{"id":"6d9940b3-325f-44a4-832c-a65947f50c7f","shortId":"ZuqZjz","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-94`) is listed as \"Premium API Access\" and accepts USDC payments on Base. The x402 challenge confirms the endpoint is live and charges a maximum of 20,000 base units of USDC (i.e., $0.02 per request, since USDC uses 6 decimals). Payment is made inline via the X-PAYMENT header — no API keys, accounts, or rate limits are required.\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 path (`/api/endpoint-94`) does not correspond to any of the named endpoints on the site's landing page, so its exact functionality is unclear.\n\nThe endpoint settles payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC at contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base. The response MIME type is `application/json`. Documentation beyond the landing page is essentially empty (all subpages just show \"Connect wallet\"), so there is no schema, example request/response, or detailed usage guide available.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","json-response","http-post"],"categories":["api","misc"],"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-94 does not match any of the named endpoints listed on the provider's landing page — its actual functionality is unknown.","All documentation pages (/docs, /api, /pricing, /README) return only 'Connect wallet' with no substantive content.","No OpenAPI spec, request schema, or response schema is available.","No examples of request or response payloads exist in any crawled material."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-94","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-94","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 captured) and pricing is clear ($0.02 USDC on Base). However, the specific endpoint path /api/endpoint-94 is not documented anywhere on the site, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs. The actual functionality behind this endpoint is 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'/request':12,30,170 '0.02':11,29,94,169 '000':88 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':205 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':210 '20':87 '6':100 'Base network API' 'USDC micropayment API' 'accept':69 'access':48,67 'account':115 'across':127 'address':204 'advertis':125 'ai':137 'analysi':141 'analyt':131 'api':6,16,24,34,46,66,113 'application/json':218 'avail':244 'base':8,26,56,73,89,212 'beyond':220 'broader':122 'call':4,22 'categori':129 'challeng':76 'charg':83 'classif':144 'collect':40 'confirm':77 'connect':231 'contract':209 'convers':161 'correspond':180 'crypto-paid endpoint' 'data':130,134 'decim':101 'detail':241 'document':219 'embed':145 'empti':226 'endpoint':47,60,79,126,165,175,186,200 'essenti':225 'estim':155 'exact':195 'exampl':238 'exchang':150 'export':135 'feed':149 'financ':146 'four':128 'function':196 'gas':154 'generat':162 'geocod':159 'guid':243 'header':111 'host':38 'howev':172 'http-post' 'i.e':93 'infrastructur':157 'inlin':105 'insight':136 'json-response' 'key':17,35,114 'land':191,222 'learn':139 'limit':118 'list':63,164 'live':81 'lowpaymentfee' 'lowpaymentfee.com':37,123 'machin':138 'made':104 'maximum':85 'metric':132 'mime':215 'name':185 'network':57 'no-api-key' 'page':192,223 'particular':174 'path':176 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':52,71,102,110,202 'per':3,21,44,95 'platform':124 'premium':5,23,65 'premium API access' 'price':148,171 'protocol':53 'quot':153 'rate':117,151 'report':133 'request':45,96 'request/response':239 'requir':18,36,120 'respons':214 'schema':237 'sentiment':140 'settl':201 'share':166 'show':230 'sinc':97 'site':189 'specif':59 'subpag':228 'summar':143 'text':142 'token':152 'type':216 'unclear':198 'unit':90 'usag':242 'usdc':14,32,70,92,98,207 'usdc-base' 'use':99,206 'util':158 'valid':160 'via':9,27,49,106 'wallet':232 'web3':147 'x':109 'x-payment':108 'x402':10,28,51,75 'x402 API' 'x402-payment'","prices":[{"id":"addafb19-00d6-443c-bd83-ac6c305e4736","listingId":"6d9940b3-325f-44a4-832c-a65947f50c7f","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-94","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:11.331Z"}],"sources":[{"listingId":"6d9940b3-325f-44a4-832c-a65947f50c7f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-94","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:11.331Z","lastSeenAt":"2026-04-22T12:03:11.540Z"}],"details":{"listingId":"6d9940b3-325f-44a4-832c-a65947f50c7f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-94 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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-94"},{"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 address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is used for payment on Base.","source_url":"https://lowpaymentfee.com/api/endpoint-94"},{"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 account signup","Agent-driven workflows that pay per call using USDC on Base","Testing x402 payment protocol integrations against a low-cost live endpoint"],"bestFor":["Developers exploring x402 payment protocol integration","AI agents that need keyless, pay-per-use API access","Low-cost experimentation with crypto-settled API calls"],"notFor":["Users who need detailed documentation or guaranteed SLAs","Anyone requiring a known, well-documented API function (the exact capability of /api/endpoint-94 is unspecified)","Users without access to USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.654Z"},"updatedAt":"2026-04-22T12:03:11.540Z"}}