{"id":"cc9d1331-cdcf-4e0a-854a-2d0fd360a87d","shortId":"ZkCMDD","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 via the x402 protocol on the Base network using USDC. This specific endpoint (`/api/endpoint-80`) is listed as \"Premium API Access\" and accepts POST requests. Payment is 0.02 USDC per call (maxAmountRequired of 20,000 base units with 6-decimal USDC). 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 are priced at $0.02 per request. However, this listing covers `/api/endpoint-80` specifically, which is described only as \"Premium API Access\" without further detail on what data or functionality it returns.\n\nThe endpoint is live and returns a well-formed x402 challenge (version 1, scheme \"exact\") paying to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` in USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The response MIME type is `application/json`. Documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the actual request/response schema for this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","402 payment endpoint"],"warnings":["The specific functionality of /api/endpoint-80 is completely undocumented — 'Premium API Access' is the only description available.","All documentation pages (/docs, /api, /pricing, /README) return only 'Connect wallet' with no actual content.","No request body schema or response schema is provided, so callers cannot know what to send or what to expect back.","This endpoint path (/api/endpoint-80) does not match any of the named endpoints listed on the landing page, raising questions about what it actually does."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-80","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-80","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 actual functionality behind '/api/endpoint-80' is undocumented. No request/response schema, no examples, and all documentation pages are blank ('Connect wallet'). The listing is effectively a stub with only pricing and protocol details 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'/request':12,30 '0.02':11,29,75,159 '000':82 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':205 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':208 '1':199 '20':81 '402 payment endpoint' '6':86 'Base network API' 'USDC micropayment API' 'accept':70 'access':68,175 'across':119 'actual':235 'address':204 'advertis':117 'ai':129 'analysi':133 'analyt':123 'api':6,16,24,34,46,67,90,174 'application/json':216 'attach':101 'base':8,26,55,83,210 'base-network' 'beyond':218 'broader':114 'call':4,22,78 'caller':99 'categori':121 'challeng':197 'classif':136 'collect':40 'commit':96 'connect':231 'convers':153 'cover':165 'data':122,126,181 'decim':87 'describ':170 'detail':178 'document':217 'embed':137 'empti':224 'endpoint':47,61,118,187,240 'essenti':223 'estim':147 'exact':201 'exchang':142 'export':127 'feed':141 'financ':138 'form':195 'four':120 'function':183 'gas':146 'generat':154 'geocod':151 'header':106 'host':38 'howev':162 'http-post' 'infrastructur':149 'insight':128 'json-response' 'key':17,35,91 'land':220 'learn':131 'limit':93 'list':64,164 'live':189 'lowpaymentfee' 'lowpaymentfee.com':37,115 'machin':130 'maxamountrequir':79 'metric':124 'mime':213 'network':56 'no-api-key' 'page':221,228 'pay':2,20,43,202 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':73,105,111 'per':3,21,44,77,160 'platform':116 'post':71 'premium':5,23,66,173 'premium API access' 'price':140,157 'proof':112 'protocol':52 'quot':145 'rate':92,143 'report':125 'request':45,72,161 'request/response':236 'requir':18,36,98 'respons':212 'return':185,191 'schema':237 'scheme':200 'sentiment':132 'settl':48 'show':230 'simpli':100 'specif':60,167 'sub':227 'sub-pag':226 'summar':135 'text':134 'token':144 'type':214 'unit':84 'unknown':242 'upfront':95 'usdc':14,32,58,76,88,207 'usdc-settlement' 'use':57 'util':150 'valid':109,152 'version':198 'via':9,27,49 'wallet':232 'web3':139 'well':194 'well-form':193 'without':176 'x':104 'x-payment':103 'x402':10,28,51,110,196 'x402 API' 'x402-payment'","prices":[{"id":"8871d5e1-e075-4ffa-828b-4717e169cd58","listingId":"cc9d1331-cdcf-4e0a-854a-2d0fd360a87d","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-80","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:51.374Z"}],"sources":[{"listingId":"cc9d1331-cdcf-4e0a-854a-2d0fd360a87d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-80","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:51.374Z","lastSeenAt":"2026-04-22T19:30:53.525Z"}],"details":{"listingId":"cc9d1331-cdcf-4e0a-854a-2d0fd360a87d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-80 \\\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":"Endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/endpoint-80"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/endpoint-80"},{"claim":"Platform offers 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 costs in USDC on Base","Testing x402 payment flows against a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol integrations","AI agents that need keyless, pay-as-you-go API access","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Users who need detailed documentation or well-defined request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:40.529Z"},"updatedAt":"2026-04-22T19:30:53.525Z"}}