{"id":"7520fbec-eaa7-4896-8b97-2b7cac1459d9","shortId":"CBEcuk","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-enabled API marketplace that exposes a broad set 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 pay-per-call at $0.02 each, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/products/92` 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 instant once payment is included in the X-PAYMENT header.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, 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 nature of what `/api/v1/products/92` actually returns is unclear from the available information; the endpoint name \"Premium API Access\" is generic and could be a product catalog entry or a meta-endpoint. Prospective users should test the endpoint to determine its actual output.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","cheap api","402 payment api"],"warnings":["No OpenAPI or schema documentation available — all /docs, /pricing, /api, /README pages return only 'Connect wallet' with no content","The specific purpose and response format of /api/v1/products/92 ('Premium API Access') is unclear; it may be a generic product catalog entry","No request body schema or response examples are documented anywhere in the crawled material","Cannot verify that the advertised AI/finance/utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/92","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/products/92","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the purpose of /api/v1/products/92 specifically is ambiguous. Effectively a stub 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'/api/v1/products/92':111,222 '/docs':183 '/pricing':184 '/readme':187 '/request':17,34 '0.02':16,33,94,138 '000':127 '0x8335':132 '20':126 '2913':133 '300':154 '402':121 '402 payment api' '6':142 'access':117,165,236 'across':50 'actual':223,260 'advertis':164 'ai':10,27,60 'ai-inference' 'analysi':64 'analyt':54 'api':4,21,41,116,158,235 'avail':213,229 'base':7,24,101,128,135 'base network api' 'base-network' 'broad':46 'call':92 'catalog':244 'categori':52 'challeng':122 'cheap api' 'classif':67 'connect':193 'content':199 'convers':84 'could':240 'crawl':216 'data':9,26,53,57 'data-analytics' 'decim':143 'determin':258 'document':178,208 'embed':68 'embeddings' 'enabl':40 'endpoint':14,31,49,87,109,232,250,256 'entri':245 'equal':137 'estim':78 'exact':150 'exampl':212 'exchang':73 'export':58 'expos':44 'extrem':180 'feed':72 'financ':11,28,69 'finance-data' 'four':51 'gas':77 'gate':3,20 'generat':85 'generic':238 'geocod':82 'geocoding' 'given':139 'header':177 'includ':171 'inform':230 'infrastructur':80 'insight':59 'instant':167 'key':159 'learn':62 'limit':162 'list':113 'low payment fee' 'lowpaymentfee.com':35 'machin':61 'made':146 'marketplac':42 'materi':217 'meta':249 'meta-endpoint':248 'metric':55 'micropayment api' 'name':233 'natur':219 'network':102 'no-api-key' 'offer':8,25 'openapi':203 'output':261 'page':188 'pay':90 'pay per call api' 'pay-per-cal':89 'pay-per-request' 'payment':144,169,176 'per':91 'platform':5,22 'premium':115,234 'price':71 'product':243 'prompt':195 'prospect':251 'protocol':106 'quot':76 'rate':74,161 'render':190 'report':56 'request':123 'request/response':206 'return':119,224 'schema':207 'scheme':151 'second':155 'sentiment':63 'sentiment-analysis' 'set':47 'settl':96 'spars':181 'spec':204 'specif':108 'summar':66 'test':254 'text':65 'text-summarization' 'timeout':156 'token':75 'unclear':226 'unit':129 'usag':211 'usdc':98,131,140 'usdc api' 'usdc-settlement' 'user':252 'util':13,30,81 'utility-apis' 'valid':83 'via':103,147 'wallet':194 'web3':70 'x':175 'x-payment':174 'x402':2,19,39,105,149 'x402 api' 'x402-enabled':38 'x402-gated':1,18 'x402-payment'","prices":[{"id":"5716197a-43ff-433e-bc54-ccbd9c684c9a","listingId":"7520fbec-eaa7-4896-8b97-2b7cac1459d9","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/products/92","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:02.844Z"}],"sources":[{"listingId":"7520fbec-eaa7-4896-8b97-2b7cac1459d9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/92","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:02.844Z","lastSeenAt":"2026-04-23T16:30:38.505Z"}],"details":{"listingId":"7520fbec-eaa7-4896-8b97-2b7cac1459d9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/92 \\\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 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/products/92"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto gas estimates or token quotes with per-call micropayments","Geocoding or data validation as a utility service paid in USDC on Base","Exporting analytics data or generating reports via pay-as-you-go endpoints"],"bestFor":["Developers and agents wanting zero-commitment, keyless API access","Crypto-native applications that can settle payments in USDC on Base","Low-volume or bursty workloads where per-request pricing is cost-effective"],"notFor":["High-volume production workloads needing SLAs, rate guarantees, or detailed documentation","Users who cannot transact in USDC on the Base network","Applications requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.997Z"},"updatedAt":"2026-04-23T16:30:38.505Z"}}