{"id":"b506e9cf-a9de-406b-bf4e-16f29a7995e3","shortId":"s4sdEn","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 accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/endpoint-27`) is listed as \"Premium API Access\" and accepts USDC payments on Base at a maximum cost of $0.02 per request (20,000 base units of USDC with 6 decimals). 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. However, this particular endpoint (`/api/endpoint-27`) does not correspond to any of the named endpoints on the site's landing page, so its exact functionality is unclear.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with scheme \"exact\" on the Base network, paying to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The output schema indicates it accepts HTTP POST requests and is discoverable. Documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so request/response formats are unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","base-network","usdc-settlement","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-27 does not correspond to any named endpoint on the landing page — its actual functionality is undocumented","All documentation, pricing, API, and README pages render only 'Connect wallet' with no useful content","No request body schema or response schema is available; callers cannot know what to send or expect back","The endpoint's purpose is entirely unclear beyond the generic label 'Premium API Access'"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-27","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-27","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 402 challenge, but /api/endpoint-27 does not match any named endpoint on the site. Documentation pages are empty ('Connect wallet' only). No request/response schema, no examples, and the actual functionality of this specific endpoint is 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'/request':12,30,164 '0.02':11,29,79,163 '000':83 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':214 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':217 '20':82 '402':203 '6':89 'Base network API' 'USDC micropayment API' 'accept':69,223 'access':48,67 'across':121 'address':213 'advertis':119 'ai':131 'analysi':135 'analyt':125 'api':6,16,24,34,46,66,92 'attach':103 'base':8,26,56,73,84,209 'base-network' 'beyond':231 'broader':116 'call':4,22 'caller':101 'categori':123 'challeng':201 'classif':138 'collect':40 'commit':98 'connect':244 'convers':155 'correspond':173 'cost':77 'crypto-paid endpoint' 'data':124,128 'decim':90 'discover':229 'document':230 'embed':139 'empti':237 'endpoint':47,60,120,159,169,179,193 'essenti':236 'estim':149 'exact':188,206 'exchang':144 'export':129 'feed':143 'financ':140 'format':248 'four':122 'function':189 'gas':148 'generat':156 'geocod':153 'header':108 'host':38 'howev':166 'http':202,224 'http-post' 'indic':221 'infrastructur':151 'insight':130 'key':17,35,93 'land':184,233 'learn':133 'limit':95 'list':63,158 'live':195 'lowpaymentfee' 'lowpaymentfee.com':37,117 'machin':132 'maximum':76 'metric':126 'name':178 'network':57,210 'no-api-key' 'output':219 'page':185,234,241 'particular':168 'pay':2,20,43,211 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':52,71,107,113 'per':3,21,44,80 'platform':118 'post':225 'premium':5,23,65 'premium API access' 'price':142,165 'proof':114 'protocol':53 'quot':147 'rate':94,145 'report':127 'request':45,81,226 'request/response':247 'requir':18,36,100 'return':197 'schema':220 'scheme':205 'sentiment':134 'share':160 'show':243 'simpli':102 'site':182 'specif':59 'sub':240 'sub-pag':239 'summar':137 'text':136 'token':146 'unclear':191 'unit':85 'unknown':250 'upfront':97 'usdc':14,32,70,87,216 'usdc-settlement' 'use':215 'util':152 'valid':111,154,199 'via':9,27,49 'wallet':245 'web3':141 'x':106 'x-payment':105 'x402':10,28,51,112,200 'x402 API' 'x402-payment'","prices":[{"id":"7535810e-99be-4b79-a885-f01ec02e2d72","listingId":"b506e9cf-a9de-406b-bf4e-16f29a7995e3","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-27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:04.317Z"}],"sources":[{"listingId":"b506e9cf-a9de-406b-bf4e-16f29a7995e3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-27","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:04.317Z","lastSeenAt":"2026-04-22T21:30:34.449Z"}],"details":{"listingId":"b506e9cf-a9de-406b-bf4e-16f29a7995e3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-27 \\\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 endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/endpoint-27"},{"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 contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/endpoint-27"},{"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 payments in USDC on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol on Base","AI agents that need keyless, pay-as-you-go API access","Low-volume callers who want no subscription or commitment"],"notFor":["Users who need detailed API documentation or well-defined request/response schemas","High-volume production workloads where per-call crypto payments add latency","Anyone who needs to know exactly what the endpoint returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.103Z"},"updatedAt":"2026-04-22T21:30:34.449Z"}}