{"id":"d5cd8c81-db38-4fe3-9e3c-b726b1d52189","shortId":"zZ8S3C","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/policies/99` is listed as \"Premium API Access\" and returns `application/json`. Its x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and is discoverable.\n\nThe broader platform advertises categories including 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 (geocoding, validation, conversion, generation). Documentation pages exist but appear to require wallet connection and contain no substantive content in the crawl. No OpenAPI schema, request/response examples, or detailed endpoint documentation were found.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","json-api","no-api-key","no-rate-limits","data-analytics","ai-inference","finance-data","web3-data","geocoding","text-summarization","sentiment-analysis","embeddings"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","402 payment api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all appear to require wallet connection and contain no readable content","No OpenAPI or JSON schema available for any endpoint","The specific purpose of /api/v1/policies/99 ('Premium API Access') is not explained — it is unclear what data or functionality it provides","No request body schema or response examples are available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/99","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/policies/99","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 challenge, but there is no OpenAPI schema, no request/response examples, and documentation pages are empty (wallet-gated). The purpose of the specific /api/v1/policies/99 endpoint is unclear beyond the generic 'Premium API Access' label. Pricing is clear but endpoint behavior is not 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'/request':13,28 '0.02':12,27,63,125 '000':114 '0x8335':119 '20':113 '2913':120 '402 payment api' '6':129 'accept':133 'access':101 'account':75 'advertis':108,142 'ai':152 'ai-inference' 'ai/ml':48 'amount':111 'analysi':156 'analyt':47,146 'api':5,20,37,73,100 'appear':181 'application/json':104 'attach':83 'base':8,23,70,115,122 'base network api' 'broader':140 'call':4,19 'caller':81 'categori':143 'challeng':107 'classif':159 'connect':185 'contain':187 'content':190 'convers':175 'crawl':193 'data':46,51,145,149 'data-analytics' 'decim':130 'detail':200 'discover':138 'document':177,202 'embed':160 'embeddings' 'enabl':36 'endpoint':44,56,93,132,201 'equal':124 'estim':170 'exampl':198 'exchang':165 'exist':179 'export':150 'feed':164 'financ':161 'finance-data' 'finance/web3':50 'found':204 'gas':169 'generat':176 'geocod':173 'geocoding' 'given':126 'header':87 'includ':144 'infer':49 'infrastructur':53,172 'insight':151 'json-api' 'key':74 'learn':154 'limit':78 'list':97 'low payment fee' 'lowpaymentfee.com':31 'machin':153 'max':110 'metric':147 'micropayment api' 'network':9,24,71 'no-api-key' 'no-rate-limits' 'offer':40 'openapi':195 'page':178 'pay':2,17,59 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':58 'payment':86 'per':3,18,60 'per-request-billing' 'platform':6,21,38,141 'post':134 'premium':99 'price':163 'quot':168 'rate':77,166 'report':148 'request':61,90,135 'request/response':197 'requir':80,183 'return':103 'schema':196 'sentiment':155 'sentiment-analysis' 'settl':65 'simpli':82 'span':45 'specif':92 'substant':189 'summar':158 'text':157 'text-summarization' 'token':167 'unit':116 'usdc':15,30,67,118,127 'usdc api' 'usdc-base' 'util':54 'valid':174 'varieti':42 'via':10,25 'wallet':184 'web3':162 'web3-data' 'x402':11,26,35,85,106 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"7def0c9f-c755-4ac0-9686-0d943f973f1d","listingId":"d5cd8c81-db38-4fe3-9e3c-b726b1d52189","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/policies/99","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:17.045Z"}],"sources":[{"listingId":"d5cd8c81-db38-4fe3-9e3c-b726b1d52189","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/99","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:17.045Z","lastSeenAt":"2026-04-22T15:01:45.542Z"}],"details":{"listingId":"d5cd8c81-db38-4fe3-9e3c-b726b1d52189","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/99 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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 (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/policies/99"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","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, and exchange rates with per-call payment","Running data analytics queries and exporting reports via pay-as-you-go endpoints","Geocoding, validation, and data conversion utilities for automated workflows"],"bestFor":["AI agents needing keyless, pay-per-call API access","Developers who want to avoid subscription commitments for low-volume usage","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-request pricing at $0.02 adds up significantly","Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.662Z"},"updatedAt":"2026-04-22T15:01:45.542Z"}}