{"id":"cef59c0a-70e2-4ced-88c6-257f878e79e0","shortId":"Jx6g9b","kind":"x402","title":"x402-gated API collection on Base — pay $0.02 per request in USDC, no API keys required.","tagline":"x402-gated API collection on Base — pay $0.02 per request in USDC, no API keys required.","description":"lowpaymentfee.com hosts a suite of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, settled 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 at `/api/v1/collections/44` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x8335…2913 on Base, 6 decimals), which equals $0.02. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises endpoints in 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 (geocoding, validation, conversion, generation). Documentation pages exist but appear gated behind a wallet connection, so detailed request/response schemas are not publicly available.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-prices","exchange-rates","crypto-gas","geocoding","validation","conversion"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-api-key endpoint"],"warnings":["No public documentation — all doc pages return only a 'Connect wallet' prompt, so request/response schemas are unknown.","The purpose of /api/v1/collections/44 ('Premium API Access') is vague; it is unclear what data or service it returns.","No OpenAPI spec or AI plugin manifest is available.","No examples of successful responses could be gathered."],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/44","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/collections/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response format, and all docs pages are gated behind wallet connection, leaving the actual functionality of /collections/44 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'0.02':9,26,61,130 '000':116 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':137 '0x8335':122 '20':115 '2913':123 '300':140 '6':126 'accept':105 'access':103 'address':136 'advertis':111,146 'ai':158 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':51 'analysi':162 'analyt':50,152 'api':4,15,21,32,47,74,102 'appear':187 'asset':121 'attach':85 'avail':200 'base':7,24,69,117,125 'base network api' 'behind':189 'broader':144 'call':46 'caller':83 'categori':150 'challeng':110 'classif':165 'collect':5,22 'commit':82 'connect':192 'convers':181 'conversion' 'cost':60 'crypto-gas' 'data':49,54,151,155 'data-analytics' 'decim':127 'detail':194 'document':183 'embed':166 'endpoint':59,95,147 'equal':129 'estim':176 'everi':58 'exchang':171 'exchange-rates' 'exist':185 'export':156 'feed':170 'financ':167 'finance-prices' 'finance/web3':53 'four':149 'gas':175 'gate':3,20,188 'generat':182 'geocod':179 'geocoding' 'header':89 'host':36 'infer':52 'infrastructur':178 'insight':157 'key':16,33,75 'learn':160 'limit':78 'list':99 'low payment fee' 'lowpaymentfee.com':35 'machin':159 'maxamountrequir':113 'metric':153 'micropayment api' 'network':70 'no-api-key endpoint' 'page':184 'pay':8,25,44 'pay per call api' 'pay-per-cal':43 'pay-per-request' 'payment':88,132 'per':10,27,45,62 'platform':145 'post':106 'premium':101 'price':169 'protocol':42 'public':199 'quot':174 'rate':77,172 'report':154 'request':11,28,63,92,107 'request/response':195 'requir':17,34 'schema':196 'second':141 'sent':134 'sentiment':161 'servic':57 'settl':64 'simpli':84 'span':48 'specif':94 'subscript':81 'suit':38 'summar':164 'text':163 'timeout':142 'token':173 'unit':118 'usdc':13,30,66,120 'usdc api' 'usdc-base' 'util':56 'valid':180 'validation' 'wallet':191 'web3':168 'x402':2,19,41,87,109 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':40","prices":[{"id":"e6e2315d-e336-4568-bd2f-9c419296a8ae","listingId":"cef59c0a-70e2-4ced-88c6-257f878e79e0","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/collections/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-19T05:29:48.779Z"}],"sources":[{"listingId":"cef59c0a-70e2-4ced-88c6-257f878e79e0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T05:29:48.779Z","lastSeenAt":"2026-04-22T02:31:46.094Z"}],"details":{"listingId":"cef59c0a-70e2-4ced-88c6-257f878e79e0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/44 \\\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":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/collections/44 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/collections/44"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven data retrieval without managing API keys or subscriptions","On-demand AI inference (sentiment, summarization, classification, embeddings) paid per call","Fetching real-time crypto prices, gas estimates, and exchange rates via micropayment","Geocoding and data conversion utilities for automated pipelines"],"bestFor":["AI agents that need frictionless, keyless API access with crypto micropayments","Developers prototyping against multiple API categories without signup","Low-volume or bursty workloads where per-request pricing beats subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who cannot transact in USDC on the Base network","Applications requiring detailed SLAs, guaranteed uptime, or support contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.605Z"},"updatedAt":"2026-04-22T02:31:46.094Z"}}