{"id":"83082199-38c2-43d8-83f6-3b66fd791379","shortId":"k3CGF8","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the platform, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints on the platform are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/payments/306` is labeled \"Premium API Access\" but the crawled material does not clarify what data or functionality this particular route returns — it is not listed among the documented API categories on the homepage. The x402 challenge confirms the endpoint is live, accepts POST requests, requires payment of up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, and returns `application/json`.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point. Documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no further technical detail, so request/response schemas for this or any other endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","micropayment API","USDC pay-per-call","Base network API"],"warnings":["The specific functionality of /api/v1/payments/306 is undocumented — it does not appear in the homepage's listed API categories.","All documentation, pricing, and README pages return only 'Connect wallet' with no technical content.","No request or response schema is available; callers cannot know what to send or expect back.","This endpoint may be a generic placeholder or test route."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/306","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/306","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 for this specific route's purpose, no request/response schema, and docs pages are empty. The 'Premium API Access' label is generic and 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'/request':13,28 '0.02':12,27,76,154,194 '000':148 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':162 '20':147 '6':158 'Base network API' 'USDC pay-per-call' 'accept':139 'access':7,22,38,103 'address':161 'advertis':171 'ai':60 'among':123 'analysi':175 'analyt':59 'api':6,21,37,88,102,126 'application/json':167 'base':9,24,84,149,164 'beyond':199 'broader':169 'call':4,19 'categori':56,127 'challeng':133 'clarifi':110 'classif':178 'commit':93 'confirm':134 'connect':206 'convers':186 'crawl':106 'data':58,112,188 'decim':159 'detail':213 'document':125,197 'embed':179 'endpoint':32,49,69,97,136,172,222 'exchang':182 'export':189 'feed':181 'financ':63 'function':114 'geocod':184 'given':155 'homepag':130 'i.e':153 'includ':57 'infrastructur':66 'json-response' 'key':89 'label':100 'land':201 'learn':62 'limit':91 'list':122 'live':138 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':61 'mani':48 'materi':107 'micropayment API' 'network':85 'no-api-key' 'offer':50 'one':46 'page':198,202 'particular':116 'pay':2,17 'pay-per-cal':1,16 'pay-per-request' 'payabl':79 'payment':42,143 'per':3,18,77 'platform':53,72,170 'point':196 'post':140 'post-method' 'premium':5,20,36,101 'price':74,180,195 'prompt':208 'protocol':43 'provid':35 'rate':90,183 'request':78,141 'request/response':215 'requir':94,142 'return':118,166,203 'rout':117 'schema':216 'sentiment':174 'span':55 'specif':96 'summar':177 'technic':212 'text':176 'unit':150 'unknown':224 'usdc':15,30,81,152,156 'usdc-base' 'util':67 'valid':185 'via':10,25,39 'wallet':207 'web3':64 'x402':11,26,41,132 'x402 premium API' 'x402-payment'","prices":[{"id":"e814c4be-ad0e-4187-b3a7-35e21f23dc80","listingId":"83082199-38c2-43d8-83f6-3b66fd791379","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/306","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:14.424Z"}],"sources":[{"listingId":"83082199-38c2-43d8-83f6-3b66fd791379","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/306","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:14.424Z","lastSeenAt":"2026-04-23T12:31:28.099Z"}],"details":{"listingId":"83082199-38c2-43d8-83f6-3b66fd791379","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/306 \\\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":"All endpoints priced at $0.02/request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired 20000 in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/306"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment flows","Agents that need keyless, pay-as-you-go API access","Low-volume consumers who want no subscription or rate-limit overhead"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume consumers seeking bulk pricing or subscription discounts","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.64Z"},"updatedAt":"2026-04-23T12:31:28.099Z"}}