{"id":"0c763022-5908-4a12-84cf-551c0d1d41e2","shortId":"WcK8bU","kind":"x402","title":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that exposes a variety 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 priced at $0.02 per request, payable in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/carts/73` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 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 with a 300-second timeout. No API keys or rate limits are advertised — access is purely pay-per-call.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The purpose of the `/api/v1/carts/73` endpoint specifically is unclear — it does not match any of the named endpoints on the landing page, so its actual functionality is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["llm","search","geo","finance"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api access","402 payment api"],"warnings":["No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'","No OpenAPI or request/response schema provided for any endpoint","The endpoint path /api/v1/carts/73 does not match any of the named endpoints listed on the landing page; its actual functionality is unclear","No information about data freshness, uptime guarantees, or rate limits beyond marketing claims of 'no rate limits'"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/73","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/73","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 402 challenge, confirming it accepts USDC payments on Base at $0.02/call. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the specific /api/v1/carts/73 endpoint doesn't correspond to any named API on the landing page, making its actual functionality 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'/request':17,34 '0.02':16,33,90,135 '000':124 '0x8335':129 '20':123 '2913':130 '300':151 '402':118 '402 payment api' '6':139 'access':114,162 'across':49 'actual':230 'advertis':161 'ai':10,27,59 'ai-inference' 'analysi':63 'analyt':53 'api':4,21,41,113,155,175 'base':7,24,98,125,132 'base network api' 'call':168 'categori':51 'challeng':119 'classif':66 'classification' 'connect':184 'content':190 'convers':83 'data':9,26,52,56 'data-analytics' 'decim':140 'detail':201 'doc':174 'document':169,202 'embed':67 'embeddings' 'enabl':40 'endpoint':14,31,48,86,106,205,211,223 'equal':134 'estim':77 'exact':147 'exampl':198 'exchang':72 'export':57 'expos':44 'extrem':171 'feed':71 'financ':11,28,68 'finance-data' 'four':50 'function':231 'gas':76 'generat':84 'geocod':81 'geocoding' 'given':136 'infrastructur':79 'insight':58 'key':156 'land':226 'learn':61 'limit':159 'list':110 'low payment fee' 'lowpaymentfee.com':35 'machin':60 'made':143 'match':218 'metric':54 'micropayment api' 'name':222 'network':99 'offer':8,25 'openapi':194 'page':179,227 'pay':166 'pay per call api' 'pay-per-cal':165 'pay-per-request' 'payabl':3,20,93 'payment':141 'per':91,167 'platform':5,22,42 'premium':112 'price':70,88,176 'prompt':186 'protocol':103 'pure':164 'purpos':207 'quot':75 'rate':73,158 'readm':178 'render':181 'report':55 'request':92,120 'request/response':197 'return':116 'schema':195 'scheme':148 'second':152 'sentiment':62 'sentiment-analysis' 'spars':172 'specif':105,212 'substant':189 'summar':65 'text':64 'text-summarization' 'timeout':153 'token':74 'unclear':214 'unit':126 'unknown':233 'usdc':95,128,137 'usdc api access' 'usdc-base' 'util':13,30,80 'utility-apis' 'valid':82 'varieti':46 'via':100,144 'wallet':185 'web3':69 'x402':2,19,39,102,146 'x402 api' 'x402-enabled':38 'x402-payable':1,18 'x402-payment'","prices":[{"id":"054fc764-5c28-4b9a-bd8d-b0689480f035","listingId":"0c763022-5908-4a12-84cf-551c0d1d41e2","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/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:46.997Z"}],"sources":[{"listingId":"0c763022-5908-4a12-84cf-551c0d1d41e2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/73","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:46.997Z","lastSeenAt":"2026-04-22T12:03:06.044Z"}],"details":{"listingId":"0c763022-5908-4a12-84cf-551c0d1d41e2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/73 \\\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 Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/carts/73 requests up to 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/carts/73"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates via micropayments","Geocoding and data validation as utility calls from automated workflows","Exporting analytics data or generating insights on a per-request basis"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse utility endpoints","Developers prototyping with low-cost API calls on Base","Web3-native applications that prefer crypto-settled API payments"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users who need well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.676Z"},"updatedAt":"2026-04-22T12:03:06.044Z"}}