{"id":"9a282bbe-55ee-4c08-b452-225b8b66029c","shortId":"e7UwLT","kind":"x402","title":"Pay-per-call API platform on Base with USDC payments via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base with USDC payments via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network. The x402 protocol means no API keys, no accounts, and no rate limits — callers simply attach a payment header to each request.\n\nThe specific endpoint at `/api/v1/invoices/15` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" payment scheme with a 300-second timeout.\n\nThe broader platform advertises endpoints for 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 price point. However, documentation beyond the landing page is extremely sparse (docs, pricing, and API pages all render only a \"Connect wallet\" prompt), so the actual functionality, request/response schemas, and data sources behind these endpoints are unverified.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","no-api-key"],"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":["Documentation pages (/docs, /pricing, /api, /README) are all effectively empty, rendering only 'Connect wallet'","No OpenAPI or schema available — request and response formats are unknown","The specific endpoint '/api/v1/invoices/15' has a generic description; its actual functionality is unverified","The platform lists many endpoint categories but none could be independently verified for functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/15","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/invoices/15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02. However, there is no OpenAPI schema, no request/response examples, and all documentation pages beyond the landing page are empty ('Connect wallet' only). The actual functionality behind '/api/v1/invoices/15' is unclear — the name 'Premium API Access' is generic and 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'/request':15,34 '0.02':14,33,72,129,184 '000':124 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':144 '20':123 '300':152 '402':118 '6':134 'access':114 'account':90 'across':58 'actual':210 'address':143 'advertis':158 'ai-inference' 'ai/ml':61 'analysi':162 'analyt':60 'api':5,17,24,36,45,87,113,199 'attach':97 'base':8,27,80,125,137 'base network api' 'behind':217 'beyond':189 'broad':50 'broader':156 'call':4,23 'caller':95 'catalog':51 'challeng':119 'classif':165 'classification' 'connect':205 'convers':177 'crypto-quotes' 'data':59,215 'data-analytics' 'decim':135 'doc':196 'document':188 'embed':166 'embeddings' 'enabl':44 'endpoint':57,68,106,159,219 'estim':174 'exact':147 'exchang':169 'extrem':194 'feed':168 'finance-data' 'finance/web3':63 'function':211 'gas':173 'generat':179 'geocod':175 'geocoding' 'header':100 'howev':187 'infer':62 'infrastructur':65 'key':18,37,88 'land':191 'limit':94 'list':110 'low payment fee' 'lowpaymentfee.com':39 'made':141 'mean':85 'micropayment api' 'network':81 'no-api-key' 'no-auth api' 'offer':48 'page':192,200 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':11,30,99,139,148 'per':3,22,55,73 'platform':6,25,46,157 'point':186 'premium':112 'price':70,167,185,197 'prompt':207 'protocol':84 'quot':172 'rate':93,170 'render':202 'request':56,74,103,120 'request/response':212 'requir':19,38 'return':116 'schema':213 'scheme':149 'second':153 'sentiment':161 'sentiment-analysis' 'settl':75 'simpli':96 'sinc':131 'sourc':216 'spars':195 'specif':105 'summar':164 'text':163 'text-summarization' 'timeout':154 'token':171 'unit':126 'unverifi':221 'usd':130 'usdc':10,29,77,128,132 'usdc api' 'usdc-base' 'use':133,145 'util':66 'valid':176 'via':12,31 'wallet':206 'x402':13,32,43,83 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"c7f8d259-1650-4587-82e6-18c4e54cbcbd","listingId":"9a282bbe-55ee-4c08-b452-225b8b66029c","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/invoices/15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:34.317Z"}],"sources":[{"listingId":"9a282bbe-55ee-4c08-b452-225b8b66029c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/15","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:34.317Z","lastSeenAt":"2026-04-23T17:31:09.255Z"}],"details":{"listingId":"9a282bbe-55ee-4c08-b452-225b8b66029c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/15 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/invoices/15"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/invoices/15"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto token quotes or gas estimates with per-call USDC micropayments","Geocoding or data validation as a utility service within automated workflows","Exporting analytics data or generating reports on a pay-as-you-go basis"],"bestFor":["Developers and agents wanting zero-signup, pay-per-use API access","Crypto-native applications that can settle in USDC on Base","Low-volume or bursty workloads where flat per-request pricing is economical"],"notFor":["High-volume production workloads needing SLAs, rate guarantees, or dedicated support","Users who need detailed API documentation and well-defined schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.395Z"},"updatedAt":"2026-04-23T17:31:09.255Z"}}