{"id":"821daca8-eeca-4af3-98f7-bdd93559eeb2","shortId":"JezELr","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-28`) 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, the specific endpoint `/api/endpoint-28` does not map to any of the named endpoints on the site's landing page, so its exact functionality is unclear.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests, settling payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The payment scheme is \"exact\" with a 300-second timeout. No OpenAPI schema, detailed documentation, or example responses were found — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","http-post"],"categories":["api","misc"],"synonyms":["premium API","x402 endpoint","pay-per-call API","USDC API","Base network API","lowpaymentfee","micropayment API"],"warnings":["The endpoint path /api/endpoint-28 does not correspond to any named endpoint on the provider's landing page; its actual functionality is unknown.","No OpenAPI schema, request/response examples, or meaningful documentation is available.","Docs, pricing, and API pages render only 'Connect wallet' with no usable content.","The exact behavior and output of this endpoint cannot be verified without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-28","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-28","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 there is no documentation, no OpenAPI schema, no example requests or responses, and the specific functionality of /api/endpoint-28 is unknown — it doesn't match any named endpoint on the landing page. The docs/pricing/API pages are all empty beyond a wallet-connect 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'/request':12,30,164 '0.02':11,29,79,163 '000':83 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':207 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':210 '20':82 '300':220 '6':89 'Base network API' 'USDC API' 'accept':69,200 'access':48,67 'across':121 'addit':248 'address':206 'advertis':119 'ai':131 'analysi':135 'analyt':125 'api':6,16,24,34,46,66,92,237 'attach':103 'base':8,26,56,73,84,212 'broader':116 'call':4,22 'caller':101 'categori':123 'challeng':194 'classif':138 'collect':40 'commit':98 'confirm':195 'connect':243 'content':249 'convers':155 'cost':77 'data':124,128 'decim':90 'detail':226 'doc':234 'document':227 'embed':139 'endpoint':47,60,120,159,169,179,197 'estim':149 'exact':188,217 'exampl':229 'exchang':144 'export':129 'feed':143 'financ':140 'found':232 'four':122 'function':189 'gas':148 'generat':156 'geocod':153 'header':108 'host':38 'howev':166 'http-post' 'infrastructur':151 'insight':130 'key':17,35,93 'land':184 'learn':133 'limit':95 'list':63,158 'live':199 'lowpaymentfee' 'lowpaymentfee.com':37,117 'machin':132 'map':173 'maximum':76 'metric':126 'micropayment API' 'name':178 'network':57 'no-api-key' 'openapi':224 'page':185,238 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':52,71,107,113,204,214 'per':3,21,44,80 'platform':118 'post':201 'premium':5,23,65 'premium API' 'price':142,165,235 'prompt':245 'proof':114 'protocol':53 'quot':147 'rate':94,145 'render':240 'report':127 'request':45,81,202 'requir':18,36,100 'respons':230 'schema':225 'scheme':215 'second':221 'sentiment':134 'settl':203 'share':160 'simpli':102 'site':182 'specif':59,168 'summar':137 'text':136 'timeout':222 'token':146 'unclear':191 'unit':85 'upfront':97 'usdc':14,32,70,87,209 'usdc-base' 'use':208 'util':152 'valid':111,154 'via':9,27,49 'wallet':244 'web3':141 'x':106 'x-payment':105 'x402':10,28,51,112,193 'x402 endpoint' 'x402-payment'","prices":[{"id":"61555e6c-2e03-4c3f-b791-ed71aaa8688d","listingId":"821daca8-eeca-4af3-98f7-bdd93559eeb2","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-28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:26.376Z"}],"sources":[{"listingId":"821daca8-eeca-4af3-98f7-bdd93559eeb2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-28","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:26.376Z","lastSeenAt":"2026-04-22T12:03:12.635Z"}],"details":{"listingId":"821daca8-eeca-4af3-98f7-bdd93559eeb2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-28 \\\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 402 with USDC on Base, maxAmountRequired 20000 (=$0.02), scheme exact, 300s timeout","source_url":"https://lowpaymentfee.com/api/endpoint-28"},{"claim":"The site advertises $0.02/request pricing 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-28"},{"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 pay per call using USDC on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","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 documentation or guaranteed SLAs before integrating","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":"2026-02-17T23:14:44.916Z"},"updatedAt":"2026-04-22T12:03:12.635Z"}}