{"id":"64b2d1a9-4e52-4b9b-99d5-8fdb8d23c4b7","shortId":"H9pP2s","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","tagline":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com is part of a suite of x402-protocol pay-per-request APIs hosted on the Base network. The specific resource `/api/v1/benefits/73` is labeled \"Premium API Access\" and accepts POST requests gated by an x402 payment challenge. Payment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 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 several 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 endpoints are listed at the same $0.02/request price point.\n\nHowever, the specific functionality behind `/api/v1/benefits/73` is not documented beyond its title \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and the crawled docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no additional content. The endpoint is confirmed live (returns a proper 402 challenge), but what data or service it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","http-post","no-api-key"],"categories":["api-gateway","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","402 payment required","premium API access"],"warnings":["No documentation exists for what /api/v1/benefits/73 actually returns upon successful payment","No OpenAPI or request/response schema available","All doc/pricing/API pages on the site return only a 'Connect wallet' prompt with no useful content","The endpoint name 'Premium API Access' is generic and does not describe a specific capability"],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/73","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/v1/benefits/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation of what the endpoint actually returns, no OpenAPI schema, no request/response examples, and the docs pages are empty. The specific resource '/api/v1/benefits/73' has only a generic title with no description of its 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'/request':17,34,179 '0.02':16,33,98,178 '000':93 '0x8335':83 '20':92 '2913':84 '402':232 '402 payment required' '6':103 'Base network API' 'USDC micropayment API' 'accept':68 'access':66,196 'across':135 'actual':240 'addit':222 'advertis':133 'ai':145 'analysi':149 'analyt':139 'api':5,22,52,65,106,195,211 'attach':117 'base':8,25,56,86,94 'base-network' 'behind':186 'beyond':191 'broader':130 'call':12,29 'caller':115 'categori':137 'challeng':76,233 'classif':152 'commit':112 'confirm':227 'connect':217 'content':223 'contract':82 'convers':169 'cost':90 'crawl':207 'data':138,142,236 'decim':104 'doc':208 'document':190 'embed':153 'endpoint':6,23,36,134,172,225 'equal':97 'estim':163 'exampl':204 'exchang':158 'export':143 'feed':157 'financ':154 'function':185 'gas':162 'gate':3,20,71 'generat':170 'geocod':167 'header':122 'host':53 'howev':182 'http-post' 'infrastructur':165 'insight':144 'key':107 'label':63 'learn':147 'limit':109 'list':174 'live':228 'lowpaymentfee' 'lowpaymentfee.com':38,131 'machin':146 'maximum':89 'metric':140 'network':57 'no-api-key' 'openapi':200 'page':212 'part':40 'pay':10,27,49 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':48 'payment':75,77,121,127,244 'per':11,28,50,99 'platform':132 'point':181 'post':69 'premium':4,21,64,194 'premium API access' 'price':156,180,209 'prompt':219 'proof':128 'proper':231 'protocol':47 'quot':161 'rate':108,159 'report':141 'request':51,70,100 'request/response':203 'requir':114 'resourc':60 'return':214,229,241 'schema':201 'sentiment':148 'servic':238 'settl':79 'sever':136 'simpli':116 'specif':59,184 'success':243 'suit':43 'summar':151 'text':150 'titl':193 'token':160 'unit':95 'unknown':246 'upfront':111 'upon':242 'usdc':14,31,81,101 'usdc-settlement' 'use':102 'util':166 'valid':125,168 'wallet':218 'web3':155 'x':120 'x-payment':119 'x402':2,19,46,74,126 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':45","prices":[{"id":"6d7802fa-6617-4e47-b444-772da242b013","listingId":"64b2d1a9-4e52-4b9b-99d5-8fdb8d23c4b7","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/v1/benefits/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:51.140Z"}],"sources":[{"listingId":"64b2d1a9-4e52-4b9b-99d5-8fdb8d23c4b7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/73","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:51.140Z","lastSeenAt":"2026-04-22T05:31:54.495Z"}],"details":{"listingId":"64b2d1a9-4e52-4b9b-99d5-8fdb8d23c4b7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/73 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/benefits/73"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/benefits/73"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The 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 resource without requiring API key registration","Agent-driven pay-per-call workflows settled in USDC on Base","Exploring x402 protocol payment flows for micro-transactions"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents that need keyless, pay-as-you-go API access on Base","Low-cost per-request API consumption without subscriptions"],"notFor":["Users who need documented request/response schemas before integrating","High-volume use cases where per-request pricing may add up without bulk discounts","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.766Z"},"updatedAt":"2026-04-22T05:31:54.495Z"}}