{"id":"cabb1ec0-658b-4881-9579-d646015e6546","shortId":"UXkBwf","kind":"x402","title":"Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints settled over the x402 protocol on the Base network using USDC. The specific endpoint `/api/endpoint-38` is labeled \"Premium API Access\" and accepts POST requests. Payment is 0.02 USDC per call (maxAmountRequired of 20,000 base units with 6-decimal USDC). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises 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 listed endpoints share the same $0.02/request pricing.\n\nHowever, the specific endpoint `/api/endpoint-38` does not correspond to any of the named endpoints on the site's landing page. There is no documentation, request/response schema, or example available for this particular path. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what this endpoint actually does, callers should treat it as an opaque premium access point until further documentation is published.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["Endpoint path /api/endpoint-38 does not match any documented endpoint on the provider's landing page — its actual functionality is unknown.","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no substantive content.","No request or response schema is available; callers cannot know what to send or what to expect back.","Provider site appears to be a generic x402 demo or template rather than a production service."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-38","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/endpoint-38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what /api/endpoint-38 actually does — no input schema, no output schema, no examples. The docs/pricing/API pages are all empty beyond a wallet-connect prompt. The endpoint path doesn't match any named service on the landing page. This is effectively a stub 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'/request':12,30,161 '0.02':11,29,74,160 '000':81 '20':80 '6':85 'Base network API' 'USDC micropayment API' 'accept':69 'access':67,228 'across':118 'actual':218 'advertis':116 'ai':128 'analysi':132 'analyt':122 'api':6,16,24,34,46,66,89,200 'attach':100 'avail':191 'base':8,26,55,82 'base-network' 'broader':113 'call':4,22,77 'caller':98,220 'categori':120 'classif':135 'collect':40 'commit':95 'connect':206 'content':212 'convers':152 'correspond':170 'crypto-paid endpoint' 'data':121,125 'decim':86 'doc':197 'document':186,232 'embed':136 'endpoint':47,61,117,156,166,176,217 'estim':146 'exampl':190 'exchang':141 'export':126 'feed':140 'financ':137 'four':119 'gas':145 'generat':153 'geocod':150 'header':105 'host':38 'howev':163 'http-post' 'infrastructur':148 'insight':127 'key':17,35,90 'know':214 'label':64 'land':181 'learn':130 'limit':92 'list':155 'lowpaymentfee' 'lowpaymentfee.com':37,114 'machin':129 'maxamountrequir':78 'metric':123 'name':175 'network':56 'no-api-key' 'opaqu':226 'page':182,201 'particular':194 'path':195 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':72,104,110 'per':3,21,44,76 'platform':115 'point':229 'post':70 'premium':5,23,65,227 'premium API access' 'price':139,162,198 'prompt':208 'proof':111 'protocol':52 'publish':234 'quot':144 'rate':91,142 'report':124 'request':45,71 'request/response':187 'requir':18,36,97 'return':203 'schema':188 'sentiment':131 'settl':48 'share':157 'simpli':99 'site':179 'specif':60,165 'substant':211 'summar':134 'text':133 'token':143 'treat':222 'unit':83 'upfront':94 'usdc':14,32,58,75,87 'usdc-settlement' 'use':57 'util':149 'valid':108,151 'via':9,27 'wallet':207 'web3':138 'without':213 'x':103 'x-payment':102 'x402':10,28,51,109 'x402 API' 'x402-payment'","prices":[{"id":"a019285b-c8ec-44f1-883f-7aad79155a30","listingId":"cabb1ec0-658b-4881-9579-d646015e6546","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/endpoint-38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:01.705Z"}],"sources":[{"listingId":"cabb1ec0-658b-4881-9579-d646015e6546","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-38","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:01.705Z","lastSeenAt":"2026-04-22T23:01:00.007Z"}],"details":{"listingId":"cabb1ec0-658b-4881-9579-d646015e6546","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-38 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/endpoint-38"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/endpoint-38"},{"claim":"The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API endpoint without needing API key registration","Agent-driven workflows that settle per-call costs in USDC on Base","Testing x402 payment flows against a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol integration","AI agents that need keyless, pay-as-you-go API access","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before calling","Anyone without a Base-network USDC wallet or x402-compatible client","High-throughput production workloads requiring well-documented schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.076Z"},"updatedAt":"2026-04-22T23:01:00.007Z"}}