{"id":"8ba67e49-8706-409c-b13d-08c51bdb110d","shortId":"e8scs9","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/transfers/170` is listed as \"Premium API Access\" and accepts POST requests with an x402 payment challenge. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe platform advertises four categories of APIs: 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 priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nHowever, the specific endpoint being listed (`/api/v1/transfers/170`) does not clearly map to any of the documented API categories. Its description is simply \"Premium API Access,\" and there is no documentation explaining what data or functionality it returns. The docs, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. Without an OpenAPI schema, example requests, or response documentation, the actual behavior of this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api-platform","finance","llm","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["The endpoint path '/api/v1/transfers/170' does not correspond to any documented API category on the site","All documentation pages (docs, pricing, README, api) render only 'Connect wallet' with no usable content","No OpenAPI schema, request format, or response format is available","The actual functionality behind 'Premium API Access' is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/170","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/transfers/170","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns 402 as expected for x402), but there is no OpenAPI schema, no request/response examples, and no documentation beyond a wallet-connect prompt. The specific endpoint '/api/v1/transfers/170' has no clear description of what it does. Pricing is clear ($0.02/request in USDC on Base), but the lack of any functional documentation makes this effectively a 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'0.02':94,142 '000':85 '20':84 '6':90 'accept':71 'access':69,181 'actual':221 'advertis':99 'ai':12,28,111 'amount':81 'analysi':115 'analyt':105 'api':5,21,39,68,103,147,173,180 'base':8,24,57,86 'base network api' 'base-network' 'behavior':222 'broad':44 'call':4,20 'catalog':45 'categori':101,174 'challeng':78 'classif':118 'clear':166 'commit':155 'connect':204 'content':210 'convers':135 'cover':10,26 'data':11,27,104,108,189 'decim':91 'descript':176 'doc':195 'document':172,186,219 'embed':119 'enabl':38 'endpoint':16,32,51,61,138,160,225 'equal':93 'estim':129 'exampl':215 'exchang':124 'explain':187 'export':109 'feed':123 'financ':13,29,120 'four':100 'function':191 'gas':128 'generat':136 'geocod':133 'howev':157 'infrastructur':131 'insight':110 'key':148 'learn':113 'limit':151 'list':65,162 'low payment fee' 'lowpaymentfee.com':33 'machin':112 'map':167 'maximum':80 'metric':106 'micropayment api' 'minimum':154 'network':58 'no-api-key' 'offer':42 'openapi':213 'page':199 'pay':2,18,48 'pay per call api' 'pay-per-cal':1,17 'pay-per-request':47 'payment':77 'per':3,19,49,95,143 'platform':6,22,40,98 'post':72 'post-method' 'premium':67,179 'premium api access' 'price':122,140,196 'prompt':206 'quot':127 'rate':125,150 'readm':198 'remain':226 'render':201 'report':107 'request':50,73,96,144,216 'requir':82,156 'respons':218 'return':193 'schema':214 'sentiment':114 'settl':52 'simpli':178 'specif':60,159 'summar':117 'text':116 'token':126 'unclear':227 'unit':87 'usdc':9,25,54,89 'usdc api' 'usdc-settlement' 'util':15,31,132 'valid':134 'wallet':205 'web3':121 'without':211 'x402':37,76 'x402 api' 'x402-enabled':36 'x402-payment'","prices":[{"id":"0cca208f-f13e-45f4-b119-5784bf274c80","listingId":"8ba67e49-8706-409c-b13d-08c51bdb110d","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/transfers/170","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:35.620Z"}],"sources":[{"listingId":"8ba67e49-8706-409c-b13d-08c51bdb110d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/170","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:35.620Z","lastSeenAt":"2026-04-22T15:02:24.267Z"}],"details":{"listingId":"8ba67e49-8706-409c-b13d-08c51bdb110d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/170 \\\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 platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"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":"The x402 challenge specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/170"}],"useCases":["Paying per-call for data analytics or AI inference without subscription commitments","Accessing financial price feeds and exchange rates via micropayments","Using utility services like geocoding or validation on a per-request basis"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","Agent workflows that need x402-native endpoints on Base","Projects needing low-cost per-request pricing without API key management"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where subscription pricing would be cheaper","Anyone requiring non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.579Z"},"updatedAt":"2026-04-22T15:02:24.267Z"}}