{"id":"f6cc0306-d2e6-4bf0-bfa5-473cc98d416c","shortId":"ygsJVg","kind":"x402","title":"Historical stock data for UNP (Union Pacific) via x402 micropayment on Base, $0.02/request.","tagline":"Historical stock data for UNP (Union Pacific) via x402 micropayment on Base, $0.02/request.","description":"This endpoint provides historical stock price data for Union Pacific Corporation (ticker: UNP) through the x402 payment protocol. It is part of a broader suite of paid APIs hosted at lowpaymentfee.com, which spans data analytics, AI/ML inference, finance, crypto, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers include an X-PAYMENT header with a signed USDC payment of up to $0.02 (20,000 base units of USDC, 6 decimals). No API keys or accounts are required; access is granted per-request upon valid payment. The provider advertises no rate limits and instant access.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, 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 example payloads available. The endpoint is live (returns a proper 402 challenge), but the exact request body format and response structure for historical stock data must be inferred or discovered experimentally.","tags":[],"capabilities":["stock-history","financial-data","x402-payment","usdc-settlement","base-network","per-request-pricing","no-api-key"],"categories":["finance","data"],"synonyms":["stock price history","UNP historical data","Union Pacific stock API","equity price data","stock market API","x402 stock data","micropayment stock API"],"warnings":["No OpenAPI or schema available — request body format and response structure are unknown","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific stock endpoint (UNP/history) is not listed on the landing page; it may be part of an undocumented broader stocks API","No SLA, rate limit, or data source information provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stocks/UNP/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/UNP/history","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 request/response schema, no documentation, and no examples. The docs pages are all empty wallet-connect stubs. The listing is effectively a stub with confirmed liveness and 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'/docs':159 '/pricing':160 '/readme':163 '/request':14,28 '0.02':13,27,74,116 '000':118 '20':117 '402':197 '6':123 'UNP historical data' 'Union Pacific stock API' 'accept':87 'access':132,149 'account':129 'addit':174 'advertis':143 'ai/ml':64 'analyt':63 'api':56,126 'avail':189 'base':12,26,83,119 'base-network' 'beyond':151 'bodi':203 'broader':52 'caller':101 'challeng':198 'connect':169 'corpor':39 'crypto':67 'data':3,17,35,62,211 'decim':124 'detail':176 'discov':216 'document':150 'endpoint':30,86,191 'equity price data' 'exact':201 'exampl':187 'experiment':217 'extrem':156 'financ':66 'financial-data' 'format':204 'grant':134 'handl':95 'header':107 'histor':1,15,32,209 'host':57 'includ':102 'infer':65,214 'inlin':96 'instant':148 'json':92 'key':127 'land':153 'limit':146 'live':193 'lowpaymentfee.com':59 'micropay':10,24 'micropayment stock API' 'must':212 'network':84 'no-api-key' 'openapi':180 'pacif':7,21,38 'page':154,164 'paid':55 'part':49 'payload':188 'payment':45,93,106,112,140 'per':75,136 'per-request':135 'per-request-pricing' 'post':88 'price':34,72 'prompt':171 'proper':196 'protocol':46,100 'provid':31,142 'rate':145 'render':166 'request':76,89,137,202 'request/response':183 'requir':131 'respons':206 'return':91,194 'schema':184 'servic':70 'settl':78 'sign':110 'span':61 'spars':157 'spec':181 'stock':2,16,33,210 'stock market API' 'stock price history' 'stock-history' 'structur':207 'suit':53 'technic':175 'ticker':40 'union':6,20,37 'unit':120 'unp':5,19,41 'upon':138 'usdc':80,111,122 'usdc-settlement' 'util':69 'valid':139 'via':8,22,97 'wallet':170 'x':105 'x-payment':104 'x402':9,23,44,99 'x402 stock data' 'x402-payment'","prices":[{"id":"832be8f5-267b-4c06-85fa-6eed7507d69d","listingId":"f6cc0306-d2e6-4bf0-bfa5-473cc98d416c","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/UNP/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":"2026-04-18T18:32:50.989Z"}],"sources":[{"listingId":"f6cc0306-d2e6-4bf0-bfa5-473cc98d416c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stocks/UNP/history","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:50.989Z","lastSeenAt":"2026-04-23T20:01:23.872Z"}],"details":{"listingId":"f6cc0306-d2e6-4bf0-bfa5-473cc98d416c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stocks/UNP/history \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stocks/UNP/history"},{"claim":"All APIs on lowpaymentfee.com 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"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/stocks/UNP/history"}],"useCases":["Retrieving historical price data for Union Pacific (UNP) stock for backtesting or analysis","Integrating pay-per-call stock data into autonomous trading agents without API key management","Building financial dashboards that pull historical equity data on demand"],"bestFor":["Agents or apps needing on-demand stock history without subscription commitments","Developers who want to pay per request in USDC on Base without account signup","Lightweight financial data retrieval where $0.02/call is cost-effective"],"notFor":["High-frequency trading requiring sub-second latency and bulk data downloads","Users who need comprehensive documentation or guaranteed SLAs before integrating","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T19:34:10.262Z"},"updatedAt":"2026-04-23T20:01:23.872Z"}}