{"id":"794a2200-36c5-4767-9d3f-ad8d71557448","shortId":"PC7Tjf","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers 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 `/api/v1/carts/13` 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). Payment is made via the x402 exact scheme, settling to the provider's wallet on Base. The timeout for payment is 300 seconds.\n\nThe broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. However, documentation pages (/docs, /pricing, /api, /README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior, input/output schemas, and data sources behind these endpoints remain undocumented and unverifiable.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per request api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["All documentation pages (/docs, /pricing, /api, /README) return only 'Connect wallet' with no usable content","No OpenAPI or schema documentation available — endpoint input/output formats are unknown","The specific endpoint /api/v1/carts/13 ('Premium API Access') is not listed among the advertised endpoints on the homepage, making its purpose unclear","Actual data sources and model quality behind AI and finance endpoints are unverifiable"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/13","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/carts/13","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 (all doc pages return only 'Connect wallet'), no example requests or responses, and the actual functionality behind /api/v1/carts/13 and the other listed endpoints is unverifiable. This is effectively a stub 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'/api/v1/carts/13':87 '/docs':185 '/pricing':186 '/readme':188 '/request':16,32,179 '0.02':15,31,118,178 '000':107 '0x8335':112 '20':106 '2913':113 '300':146 '402 payment api' '6':123 'accept':95 'access':93 'actual':201 'addit':152 'advertis':101,151 'ai':9,25 'ai-inference' 'ai/ml':51 'analysi':156 'analyt':8,24,50 'analytics' 'api':4,20,39,74,92 'base':7,23,70,108,115,140 'base network api' 'behavior':202 'behind':208 'broad':44 'broader':149 'call':120 'challeng':100 'classif':159 'classification' 'collect':45 'commit':82 'connect':192 'content':198 'convers':171 'cost':104 'crypto-data' 'data':49,54,206 'decim':124 'document':183 'embed':160 'embeddings' 'enabl':38 'endpoint':13,29,47,60,86,153,210 'equal':117 'estim':168 'exact':131 'exchang':163 'feed':162 'financ':10,26 'finance-data' 'finance/web3':53 'gas':167 'gate':3,19 'general':56 'generat':173 'geocod':169 'geocoding' 'howev':182 'includ':154 'infer':52 'input/output':203 'key':75 'limit':78 'list':89 'low payment fee' 'lowpaymentfee.com':33 'made':127 'maximum':103 'micropayment api' 'minimum':81 'network':71 'no-api-key' 'offer':42 'page':184 'pay':63 'pay per request api' 'pay-per-request':62 'payment':125,144 'per':64,119 'platform':40,150 'point':181 'post':96 'premium':91 'price':161,180 'prompt':194 'provid':136 'quot':166 'rate':77,164 'remain':211 'request':65,97 'requir':83 'return':189 'schema':204 'scheme':132 'second':147 'sentiment':155 'sentiment-analysis' 'servic':58 'settl':133 'sourc':207 'span':48 'specif':85 'substant':197 'suit':5,21 'summar':158 'text':157 'text-summarization' 'timeout':142 'token':165 'undocu':212 'unit':109 'unverifi':214 'usdc':67,111,121 'usdc api' 'usdc-base' 'use':66,122 'util':12,28,57 'utility' 'valid':170 'via':128 'wallet':138,193 'x402':2,18,37,99,130 'x402 api' 'x402-enabled':36 'x402-gated':1,17 'x402-payment'","prices":[{"id":"fbe1840e-4b99-4014-ac93-8cdabab6dcd4","listingId":"794a2200-36c5-4767-9d3f-ad8d71557448","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/carts/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:25.156Z"}],"sources":[{"listingId":"794a2200-36c5-4767-9d3f-ad8d71557448","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/13","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:25.156Z","lastSeenAt":"2026-04-23T15:00:44.951Z"}],"details":{"listingId":"794a2200-36c5-4767-9d3f-ad8d71557448","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/13 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints are priced at $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/carts/13 specifies maxAmountRequired of 20000 base units of USDC (USD Coin) on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/carts/13"},{"claim":"The platform advertises endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto token quotes, gas estimates, or exchange rates via micropayment","Running geocoding or data validation as a utility service with per-call billing","Exporting analytics data or generating insights reports on a pay-as-you-go basis"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse utility endpoints","Developers prototyping with low-cost, no-commitment API access on Base","Web3-native applications that already hold USDC on Base"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without USDC on the Base network or unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.871Z"},"updatedAt":"2026-04-23T15:00:44.951Z"}}