{"id":"306e18b3-947c-4674-a602-9280a9c5bde6","shortId":"dMBy6W","kind":"x402","title":"USD/NOK forex exchange rate via x402 micropayment on Base, $0.02 per request.","tagline":"USD/NOK forex exchange rate via x402 micropayment on Base, $0.02 per request.","description":"This endpoint returns the current USD/NOK foreign exchange rate, payable per-request via the x402 protocol on the Base network. It is part of a broader suite of APIs offered by lowpaymentfee.com, which spans data analytics, AI/ML inference, finance, crypto, and utility endpoints — all priced at $0.02 per call using USDC on Base.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 \"exact\" scheme, settling in USDC (contract 0x8335…2913) on Base. The max amount required is 20,000 base units, which at 6 decimals for USDC equals $0.02. No API keys or rate limits are advertised; access is gated solely by micropayment. The timeout for payment settlement is 300 seconds.\n\nDocumentation beyond the landing page is sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no example request/response, and no description of the response schema. The endpoint is confirmed live (returns 402 with a valid x402 challenge).","tags":[],"capabilities":["forex-rate","usd-nok","x402-payment","usdc-base","per-request-pricing","real-time-data","micropayment-api"],"categories":["finance","forex"],"synonyms":["USD NOK exchange rate","dollar krone rate","forex API","currency conversion","FX rate","USDNOK","Norwegian krone rate"],"warnings":["No OpenAPI or schema documentation available — response format is unknown","All doc/pricing/API pages render only 'Connect wallet' with no technical content","No example request or response bodies are available to verify output format","The specific forex endpoint /api/v1/forex/USDNOK/rate is not listed on the landing page among the advertised APIs, though similar finance endpoints are"],"endpointUrl":"https://lowpaymentfee.com/api/v1/forex/USDNOK/rate","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/rate","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no example payloads, and all documentation pages beyond the landing page are empty wallet-connect stubs. The listing is functional but minimally 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'/docs':157 '/pricing':158 '/readme':161 '0.02':10,22,72,126 '000':116 '0x8335':106 '20':115 '2913':107 '300':147 '402':196 '6':121 'FX rate' 'Norwegian krone rate' 'USD NOK exchange rate' 'USDNOK' 'accept':81 'access':135 'advertis':134 'ai/ml':62 'amount':112 'analyt':61 'api':54,128 'base':9,21,44,78,109,117 'beyond':150 'broader':51 'call':74 'challeng':201 'confirm':193 'connect':167 'contract':105 'crypto':65 'currency conversion' 'current':29 'data':60 'decim':122 'descript':185 'detail':174 'document':149 'dollar krone rate' 'endpoint':26,68,80,191 'equal':125 'exact':100 'exampl':181 'exchang':3,15,32 'financ':64 'foreign':31 'forex':2,14 'forex API' 'forex-rate' 'gate':137 'handl':89 'header':96 'infer':63 'inlin':90 'json':86 'key':129 'land':152 'limit':132 'live':194 'lowpaymentfee.com':57 'max':111 'micropay':7,19,140 'micropayment-api' 'network':45 'offer':55 'openapi':178 'page':153,162 'part':48 'payabl':34 'payment':87,95,144 'per':11,23,36,73 'per-request':35 'per-request-pricing' 'post':82 'price':70 'prompt':169 'protocol':41 'rate':4,16,33,131 'real-time-data' 'render':164 'request':12,24,37,83 'request/response':182 'requir':113 'respons':188 'return':27,85,195 'schema':189 'scheme':101 'second':148 'settl':102 'settlement':145 'sole':138 'span':59 'spars':155 'spec':179 'suit':52 'technic':173 'timeout':142 'unit':118 'usd-nok' 'usd/nok':1,13,30 'usdc':76,104,124 'usdc-base' 'use':75,97 'util':67 'valid':199 'via':5,17,38,91 'wallet':168 'x':94 'x-payment':93 'x402':6,18,40,99,200 'x402-payment'","prices":[{"id":"40333c3d-bcf3-4515-b41e-842c98f79523","listingId":"306e18b3-947c-4674-a602-9280a9c5bde6","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/rate","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:46:52.085Z"}],"sources":[{"listingId":"306e18b3-947c-4674-a602-9280a9c5bde6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/forex/USDNOK/rate","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:52.085Z","lastSeenAt":"2026-04-29T12:35:31.300Z"}],"details":{"listingId":"306e18b3-947c-4674-a602-9280a9c5bde6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/forex/USDNOK/rate \\\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 HTTP 402 with a valid x402 challenge confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/forex/USDNOK/rate"},{"claim":"Price is $0.02 per request (maxAmountRequired 20000 base units, USDC with 6 decimals)","source_url":"https://lowpaymentfee.com/api/v1/forex/USDNOK/rate"},{"claim":"Payment settles in USDC on Base network to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/forex/USDNOK/rate"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys or rate limits","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching the current USD/NOK exchange rate for financial applications","Integrating real-time forex data into trading bots or dashboards","Programmatic currency conversion for invoicing or pricing in NOK","Agent-driven forex lookups without API key management"],"bestFor":["Developers needing on-demand USD/NOK rates without subscription commitments","AI agents that can pay per-call via x402 on Base","Applications requiring low-cost, keyless forex data access"],"notFor":["High-frequency trading requiring sub-second latency guarantees (no SLA documented)","Users who need historical forex time-series data (only current rate advertised)","Consumers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:17.368Z"},"updatedAt":"2026-04-29T12:35:31.300Z"}}