{"id":"60536697-6f71-4ef2-8541-b270abe384a8","shortId":"XYstKG","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 collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are pay-per-request using USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint at `/api/v1/messages/17` 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 request (USDC uses 6 decimals). Payment is made via the x402 exact scheme, settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises additional 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 (geocoding, validation, conversion, generation). All are priced at $0.02 per request. However, the specific functionality behind the `/api/v1/messages/17` path is not documented beyond the generic \"Premium API Access\" label, so its exact behavior is unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key","no-rate-limit"],"categories":["api-platform","general"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["The exact functionality of /api/v1/messages/17 is not documented — 'Premium API Access' is the only description available.","No OpenAPI spec, request schema, or response schema is provided.","Documentation pages (/api, /pricing, /README) returned no meaningful content during crawl.","The platform lists many endpoints on its homepage but none have detailed documentation visible in the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/17","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/messages/17","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and the specific functionality of /api/v1/messages/17 is undocumented beyond the generic 'Premium API Access' label. The crawled pages beyond the homepage returned only 'Connect wallet' with no useful 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'/request':19,38 '0.02':18,37,125,194 '000':114 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':143 '0x8335':119 '20':113 '2913':120 '300':146 '6':130 'accept':102 'access':100,213 'across':155 'addit':153 'address':142 'advertis':108,152 'ai':12,31,165 'ai/ml':57 'analysi':169 'analyt':56,159 'api':5,24,45,80,99,212 'base':8,27,76,115,122 'base network api' 'behavior':218 'behind':201 'beyond':208 'broad':50 'broader':150 'call':4,23 'categori':157 'challeng':107 'classif':172 'collect':51 'commit':88 'convers':188 'cost':111 'data':11,30,55,60,158,162 'decim':131 'document':207 'embed':173 'enabl':44 'endpoint':16,35,53,66,92,154 'equal':124 'estim':183 'exact':138,217 'exchang':178 'export':163 'feed':177 'financ':13,32,174 'finance/web3':59 'four':156 'function':200 'gas':182 'general':62 'generat':189 'generic':210 'geocod':186 'howev':197 'infer':58 'infrastructur':185 'insight':164 'key':81 'label':214 'learn':167 'limit':84 'list':96 'low payment fee' 'lowpaymentfee.com':39 'machin':166 'made':134 'maximum':110 'metric':160 'micropayment api' 'minimum':87 'network':77 'no-api-key' 'no-rate-limit' 'offer':10,29 'path':204 'pay':2,21,69 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':68 'payment':132 'per':3,22,70,126,195 'platform':6,25,46,151 'post':103 'post-endpoint' 'premium':98,211 'premium api access' 'price':176,192 'provid':48 'quot':181 'rate':83,179 'report':161 'request':71,104,127,196 'requir':89 'scheme':139 'second':147 'sentiment':168 'servic':64 'settl':140 'span':54 'specif':91,199 'summar':171 'text':170 'timeout':148 'token':180 'unclear':220 'unit':116 'usdc':9,28,73,118,128 'usdc api' 'usdc-base' 'use':72,129 'util':15,34,63 'valid':187 'via':135 'web3':175 'x402':43,106,137 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"0958dc7b-c236-460b-bf5a-529a868d505c","listingId":"60536697-6f71-4ef2-8541-b270abe384a8","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/messages/17","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.305Z"}],"sources":[{"listingId":"60536697-6f71-4ef2-8541-b270abe384a8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/17","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.305Z","lastSeenAt":"2026-04-22T02:32:06.684Z"}],"details":{"listingId":"60536697-6f71-4ef2-8541-b270abe384a8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/17 \\\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/messages/17"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Programmatic access to data, AI, finance, or utility endpoints with per-call USDC payments","Testing x402 payment flows on Base network"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with USDC on Base that need diverse utility endpoints","Projects exploring x402 protocol integration"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume use cases where $0.02/request adds up significantly compared to subscription-based alternatives"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.234Z"},"updatedAt":"2026-04-22T02:32:06.684Z"}}