{"id":"c97bcc18-1783-4b8b-b025-647fd593f1dd","shortId":"wk6gCc","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of 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 endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint `/api/v1/customers/21` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme by including an X-PAYMENT header. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The exact purpose of the `/api/v1/customers/21` resource is unclear from the available material; it does not appear in the main catalog listing, which focuses on analytics, AI, finance, and utility endpoints.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","validation","conversion"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /api/v1/customers/21 path does not appear in the site's published API catalog — its purpose is unclear","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","No request or response examples are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/21","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/21","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, and the landing page provides a catalog overview with pricing. However, there is no OpenAPI spec, no request/response schemas, no documentation beyond a wallet-connect prompt, and the specific /api/v1/customers/21 endpoint is not described in the catalog. The listing is effectively a stub with pricing 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'/api/v1/customers/21':121,220 '/docs':184 '/pricing':185 '/readme':188 '/request':20,40 '0.02':19,39,97,150 '000':139 '0x8335':144 '20':138 '2913':145 '6':154 'Base network API' 'USDC API' 'accept':173 'access':127 'across':56 'ai':13,33,66,241 'ai-inference' 'analysi':70 'analyt':60,240 'api':5,25,47,109,126 'appear':231 'application/json':178 'avail':214,226 'base':8,28,105,140,147 'broad':52 'call':4,24 'catalog':53,235 'categori':58 'challeng':133 'classif':73 'classification' 'commit':117 'connect':194 'content':200 'convers':90 'conversion' 'data':12,32,59,63 'data-analytics' 'decim':155 'document':179,209 'embed':74 'embeddings' 'enabl':46 'endpoint':17,37,55,93,120,172,245 'equal':149 'estim':84 'exact':162,216 'exampl':213 'exchang':79 'export':64 'extrem':181 'feed':78 'financ':14,34,75,242 'finance-data' 'focus':238 'four':57 'gas':83 'generat':91 'geocod':88 'geocoding' 'given':151 'header':170 'includ':165 'infrastructur':86 'insight':65 'key':110 'learn':68 'limit':113 'list':123,236 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':67 'made':158 'main':234 'materi':227 'maxamountrequir':136 'metric':61 'micropayment API' 'minimum':116 'network':106 'offer':50 'openapi':204 'page':189 'pay':2,22 'pay-per-cal':1,21 'pay-per-call API' 'pay-per-request' 'payabl':100 'payment':156,169 'per':3,23,98 'platform':6,26,48 'post':174 'premium':125 'price':77,95 'prompt':196 'purpos':217 'quot':82 'rate':80,112 'render':191 'report':62 'request':99,175 'request/response':207 'resourc':221 'return':129,177 'schema':208 'scheme':163 'sentiment':69 'sentiment-analysis' 'spars':182 'spec':205 'specif':119 'summar':72 'text':71 'text-summarization' 'token':81 'unclear':223 'unit':141 'usag':212 'usdc':9,29,102,143,152 'usdc-base' 'util':16,36,87,244 'valid':89,131 'validation' 'via':10,30,159 'wallet':195 'web3':76 'x':168 'x-payment':167 'x402':11,31,45,132,161 'x402 API' 'x402-enabled':44 'x402-payment'","prices":[{"id":"cc6dad1d-3755-4e52-b02d-90f76e2bb815","listingId":"c97bcc18-1783-4b8b-b025-647fd593f1dd","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/21","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:41.151Z"}],"sources":[{"listingId":"c97bcc18-1783-4b8b-b025-647fd593f1dd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/21","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:41.151Z","lastSeenAt":"2026-04-23T12:30:48.392Z"}],"details":{"listingId":"c97bcc18-1783-4b8b-b025-647fd593f1dd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/21 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/21"},{"claim":"Catalog includes Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, exchange rates, and gas estimates","Running data analytics queries and exporting reports on a per-request payment basis","Geocoding and data validation as utility microservices"],"bestFor":["Agents or developers who want zero-signup, pay-per-call API access","Use cases requiring low-cost micropayments ($0.02/call) settled on Base L2","Projects already holding USDC on Base that need quick API integrations"],"notFor":["Users without a Base-compatible wallet or USDC holdings","Applications requiring detailed API documentation, SDKs, or guaranteed SLAs","High-volume use cases where subscription pricing would be more economical"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.097Z"},"updatedAt":"2026-04-23T12:30:48.392Z"}}