{"id":"162a71dc-3a26-4b36-9a37-b4abc5a7b605","shortId":"3LHs7n","kind":"x402","title":"Pay-per-call premium API endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call premium API endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com/api/endpoint-71 is an x402-gated API labeled \"Premium API Access.\" It accepts POST requests and charges 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 per request (USDC uses 6 decimals). Payment is handled via the x402 exact scheme with no API keys or rate limits required — callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe broader lowpaymentfee.com platform advertises multiple API categories including 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 endpoints are listed at $0.02 per request. However, this specific endpoint (/api/endpoint-71) 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 proper 402 challenge. Documentation pages (/docs, /pricing, /README) all resolve but contain only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation describing what this particular endpoint does or what input it expects. The output schema indicates it is a discoverable HTTP POST endpoint returning application/json.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","json-response"],"categories":["api","misc"],"synonyms":["premium API","x402 endpoint","pay-per-request API","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["The specific endpoint /api/endpoint-71 is not listed among the named APIs on the landing page; its actual functionality is unknown.","All documentation pages (/docs, /pricing, /README) contain only a 'Connect wallet' prompt with no substantive content.","No OpenAPI schema, request format, or response examples are available — integration requires trial and error.","No robots.txt or agents.txt found on the domain."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-71","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-71","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 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific functionality of /api/endpoint-71 is unknown — it doesn't match any named endpoint on the site. Docs pages are empty 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'/docs':195 '/pricing':196 '/readme':197 '/request':17,34 '0.02':16,33,71,154 '000':58 '0x8335':63 '20':57 '2913':64 '402':191 '6':76 'Base network API' 'USDC API' 'accept':52 'access':50 'advertis':111 'ai':123 'analysi':127 'analyt':117 'api':6,23,46,49,88,113 'application/json':246 'attach':96 'base':9,26,59,67 'base-network' 'broader':108 'call':4,21 'caller':94 'categori':114 'challeng':192 'charg':56 'classif':130 'connect':204 'contain':201 'content':210 'convers':147 'correspond':164 'data':116,120 'decim':77 'describ':223 'detail':221 'discover':241 'document':193,222 'embed':131 'endpoint':7,24,36,150,160,170,184,227,244 'equal':70 'estim':141 'exact':84,179 'exampl':218 'exchang':136 'expect':233 'export':121 'feed':135 'financ':132 'function':180 'gas':140 'gate':45 'generat':148 'geocod':145 'handl':80 'header':101 'howev':157 'http':242 'includ':115 'indic':237 'infrastructur':143 'input':231 'insight':122 'json-response' 'key':89 'label':47 'land':175 'learn':125 'limit':92 'list':152 'live':186 'lowpaymentfee' 'lowpaymentfee.com':39,109 'lowpaymentfee.com/api/endpoint-71':38 'machin':124 'metric':118 'micropayment API' 'multipl':112 'name':169 'network':68 'no-api-key' 'openapi':214 'output':235 'page':176,194 'particular':226 'pay':2,19 'pay-per-cal':1,18 'pay-per-call' 'pay-per-request API' 'payment':78,100,105 'per':3,20,72,155 'platform':110 'post':53,243 'premium':5,22,48 'premium API' 'price':134 'prompt':206 'proof':106 'proper':190 'quot':139 'rate':91,137 'report':119 'request':54,73,156 'request/response':217 'requir':93 'resolv':199 'return':188,245 'schema':215,236 'scheme':85 'sentiment':126 'settl':12,29 'simpli':95 'site':173 'specif':159 'substant':209 'summar':129 'text':128 'token':138 'unclear':182 'unit':60 'usdc':14,31,62,74 'usdc-settlement' 'use':75 'util':144 'valid':104,146 'via':10,27,81 'wallet':205 'web3':133 'x':99 'x-payment':98 'x402':11,28,44,83 'x402 endpoint' 'x402-gated':43 'x402-payment'","prices":[{"id":"81d5827e-af15-430b-820d-c9d0dbb0e05f","listingId":"162a71dc-3a26-4b36-9a37-b4abc5a7b605","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-71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:27.446Z"}],"sources":[{"listingId":"162a71dc-3a26-4b36-9a37-b4abc5a7b605","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-71","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:27.446Z","lastSeenAt":"2026-04-22T13:30:23.662Z"}],"details":{"listingId":"162a71dc-3a26-4b36-9a37-b4abc5a7b605","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-71 \\\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":"Endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/endpoint-71"},{"claim":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/endpoint-71"},{"claim":"All listed endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API endpoint with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless API access with crypto micropayments","Low-volume, pay-per-use API consumption without subscriptions"],"notFor":["Users who need detailed documentation or known input/output schemas before integrating","High-volume use cases where $0.02/request adds up without bulk discounts","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:52:46.072Z"},"updatedAt":"2026-04-22T13:30:23.662Z"}}