{"id":"5a9d1595-8099-45c1-b46c-514c778ce4cb","shortId":"GPwSBD","kind":"x402","title":"Pay-per-call premium API endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call premium API endpoint on Base via x402, settled in USDC at $0.02/request.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/endpoint-8`) is listed as \"Premium API Access\" and accepts USDC payments on Base. The x402 challenge confirms the endpoint is live and requires a maximum of 20,000 base units of USDC (0.02 USD) per request. No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises endpoints across several 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 (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request. However, this particular endpoint path (`/api/endpoint-8`) does not correspond to any of the named endpoints on the landing page, so its exact functionality is unclear.\n\nThe endpoint accepts POST requests and returns `application/json`. Payment is settled on the Base network to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). Documentation pages (/docs, /pricing, /README) returned only a \"Connect wallet\" prompt with no substantive content during the crawl.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["general","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The path /api/endpoint-8 does not correspond to any named endpoint on the lowpaymentfee.com landing page; its actual functionality is unknown.","All documentation pages (/docs, /pricing, /README, /api) returned only 'Connect wallet' with no substantive content.","No input or output schema is available beyond the basic x402 outputSchema stub.","The site appears to be a demonstration or placeholder platform; endpoint reliability and data quality are unverified."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-8","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-8","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 the exact functionality of /api/endpoint-8 is unknown — it doesn't map to any named endpoint on the site. Documentation pages returned no content. No input/output schema, no examples, and no description of what the endpoint actually 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'/docs':214 '/pricing':215 '/readme':216 '/request':17,34 '0.02':16,33,91,163 '000':86 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':208 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':211 '20':85 'Base network API' 'USDC micropayment endpoint' 'accept':67,193 'access':46,65 'across':123 'address':207 'advertis':102,121 'ai':133 'analysi':137 'analyt':127 'api':6,23,44,64,96 'application/json':198 'attach':105 'base':9,26,54,71,87,204 'base-network' 'broader':118 'call':4,21 'caller':103 'categori':125 'challeng':74 'classif':140 'collect':38 'confirm':75 'connect':220 'content':226 'convers':156 'correspond':174 'crawl':229 'crypto-paid API' 'data':126,130 'document':212 'embed':141 'endpoint':7,24,45,58,77,122,159,169,180,192 'estim':151 'exact':187 'exchang':146 'export':131 'feed':145 'financ':142 'function':188 'gas':150 'generat':157 'geocod':154 'header':110 'host':36 'howev':166 'infrastructur':153 'insight':132 'json-response' 'key':97 'land':183 'learn':135 'limit':100 'list':61 'live':79 'lowpaymentfee' 'lowpaymentfee.com':35,119 'machin':134 'maximum':83 'metric':128 'name':179 'network':55,205 'no-api-key' 'page':184,213 'particular':168 'path':170 'pay':2,19,41 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':40 'payment':50,69,109,115,199 'per':3,20,42,93,164 'platform':120 'post':194 'post-method' 'premium':5,22,63 'premium API access' 'price':144,161 'prompt':222 'proof':116 'protocol':51 'quot':149 'rate':99,147 'report':129 'request':43,94,165,195 'requir':81 'return':197,217 'sentiment':136 'settl':12,29,201 'sever':124 'simpli':104 'specif':57 'substant':225 'summar':139 'text':138 'token':148 'unclear':190 'unit':88 'usd':92 'usdc':14,31,68,90,210 'usdc-settlement' 'use':209 'valid':113,155 'via':10,27,47 'wallet':221 'web3':143 'x':108 'x-payment':107 'x402':11,28,49,73,114 'x402 API' 'x402-payment'","prices":[{"id":"a1646080-0008-42bd-a6c4-403d4578ffd9","listingId":"5a9d1595-8099-45c1-b46c-514c778ce4cb","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-8","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:42.698Z"}],"sources":[{"listingId":"5a9d1595-8099-45c1-b46c-514c778ce4cb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-8","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:42.698Z","lastSeenAt":"2026-04-22T11:31:07.753Z"}],"details":{"listingId":"5a9d1595-8099-45c1-b46c-514c778ce4cb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-8 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns status 402 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/endpoint-8"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/endpoint-8"},{"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 keys or subscriptions","Agent-driven workflows that need to pay per call using USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that can autonomously pay for API calls via crypto","Users who want no-commitment, pay-as-you-go API access"],"notFor":["Users who need detailed documentation or well-defined input/output schemas before integrating","Anyone requiring fiat-only payment methods (this endpoint requires USDC on Base)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.169Z"},"updatedAt":"2026-04-22T11:31:07.753Z"}}