{"id":"12b8e4d2-f6cb-40f0-9e53-3953b951a927","shortId":"wNdA3S","kind":"x402","title":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","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. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or upfront commitments required.\n\nThe specific endpoint at `/api/v1/carts/1` 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 given USDC's 6 decimals. Payment is made via the x402 exact scheme, settling to the provider's wallet on Base.\n\nThe platform advertises four endpoint 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). Documentation pages exist at /docs, /pricing, and /api but currently render only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas for individual endpoints are unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["llm","data","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","data analytics api","ai inference api","crypto price api"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet' with no content","Request and response schemas for all endpoints are completely undocumented","The specific endpoint /api/v1/carts/1 ('Premium API Access') is not listed among the advertised endpoints on the homepage, making its purpose unclear","No SLA, rate limit, or uptime guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/1","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/1","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 USDC on Base), but there is no OpenAPI schema, no documented request/response formats, and all docs/pricing/API pages render only a wallet-connect prompt. The specific /api/v1/carts/1 endpoint's purpose beyond 'Premium API Access' is unknown. Effectively a stub 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'/api/v1/carts/1':94 '/call':19,38 '/docs':189 '/pricing':190 '0.02':18,37,70,125 '000':114 '0x8335':119 '20':113 '2913':120 '6':129 'accept':102 'access':100 'actual':207 'advertis':108,149 'ai':12,31,160 'ai inference api' 'ai-inference' 'ai/ml':57 'analysi':164 'analyt':56,154 'api':5,24,45,82,99 'base':8,27,78,115,122,146 'base network api' 'broad':50 'categori':152 'challeng':107 'classif':167 'classification' 'collect':51 'commit':88 'connect':198 'content':204 'convers':183 'conversion' 'cost':111 'crypto price api' 'crypto-quotes' 'current':194 'data':11,30,55,60,153,157 'data analytics api' 'data-analytics' 'decim':130 'document':185 'embed':168 'embeddings' 'enabl':44 'endpoint':16,35,53,66,92,151,212 'equal':124 'estim':178 'everi':65 'exact':137 'exchang':173 'exist':187 'export':158 'feed':172 'financ':13,32,169 'finance-data' 'finance/web3':59 'four':150 'gas':177 'gas-estimates' 'general':62 'generat':184 'geocod':181 'geocoding' 'given':126 'individu':211 'infer':58 'infrastructure/utilities':180 'insight':159 'key':83 'learn':162 'limit':85 'list':96 'low payment fee' 'lowpaymentfee.com':39 'machin':161 'made':133 'maximum':110 'metric':155 'micropayment api' 'network':79 'offer':48 'page':186 'paid':73 'pay':2,21 'pay per call api' 'pay-per-request':1,20 'payment':131 'per':3,22,71 'platform':46,148 'post':103 'premium':98 'price':68,171 'prompt':200 'provid':142 'quot':176 'rate':84,174 'render':195 'report':156 'request':4,23,72,104 'request/response':208 'requir':89 'schema':209 'scheme':138 'sentiment':163 'sentiment-analysis' 'servic':64 'settl':139 'span':54 'specif':91 'substant':203 'suit':6,25 'summar':166 'text':165 'text-summarization' 'token':175 'unit':116 'unknown':214 'upfront':87 'usdc':75,118,127 'usdc api' 'usdc-base' 'util':15,34,63 'valid':182 'validation' 'via':9,28,134 'wallet':144,199 'web3':170 'x402':10,29,43,106,136 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"276387d8-508c-4fc8-879e-224f484cdb3a","listingId":"12b8e4d2-f6cb-40f0-9e53-3953b951a927","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/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:16.442Z"}],"sources":[{"listingId":"12b8e4d2-f6cb-40f0-9e53-3953b951a927","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:16.442Z","lastSeenAt":"2026-04-23T14:30:38.277Z"}],"details":{"listingId":"12b8e4d2-f6cb-40f0-9e53-3953b951a927","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/1 \\\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 priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Payment settles in USDC on the Base network via x402 exact scheme","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/1"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto token quotes and gas estimates for DeFi workflows","Running geocoding or data validation as part of an automated pipeline with per-call billing","Exporting analytics data or generating reports via a simple pay-per-request model","Prototyping applications that need multiple utility endpoints without subscription overhead"],"bestFor":["AI agents and bots that can settle payments in USDC on Base via x402","Developers who want zero-commitment, pay-as-you-go access to diverse API categories","Web3-native applications that prefer on-chain micropayments over traditional billing"],"notFor":["High-volume production workloads where $0.02/request adds up (no volume discounts documented)","Users who need detailed API documentation, request/response schemas, or SLA guarantees","Teams that cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.426Z"},"updatedAt":"2026-04-23T14:30:38.277Z"}}