{"id":"b5dc5acc-d4b7-443e-b59e-0afd354834d2","shortId":"W3j5J4","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are pay-per-request using USDC on the Base network, settled via the x402 protocol. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/products/54` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing. The endpoint accepts POST requests and returns application/json.\n\nThe platform also advertises additional endpoint categories including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. Documentation pages exist but appear to require a wallet connection to view, so detailed request/response schemas are not available from the crawl.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","json-response","post-method"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["The specific purpose of /api/v1/products/54 ('Premium API Access') is not documented — it is unclear what data or service it provides.","All documentation, pricing, API, and README pages require wallet connection and contain no readable content.","No OpenAPI spec or request/response schema is available; integration requires trial and error.","The platform lists many endpoint categories but none have publicly visible documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/54","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/products/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI schema, no request/response examples, and the docs pages all require wallet connection, leaving the actual functionality of '/api/v1/products/54' (labeled generically as 'Premium API Access') unclear. The platform lists many endpoints but provides no documentation on what inputs they accept or what they 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'/request':13,32,192 '0.02':12,31,141,191 '000':124 '0x8335':129 '20':123 '2913':130 '402':118 '6':136 'Base network API' 'USDC API' 'accept':154 'access':114 'addit':164 'advertis':149,163 'ai/ml':57 'also':162 'analysi':169 'analyt':56 'api':5,17,24,36,45,85,113 'appear':199 'application/json':159 'attach':96 'avail':213 'base':8,27,75,125,132 'broad':50 'call':4,23 'caller':94 'categori':166 'challeng':119 'classif':172 'commit':93 'connect':204 'consist':144 'convers':184 'crawl':216 'data':55,60 'decim':137 'detail':208 'document':195 'embed':173 'enabl':44 'endpoint':53,65,106,153,165 'estim':181 'exchang':176 'exist':197 'feed':175 'finance/web3':59 'flat':150 'gas':180 'generat':186 'geocod':182 'header':100 'includ':167 'infer':58 'infrastructur':62 'json-response' 'key':18,37,86 'limit':89 'list':110 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'micropayment API' 'network':9,28,76 'no-api-key' 'offer':48 'page':196 'pay':2,21,68 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':67 'payment':99 'per':3,22,69,142 'platform':6,25,46,161 'point':194 'post':155 'post-method' 'premium':112 'price':151,174,193 'protocol':81 'quot':179 'rate':88,177 'request':70,103,120,143,156 'request/response':209 'requir':19,38,201 'return':116,158 'schema':210 'sentiment':168 'set':51 'settl':77 'simpli':95 'sinc':133 'site':147 'span':54 'specif':105 'subscript':92 'summar':171 'text':170 'token':178 'translat':139 'unit':126 'usdc':15,34,72,128,134 'usdc-base' 'use':71,135 'util':63 'valid':183 'via':10,29,78 'view':206 'wallet':203 'x402':11,30,43,80,98 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"5e082fb4-bc60-43fb-83d2-9c254e0cbfab","listingId":"b5dc5acc-d4b7-443e-b59e-0afd354834d2","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/products/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:57.371Z"}],"sources":[{"listingId":"b5dc5acc-d4b7-443e-b59e-0afd354834d2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/54","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:57.371Z","lastSeenAt":"2026-04-23T16:30:38.190Z"}],"details":{"listingId":"b5dc5acc-d4b7-443e-b59e-0afd354834d2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/54 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The site advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/products/54 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/products/54"},{"claim":"The platform offers endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Paying per-call for miscellaneous utility endpoints (geocoding, validation, conversion)","Accessing AI inference endpoints (sentiment, summarization, classification) with crypto micropayments","Fetching financial data (prices, exchange rates, gas estimates) via x402"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers who want zero-commitment, pay-as-you-go API access","Use cases requiring no rate limits and instant access without signup"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume production workloads where $0.02/request adds up significantly","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.232Z"},"updatedAt":"2026-04-23T16:30:38.190Z"}}