{"id":"41e3d433-e7fd-4d41-88bd-69ff962417c1","shortId":"pN8XFh","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/products/28` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform offers 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 priced at $0.02 per request.\n\nThis particular endpoint (`/api/v1/products/28`) does not appear in the site's publicly listed catalog, and its exact functionality is unclear — the description is simply \"Premium API Access\" with no further documentation. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content. Without an OpenAPI schema, request/response examples, or detailed documentation, the actual behavior of this endpoint remains unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-marketplace","crypto"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["Endpoint /api/v1/products/28 is not listed in the site's public API catalog — its actual functionality is undocumented","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content","No OpenAPI schema, request body format, or response format is available","The exact behavior behind 'Premium API Access' cannot be verified without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/28","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/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge), but there is no OpenAPI schema, no request/response examples, and no documentation beyond a generic title. The docs pages render only a wallet-connect prompt. The specific functionality of /api/v1/products/28 is entirely 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'/request':13,32 '0.02':12,31,86,161 '000':80 '20':79 'accept':54 'access':70,100,190 'across':120 'actual':222 'addit':210 'advertis':91 'ai':130 'analysi':134 'analyt':124 'api':5,17,24,36,46,69,93,189,199 'appear':170 'attach':103 'base':8,27,59,81 'base network api' 'behavior':223 'broader':116 'call':4,23,88 'caller':101 'catalog':177 'categori':122 'challeng':75 'classif':137 'connect':205 'content':211 'convers':154 'data':123,127 'descript':185 'detail':219 'doc':196 'document':194,220 'embed':138 'endpoint':63,119,157,166,226 'estim':148 'exact':180 'exampl':217 'exchang':143 'export':128 'feed':142 'financ':139 'four':121 'function':181 'gas':147 'generat':155 'geocod':152 'header':108 'i.e':85 'infrastructur':150 'insight':129 'instant':99 'json-response' 'key':18,37,94 'learn':132 'limit':97 'list':66,176 'low payment fee' 'lowpaymentfee.com':39 'machin':131 'metric':125 'micropayment api' 'network':9,28,60 'no-api-key' 'offer':118 'openapi':214 'page':200 'particular':165 'pay':2,21,43 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':42 'payment':56,107,113 'per':3,22,44,87,162 'platform':6,25,47,90,117 'post-method' 'premium':68,188 'premium api access' 'price':141,159,197 'prompt':207 'proof':114 'protocol':52 'public':175 'quot':146 'rate':96,144 'remain':227 'render':202 'report':126 'request':45,76,163 'request/response':216 'requir':19,38 'return':72 'schema':215 'sentiment':133 'simpli':102,187 'site':173 'specif':62 'summar':136 'text':135 'token':145 'unclear':183 'unit':82 'unknown':228 'usdc':15,34,55,84 'usdc api' 'usdc-base-network' 'use':49 'util':151 'valid':111,153 'via':10,29 'wallet':206 'web3':140 'without':212 'x':106 'x-payment':105 'x402':11,30,51,74,112 'x402 api' 'x402-payment'","prices":[{"id":"9ec44fad-42d1-4bea-8869-66b91016fbcb","listingId":"41e3d433-e7fd-4d41-88bd-69ff962417c1","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/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:32.299Z"}],"sources":[{"listingId":"41e3d433-e7fd-4d41-88bd-69ff962417c1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/28","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:32.299Z","lastSeenAt":"2026-04-23T20:01:32.063Z"}],"details":{"listingId":"41e3d433-e7fd-4d41-88bd-69ff962417c1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/28 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/28"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a pay-per-call API without needing to register or obtain API keys","Making micropayments for API access using USDC on the Base network","Programmatic agent-driven API consumption with x402 payment protocol"],"bestFor":["Developers who want keyless, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Anyone without USDC on Base or unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:00:52.922Z"},"updatedAt":"2026-04-23T20:01:32.063Z"}}