{"id":"dc7d74da-0ea2-43f7-bb8c-34d66a19f849","shortId":"8ewqAN","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 broad catalog 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 and settle in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/carts/100` is listed as \"Premium API Access\" and carries an x402 challenge requesting up to 20,000 units of USDC (0x8335…2913 on Base) per call, which at 6-decimal USDC precision equals $0.02. Payment is made via the `exact` scheme with no API keys or rate limits required — callers simply attach an X-PAYMENT header to a POST request. The 402 challenge was confirmed live during probing.\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 crawled material. The actual behavior of the `/api/v1/carts/100` endpoint (what it returns after payment) cannot be determined from the available information.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","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 request api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["Documentation pages (docs, pricing, API, README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema documentation available for any endpoint","The specific endpoint /api/v1/carts/100 purpose is undocumented — 'carts' does not match any of the listed API categories","Cannot verify what data or functionality is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/100","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/100","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 documentation is essentially nonexistent — all doc/pricing/API pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schemas, and no examples. The purpose of the specific /api/v1/carts/100 endpoint is unclear beyond its generic 'Premium API Access' 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'/request':17,34 '0.02':16,33,91,143 '000':126 '0x8335':130 '20':125 '2913':131 '402':172 '402 payment api' '6':138 'access':116 'across':50 'actual':220 'ai':10,27,60 'ai-inference' 'analysi':64 'analyt':54 'api':4,21,41,115,153,185 'attach':161 'avail':214,236 'base':7,24,100,133 'base network api' 'base-network' 'behavior':221 'broad':46 'call':135 'caller':159 'cannot':231 'carri':118 'catalog':47 'categori':52 'challeng':121,173 'classif':67 'classification' 'confirm':175 'connect':194 'content':200 'convers':84 'crawl':217 'data':9,26,53,57 'data-analytics' 'decim':139 'determin':233 'doc':184 'document':179,209 'embed':68 'embeddings' 'enabl':40 'endpoint':14,31,49,87,108,225 'equal':142 'estim':78 'exact':149 'exampl':213 'exchang':73 'export':58 'expos':44 'extrem':181 'feed':72 'financ':11,28,69 'finance-data' 'four':51 'gas':77 'generat':85 'geocod':82 'geocoding' 'header':166 'inform':237 'infrastructur':80 'insight':59 'key':154 'learn':62 'limit':157 'list':112 'live':176 'low payment fee' 'lowpaymentfee.com':35 'machin':61 'made':146 'materi':218 'metric':55 'micropayment api' 'network':101 'no-api-key' 'offer':8,25 'openapi':204 'page':189 'pay per request api' 'pay-per-request' 'payabl':3,20 'payment':144,165,230 'per':92,134 'platform':5,22,42 'post':169 'precis':141 'premium':114 'price':71,89,186 'probe':178 'prompt':196 'protocol':105 'quot':76 'rate':74,156 'readm':188 'render':191 'report':56 'request':93,122,170 'request/response':207 'requir':158 'return':228 'schema':208 'scheme':150 'sentiment':63 'sentiment-analysis' 'settl':95 'simpli':160 'spec':205 'specif':107 'summar':66 'text':65 'text-summarization' 'thin':182 'token':75 'unit':127 'usag':212 'usdc':97,129,140 'usdc api' 'usdc-settlement' 'util':13,30,81 'utility-apis' 'valid':83 'via':102,147 'wallet':195 'web3':70 'x':164 'x-payment':163 'x402':2,19,39,104,120 'x402 api' 'x402-enabled':38 'x402-payable':1,18 'x402-payment'","prices":[{"id":"927405c5-a24c-4362-a8f9-9722452c223e","listingId":"dc7d74da-0ea2-43f7-bb8c-34d66a19f849","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/100","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:11.097Z"}],"sources":[{"listingId":"dc7d74da-0ea2-43f7-bb8c-34d66a19f849","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/100","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:11.097Z","lastSeenAt":"2026-04-23T20:01:20.829Z"}],"details":{"listingId":"dc7d74da-0ea2-43f7-bb8c-34d66a19f849","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/100 \\\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 per request with no minimums or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Payment settles in USDC on Base network, no API keys or rate limits required","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge is live with maxAmountRequired of 20000 (USDC 6-decimal = $0.02) using exact scheme","source_url":"https://lowpaymentfee.com/api/v1/carts/100"},{"claim":"API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time financial data like token quotes, exchange rates, and gas estimates via micropayment","Running geocoding or data validation calls on a per-request payment basis","Exporting data or generating analytics reports with no subscription commitment"],"bestFor":["Agents or developers who want instant API access without registration or API keys","Low-volume or sporadic API consumers who prefer pay-per-call over subscriptions","x402-compatible agents settling payments in USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T10:02:51.475Z"},"updatedAt":"2026-04-23T20:01:20.829Z"}}