{"id":"fcdfe773-cf2c-4ff0-9ba5-c8173e33a102","shortId":"8wgatE","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is an x402-enabled API marketplace that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach an X-PAYMENT header with a signed USDC payment, and the server fulfills the request upon verification.\n\nThe specific endpoint at `/api/v1/products/67` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe site lists 16 endpoints organized into 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. The exact functionality behind the `/api/v1/products/67` path is unclear — it may be a generic product endpoint or an alias for one of the listed services.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","crypto-gas-estimates"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api","crypto api marketplace"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all appear gated behind wallet connection and return no useful content.","The exact purpose and expected request/response schema of /api/v1/products/67 is unclear — it does not match any of the 16 listed endpoint paths on the homepage.","No OpenAPI spec or detailed API documentation is publicly available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/67","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/products/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response format for this specific endpoint, and docs pages are gated behind wallet connection. The purpose of /api/v1/products/67 specifically is 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'/call':13,28 '0.02':12,27,57,138 '000':127 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':150 '0x8335':132 '16':159 '20':126 '2913':133 '300':153 '402 payment api' '6':142 'accept':116 'access':114 'across':45 'address':149 'advertis':122 'ai':172 'ai-inference' 'ai/ml':48 'alia':233 'analysi':176 'analyt':47,166 'api':5,20,37,69,113 'appear':201 'attach':85 'avail':214 'base':8,23,65,128,135 'base network api' 'behind':203,218 'caller':84 'categori':164 'challeng':121 'classif':179 'classification' 'commit':76 'connect':206 'convers':195 'cost':56 'crypto api marketplace' 'crypto-gas-estimates' 'data':46,165,169 'data-analytics' 'decim':143 'detail':208 'document':197 'embed':180 'embeddings' 'enabl':36 'endpoint':44,55,106,160,230 'equal':137 'estim':190 'everi':54 'exact':216 'exchang':185 'exist':199 'export':170 'feed':184 'financ':181 'finance-data' 'finance/web3':50 'four':163 'fulfil':99 'function':217 'gas':189 'gate':202 'generat':196 'generic':228 'geocod':193 'geocoding' 'given':139 'handl':81 'header':90 'infer':49 'infrastructur':52,192 'inlin':83 'insight':171 'key':70 'learn':174 'limit':73 'list':110,158,238 'low payment fee' 'lowpaymentfee.com':31 'machin':173 'marketplac':38 'maxamountrequir':124 'may':225 'metric':167 'micropayment api' 'network':9,24,66 'no-api-key' 'offer':40 'one':235 'organ':161 'page':198 'paid':60 'path':221 'pay':2,17 'pay per call api' 'pay-per-request':1,16 'payment':82,89,95,145 'per':3,18,58 'platform':6,21 'post':117 'premium':112 'price':183 'product':229 'protocol':80 'public':213 'quot':188 'rate':72,186 'report':168 'request':4,19,59,101,118 'request/response':209 'requir':77 'schema':210 'second':154 'sent':147 'sentiment':175 'sentiment-analysis' 'server':98 'servic':239 'sign':93 'site':157 'specif':105 'summar':178 'text':177 'text-summarization' 'timeout':155 'token':187 'unclear':223 'unit':129 'upon':102 'usdc':15,30,62,94,131,140 'usdc api' 'usdc-base-network' 'util':53 'valid':194 'varieti':42 'verif':103 'via':10,25 'wallet':205 'web3':182 'x':88 'x-payment':87 'x402':11,26,35,79,120 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"8d0a0ab4-0a31-465a-aad3-0cc031595ebc","listingId":"fcdfe773-cf2c-4ff0-9ba5-c8173e33a102","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/products/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:42.689Z"}],"sources":[{"listingId":"fcdfe773-cf2c-4ff0-9ba5-c8173e33a102","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/67","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:42.689Z","lastSeenAt":"2026-04-23T15:00:45.708Z"}],"details":{"listingId":"fcdfe773-cf2c-4ff0-9ba5-c8173e33a102","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/67 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site offers 16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge shows maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/products/67"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto gas estimates or token quotes with per-call USDC micropayments","Geocoding or data validation as a utility service paid per request on Base"],"bestFor":["AI agents with Base USDC wallets needing frictionless API access","Developers who want pay-as-you-go pricing without subscriptions or rate limits","Web3-native applications that prefer on-chain payment settlement"],"notFor":["High-volume batch processing where per-call pricing adds up quickly","Users without a Base network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.017Z"},"updatedAt":"2026-04-23T15:00:45.708Z"}}