{"id":"12b2f2d6-1bd9-4ac7-a416-50e76707ae4d","shortId":"79VBNn","kind":"x402","title":"USD/SEK forex rate via x402 micropayment on Base for $0.02 per request.","tagline":"USD/SEK forex rate via x402 micropayment on Base for $0.02 per request.","description":"This endpoint provides the USD/SEK foreign exchange rate through an x402-enabled API hosted at lowpaymentfee.com. Each request costs $0.02 (20,000 base units of USDC on the Base network, where USDC uses 6 decimals). Payment is handled inline via the x402 protocol — no API keys, accounts, or rate limits are required. The caller simply includes an X-PAYMENT header with a valid payment proof.\n\nThe endpoint is part of a broader suite of APIs offered by lowpaymentfee.com spanning data analytics, AI/ML inference, finance/crypto data, and utility services, all priced uniformly at $0.02 per request. The forex endpoint specifically targets the USD to Swedish Krona (SEK) currency pair. The response MIME type is application/json.\n\nDocumentation on the site is extremely 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 request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the actual response format after payment is unknown.","tags":[],"capabilities":["forex-rate","usd-sek","x402-payment","micropayment","base-network","usdc-settlement","no-api-key","pay-per-request"],"categories":["finance","forex"],"synonyms":["USD SEK exchange rate","dollar to krona","foreign exchange API","FX rate API","currency conversion","USDSEK rate","forex data"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.","No request or response schema documented; actual response format after payment is unknown.","No OpenAPI or machine-readable spec found.","The specific forex endpoint /api/v1/forex/USDSEK is not listed on the landing page's available APIs, though similar finance endpoints are."],"endpointUrl":"https://lowpaymentfee.com/api/v1/forex/USDSEK","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/USDSEK","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 402 x402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no usage examples, and the docs pages are empty. The listing is essentially a stub with only the payment challenge and landing page to work 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'000':47 '20':46 '402':193 '6':59 'FX rate API' 'USD SEK exchange rate' 'USDSEK rate' 'account':72 'actual':198 'ai/ml':108 'analyt':107 'api':38,70,101,151 'application/json':140 'avail':180 'base':8,20,48,54 'base-network' 'broader':98 'caller':79 'challeng':195 'confirm':188 'connect':159 'cost':44 'crawl':183 'currenc':133 'currency conversion' 'data':106,111 'decim':60 'detail':166 'doc':149 'document':141,175 'dollar to krona' 'enabl':37 'endpoint':26,93,124,186 'exampl':179 'exchang':31 'extrem':146 'finance/crypto':110 'foreign':30 'foreign exchange API' 'forex':2,14,123 'forex data' 'forex-rate' 'format':200 'handl':63 'header':86 'host':39 'includ':81 'infer':109 'inlin':64 'key':71 'krona':131 'limit':75 'live':189 'lowpaymentfee.com':41,104 'materi':184 'micropay':6,18 'micropayment' 'mime':137 'network':55 'no-api-key' 'offer':102 'openapi':170 'page':154 'pair':134 'part':95 'pay-per-request' 'payment':61,85,90,202 'per':11,23,120 'price':116,150 'prompt':161 'proof':91 'proper':192 'protocol':68 'provid':27 'rate':3,15,32,74 'readm':153 'render':156 'request':12,24,43,121 'request/response':173 'requir':77 'respons':136,199 'return':190 'schema':174 'sek':132 'servic':114 'simpli':80 'site':144 'span':105 'spars':147 'spec':171 'specif':125 'suit':99 'swedish':130 'target':126 'technic':165 'type':138 'uniform':117 'unit':49 'unknown':204 'usag':178 'usd':128 'usd-sek' 'usd/sek':1,13,29 'usdc':51,57 'usdc-settlement' 'use':58 'util':113 'valid':89 'via':4,16,65 'wallet':160 'x':84 'x-payment':83 'x402':5,17,36,67,194 'x402-enabled':35 'x402-payment'","prices":[{"id":"aad900bd-9dab-4974-97a1-52053821bdda","listingId":"12b2f2d6-1bd9-4ac7-a416-50e76707ae4d","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/USDSEK","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:46:53.268Z"}],"sources":[{"listingId":"12b2f2d6-1bd9-4ac7-a416-50e76707ae4d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/forex/USDSEK","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:53.268Z","lastSeenAt":"2026-04-29T13:05:03.376Z"}],"details":{"listingId":"12b2f2d6-1bd9-4ac7-a416-50e76707ae4d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/forex/USDSEK \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","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/USDSEK"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network.","source_url":"https://lowpaymentfee.com/api/v1/forex/USDSEK"},{"claim":"All APIs on the site are priced at $0.02 per request with no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"Finance & Web3 category includes price feeds and exchange rates endpoints.","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching the current USD/SEK exchange rate for financial applications","Integrating real-time forex data into trading bots or dashboards","Currency conversion calculations for e-commerce or invoicing in SEK","Agent-driven forex lookups without pre-registration or API keys"],"bestFor":["Agents or apps needing on-demand USD/SEK rates without signup","Micropayment-native workflows on Base L2","Low-friction, pay-per-call forex data access"],"notFor":["High-frequency trading requiring sub-second latency guarantees (no SLA documented)","Users needing comprehensive multi-pair forex feeds in a single call","Applications requiring detailed historical forex data or OHLC candles"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:17.309Z"},"updatedAt":"2026-04-29T13:05:03.376Z"}}