{"id":"f94d6ecd-bde5-403f-90ab-088bb86658e1","shortId":"MhRQk6","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/customers/92` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader 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 the same $0.02/request price point.\n\nHowever, the specific endpoint being listed here (`/api/v1/customers/92`) does not clearly map to any of the documented API categories. Its purpose — what data or service it actually returns — is not described in the available documentation. The docs, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. Without a response schema or example output, callers should treat this endpoint as opaque until they can inspect an actual paid response.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The specific endpoint /api/v1/customers/92 is not described in any of the site's documented API categories — its actual function is unknown.","All documentation pages (docs, pricing, README, api) render only 'Connect wallet' with no usable content.","No output schema or example response is available; callers cannot know what they are paying for without making a paid request.","The endpoint path suggests it may return customer-specific data, which could raise privacy or data-handling concerns."],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/92","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/customers/92","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 of what this specific endpoint returns, no response schema, no example payloads, and the docs/pricing/README pages are all empty beyond a wallet-connect prompt. The endpoint path (/api/v1/customers/92) doesn't match any documented category, making its purpose 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'/request':13,28,154 '0.02':12,27,80,153 '000':74 '20':73 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62 'actual':183,228 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':5,20,38,61,84,110,174 'attach':93 'avail':190 'base':8,23,51,75 'broader':106 'call':4,19,82 'caller':91,216 'categori':111,175 'challeng':67 'classif':127 'clear':167 'connect':202 'content':208 'convers':144 'crypto-paid API' 'data':113,117,179 'describ':187 'doc':193 'document':173,191 'embed':128 'endpoint':55,147,160,220 'estim':138 'exampl':214 'exchang':133 'export':118 'feed':132 'financ':129 'gas':137 'generat':145 'geocod':142 'header':98 'howev':157 'i.e':79 'includ':112 'infrastructur':140 'insight':119 'inspect':226 'json-response' 'key':85 'learn':122 'limit':88 'list':58,149,162 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':121 'map':168 'metric':115 'multipl':109 'network':9,24,52 'no-api-key' 'opaqu':222 'output':215 'page':197 'paid':229 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,69,97,103 'per':3,18,36,81 'platform':6,21,39,107 'point':156 'post-method' 'premium':60 'premium API access' 'price':131,155,194 'prompt':204 'proof':104 'protocol':44 'purpos':177 'quot':136 'rate':87,134 'readm':196 'render':199 'report':116 'request':37 'requir':68,90 'respons':211,230 'return':64,184 'schema':212 'sentiment':123 'servic':181 'simpli':92 'specif':54,159 'summar':126 'text':125 'token':135 'treat':218 'unit':76 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':141 'valid':101,143 'via':10,25 'wallet':203 'web3':130 'without':209 'x':96 'x-payment':95 'x402':11,26,43,102 'x402 API' 'x402-payment'","prices":[{"id":"7fbf6547-05d1-4d68-b752-dabcb2ea2560","listingId":"f94d6ecd-bde5-403f-90ab-088bb86658e1","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/customers/92","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:20.131Z"}],"sources":[{"listingId":"f94d6ecd-bde5-403f-90ab-088bb86658e1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/92","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:20.131Z","lastSeenAt":"2026-04-25T07:31:51.611Z"}],"details":{"listingId":"f94d6ecd-bde5-403f-90ab-088bb86658e1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/92 \\\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 of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/customers/92"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/92"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a premium data endpoint with per-call USDC micropayments","Integrating pay-as-you-go API calls into agent workflows without API key management","Testing x402 protocol payment flows on Base network"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or response schemas before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:59.964Z"},"updatedAt":"2026-04-25T07:31:51.611Z"}}