{"id":"0852df0e-1c17-46d6-b403-bc0165ea45d0","shortId":"GBC5PL","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 exposes a broad collection of 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 utilities (geocoding, validation, conversion, generation). All endpoints are pay-per-call with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint listed here (`/api/v1/carts/5`) is described as \"Premium API Access\" and returns a valid x402 challenge on POST. It accepts payment in USDC on the Base network. The maxAmountRequired is 20,000 base units, which at 6 decimals for USDC equals $0.02 per request — consistent with the site-wide pricing advertised on the landing page. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nDocumentation is extremely thin: the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The landing page lists many endpoints but provides no detail on request formats or response payloads. The `/api/v1/carts/5` path does not appear in the landing page's listed endpoints, making its specific purpose unclear beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api access","serverless api","no-auth api"],"warnings":["No OpenAPI or schema documentation available from the provider","The /api/v1/carts/5 endpoint is not listed among the advertised APIs on the landing page — its specific function is unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no usable content","No request body format or response schema is documented anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/5","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/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response documentation, no examples, and the specific /api/v1/carts/5 path is not explained on the site. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/carts/5':107,227 '/docs':176 '/pricing':178 '/readme':180 '/request':16,32 '0.02':15,31,145 '000':135 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':165 '20':134 '300':168 '6':140 'accept':123 'access':113,249 'across':48 'address':164 'advertis':155 'ai':9,25,58 'ai-inference' 'analysi':62 'analyt':8,24,52 'api':4,20,39,93,112,248 'appear':231 'avail':206 'base':7,23,129,136 'base network api' 'beyond':244 'broad':44 'call':90 'categori':50 'challeng':119 'classif':65 'classification' 'collect':45 'commit':100 'connect':186 'consist':148 'content':192 'convers':82 'crawl':209 'data':51,55 'data-analytics' 'decim':141 'describ':109 'detail':219 'document':171,201 'embed':66 'embeddings' 'enabl':38 'endpoint':13,29,47,85,104,215,238 'equal':144 'estim':76 'exampl':205 'exchang':71 'export':56 'expos':42 'extrem':173 'feed':70 'financ':10,26,67 'finance-data' 'format':222 'four':49 'gas':75 'gate':3,19 'generat':83 'generic':246 'geocod':80 'geocoding' 'infrastructur':78 'insight':57 'key':94 'label':250 'land':158,211,234 'learn':60 'limit':97 'list':105,213,237 'low payment fee' 'lowpaymentfee.com':33 'machin':59 'make':239 'mani':214 'maxamountrequir':132 'metric':53 'micropayment api' 'network':130 'no-api-key' 'no-auth api' 'openapi':196 'page':159,181,212,235 'path':228 'pay':88 'pay per call api' 'pay-per-cal':87 'pay-per-request' 'payload':225 'payment':124,160 'per':89,146 'platform':40 'post':121 'premium':111,247 'price':69,154 'prompt':188 'provid':217 'purpos':242 'quot':74 'rate':72,96 'render':183 'report':54 'request':147,221 'request/response':199 'requir':101 'respons':224 'return':115 'schema':200 'second':169 'sent':162 'sentiment':61 'sentiment-analysis' 'serverless api' 'site':152 'site-wid':151 'spec':197 'specif':103,241 'suit':5,21 'summar':64 'text':63 'text-summarization' 'thin':174 'timeout':170 'token':73 'unclear':243 'unit':137 'usag':204 'usdc':126,143 'usdc api access' 'usdc-base' 'util':12,28,79 'utility-apis' 'valid':81,117 'wallet':187 'web3':68 'wide':153 'x402':2,18,37,118 'x402 api' 'x402-enabled':36 'x402-gated':1,17 'x402-payment'","prices":[{"id":"bd8bc046-a335-442e-b069-82775a0d4943","listingId":"0852df0e-1c17-46d6-b403-bc0165ea45d0","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/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:53.507Z"}],"sources":[{"listingId":"0852df0e-1c17-46d6-b403-bc0165ea45d0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:53.507Z","lastSeenAt":"2026-04-22T21:30:30.927Z"}],"details":{"listingId":"0852df0e-1c17-46d6-b403-bc0165ea45d0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/5 \\\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 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 returns maxAmountRequired of 20000 base units in USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/carts/5"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with micropayment-gated access","Using utility services like geocoding, validation, and conversion without subscription commitments"],"bestFor":["Agents or applications that need on-demand API access without upfront registration","Developers prototyping with multiple API categories at minimal cost","Crypto-native workflows that can settle USDC payments on Base"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users who cannot transact in USDC on the Base network","Applications requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.408Z"},"updatedAt":"2026-04-22T21:30:30.927Z"}}