{"id":"11e1efdd-fac3-4489-9ae0-fdc8a1c00aa9","shortId":"5gYd3z","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/payments/305` is labeled \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requiring up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). No API keys, rate limits, or subscriptions are required — each request is paid individually via the X-PAYMENT header.\n\nThe broader platform advertises multiple API categories including 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 listed at $0.02 per request. However, the specific endpoint `/api/v1/payments/305` does not clearly map to any of these named services — it sits under a `/payments/` path and is generically described as \"Premium API Access\" with no further documentation on what data or functionality it returns.\n\nDocumentation is extremely thin. The /docs, /pricing, /api, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no examples of what this endpoint actually returns. Prospective callers should be aware that the actual behavior of this specific endpoint is undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all return only a 'Connect wallet' prompt","No OpenAPI or schema describing request parameters or response format for this endpoint","The endpoint path /api/v1/payments/305 does not correspond to any of the named services listed on the homepage","Actual functionality of this specific endpoint is unknown — 'Premium API Access' is not descriptive"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/305","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/payments/305","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what this specific endpoint actually does. The generic label 'Premium API Access' and the /payments/305 path provide no functional 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'/api/v1/payments/305':57,169 '/docs':210 '/payments':184 '/pricing':211 '/readme':214 '/request':13,28 '0.02':12,27,89,162 '000':78 '0x8335':83 '20':77 '2913':84 '6':94 'Base network API' 'USDC micropayment API' 'accept':46,64 'access':62,193 'actual':242,251 'advertis':119 'ai':131 'analysi':135 'analyt':125 'api':5,20,38,61,97,121,192 'awar':248 'base':8,23,51,79,86 'behavior':252 'broader':117 'call':4,19,91 'caller':245 'categori':122 'challeng':69 'classif':138 'clear':172 'confirm':70 'connect':220 'content':226 'convers':155 'crypto-paid API' 'data':124,128,200 'decim':95 'describ':189 'document':197,205 'embed':139 'endpoint':55,158,168,241,256 'equal':88 'estim':149 'exampl':237 'exchang':144 'export':129 'extrem':207 'feed':143 'financ':140 'function':202 'gas':148 'generat':156 'generic':188 'geocod':153 'header':115 'howev':165 'includ':123 'individu':109 'infrastructur':151 'insight':130 'key':98 'label':59 'learn':133 'limit':100 'list':160 'live':73 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':132 'map':173 'metric':126 'multipl':120 'name':178 'network':9,24,52 'no-api-key' 'openapi':230 'page':215 'paid':108 'path':185 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,114 'per':3,18,36,90,163 'platform':6,21,39,118 'post':65 'post-endpoint' 'premium':60,191 'premium API access' 'price':142 'prompt':222 'prospect':244 'protocol':44 'quot':147 'rate':99,145 'report':127 'request':37,66,106,164 'request/response':233 'requir':74,104 'return':204,217,243 'schema':234 'sentiment':134 'servic':179 'sit':181 'spec':231 'specif':54,167,255 'subscript':102 'substant':225 'summar':137 'text':136 'thin':208 'token':146 'undocu':258 'unit':80 'usdc':15,30,47,82,92 'usdc-base' 'use':41,93 'util':152 'valid':154 'via':10,25,110 'wallet':221 'web3':141 'x':113 'x-payment':112 'x402':11,26,43,68 'x402 API' 'x402-payment'","prices":[{"id":"b9ca211c-0aab-449f-ac59-0b234cde504c","listingId":"11e1efdd-fac3-4489-9ae0-fdc8a1c00aa9","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/payments/305","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:13.794Z"}],"sources":[{"listingId":"11e1efdd-fac3-4489-9ae0-fdc8a1c00aa9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/305","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:13.794Z","lastSeenAt":"2026-04-24T01:32:20.814Z"}],"details":{"listingId":"11e1efdd-fac3-4489-9ae0-fdc8a1c00aa9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/305 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/305"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-request API without needing API keys or subscriptions","Agent-driven workflows that settle per-call costs in USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","Agents needing keyless, pay-as-you-go API access on Base","Low-volume callers who want to avoid subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume production workloads where $0.02/request adds up without bulk discounts","Anyone who needs to know exactly what this endpoint returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.733Z"},"updatedAt":"2026-04-24T01:32:20.814Z"}}