{"id":"cb0a0181-ed0e-48e6-a06d-c0ff49f0cffd","shortId":"EGJ4rt","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 on the Base network using the x402 protocol and USDC. The specific endpoint `/api/endpoint-26` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys, subscriptions, 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 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. However, the specific endpoint `/api/endpoint-26` does not map to any of the named endpoints on the landing page, so its exact functionality is unclear.\n\nThe endpoint is live and returns a well-formed x402 challenge (HTTP 402) with payment accepted via the \"exact\" scheme on Base mainnet to USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. The payment timeout is 300 seconds. Documentation pages (/docs, /pricing, /api, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so there is no schema documentation, request/response examples, or detailed feature description available.","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":["The endpoint path /api/endpoint-26 does not match any of the named endpoints listed on the landing page; its actual functionality is unknown.","All documentation pages (/docs, /pricing, /api, /README) returned no useful content — only a 'Connect wallet' prompt.","No OpenAPI spec, request schema, or response schema is available; callers cannot know what to send or expect back.","The platform appears to be a generic demo or placeholder site; endpoint reliability and data quality are unverified."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-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/endpoint-26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but the specific functionality of /api/endpoint-26 is unknown — it doesn't correspond to any named endpoint on the site. All documentation pages are empty (just 'Connect wallet'). No request/response schema, no examples, and no description of what the endpoint actually 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'/api/endpoint-26':62,160 '/docs':216 '/pricing':217 '/readme':219 '/request':12,30,154 '0.02':11,29,79,153 '000':73 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':207 '20':72 '300':212 '402':193 'Base network API' 'USDC micropayment API' 'accept':196 'access':67 'across':111 'advertis':90,109 'ai':121 'analysi':125 'analyt':115 'api':6,16,24,34,46,66,83 'attach':93 'avail':243 'base':8,26,51,74,202 'base-network' 'broader':106 'call':4,22,81 'caller':91 'categori':113 'challeng':191 'charg':69 'classif':128 'collect':40 'connect':224 'content':230 'contract':206 'convers':145 'crypto-paid endpoint' 'data':114,118 'descript':242 'detail':240 'document':214,236 'embed':129 'endpoint':47,61,110,149,159,169,181 'estim':139 'exact':176,199 'exampl':238 'exchang':134 'export':119 'featur':241 'feed':133 'financ':130 'form':189 'four':112 'function':177 'gas':138 'generat':146 'geocod':143 'header':98 'host':38 'howev':156 'http':192 'http-post' 'i.e':78 'infrastructur':141 'insight':120 'key':17,35,84 'label':64 'land':172 'learn':123 'limit':88 'list':148 'live':183 'lowpaymentfee' 'lowpaymentfee.com':37,107 'machin':122 'mainnet':203 'map':163 'metric':116 'name':168 'network':52 'no-api-key' 'page':173,215 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':97,103,195,209 'per':3,21,44,80 'platform':108 'premium':5,23,65 'premium API access' 'price':132,155 'prompt':226 'proof':104 'protocol':56 'quot':137 'rate':87,135 'report':117 'request':45 'request/response':237 'requir':18,36 'return':185,221 'schema':235 'scheme':200 'second':213 'sentiment':124 'settl':48 'share':150 'simpli':92 'specif':60,158 'subscript':85 'substant':229 'summar':127 'text':126 'timeout':210 'token':136 'unclear':179 'unit':75 'usdc':14,32,58,77,205 'usdc-settlement' 'use':53 'util':142 'valid':101,144 'via':9,27,197 'wallet':225 'web3':131 'well':188 'well-form':187 'x':96 'x-payment':95 'x402':10,28,55,102,190 'x402 API' 'x402-payment'","prices":[{"id":"f9d95cdc-1356-459a-b8d4-4257ea6bc22e","listingId":"cb0a0181-ed0e-48e6-a06d-c0ff49f0cffd","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-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":"2026-04-18T18:33:27.131Z"}],"sources":[{"listingId":"cb0a0181-ed0e-48e6-a06d-c0ff49f0cffd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-26","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:27.131Z","lastSeenAt":"2026-04-23T02:00:23.398Z"}],"details":{"listingId":"cb0a0181-ed0e-48e6-a06d-c0ff49f0cffd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-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 endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/endpoint-26"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/endpoint-26"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"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 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","AI agents that need keyless, pay-as-you-go API access","Low-cost per-request usage without commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone requiring a known, well-documented response schema before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:32:55.57Z"},"updatedAt":"2026-04-23T02:00:23.398Z"}}