{"id":"ba7fe589-586d-4f9e-b4a3-36075d497157","shortId":"fuDczY","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/keys/58` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers attach an X-PAYMENT header with a signed USDC payment on Base.\n\nThe wider platform advertises four endpoint categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point. The platform claims no rate limits, no minimums, and instant access.\n\nImportant caveat: the specific endpoint `/api/v1/keys/58` does not clearly map to any of the named API categories on the landing page. Its description is simply \"Premium API Access,\" and no documentation, request/response schema, or examples are available. The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional content. Without knowing what this endpoint actually returns, callers should treat it as an opaque paid endpoint until further documentation is published.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api"],"warnings":["The endpoint /api/v1/keys/58 has no documented purpose beyond 'Premium API Access' — its actual functionality is unknown.","No OpenAPI spec, request schema, or response schema is available for any endpoint on the platform.","All documentation pages (pricing, README, /api) returned only a 'Connect wallet' prompt with no usable content.","The endpoint path '/keys/58' does not correspond to any of the named API categories on the landing page."],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/58","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/keys/58","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, no examples, and the specific endpoint's purpose ('Premium API Access') is vague. The docs/pricing/README pages all returned only 'Connect wallet' with no 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'/request':19,38,169 '0.02':18,37,80,168 '000':84 '20':83 '6':90 'access':75,182,210 'account':102 'actual':243 'addit':236 'advertis':124 'ai':12,31,135 'ai-inference' 'analysi':139 'analyt':129 'api':5,24,45,74,100,198,209 'attach':108 'avail':219 'base':8,27,63,85,120 'base network api' 'broad':50 'call':4,23,82 'caller':107,245 'catalog':51 'categori':127,199 'caveat':184 'claim':174 'classif':142 'classification' 'clear':191 'connect':231 'content':237 'convers':159 'cost':77 'crawl':221 'data':11,30,128,132 'data-analytics' 'decim':91 'descript':205 'doc':222 'document':213,256 'embed':143 'embeddings' 'enabl':44 'endpoint':16,35,57,67,126,162,187,242,253 'estim':153 'exampl':217 'exchang':148 'export':133 'feed':147 'financ':13,32,144 'finance-data' 'four':125 'gas':152 'generat':160 'geocod':157 'geocoding' 'handl':94 'header':113 'import':183 'infrastructur':155 'insight':134 'instant':181 'key':101 'know':239 'land':202 'learn':137 'limit':177 'list':71,164 'low payment fee' 'lowpaymentfee.com':39 'machin':136 'map':192 'metric':130 'micropayment api' 'minimum':179 'name':197 'network':64 'no-auth api' 'offer':10,29 'opaqu':251 'page':203,226 'paid':252 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':92,112,118 'per':3,22,55,81 'platform':6,25,46,123,173 'point':171 'premium':73,208 'price':146,170,223 'prompt':233 'protocol':98 'provid':48 'publish':258 'quot':151 'rate':149,176 'readm':225 'report':131 'request':56 'request/response':214 'requir':106 'return':228,244 'schema':215 'sentiment':138 'sentiment-analysis' 'settl':58 'sign':116 'simpli':207 'specif':66,186 'subscript':104 'summar':141 'text':140 'text-summarization' 'token':150 'treat':247 'unit':86 'usdc':9,28,60,88,117 'usdc api' 'usdc-base' 'util':15,34,156 'utility-apis' 'valid':158 'via':95 'wallet':232 'web3':145 'wider':122 'without':238 'x':111 'x-payment':110 'x402':43,97 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"77a34ef8-7c32-423b-b06c-d876aa4528c6","listingId":"ba7fe589-586d-4f9e-b4a3-36075d497157","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/keys/58","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.708Z"}],"sources":[{"listingId":"ba7fe589-586d-4f9e-b4a3-36075d497157","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/58","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.708Z","lastSeenAt":"2026-04-22T01:02:19.105Z"}],"details":{"listingId":"ba7fe589-586d-4f9e-b4a3-36075d497157","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/58 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/58"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time financial data such as token quotes, gas estimates, or exchange rates via micropayment","Geocoding or data validation as a utility service paid per request in USDC on Base"],"bestFor":["AI agents with Base USDC wallets needing frictionless API access","Developers who want pay-as-you-go pricing without subscriptions or rate limits","Web3-native applications that prefer on-chain settlement for API calls"],"notFor":["High-volume batch workloads where $0.02/request adds up quickly","Users who need detailed API documentation or SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.393Z"},"updatedAt":"2026-04-22T01:02:19.105Z"}}