{"id":"9fe4c6d7-530c-4fd8-8d93-b5df8b84a831","shortId":"GadUeU","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 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, paid in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/inbox/81` is listed as \"Premium API Access\" and its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made per-call with no API keys, no rate limits, and no minimum commitments required. The x402 challenge uses the \"exact\" scheme with a 300-second timeout.\n\nNote that while the landing page lists many endpoints across multiple categories, the specific function of `/api/v1/inbox/81` is not clearly documented beyond the generic label \"Premium API Access.\" The crawled docs pages (/api, /pricing, /README) all returned only a \"Connect wallet\" prompt with no additional documentation. Without further documentation or an OpenAPI spec, the exact input/output schema for this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","micropayment API","x402 API","pay-per-call API","USDC API","Base network API","cheap API access"],"warnings":["The specific function of /api/v1/inbox/81 ('Premium API Access') is not documented; its actual behavior is unknown.","No OpenAPI spec or detailed API documentation is available; /api, /pricing, and /README pages all return only a wallet-connect prompt.","The broad catalog of endpoints listed on the landing page cannot be independently verified for functionality.","Input and output schemas are entirely unknown for this endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/81","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/81","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 spec, no documentation beyond the landing page listing, and the specific purpose of /api/v1/inbox/81 is undocumented. Input/output schemas are 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'/api/v1/inbox/81':116,190 '/pricing':207 '/readme':208 '/request':19,38 '0.02':18,37,99,143 '000':132 '0x8335':137 '20':131 '2913':138 '300':171 'Base network API' 'USDC API' 'access':122,201 'across':58,183 'addit':218 'advertis':127 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,121,152,200 'base':8,27,107,133,140 'beyond':195 'broad':50 'call':4,23,149 'catalog':51 'categori':60,185 'challeng':126,164 'cheap API access' 'classif':75 'classification' 'clear':193 'commit':160 'connect':213 'convers':92 'crawl':203 'data':11,30,61,65 'data-analytics' 'doc':204 'document':194,219,222 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,115,182,233 'equal':142 'estim':86 'exact':167,228 'exchang':81 'export':66 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'function':188 'gas':85 'generat':93 'generic':197 'geocod':90 'geocoding' 'infrastructur':88 'input/output':229 'insight':67 'key':153 'label':198 'land':178 'learn':70 'limit':156 'list':118,180 'low payment fee' 'lowpaymentfee.com':39 'machin':69 'made':146 'mani':181 'maxamountrequir':129 'metric':63 'micropayment API' 'minimum':159 'multipl':184 'network':108 'note':174 'offer':10,29 'openapi':225 'page':179,205 'paid':102 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':144 'per':3,22,55,100,148 'per-cal':147 'platform':6,25,46 'premium':120,199 'price':79,97 'prompt':215 'protocol':112 'provid':48 'quot':84 'rate':82,155 'report':64 'request':56,101 'requir':161 'return':210 'schema':230 'scheme':168 'second':172 'sentiment':71 'sentiment-analysis' 'spec':226 'specif':114,187 'summar':74 'text':73 'text-summarization' 'timeout':173 'token':83 'unit':134 'unknown':235 'usdc':9,28,104,136 'usdc-base' 'use':165 'util':15,34,89 'utility-apis' 'valid':91 'via':109 'wallet':214 'web3':78 'without':220 'x402':43,111,125,163 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"8c308c0c-de4d-48fa-9333-779d1b7416b3","listingId":"9fe4c6d7-530c-4fd8-8d93-b5df8b84a831","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:22.168Z"}],"sources":[{"listingId":"9fe4c6d7-530c-4fd8-8d93-b5df8b84a831","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:22.168Z","lastSeenAt":"2026-04-22T10:02:57.608Z"}],"details":{"listingId":"9fe4c6d7-530c-4fd8-8d93-b5df8b84a831","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/81 \\\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":"The landing page lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $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 x402 challenge for /api/v1/inbox/81 shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/inbox/81"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with per-request billing","Using utility services like geocoding, validation, and conversion without subscriptions"],"bestFor":["Agents or developers who want instant, keyless API access with crypto micropayments","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions","Web3-native applications that already hold USDC on Base"],"notFor":["High-volume production workloads where bulk pricing or rate guarantees are needed","Users who cannot pay in USDC on the Base network","Applications requiring detailed SLAs, uptime guarantees, or extensive documentation"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:07.77Z"},"updatedAt":"2026-04-22T10:02:57.608Z"}}