{"id":"e6f3666b-e79d-4cc0-bbff-958d8909c3d8","shortId":"xqLt8X","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 hosts a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/inbox/45` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. The platform advertises four categories of APIs: 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 appear to follow the same pricing and payment model.\n\nDocumentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a minimal \"Connect wallet\" prompt with no further technical detail. No OpenAPI schema, request/response examples, or detailed endpoint documentation were found during the crawl. The purpose of the `/api/v1/inbox/45` path specifically is unclear; it does not correspond to any of the named endpoints listed on the homepage.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["llm","finance","geo","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api","lowpaymentfee"],"warnings":["The path /api/v1/inbox/45 does not correspond to any of the named endpoints listed on the homepage — its specific function is unknown.","No API documentation, OpenAPI spec, or request/response examples are available.","The /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no content.","The platform's actual service delivery behind these endpoints cannot be verified from available crawl data."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/45","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/inbox/45","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 lists available API categories with pricing. However, there is no OpenAPI schema, no request/response examples, no documentation beyond the homepage, and the specific /api/v1/inbox/45 path does not match any named endpoint. The crawled /api, /pricing, and /README pages are empty 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'/api/v1/inbox/45':111,230 '/pricing':195 '/readme':197 '/request':19,38 '0.02':18,37,70,133 '000':127 '20':126 '402 payment api' 'access':117 'advertis':138 'ai':12,31,150 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':57 'analysi':154 'analyt':56,144 'api':5,24,45,88,116,142 'appear':177 'attach':99 'base':8,27,78,128,135 'base network api' 'beyond':187 'broad':50 'call':4,23 'caller':97 'categori':140 'challeng':122 'classif':157 'collect':51 'commit':96 'connect':204 'convers':173 'conversion' 'correspond':238 'crawl':225 'crypto-gas-estimates' 'data':11,30,55,60,143,147 'data-analytics' 'detail':211,218 'document':186,220 'embed':158 'enabl':44 'endpoint':16,35,53,66,109,176,219,244 'estim':168 'everi':65 'exampl':216 'exchang':163 'exchange-rates' 'export':148 'feed':162 'financ':13,32,159 'finance-price-feeds' 'finance/web3':59 'follow':179 'found':222 'four':139 'gas':167 'general':62 'generat':174 'geocod':171 'geocoding' 'header':103 'homepag':248 'host':48 'i.e':132 'infer':58 'infrastructure/utilities':170 'insight':149 'key':89 'land':189 'learn':152 'limit':92 'list':113,245 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':151 'metric':145 'micropayment api' 'minim':203 'minimum':95 'model':185 'name':243 'network':79 'offer':10,29 'openapi':213 'page':190,198 'path':231 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':83,102,184 'per':3,22,71 'platform':6,25,46,137 'premium':115 'price':68,161,182 'prompt':206 'protocol':84 'purpos':227 'quot':166 'rate':91,164 'report':146 'request':72,106,123 'request/response':215 'resolv':200 'return':119 'schema':214 'sentiment':153 'servic':64 'settl':73 'simpli':98 'span':54 'spars':192 'specif':108,232 'summar':156 'technic':210 'text':155 'token':165 'unclear':234 'unit':129 'usdc':9,28,75,131 'usdc api' 'usdc-base' 'util':15,34,63 'valid':172 'validation' 'via':80 'wallet':205 'web3':160 'x402':43,82,101,121 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"76b4cb06-92f2-4542-91c2-a95b38d64d12","listingId":"e6f3666b-e79d-4cc0-bbff-958d8909c3d8","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/inbox/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.622Z"}],"sources":[{"listingId":"e6f3666b-e79d-4cc0-bbff-958d8909c3d8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/45","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.622Z","lastSeenAt":"2026-04-22T04:02:46.038Z"}],"details":{"listingId":"e6f3666b-e79d-4cc0-bbff-958d8909c3d8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/45 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/inbox/45 requests up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/inbox/45"}],"useCases":["Querying real-time financial data (prices, exchange rates, gas estimates) with per-call USDC payments","Running AI inference tasks (sentiment analysis, summarization, classification, embeddings) without API key management","Accessing utility services like geocoding and data validation on a pay-as-you-go basis","Exporting analytics data and generating insights via metered API calls"],"bestFor":["Developers who want keyless, pay-per-use API access settled on-chain","AI agents that can autonomously pay for API calls via x402","Projects needing low-friction access to multiple service categories without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads that need guaranteed SLAs and rate-limit transparency","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.118Z"},"updatedAt":"2026-04-22T04:02:46.038Z"}}