{"id":"270538ed-a6ad-49f7-929f-74c56fba4af1","shortId":"kcrTQC","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 catalog 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 subscriptions required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/carts/39` 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 broader platform lists additional endpoints in categories such as sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more — all at the same $0.02 price point.\n\nDocumentation pages (/docs, /pricing, /api, /README) all resolve but render only a \"Connect wallet\" prompt, so detailed request/response schemas and usage examples are not publicly available. The endpoint is confirmed live via a valid 402 challenge response. Without deeper documentation or OpenAPI specs, the exact input parameters and response format for this particular cart endpoint remain unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-marketplace","ai","finance","utility"],"synonyms":["low payment fee","x402 api","pay per request api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' — no actual docs available","No OpenAPI or schema describing request parameters or response format for /api/v1/carts/39","The endpoint path '/api/v1/carts/39' with description 'Premium API Access' is generic and does not clearly indicate what data or service it provides","The platform lists many endpoint categories but it is unclear whether all are functional or placeholders"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/39","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and the landing page provides a catalog overview with pricing. However, all documentation pages render only 'Connect wallet' with no usable content, there is no OpenAPI spec, and no request/response schemas or examples are available for this specific 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'/api/v1/carts/39':97 '/docs':168 '/pricing':169 '/readme':171 '/request':16,32 '0.02':15,31,128,163 '000':117 '0x8335':122 '20':116 '2913':123 '402':200 '6':133 'accept':105 'access':103 'addit':139 'advertis':111 'ai':9,25 'ai-inference' 'ai/ml':51 'analysi':146 'analyt':8,24,50 'api':4,20,39,74,102 'attach':85 'avail':191 'base':7,23,70,118,125 'base network api' 'broad':44 'broader':136 'call':130 'caller':83 'cart':219 'catalog':45 'categori':142 'challeng':110,201 'classif':149 'classification' 'confirm':195 'connect':178 'cost':114 'crypto-data' 'data':49,54 'data-analytics' 'decim':134 'deeper':204 'detail':182 'document':166,205 'embed':150 'embeddings' 'enabl':38 'endpoint':13,29,47,60,95,140,193,220 'equal':127 'exact':210 'exampl':187 'exchang':153 'feed':152 'financ':10,26 'finance-data' 'finance/web3':53 'format':215 'gate':3,19 'general':56 'geocod':155 'geocoding' 'header':89 'infer':52 'input':211 'key':75 'limit':78 'list':99,138 'live':196 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':33 'maximum':113 'micropayment api' 'network':71 'no-api-key' 'offer':42 'openapi':207 'page':167 'paramet':212 'particular':218 'pay':63 'pay per request api' 'pay-per-request':62 'payment':88 'per':64,129 'platform':40,137 'point':165 'post':106 'premium':101 'price':151,164 'prompt':180 'public':190 'rate':77,154 'remain':221 'render':175 'request':65,92,107 'request/response':183 'requir':82 'resolv':173 'respons':202,214 'schema':184 'sentiment':145 'sentiment-analysis' 'servic':58 'simpli':84 'span':48 'spec':208 'specif':94 'subscript':81 'suit':5,21 'summar':148 'text':147 'text-summarization' 'unit':119 'unknown':222 'usag':186 'usdc':67,121,131 'usdc api' 'usdc-base' 'use':66,132 'util':12,28,57 'utility-services' 'valid':156,199 'via':197 'wallet':179 'without':203 'x402':2,18,37,87,109 'x402 api' 'x402-enabled':36 'x402-gated':1,17 'x402-payment'","prices":[{"id":"2cccaf65-2a5a-4c97-8500-a723122b2d53","listingId":"270538ed-a6ad-49f7-929f-74c56fba4af1","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:17.923Z"}],"sources":[{"listingId":"270538ed-a6ad-49f7-929f-74c56fba4af1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/39","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:17.923Z","lastSeenAt":"2026-04-22T21:30:31.964Z"}],"details":{"listingId":"270538ed-a6ad-49f7-929f-74c56fba4af1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/39 \\\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":"All endpoints are 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":"The x402 challenge for /api/v1/carts/39 advertises maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/39"},{"claim":"Platform offers endpoints in categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto quotes, gas estimates, or exchange rates with per-call USDC payments","Running geocoding, validation, or data conversion tasks via simple HTTP POST with x402 payment"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse API endpoints","Developers prototyping with low-cost, no-commitment API access on Base","Web3-native applications that prefer on-chain micropayments over traditional billing"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation and guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.364Z"},"updatedAt":"2026-04-22T21:30:31.964Z"}}