{"id":"099c0570-d395-4441-80bb-c1933fce9747","shortId":"Jncunz","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 across four 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 priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/inbox/11` is listed as \"Premium API Access\" and its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is made per-call with no API keys, no rate limits, and no minimum commitments required. The x402 challenge uses the \"exact\" scheme with a 300-second timeout.\n\nNote that while the landing page lists many endpoints across multiple categories, the specific function of `/api/v1/inbox/11` (\"Premium API Access\") is not clearly documented — it does not correspond to any of the named endpoints on the homepage. There is no OpenAPI schema, no detailed request/response documentation, and the pricing, README, and API pages behind the site require a wallet connection and yielded no useful content. The actual capabilities of this particular endpoint remain unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key","no-rate-limit"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","premium api access"],"warnings":["The specific function of /api/v1/inbox/11 ('Premium API Access') is not documented and does not match any named endpoint on the homepage.","No OpenAPI schema or request/response examples are available.","Pricing, README, and API documentation pages require wallet connection and returned no content.","The broad catalog of endpoints listed on the homepage could not be individually verified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/11","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/inbox/11","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response documentation, and the specific purpose of /api/v1/inbox/11 is undocumented. The crawled pages beyond the homepage returned only 'Connect wallet' with no useful 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'/request':19,38 '0.02':18,37,99,142 '000':132 '0x8335':137 '20':131 '300':175 '6':146 'access':122,197 'across':58,187 'actual':244 'advertis':127 'ai':12,31,68 'analysi':72 'analyt':62 'api':5,24,45,121,156,196,229 'base':8,27,107,133,139 'base network api' 'behind':231 'broad':50 'call':4,23,153 'capabl':245 'catalog':51 'categori':60,189 'challeng':126,168 'classif':75 'clear':200 'commit':164 'connect':237 'content':242 'convers':92 'correspond':205 'data':11,30,61,65 'decim':147 'detail':221 'document':201,223 'embed':76 'enabl':44 'endpoint':16,35,57,95,115,186,211,249 'equal':141 'estim':86 'exact':171 'exchang':81 'export':66 'feed':80 'financ':13,32,77 'four':59 'function':192 'gas':85 'generat':93 'geocod':90 'given':143 'homepag':214 'infrastructur':88 'insight':67 'key':157 'land':182 'learn':70 'limit':160 'list':118,184 'low payment fee' 'lowpaymentfee.com':39 'machin':69 'made':150 'mani':185 'maxamountrequir':129 'metric':63 'micropayment api' 'minimum':163 'multipl':188 'name':210 'network':108 'no-api-key' 'no-rate-limit' 'note':178 'offer':10,29 'openapi':218 'page':183,230 'paid':102 'particular':248 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':148 'per':3,22,55,100,152 'per-cal':151 'platform':6,25,46 'post-endpoint' 'premium':120,195 'premium api access' 'price':79,97,226 'protocol':112 'provid':48 'quot':84 'rate':82,159 'readm':227 'remain':250 'report':64 'request':56,101 'request/response':222 'requir':165,234 'schema':219 'scheme':172 'second':176 'sentiment':71 'site':233 'specif':114,191 'summar':74 'text':73 'timeout':177 'token':83 'unclear':251 'unit':134 'usdc':9,28,104,136,144 'usdc api' 'usdc-base' 'use':169,241 'util':15,34,89 'valid':91 'via':109 'wallet':236 'web3':78 'x402':43,111,125,167 'x402 api' 'x402-enabled':42 'x402-payment' 'yield':239","prices":[{"id":"afd8e95e-741f-4535-808a-f03bf88c6548","listingId":"099c0570-d395-4441-80bb-c1933fce9747","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/inbox/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:19.983Z"}],"sources":[{"listingId":"099c0570-d395-4441-80bb-c1933fce9747","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:19.983Z","lastSeenAt":"2026-04-22T16:32:47.940Z"}],"details":{"listingId":"099c0570-d395-4441-80bb-c1933fce9747","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/11 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/11"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API endpoints without traditional API key management","Agent-driven workflows that need on-demand API calls settled via crypto micropayments","Accessing data, AI inference, finance, or utility services at low per-request cost"],"bestFor":["Developers and agents wanting frictionless pay-per-use API access on Base","Use cases requiring no signup, no rate limits, and instant access","Crypto-native applications that can settle USDC payments on Base"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume use cases where per-request pricing may not be cost-effective compared to subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.747Z"},"updatedAt":"2026-04-22T16:32:47.940Z"}}