{"id":"14521bd1-8ac6-4650-8656-a92953606411","shortId":"gwapvT","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated premium API endpoint on Base, pay-per-request with USDC.","description":"This endpoint at lowpaymentfee.com is one of many x402-protocol-gated API resources offered by the provider. The specific resource `/api/v1/generate/resource/28` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) via the x402 exact payment scheme. The maximum amount required per call is 20,000 USDC base units, which at 6 decimals equals $0.02 per request.\n\nThe provider's landing page advertises a broad catalog of endpoints spanning data & analytics, AI & machine learning (sentiment analysis, 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 with no API keys, no rate limits, and no minimum commitments.\n\nHowever, the specific functionality behind `/api/v1/generate/resource/28` is not documented. The endpoint title \"Premium API Access\" is generic and the crawled docs pages returned only a wallet-connect prompt with no further technical documentation, request/response schemas, or usage examples. Without knowing what this particular resource generates or returns, callers should treat this as an opaque paid endpoint until more documentation becomes available.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","post-endpoint","json-response"],"categories":["api","infrastructure"],"synonyms":["lowpaymentfee","x402 api","paid api","usdc api","base network api","micropayment api","premium api"],"warnings":["The specific functionality of /api/v1/generate/resource/28 is unknown — 'Premium API Access' is a generic label with no documentation.","All documentation pages (docs, api, pricing, README) returned only a wallet-connect prompt with no usable content.","No request or response schema is available; callers cannot know what to send or what to expect.","The provider site lists many endpoints but none appear individually documented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/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/generate/resource/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it is operational. However, the specific resource's purpose is entirely undocumented — no request schema, no response schema, no examples, and the docs/pricing/README pages all returned only a wallet-connect stub. The listing title 'Premium API Access' is generic and 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'0.02':95,142 '000':86 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':71 '20':85 '6':92 'accept':58 'access':56,170 'advertis':103 'ai':112 'amount':80 'analysi':116 'analyt':111 'api':5,19,41,55,147,169 'avail':217 'base':8,22,66,88 'base network api' 'base-network' 'becom':216 'behind':160 'broad':105 'call':83 'caller':204 'catalog':106 'classif':118 'commit':155 'connect':183 'contract':70 'convers':135 'crawl':175 'data':110 'decim':93 'doc':176 'document':164,189,215 'embed':119 'endpoint':6,20,30,108,138,166,212 'equal':94 'estim':129 'exact':75 'exampl':194 'exchang':124 'feed':123 'financ':120 'function':159 'gas':128 'gate':3,17,40 'generat':136,201 'generic':172 'geocod':133 'howev':156 'infrastructur':131 'json-response' 'key':148 'know':196 'land':101 'learn':114 'limit':151 'list':52 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':113 'mani':36 'maximum':79 'micropayment api' 'minimum':154 'network':67 'offer':43 'one':34 'opaqu':210 'page':102,177 'paid':211 'paid api' 'particular':199 'pay':10,24 'pay-per-request':9,23 'payment':61,76 'per':11,25,82,96,143 'post':59 'post-endpoint' 'premium':4,18,54,168 'premium api' 'price':122,140 'prompt':184 'protocol':39 'provid':46,99 'quot':127 'rate':125,150 'request':12,26,60,97,144 'request/response':190 'requir':81 'resourc':42,49,200 'return':178,203 'schema':191 'scheme':77 'sentiment':115 'settl':63 'span':109 'specif':48,158 'summar':117 'technic':188 'titl':167 'token':126 'treat':206 'unit':89 'usag':193 'usdc':14,28,69,87 'usdc api' 'usdc-payment' 'use':68 'util':132 'valid':134 'via':72 'wallet':182 'wallet-connect':181 'web3':121 'without':195 'x402':2,16,38,74 'x402 api' 'x402-gated':1,15 'x402-payment' 'x402-protocol-gated':37","prices":[{"id":"4b748941-29a5-4fb2-bd10-68906ce911d6","listingId":"14521bd1-8ac6-4650-8656-a92953606411","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/generate/resource/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":"2026-04-18T18:32:06.927Z"}],"sources":[{"listingId":"14521bd1-8ac6-4650-8656-a92953606411","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/28","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:06.927Z","lastSeenAt":"2026-04-23T03:47:42.829Z"}],"details":{"listingId":"14521bd1-8ac6-4650-8656-a92953606411","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/28 \\\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":"Endpoint returns HTTP 402 with x402 version 1 challenge requiring USDC payment on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/28"},{"claim":"Max amount required is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equating to $0.02","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/28"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Provider lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API resource without API key registration","Agent-driven workflows that need on-demand paid endpoint access via x402","Exploring x402 payment protocol integration with USDC on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base L2","Use cases requiring no-signup, pay-as-you-go API access"],"notFor":["Users who need documented input/output schemas before calling","High-volume use cases where $0.02/request adds up without clear value proposition","Anyone needing free or API-key-based authentication"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.578Z"},"updatedAt":"2026-04-23T03:47:42.829Z"}}