{"id":"14a8b4fb-e6d8-4a2e-8486-ca344adf0809","shortId":"4GkSC2","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and utility services. All endpoints are priced at $0.02 per request, settled in USDC on the Base network. The x402 protocol means there are no API keys, no accounts, and no rate limits — callers simply attach a payment header to each request.\n\nThe specific endpoint at `/api/v1/products/43` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the exact payment scheme. The endpoint accepts POST requests and returns `application/json`.\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 data generation — all at the same $0.02 price point. However, documentation beyond the landing page is extremely sparse (docs, pricing, and README pages all render only a \"Connect wallet\" prompt), so the actual functionality, request schemas, and response formats for this specific endpoint and others are not documented in any accessible way.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["general","api-marketplace"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No request or response schema documented — callers cannot know what to send or expect back","Documentation pages (/docs, /pricing, /README) are effectively empty","The specific purpose of /api/v1/products/43 ('Premium API Access') is not explained anywhere","No OpenAPI or machine-readable API specification available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/43","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/43","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 challenge with clear pricing. However, there is no documentation for request/response schemas, no OpenAPI spec, and the docs/pricing/README pages are all blank (just 'Connect wallet'). The purpose of this specific '/products/43' endpoint is unclear beyond the generic 'Premium API Access' 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'/request':13,32 '0.02':12,31,72,131,190 '000':126 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':146 '20':125 '402 payment api' '6':136 'accept':154 'access':116,234 'account':92 'across':58 'actual':216 'address':145 'advertis':163 'ai/ml':61 'analysi':167 'analyt':60 'api':5,17,24,36,45,89,115 'application/json':159 'attach':99 'base':8,27,80,127,139 'base network api' 'beyond':195 'broad':50 'broader':161 'call':4,23 'caller':97 'catalog':51 'challeng':121 'classif':170 'connect':211 'convers':182 'data':59,184 'decim':137 'doc':202 'document':194,231 'embed':171 'enabl':44 'endpoint':57,68,108,153,164,226 'estim':179 'exact':149 'exchang':174 'extrem':200 'feed':173 'finance/web3':63 'format':222 'function':217 'gas':178 'generat':185 'geocod':180 'header':102 'howev':193 'infer':62 'json-response' 'key':18,37,90 'land':197 'limit':96 'list':112 'low payment fee' 'lowpaymentfee.com':39 'mean':85 'micropayment api' 'network':9,28,81 'no-api-key' 'offer':48 'other':228 'page':198,206 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':101,141,150 'per':3,22,55,73 'platform':6,25,46,162 'point':192 'post':155 'post-method' 'premium':114 'price':70,172,191,203 'prompt':213 'protocol':84 'quot':177 'rate':95,175 'readm':205 'render':208 'request':56,74,105,122,156,218 'requir':19,38 'respons':221 'return':118,158 'schema':219 'scheme':151 'sent':143 'sentiment':166 'servic':66 'settl':75 'simpli':98 'sinc':133 'spars':201 'specif':107,225 'summar':169 'text':168 'token':176 'unit':128 'usd':132 'usdc':15,34,77,130,134 'usdc api' 'usdc-base-network' 'use':135,147 'util':65 'valid':181 'via':10,29 'wallet':212 'way':235 'x402':11,30,43,83,120 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"b2908cc4-3cf5-4273-a77b-15bd4df50090","listingId":"14a8b4fb-e6d8-4a2e-8486-ca344adf0809","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/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:06.662Z"}],"sources":[{"listingId":"14a8b4fb-e6d8-4a2e-8486-ca344adf0809","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/43","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:06.662Z","lastSeenAt":"2026-04-22T15:00:36.412Z"}],"details":{"listingId":"14a8b4fb-e6d8-4a2e-8486-ca344adf0809","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/43 \\\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 requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/products/43"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without pre-registration or API key management","Programmatic access to utility or data endpoints with per-call USDC micropayments","Testing x402 protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 payment protocol","AI agents needing keyless, pay-as-you-go API access","Low-volume consumers who want no subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume production workloads where per-call pricing is inefficient","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.701Z"},"updatedAt":"2026-04-22T15:00:36.412Z"}}