{"id":"519d515f-f9f8-438a-8624-c36d3e594db9","shortId":"aQCM86","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-19`) 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 utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing. However, this particular endpoint path (`/api/endpoint-19`) does not correspond to any of the named endpoints on the site's landing page, so its exact functionality is unclear.\n\nThe endpoint responds to POST requests and returns `application/json`. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. Documentation pages (/docs, /pricing, /README) returned only a \"Connect wallet\" prompt with no substantive content, so detailed request/response schemas are unavailable.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","post-method"],"categories":["api","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["The path /api/endpoint-19 does not match any of the named endpoints listed on the provider's landing page; its actual functionality is unknown.","All documentation pages (/docs, /pricing, /README, /api) returned only 'Connect wallet' with no substantive content.","No OpenAPI spec, request schema, or response schema is available — callers cannot know what to send or expect back.","The provider site appears to be a generic x402 demo or placeholder; endpoint reliability and data quality are unverified."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-19","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-19","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 specific functionality of /api/endpoint-19 is unknown — it doesn't match any named endpoint on the landing page. Documentation pages are empty stubs. No request/response schema is 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'/docs':217 '/pricing':218 '/readme':219 '/request':17,34,166 '0.02':16,33,91,165 '000':86 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':209 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':212 '20':85 'Base network API' 'USDC micropayment API' 'accept':67 'access':46,65 'across':123 'address':208 'advertis':102,121 'ai':133 'analysi':137 'analyt':127 'api':6,23,44,64,96 'application/json':203 'attach':105 'base':9,26,54,71,87,214 'broader':118 'call':4,21 'caller':103 'categori':125 'challeng':74 'classif':140 'collect':38 'confirm':75 'connect':223 'content':229 'convers':157 'correspond':176 'crypto-paid endpoint' 'data':126,130 'detail':231 'document':215 'embed':141 'endpoint':7,24,45,58,77,122,161,171,182,196 'estim':151 'exact':191 'exchang':146 'export':131 'feed':145 'financ':142 'function':192 'gas':150 'generat':158 'geocod':155 'header':110 'host':36 'howev':168 'infrastructur':153 'insight':132 'json-api' 'key':97 'land':187 'learn':135 'limit':100 'list':61,160 'live':79 'lowpaymentfee' 'lowpaymentfee.com':35,119 'machin':134 'maximum':83 'metric':128 'name':181 'network':55 'no-api-key' 'page':188,216 'particular':170 'path':172 'pay':2,19,41 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':40 'payment':50,69,109,115,204 'per':3,20,42,93 'platform':120 'post':199 'post-method' 'premium':5,22,63 'premium API access' 'price':144,167 'prompt':225 'proof':116 'protocol':51 'quot':149 'rate':99,147 'report':129 'request':43,94,200 'request/response':232 'requir':81 'respond':197 'return':202,220 'schema':233 'sent':206 'sentiment':136 'settl':12,29 'sever':124 'share':162 'simpli':104 'site':185 'specif':57 'substant':228 'summar':139 'text':138 'token':148 'unavail':235 'unclear':194 'unit':88 'usd':92 'usdc':14,31,68,90,211 'usdc-base' 'use':210 'util':154 'valid':113,156 'via':10,27,47 'wallet':224 'web3':143 'x':108 'x-payment':107 'x402':11,28,49,73,114 'x402 API' 'x402-payment'","prices":[{"id":"756a28cb-0d44-4518-89bf-0d3ea919a3c8","listingId":"519d515f-f9f8-438a-8624-c36d3e594db9","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-19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:05.338Z"}],"sources":[{"listingId":"519d515f-f9f8-438a-8624-c36d3e594db9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-19","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:05.338Z","lastSeenAt":"2026-04-23T00:31:01.100Z"}],"details":{"listingId":"519d515f-f9f8-438a-8624-c36d3e594db9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-19 \\\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 maxAmountRequired of 20000 base units of USDC on Base, equating to $0.02 per request.","source_url":"https://lowpaymentfee.com/api/endpoint-19"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 and payTo is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.","source_url":"https://lowpaymentfee.com/api/endpoint-19"},{"claim":"Documentation pages (/docs, /pricing, /README) returned only a 'Connect wallet' prompt.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API without traditional API key management","Agent-driven workflows that need to pay per call using USDC on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment flows","AI agents with Base USDC wallets needing on-demand API access","Low-volume, pay-as-you-go API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume use cases where $0.02/request adds up significantly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:38:18.116Z"},"updatedAt":"2026-04-23T00:31:01.100Z"}}