 'second':214 'servic':128 'settl':62 'span':118 'stock/commodity':5,19 'subscript':92 'suit':115 'technic':161 'thin':143 'ticker':43 'timeout':216 'uniform':131 'unit':82 'unknown':186 'usd':220 'usdc':68 'usdc-base-settlement' 'use':67 'util':127 'version':207,222 'via':7,21,44,100 'wallet':156 'x':106 'x-payment':105 'x402':8,22,50,102,204 'x402 finance API' 'x402-micropayment'","prices":[{"id":"21c3f911-ca14-4c79-8bf2-2bf7f74a60e7","listingId":"7d287943-f4c9-4f2f-9d7c-a44cfb496288","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/stocks/CL/history","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:43.642Z"}],"sources":[{"listingId":"7d287943-f4c9-4f2f-9d7c-a44cfb496288","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stocks/CL/history","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:43.642Z","lastSeenAt":"2026-04-23T20:01:23.371Z"}],"details":{"listingId":"7d287943-f4c9-4f2f-9d7c-a44cfb496288","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stocks/CL/history \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -d '{}'","exampleRequest":{"range":"1m","symbol":"CL"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 version 1 challenge, scheme exact, on Base network using USDC asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stocks/CL/history"},{"claim":"maxAmountRequired is 20000 base units (USDC, 6 decimals = $0.02)","source_url":"https://lowpaymentfee.com/api/v1/stocks/CL/history"},{"claim":"Provider advertises $0.02/request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Provider lists finance, AI/ML, data analytics, and utility API categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) contain only a Connect wallet prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching historical crude oil (CL) futures price data for backtesting trading strategies","Integrating commodity price history into financial dashboards or analytics pipelines","Agent-driven on-demand retrieval of oil market data without subscription overhead","Building datasets for energy market research or forecasting models"],"bestFor":["Developers needing low-friction, pay-per-call access to commodity history","AI agents that need to autonomously purchase financial data on-chain","Projects that want to avoid API key management and subscription commitments"],"notFor":["High-frequency trading requiring sub-second latency and bulk data (no documented batch endpoint)","Users who need comprehensive documentation or guaranteed SLAs before integrating","Free-tier seekers — every request costs $0.02 in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T19:31:39.668Z"},"updatedAt":"2026-04-23T20:01:23.371Z"}}