{"id":"0abcdd69-eb69-469e-ae50-b1409b5c26e1","shortId":"3nQq9K","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/messages/82` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys or accounts are required — callers authenticate and pay via the x402 protocol's `X-PAYMENT` header.\n\nThe platform advertises four categories of endpoints: 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 listed endpoints share the same $0.02/request pricing with no rate limits or minimum commitments.\n\nThe specific `/api/v1/messages/82` endpoint's purpose is not clearly documented beyond the generic \"Premium API Access\" label. It accepts HTTP POST requests and returns `application/json`. The payment is directed to wallet `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The x402 challenge confirms the endpoint is live and responding correctly.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","http-post"],"categories":["api-platform","general"],"synonyms":["low payment fee","micropayment API","x402 API","pay per call API","USDC API","Base network API","lowpaymentfee"],"warnings":["The specific purpose of /api/v1/messages/82 ('Premium API Access') is undocumented — it is unclear what data or functionality it provides.","No OpenAPI spec, request schema, or response schema is available.","Documentation pages (/api, /pricing, /README) returned no useful content beyond 'Connect wallet'.","The broad catalog of endpoints listed on the homepage could not be individually verified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/82","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/messages/82","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and no documentation explaining what /api/v1/messages/82 actually does. The crawled pages beyond the homepage returned only 'Connect wallet' with no useful 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'/request':19,38,159 '0.02':18,37,80,158 '000':84 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':199 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':202 '20':83 '6':90 'Base network API' 'USDC API' 'accept':186 'access':75,183 'account':96 'advertis':114 'ai':12,31,126 'analysi':130 'analyt':120 'api':5,24,45,74,93,182 'application/json':192 'authent':100 'base':8,27,63,85,204 'beyond':178 'broad':50 'call':4,23,82 'caller':99 'catalog':51 'categori':116 'challeng':207 'classif':133 'clear':176 'commit':167 'confirm':208 'convers':150 'correct':215 'cost':77 'data':11,30,119,123 'decim':91 'direct':196 'document':177 'embed':134 'enabl':44 'endpoint':16,35,57,67,118,154,171,210 'estim':144 'exchang':139 'export':124 'feed':138 'financ':13,32,135 'four':115 'gas':143 'generat':151 'generic':180 'geocod':148 'header':111 'http':187 'http-post' 'infrastructur':146 'insight':125 'json-api' 'key':94 'label':184 'learn':128 'limit':164 'list':71,153 'live':212 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':127 'metric':121 'micropayment API' 'minimum':166 'network':64 'no-api-key' 'offer':10,29 'pay':2,21,54,102 'pay per call API' 'pay-per-cal':1,20 'pay-per-request':53 'payment':110,194 'per':3,22,55,81 'platform':6,25,46,113 'post':188 'premium':73,181 'price':137,160 'protocol':106 'provid':48 'purpos':173 'quot':142 'rate':140,163 'report':122 'request':56,189 'requir':98 'respond':214 'return':191 'sentiment':129 'settl':58 'share':155 'specif':66,169 'summar':132 'text':131 'token':141 'unit':86 'usdc':9,28,60,88,201 'usdc-base' 'use':200 'util':15,34,147 'valid':149 'via':103 'wallet':198 'web3':136 'x':109 'x-payment':108 'x402':43,105,206 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"22119d80-1865-4329-b56b-aff92a386ddf","listingId":"0abcdd69-eb69-469e-ae50-b1409b5c26e1","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/messages/82","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.147Z"}],"sources":[{"listingId":"0abcdd69-eb69-469e-ae50-b1409b5c26e1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/82","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.147Z","lastSeenAt":"2026-04-22T02:32:08.205Z"}],"details":{"listingId":"0abcdd69-eb69-469e-ae50-b1409b5c26e1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/82 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/82"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/82"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API content with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Testing x402 protocol integrations with a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents needing frictionless pay-per-call API access without credentials","Low-volume consumers who want no subscription or commitment"],"notFor":["Users who need detailed documentation or OpenAPI schemas before integrating","High-volume production workloads where $0.02/request adds up significantly","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.937Z"},"updatedAt":"2026-04-22T02:32:08.205Z"}}