{"id":"b7f367e0-ad0c-44c7-81ed-6c6a5998a955","shortId":"tSweF7","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API marketplace that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure categories. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at `/api/v1/products/81` is listed as \"Premium API Access\" and returns an x402 challenge requesting payment of up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per call, consistent with the site's advertised pricing. Payment is made via the x402 exact scheme to the payTo address, with a 300-second timeout.\n\nThe platform advertises multiple API categories including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export. However, the specific functionality behind the `/api/v1/products/81` \"Premium API Access\" endpoint is not documented — no request/response schema, no examples, and no detailed docs are available. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["No documentation available — docs, pricing, and API pages all render only 'Connect wallet' with no content","The specific functionality of /api/v1/products/81 ('Premium API Access') is completely undocumented","No request or response schema provided; callers cannot know what to send or what to expect","No OpenAPI spec, no ai-plugin manifest, no agents.txt found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/81","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation for what this specific endpoint does, no request/response schema, no examples, and the docs pages are empty. The 'Premium API Access' label is generic and 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'/request':13,28 '0.02':12,27,61,121 '000':104 '0x8335':109 '20':103 '2913':110 '300':145 '6':116 'Base network API' 'USDC micropayment API' 'access':92,180 'across':45 'addit':211 'address':142 'advertis':129,150 'ai':48 'analysi':156 'analyt':47 'api':5,20,37,73,91,152,179,200 'avail':195 'base':8,23,69,105,112 'behind':175 'call':4,19,123 'categori':55,153 'challeng':97 'classif':159 'commit':80 'connect':206 'consist':124 'content':212 'convers':167 'crypto-paid API' 'data':46,169 'decim':117 'detail':192 'doc':193,197 'document':184 'embed':160 'enabl':36 'endpoint':44,57,84,181 'exact':137 'exampl':189 'exchang':163 'export':170 'feed':162 'financ':51 'function':174 'geocod':165 'howev':171 'http-post' 'includ':154 'infrastructur':54 'json-response' 'key':74 'learn':50 'limit':77 'list':88 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':49 'made':133 'marketplac':38 'multipl':151 'network':9,24,70 'no-api-key' 'offer':40 'page':201 'paid':64 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':99,131 'payto':141 'per':3,18,62,122 'platform':6,21,149 'premium':90,178 'price':59,130,161,198 'prompt':208 'rate':76,164 'render':203 'request':63,98 'request/response':186 'requir':81 'return':94 'schema':187 'scheme':138 'second':146 'sentiment':155 'sinc':113 'site':127 'specif':83,173 'summar':158 'text':157 'timeout':147 'translat':119 'unit':106 'usdc':15,30,66,108,114 'usdc-base-network' 'use':115 'valid':166 'varieti':42 'via':10,25,134 'wallet':207 'web3':52 'x402':11,26,35,96,136 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"49c4d416-60d0-4d47-94e0-05264f7419d6","listingId":"b7f367e0-ad0c-44c7-81ed-6c6a5998a955","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:43.681Z"}],"sources":[{"listingId":"b7f367e0-ad0c-44c7-81ed-6c6a5998a955","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:43.681Z","lastSeenAt":"2026-04-23T19:00:36.167Z"}],"details":{"listingId":"b7f367e0-ad0c-44c7-81ed-6c6a5998a955","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/81 \\\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, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/products/81"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without traditional API key registration","Making one-off API calls paid per request in USDC on Base","Agent-driven workflows that need frictionless pay-as-you-go API access"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on Base who want instant API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who need bulk pricing or subscription discounts","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T09:30:17.102Z"},"updatedAt":"2026-04-23T19:00:36.167Z"}}