{"id":"2855cc6c-97ac-42d5-b9f1-b27c004d5a52","shortId":"dVhb9Q","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 marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/products/94` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no subscriptions required.\n\nThe broader platform advertises four categories of endpoints: 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 listed endpoints share the same $0.02/request pricing. However, the specific endpoint probed (`/api/v1/products/94`) does not clearly map to any of these named services — it may be a generic product-detail or catalog endpoint, or an internal reference. Documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the actual request/response schemas for this and other endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base usdc api","402 payment api","lowpaymentfee"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) are all empty — only showing 'Connect wallet'","No OpenAPI or schema available; request and response formats are unknown","The endpoint path /api/v1/products/94 does not match any of the named services on the landing page — its actual function is unclear","No examples or error documentation available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/94","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/94","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 pricing and payment details. However, documentation pages are all blank ('Connect wallet'), there is no OpenAPI spec, no request/response schema, and the specific purpose of /api/v1/products/94 is unclear. This is effectively a stub listing with only the 402 challenge and landing page to work 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'/request':17,34,164 '0.02':16,33,89,163 '000':83 '20':82 '402':77 '402 payment api' '6':93 'access':45,73 'actual':215 'advertis':119 'ai':10,27,131 'ai-inference' 'analysi':135 'analyt':125 'api':4,21,41,72,107 'base':7,24,61,84 'base usdc api' 'behind':51 'beyond':198 'broader':117 'call':96 'catalog':191 'categori':121 'challeng':78 'classif':138 'classification' 'clear':174 'connect':211 'convers':155 'data':9,26,124,128 'data-analytics' 'decim':94 'detail':189 'document':197 'embed':139 'embeddings' 'empti':204 'endpoint':14,31,50,65,123,159,169,192,222 'essenti':203 'estim':149 'exact':103 'exchang':144 'export':129 'feed':143 'financ':11,28,140 'finance-data' 'four':120 'gas':148 'gate':3,20,44 'generat':156 'generic':186 'geocod':153 'geocoding' 'given':90 'howev':166 'i.e':88 'infrastructur':151 'insight':130 'intern':195 'key':108 'land':200 'learn':133 'limit':111 'list':69,158 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':132 'made':99 'map':175 'marketplac':42 'may':183 'metric':126 'micropay':55 'micropayment api' 'name':180 'network':62 'offer':8,25 'page':201,208 'pay-per-request api' 'payment':97 'per':53,95 'per-request':52 'per-request-micropayment' 'platform':5,22,118 'premium':71 'price':142,165 'probe':170 'product':188 'product-detail':187 'protocol':40 'quot':147 'rate':110,145 'refer':196 'report':127 'request':54,79 'request/response':216 'requir':115 'return':75 'schema':217 'scheme':104 'sentiment':134 'sentiment-analysis' 'servic':181 'settl':56 'share':160 'show':210 'specif':64,168 'sub':207 'sub-pag':206 'subscript':114 'summar':137 'text':136 'text-summarization' 'token':146 'unit':85 'unknown':224 'usdc':58,87,91 'usdc-base' 'util':13,30,152 'utility-services' 'valid':154 'varieti':48 'via':100 'wallet':212 'web3':141 'x402':2,19,39,102 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"b9cb5b42-e0e8-43c0-966b-51f2a77ba3ac","listingId":"2855cc6c-97ac-42d5-b9f1-b27c004d5a52","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/94","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:07.648Z"}],"sources":[{"listingId":"2855cc6c-97ac-42d5-b9f1-b27c004d5a52","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/94","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:07.648Z","lastSeenAt":"2026-04-23T16:30:38.740Z"}],"details":{"listingId":"2855cc6c-97ac-42d5-b9f1-b27c004d5a52","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/94 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/94"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/94"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Four endpoint categories: Data & Analytics, AI & Machine Learning, Finance & Web3, 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 payment","Geocoding or data validation as a utility service paid per request","Exporting analytics data or generating reports without a subscription"],"bestFor":["AI agents needing keyless, pay-per-call access to diverse utility endpoints","Developers prototyping with low-cost micropayment APIs on Base","Web3-native applications that prefer on-chain settlement over traditional billing"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SDKs, or guaranteed SLAs","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.776Z"},"updatedAt":"2026-04-23T16:30:38.740Z"}}