{"id":"aec3f5c9-1749-4f0d-bb11-92768fdfbef5","shortId":"cFfrQH","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\" behind an x402 paywall, settling payments in USDC on the Base network. The x402 challenge confirms the endpoint is live and accepts POST requests, charging up to 20,000 base units of USDC (i.e., $0.02 per request, since USDC uses 6 decimals). No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises multiple API 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 priced at $0.02 per request. However, this specific listing is for `/api/resource/26`, which is described only as \"Premium API Access\" with no further documentation on what data or functionality it returns. The docs, pricing, and README pages on the site are gated behind a wallet-connect flow and yielded no additional content during crawl.\n\nBecause there is no OpenAPI schema, no request/response examples, and no documentation explaining what `/api/resource/26` actually does, the practical utility of this endpoint cannot be confirmed from available materials. The payment mechanism is verified live and functional via the captured 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api","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 for /api/resource/26 — the endpoint's actual functionality is unknown.","No OpenAPI or output schema provided beyond basic HTTP method info.","All docs/pricing/README pages on the site returned only a 'Connect wallet' prompt with no usable content.","The endpoint path '/api/resource/26' does not match any of the advertised API paths on the landing page."],"endpointUrl":"https://lowpaymentfee.com/api/resource/26","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/resource/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what /api/resource/26 actually returns. No OpenAPI schema, no request/response examples, and the site's docs pages are empty behind a wallet-connect gate. This is effectively a stub 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'/request':13,28 '0.02':12,27,73,147 '000':67 '20':66 '402':240 '6':79 'Base network API' 'USDC micropayment API' 'accept':60 'access':7,22,38,164 'actual':215 'addit':196 'advertis':107 'ai':118 'analysi':122 'analyt':112 'api':6,21,37,82,109,163 'attach':91 'avail':227 'base':9,24,49,68 'base-network' 'behind':39,187 'broader':104 'call':4,19 'caller':89 'cannot':223 'captur':239 'categori':110 'challeng':53,241 'charg':63 'classif':125 'confirm':54,225 'connect':191 'content':197 'convers':142 'crawl':199 'crypto-paid API' 'data':111,115,171 'decim':80 'describ':159 'doc':177 'document':168,211 'embed':126 'endpoint':32,56,222 'estim':136 'exampl':208 'exchang':131 'explain':212 'export':116 'feed':130 'financ':127 'flow':192 'function':173,236 'gas':135 'gate':186 'generat':143 'geocod':140 'header':96 'howev':150 'i.e':72 'infrastructur':138 'insight':117 'key':83 'learn':120 'limit':86 'list':153 'live':58,234 'lowpaymentfee' 'lowpaymentfee.com':34,105 'machin':119 'materi':228 'mechan':231 'metric':113 'multipl':108 'network':50 'no-api-key' 'openapi':204 'page':181 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':44,95,101,230 'paywal':42 'per':3,18,74,148 'platform':106 'post':61 'post-method' 'practic':218 'premium':5,20,36,162 'premium API access' 'price':129,145,178 'proof':102 'provid':35 'quot':134 'rate':85,132 'readm':180 'report':114 'request':62,75,149 'request/response':207 'requir':88 'return':175 'schema':205 'sentiment':121 'settl':43 'simpli':90 'sinc':76 'site':184 'specif':152 'summar':124 'text':123 'token':133 'unit':69 'usdc':15,30,46,71,77 'usdc-settlement' 'use':78 'util':139,219 'valid':99,141 'verifi':233 'via':10,25,237 'wallet':190 'wallet-connect':189 'web3':128 'x':94 'x-payment':93 'x402':11,26,41,52,100 'x402 API' 'x402-payment' 'yield':194","prices":[{"id":"e5c98595-e26d-41f0-bc80-00ae850ae672","listingId":"aec3f5c9-1749-4f0d-bb11-92768fdfbef5","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/resource/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:51.671Z"}],"sources":[{"listingId":"aec3f5c9-1749-4f0d-bb11-92768fdfbef5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/26","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:51.671Z","lastSeenAt":"2026-04-22T23:00:59.472Z"}],"details":{"listingId":"aec3f5c9-1749-4f0d-bb11-92768fdfbef5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/26 \\\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 x402 challenge returns 402 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/resource/26"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/resource/26"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Multiple API categories listed: Data & Analytics, AI & ML, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a premium API endpoint with per-request USDC micropayments on Base","Integrating pay-as-you-go API calls into agent workflows without API key management","Demonstrating x402 protocol payment flows for developer experimentation"],"bestFor":["Developers exploring x402 protocol integrations","Agents that can settle USDC payments on Base L2","Use cases requiring keyless, pay-per-call API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Applications requiring free or fiat-settled API access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.534Z"},"updatedAt":"2026-04-22T23:00:59.472Z"}}