{"id":"6a276b8f-103c-4e96-8d88-751e72095abd","shortId":"KAhL9R","kind":"x402","title":"Pay-per-request API platform on Base via x402 — $0.02/call, no API keys required.","tagline":"Pay-per-request API platform on Base via x402 — $0.02/call, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API marketplace offering a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Each endpoint costs $0.02 per request, paid in USDC on the Base network. The platform requires no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/products/20` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform also exposes endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. Documentation pages (docs, pricing, README) appear to require wallet connection and contain no substantive content in the crawl, so the exact request/response schemas for this endpoint are unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","data-analytics","ai-inference","finance-data","web3-data","utility-services"],"categories":["api-marketplace","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["Documentation, pricing, and README pages all require wallet connection and returned no useful content during crawl","No OpenAPI spec or request/response schema available for this endpoint","The exact purpose and output of /api/v1/products/20 ('Premium API Access') is unclear — it may be a generic product endpoint rather than a specific service","No information on uptime guarantees, rate limits, or error handling"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/20","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/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and confirms pricing and payment details. However, documentation pages are gated behind wallet connection and yield no content, so request/response schemas, detailed endpoint behavior, and the actual data returned by /api/v1/products/20 are entirely 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'/call':12,28 '0.02':11,27,58,125,173 '000':114 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':137 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':120 '20':113 '300':140 '6':129 'Base network API' 'USDC API' 'accept':103 'access':101 'across':46 'address':136 'advertis':109 'ai-inference' 'ai/ml':49 'also':146 'analysi':151 'analyt':48 'api':5,14,21,30,39,72,100 'appear':181 'asset':119 'attach':83 'base':8,24,66,115,122 'broader':144 'caller':81 'challeng':108 'classif':154 'commit':80 'connect':185 'contain':187 'content':190 'convers':166 'cost':57 'crawl':193 'data':47 'data-analytics' 'decim':130 'doc':178 'document':176 'embed':155 'enabl':38 'endpoint':45,56,93,148,201 'equal':124 'estim':163 'exact':196 'exchang':158 'expos':147 'feed':157 'finance-data' 'finance/web3':51 'gas':162 'generat':168 'geocod':164 'given':126 'header':87 'infer':50 'infrastructur':53 'key':15,31,73 'limit':76 'list':97 'lowpaymentfee' 'lowpaymentfee.com':33 'marketplac':40 'maxamountrequir':111 'micropayment API' 'network':67 'no-api-key' 'offer':41 'page':177 'paid':61 'pay':2,18 'pay-per-call API' 'pay-per-request':1,17 'payment':86,132 'per':3,19,59 'platform':6,22,69,145 'point':175 'post':104 'premium':99 'premium API access' 'price':156,174,179 'quot':161 'rate':75,159 'readm':180 'request':4,20,60,90,105 'request/response':197 'requir':16,32,70,183 'schema':198 'second':141 'sent':134 'sentiment':150 'simpli':82 'specif':92 'substant':189 'summar':153 'text':152 'timeout':142 'token':160 'unit':116 'unknown':203 'upfront':79 'usdc':63,118,127 'usdc-base' 'util':54 'utility-services' 'valid':165 'varieti':43 'via':9,25 'wallet':184 'web3-data' 'x402':10,26,37,85,107 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"fb7ddba3-fd5c-42eb-a8f9-ad2aa74b8461","listingId":"6a276b8f-103c-4e96-8d88-751e72095abd","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/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:43.286Z"}],"sources":[{"listingId":"6a276b8f-103c-4e96-8d88-751e72095abd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/20","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:43.286Z","lastSeenAt":"2026-04-23T15:00:45.732Z"}],"details":{"listingId":"6a276b8f-103c-4e96-8d88-751e72095abd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/20 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/20"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/20"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API access without managing API keys or subscriptions","Programmatic access to analytics, AI inference, or financial data with per-call USDC payments","Web3-native applications that want to pay for utility services (geocoding, validation, conversion) per request"],"bestFor":["Developers and agents who want zero-setup, pay-as-you-go API access","Use cases requiring low-cost ($0.02) individual API calls settled on Base","Projects already holding USDC on Base that need diverse utility endpoints"],"notFor":["High-volume workloads where per-call pricing at $0.02 adds up significantly","Users without USDC on Base or unfamiliar with x402 payment flows","Applications requiring detailed SLAs, guaranteed uptime, or rate-limit guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.996Z"},"updatedAt":"2026-04-23T15:00:45.732Z"}}