{"id":"9425beaf-fee6-4084-ab07-ed678c7d1f2e","shortId":"6bBhxw","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is an x402-enabled API marketplace that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/products/52` is listed as \"Premium API Access\" and returns `application/json` via POST. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which has 6 decimals), equating to $0.02 per call. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises 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 exist but appear to require a wallet connection to view, so detailed request/response schemas are not publicly available. The endpoint is confirmed live (402 challenge captured successfully).","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","json-api","no-api-key","no-rate-limit"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api","402 payment api"],"warnings":["No OpenAPI or request/response schema available — input format for this endpoint is unknown","Documentation pages require wallet connection and contain no visible content","The specific purpose of /api/v1/products/52 ('Premium API Access') is not described anywhere — it may be a generic or placeholder endpoint","Cannot verify what data or service this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/52","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/52","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 the x402 challenge is well-formed with clear pricing. However, there is no OpenAPI spec, no request/response schema documentation, and the docs pages all just show 'Connect wallet' with no actual content. The purpose of this specific '/api/v1/products/52' endpoint is unclear beyond the generic label 'Premium API 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'/call':13,28 '0.02':12,27,62,127,171 '000':114 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':136 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':120 '20':113 '300':139 '402':199 '402 payment api' '6':123 'access':100 'account':74 'across':45 'address':135 'advertis':109,145 'ai/ml':48 'analysi':149 'analyt':47 'api':5,20,37,72,99 'appear':178 'application/json':103 'asset':119 'attach':82 'avail':193 'base':8,23,69,115 'base network api' 'broader':143 'call':129 'caller':80 'captur':201 'challeng':108,200 'classif':152 'confirm':197 'connect':183 'convers':164 'data':46 'decim':124 'detail':187 'document':174 'embed':153 'enabl':36 'endpoint':44,55,92,146,195 'equat':125 'estim':161 'exchang':156 'exist':176 'feed':155 'finance/web3':50 'gas':160 'generat':166 'geocod':162 'header':86 'infer':49 'infrastructur':52 'json-api' 'key':73 'limit':77 'list':96 'live':198 'low payment fee' 'lowpaymentfee.com':31 'marketplac':38 'maxamountrequir':111 'micropayment api' 'network':9,24,70 'no-api-key' 'no-rate-limit' 'offer':40 'page':175 'pay':2,17,58 'pay per call api' 'pay-per-request':1,16,57 'payment':85,131 'per':3,18,59,128 'platform':6,21,144 'point':173 'post':105 'premium':98 'price':154,172 'public':192 'quot':159 'rate':76,157 'request':4,19,60,89 'request/response':188 'requir':79,180 'return':102 'schema':189 'second':140 'sent':133 'sentiment':148 'settl':64 'simpli':81 'specif':91 'success':202 'summar':151 'text':150 'timeout':141 'token':158 'unit':116 'usdc':15,30,66,118 'usdc api' 'usdc-base' 'util':53 'valid':163 'varieti':42 'via':10,25,104 'view':185 'wallet':182 'x402':11,26,35,84,107 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"1872f69a-075a-416c-ab64-65c613ee5507","listingId":"9425beaf-fee6-4084-ab07-ed678c7d1f2e","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/52","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:39.089Z"}],"sources":[{"listingId":"9425beaf-fee6-4084-ab07-ed678c7d1f2e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/52","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:39.089Z","lastSeenAt":"2026-04-23T12:05:08.046Z"}],"details":{"listingId":"9425beaf-fee6-4084-ab07-ed678c7d1f2e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/52 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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) equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/products/52"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Programmatic access to data, AI, finance, or utility endpoints with per-call USDC micropayments","Testing x402 payment protocol integrations on Base network"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers exploring pay-per-request API models without subscriptions","Low-volume or bursty workloads where flat-rate pricing is wasteful"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users who need detailed API documentation or OpenAPI specs before integrating","Callers without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.385Z"},"updatedAt":"2026-04-23T12:05:08.046Z"}}