{"id":"515dca7e-c6f4-47a2-899a-1766b4c38e59","shortId":"6ggSjg","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is a multi-category API platform that gates access via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/products/83` is listed as \"Premium API Access\" and accepts USDC payments on Base. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the site's uniform $0.02/request pricing across all endpoints.\n\nThe 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 follow the same x402 payment model with no API keys, no rate limits, and no minimum commitments required.\n\nThe `/api/v1/products/83` endpoint itself is live and returns a proper 402 challenge on POST. However, the crawled documentation pages (docs, api, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas for this specific endpoint are unknown. It is unclear what data or functionality \"Premium API Access\" provides compared to the other named endpoints on the platform.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","no-rate-limit","json-response","post-method"],"categories":["api-marketplace","data"],"synonyms":["low payment fee","x402 api","pay-per-call api","micropayment api","base network api","usdc api access","premium api"],"warnings":["No documentation available — all doc pages return only 'Connect wallet' with no content","The specific functionality of /api/v1/products/83 ('Premium API Access') is undefined; it does not correspond to any of the named endpoints listed on the homepage","No request or response schema is available; callers cannot know what to send or expect back","The platform lists many endpoint categories but provides no evidence any of them return real data"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/83","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/83","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, no request/response schema, and no indication of what 'Premium API Access' actually returns. The docs, pricing, and README pages are all empty beyond a wallet-connect 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'/request':16,32,96 '0.02':15,31,86,95 '000':77 '20':76 '402':170 '6':82 'accept':64 'access':43,62,214 'across':98,105 'actual':196 'advertis':72 'ai':9,25,115 'analysi':119 'analyt':8,24,109 'api':4,20,39,61,150,180,213 'base':7,23,51,68,78 'base network api' 'categori':38,107 'challeng':71,171 'classif':122 'commit':158 'compar':216 'connect':187 'consist':89 'content':193 'convers':138 'crawl':176 'data':108,112,209 'decim':83 'doc':179 'document':177 'embed':123 'endpoint':13,29,55,100,104,141,162,202,221 'equal':85 'estim':133 'exchang':128 'export':113 'feed':127 'financ':10,26,124 'follow':142 'four':106 'function':211 'gas':132 'gate':3,19,42 'generat':139 'geocod':136 'howev':174 'infrastructure/utilities':135 'insight':114 'json-response' 'key':151 'learn':117 'limit':154 'list':58 'live':165 'low payment fee' 'lowpaymentfee.com':33 'machin':116 'maxamountrequir':74 'metric':110 'micropayment api' 'minimum':157 'model':147 'multi':37 'multi-categori':36 'name':220 'network':52 'no-api-key' 'no-rate-limit' 'offer':103 'page':178 'pay-per-call api' 'pay-per-request' 'payment':47,66,146 'per':87 'platform':40,102,224 'post':173 'post-method' 'premium':60,212 'premium api' 'price':97,126,181 'prompt':189 'proper':169 'protocol':48 'provid':215 'quot':131 'rate':129,153 'readm':182 'report':111 'request':88 'request/response':197 'requir':159 'return':167,184 'schema':198 'sentiment':118 'site':92 'specif':54,201 'substant':192 'suit':5,21 'summar':121 'text':120 'token':130 'unclear':207 'uniform':94 'unit':79 'unknown':204 'usdc':65,81 'usdc api access' 'usdc-base' 'util':12,28 'valid':137 'via':44 'wallet':188 'web3':125 'x402':2,18,46,70,145 'x402 api' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"f1f6c4f4-6a52-423b-864d-e6ebd0c4fe9b","listingId":"515dca7e-c6f4-47a2-899a-1766b4c38e59","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/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:05.912Z"}],"sources":[{"listingId":"515dca7e-c6f4-47a2-899a-1766b4c38e59","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/83","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:05.912Z","lastSeenAt":"2026-04-23T13:30:31.800Z"}],"details":{"listingId":"515dca7e-c6f4-47a2-899a-1766b4c38e59","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/83 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/83"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/83"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a suite of data, AI, finance, and utility APIs without needing API keys or subscriptions","Agent-driven workflows that pay per request using USDC on Base via x402","Low-cost one-off API calls where traditional subscription pricing is undesirable"],"bestFor":["Developers or agents wanting zero-commitment, pay-per-use API access","x402-compatible agents that can settle USDC on Base","Use cases requiring small, infrequent API calls without subscription overhead"],"notFor":["High-volume production workloads where per-request pricing adds up quickly","Users who need detailed API documentation and guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.873Z"},"updatedAt":"2026-04-23T13:30:31.800Z"}}