{"id":"bc61549e-7876-4aa0-8964-a205185055ce","shortId":"cZwUXP","kind":"x402","title":"x402-gated API marketplace on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API marketplace on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API marketplace that offers a 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/carts/31` 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 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 and response schemas of these endpoints remain undocumented and unverified.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","cheap api access","no-key api"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all return only 'Connect wallet' with no substantive content","The specific endpoint /api/v1/carts/31 has no documented request or response schema; its actual functionality is unknown","No OpenAPI spec or ai-plugin manifest found","The relationship between /api/v1/carts/31 and the other advertised endpoints (analytics, AI, finance, utils) is unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/31","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/31","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 captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, and all doc pages return only 'Connect wallet' with no content. The purpose of the specific /carts/31 endpoint is unclear beyond the generic 'Premium API Access' label. Effectively a stub 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'/api/v1/carts/31':87 '/docs':179 '/pricing':180 '/readme':182 '/request':16,32,173 '0.02':15,31,118,172 '000':107 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':136 '0x8335':112 '20':106 '2913':113 '300':139 '6':123 'accept':95 'access':93 'actual':195 'addit':146 'address':135 'advertis':101,145 'ai':9,25 'ai-inference' 'ai/ml':50 'analysi':150 'analyt':8,24,49 'api':4,20,39,73,92 'base':7,23,69,108,115 'base usdc api' 'behavior':196 'broader':143 'challeng':100 'cheap api access' 'classif':153 'classification' 'collect':44 'commit':81 'connect':186 'content':192 'convers':165 'cost':104 'crypto-quotes' 'data':48,53 'data-analytics' 'decim':124 'document':177 'embed':154 'embeddings' 'enabl':38 'endpoint':13,29,46,59,85,147,202 'equal':117 'estim':162 'exact':131 'exchang':157 'feed':156 'financ':10,26 'finance-data' 'finance/web3':52 'gas':161 'gate':3,19 'general':55 'generat':167 'geocod':163 'geocoding' 'howev':176 'includ':148 'infer':51 'key':74 'limit':77 'list':89 'low payment fee' 'lowpaymentfee.com':33 'made':127 'marketplac':5,21,40 'maximum':103 'micropayment api' 'minimum':80 'network':70 'no-key api' 'offer':42 'page':178 'pay':62 'pay per call api' 'pay-per-request':61 'payment':125 'per':63,119 'platform':144 'point':175 'post':96 'premium':91 'price':155,174 'prompt':188 'quot':160 'rate':76,158 'remain':203 'request':64,97,120 'requir':82 'respons':198 'return':183 'schema':199 'scheme':132 'second':140 'sentiment':149 'sentiment-analysis' 'servic':57 'settl':133 'span':47 'specif':84 'substant':191 'summar':152 'text':151 'text-summarization' 'timeout':141 'token':159 'undocu':204 'unit':109 'unverifi':206 'usdc':66,111,121 'usdc-base' 'use':65,122 'util':12,28,56 'utility-apis' 'valid':164 'via':128 'wallet':187 'x402':2,18,37,99,130 'x402 api' 'x402-enabled':36 'x402-gated':1,17 'x402-payment'","prices":[{"id":"a6c96d34-653a-426a-bdc6-53c487d3709a","listingId":"bc61549e-7876-4aa0-8964-a205185055ce","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/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:39.713Z"}],"sources":[{"listingId":"bc61549e-7876-4aa0-8964-a205185055ce","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/31","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:39.713Z","lastSeenAt":"2026-04-23T12:05:08.079Z"}],"details":{"listingId":"bc61549e-7876-4aa0-8964-a205185055ce","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/31 \\\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/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/carts/31"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes and gas estimates via micropayment","Geocoding and data validation as lightweight utility calls","Exporting analytics data or generating reports on a per-request basis"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse API endpoints","Developers prototyping with low-cost, no-commitment API access","Web3-native applications already operating on Base with USDC"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.339Z"},"updatedAt":"2026-04-23T12:05:08.079Z"}}