{"id":"bd9ff5c4-c1aa-4306-8cf3-f6e8c85cb665","shortId":"N9bPj6","kind":"x402","title":"Historical USD/NOK forex data via x402 micropayment on Base, $0.02 per request.","tagline":"Historical USD/NOK forex data via x402 micropayment on Base, $0.02 per request.","description":"This endpoint provides historical exchange rate data for the USD/NOK currency pair. It is part of the lowpaymentfee.com platform, which offers a variety of pay-per-request APIs spanning finance, analytics, AI, and utility services. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network at $0.02 per call.\n\nThe specific endpoint at `/api/v1/forex/USDNOK/history` accepts POST requests and returns JSON. The x402 challenge confirms the endpoint is live, requiring a maximum payment of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimal places. No API keys or rate limits are advertised — access is gated purely by the x402 payment header.\n\nDocumentation is extremely sparse. The platform's docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what fields the history endpoint accepts or returns. The endpoint name and URL path suggest it returns historical forex data for USD/NOK, but the exact request parameters (date range, granularity, etc.) and response shape are unknown.","tags":[],"capabilities":["forex-history","usd-nok","x402-payment","usdc-base","pay-per-request","json-api"],"categories":["finance","forex"],"synonyms":["USD NOK exchange rate","dollar krone history","forex historical data","currency pair history","USDNOK rate","FX history API"],"warnings":["No API documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no technical content","No OpenAPI or JSON schema describing request parameters or response format","Request body structure and supported query parameters (date range, granularity, etc.) are unknown","Response shape is completely undocumented — no example responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/forex/USDNOK/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/forex/USDNOK/history","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and the docs pages are empty stubs. The actual request parameters and response format are entirely unknown, making integration 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'0.02':10,22,79,118 '000':107 '0x8335':112 '20':106 '2913':113 '6':122 'FX history API' 'USD NOK exchange rate' 'USDNOK rate' 'accept':87,183 'access':133 'advertis':132 'ai':57 'analyt':56 'api':53,126,152 'base':9,21,76,108,115 'call':81 'challeng':95 'confirm':96 'connect':158 'currenc':35 'currency pair history' 'data':4,16,31,197 'date':205 'decim':123 'descript':176 'detail':165 'doc':149 'document':142 'dollar krone history' 'endpoint':26,62,84,98,182,187 'equal':117 'etc':208 'exact':202 'exampl':173 'exchang':29 'extrem':144 'field':179 'financ':55 'forex':3,15,196 'forex historical data' 'forex-history' 'gate':135 'given':119 'granular':207 'header':141 'histor':1,13,28,195 'histori':181 'json':92 'json-api' 'key':127 'limit':130 'live':100 'lowpaymentfee.com':42 'maximum':103 'micropay':7,19 'name':188 'network':77 'offer':45 'openapi':169 'page':153 'pair':36 'paramet':204 'part':39 'path':191 'pay':50 'pay-per-request':49 'payment':69,104,140 'per':11,23,51,80 'place':124 'platform':43,65,147 'post':88 'price':150 'prompt':160 'protocol':70 'provid':27 'pure':136 'rang':206 'rate':30,129 'render':155 'request':12,24,52,89,203 'request/response':172 'requir':101 'respons':210 'return':91,185,194 'schema':170 'servic':60 'settl':71 'shape':211 'span':54 'spars':145 'specif':83 'suggest':192 'technic':164 'unit':109 'unknown':213 'url':190 'usd-nok' 'usd/nok':2,14,34,199 'usdc':73,111,120 'usdc-base' 'use':66 'util':59 'varieti':47 'via':5,17 'wallet':159 'x402':6,18,68,94,139 'x402-payment'","prices":[{"id":"ba44ce5c-7dc3-430d-89e9-de9fb28a24e2","listingId":"bd9ff5c4-c1aa-4306-8cf3-f6e8c85cb665","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/forex/USDNOK/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":"2026-04-18T18:46:49.134Z"}],"sources":[{"listingId":"bd9ff5c4-c1aa-4306-8cf3-f6e8c85cb665","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/forex/USDNOK/history","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:49.134Z","lastSeenAt":"2026-04-29T13:05:03.208Z"}],"details":{"listingId":"bd9ff5c4-c1aa-4306-8cf3-f6e8c85cb665","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/forex/USDNOK/history \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\"","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/forex/USDNOK/history"},{"claim":"Platform pricing is $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 on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/forex/USDNOK/history"}],"useCases":["Retrieving historical USD/NOK exchange rates for financial analysis","Backtesting currency trading strategies involving the Norwegian krone","Feeding forex data into dashboards or reporting tools without API key management","Agent-driven micropayment access to forex data on Base network"],"bestFor":["Developers needing quick, keyless access to USD/NOK historical rates","AI agents that can settle x402 payments in USDC on Base","Low-volume or sporadic forex data consumers who prefer pay-per-call pricing"],"notFor":["High-frequency trading requiring sub-second latency and guaranteed SLAs","Users who need comprehensive multi-pair forex coverage from a single documented API","Anyone requiring detailed API documentation or schema guarantees before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:17.533Z"},"updatedAt":"2026-04-29T13:05:03.208Z"}}