{"id":"164a2d24-560a-4ae8-a24a-346da773a402","shortId":"SRrFgW","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402 protocol API platform that provides a collection of pay-per-request 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, paid in USDC on the Base network.\n\nThe specific endpoint `/api/v1/cards/22` is listed as \"Premium API Access\" and returns a live x402 challenge requiring payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is settled on-chain via the x402 exact scheme. No API keys or rate limits are advertised — access is gated purely by the x402 payment header.\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 description of what the `/api/v1/cards/22` endpoint actually returns. The platform's landing page lists many endpoints but provides no detail on input parameters or output formats for any of them.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","402 payment api","lowpaymentfee"],"warnings":["No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'","No OpenAPI or output schema provided; request and response formats are unknown","The specific endpoint /api/v1/cards/22 is not listed among the advertised endpoints on the landing page — its purpose is unclear","No information on rate limits, uptime guarantees, or data freshness"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/22","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/cards/22","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, confirming pricing and payment details. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what /api/v1/cards/22 actually returns. The endpoint path ('cards/22') gives no semantic clue about its 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'/request':17,34 '0.02':16,33,93,136 '000':125 '0x8335':130 '20':124 '2913':131 '402 payment api' 'access':112,156 'across':52 'actual':203 'advertis':155 'ai':10,27,62 'ai-inference' 'analysi':66 'analyt':56 'api':4,21,40,111,149,171 'base':7,24,101,126,133 'base usdc api' 'categori':54 'chain':142 'challeng':118 'classif':69 'classification' 'collect':45 'connect':180 'content':186 'convers':86 'data':9,26,55,59 'data-analytics' 'descript':197 'detail':216 'doc':170 'document':165 'embed':70 'embeddings' 'endpoint':14,31,51,89,105,202,212 'equal':135 'estim':80 'exact':146 'exampl':194 'exchang':75 'export':60 'extrem':167 'feed':74 'financ':11,28,71 'finance-data' 'format':222 'four':53 'gas':79 'gate':3,20,158 'generat':87 'geocod':84 'geocoding' 'header':164 'infrastructur':82 'input':218 'insight':61 'key':150 'land':208 'learn':64 'limit':153 'list':108,210 'live':116 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':63 'mani':211 'metric':57 'micropayment api' 'network':102 'offer':8,25 'on-chain':140 'openapi':190 'output':221 'page':175,209 'paid':96 'paramet':219 'pay':48 'pay per call api' 'pay-per-request':47 'payment':120,137,163 'per':49,94 'platform':5,22,41,206 'premium':110 'price':73,91,172 'prompt':182 'protocol':39 'provid':43,214 'pure':159 'quot':78 'rate':76,152 'readm':174 'render':177 'report':58 'request':50,95 'request/response':193 'requir':119 'return':114,204 'schema':191 'scheme':147 'sentiment':65 'sentiment-analysis' 'settl':139 'spars':168 'specif':104 'substant':185 'summar':68 'text':67 'text-summarization' 'token':77 'unit':127 'usdc':98,129 'usdc-base' 'util':13,30,83 'utility-apis' 'valid':85 'via':143 'wallet':181 'web3':72 'x402':2,19,38,117,145,162 'x402 api' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"ee0122fd-bf69-43f1-acb7-b18454a99a21","listingId":"164a2d24-560a-4ae8-a24a-346da773a402","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/cards/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:20.133Z"}],"sources":[{"listingId":"164a2d24-560a-4ae8-a24a-346da773a402","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/22","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:20.133Z","lastSeenAt":"2026-04-23T12:31:04.804Z"}],"details":{"listingId":"164a2d24-560a-4ae8-a24a-346da773a402","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/22 \\\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/cards/22 requires up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/22"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages all show only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key registration","Fetching real-time finance data like token quotes, gas estimates, and exchange rates on a per-request basis","Running utility operations like geocoding, validation, and data conversion with instant crypto-settled access"],"bestFor":["Agents or developers who want keyless, pay-per-call API access settled in USDC on Base","Quick one-off requests where subscription pricing is overkill","x402-native workflows that need low-cost utility or AI endpoints"],"notFor":["High-volume production workloads where $0.02/request adds up (no bulk discounts documented)","Users who need detailed API documentation, schemas, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.604Z"},"updatedAt":"2026-04-23T12:31:04.804Z"}}