{"id":"96d0f1a5-b2d8-4cc3-9ccd-6568138746f3","shortId":"DbUsZe","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that hosts a collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are pay-per-request using the x402 protocol, settling in USDC on the Base network. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint `/api/v1/claims/28` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). The platform's landing page confirms a uniform $0.02/request pricing across all listed endpoints.\n\nThe broader platform advertises endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. However, documentation pages (docs, pricing, README) returned only a wallet-connect prompt with no substantive content, so the actual behavior and schemas of these endpoints remain unverified beyond the x402 challenge.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","cheap api access","no-api-key endpoint"],"warnings":["Documentation pages (/docs, /pricing, /README, /api) returned no substantive content — only a wallet-connect prompt.","The specific behavior and expected input/output of /api/v1/claims/28 is undocumented; 'Premium API Access' is a generic label.","No OpenAPI spec or request/response schema is available for any endpoint.","The breadth of advertised endpoints (AI, finance, geocoding, etc.) cannot be verified from available material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/28","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/claims/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documentation content (all doc pages return only a wallet-connect prompt), no request/response examples, and the specific purpose of /api/v1/claims/28 is unclear beyond the generic 'Premium API Access' label. This is effectively a stub 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'/request':17,34,150 '0.02':16,33,134,149 '000':123 '0x8335':128 '20':122 '2913':129 '6':139 'accept':111 'access':109 'across':152 'actual':205 'advertis':117,159 'ai':10,27 'ai-inference' 'ai/ml':52 'analysi':168 'analyt':51 'api':4,21,41,81,108 'attach':92 'base':7,24,76,124,131 'base usdc api' 'behavior':206 'beyond':214 'broader':157 'call':136 'caller':90 'challeng':116,217 'cheap api access' 'classif':171 'classification' 'collect':46 'commit':89 'confirm':146 'connect':197 'content':202 'convers':183 'cost':120 'crypto-data' 'data':9,26,50,55,164 'data-analytics' 'decim':140 'doc':189 'document':187 'embed':172 'embeddings' 'enabl':40 'endpoint':14,31,48,61,102,155,160,211 'equal':133 'estim':180 'exchang':175 'export':165 'feed':174 'financ':11,28 'finance-data' 'finance/web3':54 'gas':179 'gate':3,20 'general':57 'generat':185 'geocod':181 'geocoding' 'header':96 'host':44 'howev':186 'infer':53 'insight':166 'key':82 'land':144 'limit':85 'list':105,154 'low payment fee' 'lowpaymentfee.com':35 'maximum':119 'metric':162 'micropayment api' 'network':77 'no-api-key endpoint' 'offer':8,25 'page':145,188 'pay':64 'pay per call api' 'pay-per-request':63 'payment':95 'per':65,135 'platform':5,22,42,142,158 'post':112 'premium':107 'price':151,173,190 'prompt':198 'protocol':70 'quot':178 'rate':84,176 'readm':191 'remain':212 'report':163 'request':66,99,113 'return':192 'schema':208 'sentiment':167 'sentiment-analysis' 'servic':59 'settl':71 'simpli':91 'span':49 'specif':101 'subscript':88 'substant':201 'summar':170 'text':169 'text-summarization' 'token':177 'uniform':148 'unit':125 'unverifi':213 'usdc':73,127,137 'usdc-base' 'use':67,138 'util':13,30,58 'utility-services' 'valid':182 'wallet':196 'wallet-connect':195 'x402':2,19,39,69,94,115,216 'x402 api' 'x402-enabled':38 'x402-gated':1,18 'x402-payment'","prices":[{"id":"a250ba7a-9ad5-4fe7-a2e7-caa1362d1ade","listingId":"96d0f1a5-b2d8-4cc3-9ccd-6568138746f3","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/claims/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:44.064Z"}],"sources":[{"listingId":"96d0f1a5-b2d8-4cc3-9ccd-6568138746f3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/28","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:44.064Z","lastSeenAt":"2026-04-23T06:31:03.324Z"}],"details":{"listingId":"96d0f1a5-b2d8-4cc3-9ccd-6568138746f3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/28 \\\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":"Uniform pricing of $0.02 per request across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/28"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/claims/28"},{"claim":"Platform lists endpoints for analytics, AI, finance, and utility categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto and finance data (prices, exchange rates, gas estimates) on a per-call basis","Running utility operations like geocoding, validation, and data conversion with micropayments","Integrating pay-per-request data analytics and reporting into agent workflows"],"bestFor":["AI agents that need low-friction, keyless access to diverse API capabilities","Developers prototyping with multiple API categories without subscription overhead","Web3-native applications already operating on the Base network"],"notFor":["High-volume production workloads where per-request pricing adds up significantly","Users who need detailed API documentation and guaranteed SLAs before integration","Applications requiring non-USDC or non-Base payment settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.745Z"},"updatedAt":"2026-04-23T06:31:03.324Z"}}