{"id":"fb7cccbf-6ec0-4911-a2e6-da6b671fa203","shortId":"YJAnzv","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 exposes 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, settled in USDC on the Base network via the x402 payment protocol.\n\nThe specific endpoint at `/api/v1/inbox/36` is listed as \"Premium API Access\" and returns a valid 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the `exact` scheme with a 300-second timeout. No API keys or rate limits are advertised; access is gated purely by per-request micropayment.\n\nDocumentation is minimal — the landing page lists available endpoints and pricing, but there is no OpenAPI spec, no request/response schema documentation, and no usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a bare \"Connect wallet\" prompt with no additional content. The exact functionality behind the `/api/v1/inbox/36` path is unclear; it may be a generic message inbox or a catch-all premium endpoint. Without further documentation, callers should experiment cautiously.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["llm","data","finance","geo"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","pay-per-call API","USDC API","Base network API","cheap API calls"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The purpose of /api/v1/inbox/36 ('Premium API Access') is not explained anywhere","All sub-pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no content","Cannot verify what data or functionality is actually returned by this endpoint","The broad catalog of claimed endpoints (AI, finance, data, utils) is unverifiable without docs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/36","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/36","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 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response documentation, no examples, and the specific purpose of /api/v1/inbox/36 is undocumented. The landing page lists many endpoints but provides no detail on inputs or 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'/api/v1/inbox/36':114,222 '/pricing':201 '/readme':203 '/request':19,38 '0.02':18,37,95,136 '000':131 '20':130 '300':154 '402':125 '6':141 'Base network API' 'USDC API' 'access':120,165 'across':54 'addit':215 'advertis':164 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,119,158 'avail':181 'bare':209 'base':8,27,103,132,144 'behind':220 'broad':50 'call':4,23 'caller':243 'catalog':51 'catch':236 'catch-al':235 'categori':56 'cautious':246 'challeng':126 'cheap API calls' 'classif':71 'classification' 'connect':210 'content':216 'convers':88 'conversion' 'crypto-quotes' 'data':11,30,57,61 'data-analytics' 'decim':142 'document':174,194,242 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,112,182,239 'estim':82 'exact':150,218 'exampl':198 'exchang':77 'experi':245 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':219 'gas':81 'gas-estimates' 'gate':167 'generat':89 'generic':230 'geocod':86 'geocoding' 'inbox':232 'infrastructur':84 'insight':63 'key':159 'land':178 'learn':66 'limit':162 'list':116,180 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':65 'made':147 'may':227 'messag':231 'metric':59 'micropay':173 'minim':176 'network':104 'offer':10,29 'openapi':189 'page':179,204 'path':223 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payment':108,145 'per':3,22,96,171 'per-request':170 'platform':6,25,46 'premium':118,238 'price':75,93,184 'prompt':212 'protocol':109 'pure':168 'quot':80 'rate':78,161 'report':60 'request':97,127,172 'request/response':192 'resolv':206 'return':122 'schema':193 'scheme':151 'second':155 'sentiment':67 'sentiment-analysis' 'settl':98 'sinc':138 'spec':190 'specif':111 'summar':70 'text':69 'text-summarization' 'timeout':156 'token':79 'unclear':225 'unit':133 'usag':197 'usd':137 'usdc':9,28,100,135,139 'usdc-base' 'use':140 'util':15,34,85 'valid':87,124 'validation' 'via':105,148 'wallet':211 'web3':74 'without':240 'x402':43,107 'x402 micropayment API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"2dba8396-6283-42e4-b722-fc36a5fcf66a","listingId":"fb7cccbf-6ec0-4911-a2e6-da6b671fa203","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/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:22.106Z"}],"sources":[{"listingId":"fb7cccbf-6ec0-4911-a2e6-da6b671fa203","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/36","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:22.106Z","lastSeenAt":"2026-04-22T10:32:52.012Z"}],"details":{"listingId":"fb7cccbf-6ec0-4911-a2e6-da6b671fa203","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/36 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/inbox/36","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/36"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/36"}],"useCases":["Running sentiment analysis or text summarization without managing API keys","Fetching real-time crypto token quotes or gas estimates via micropayment","Geocoding addresses or validating data with per-request USDC payments","Generating text embeddings on demand without subscription commitments","Accessing analytics metrics and reports with zero upfront cost"],"bestFor":["Agents or bots that need keyless, pay-as-you-go API access","Developers prototyping with low-cost AI and data endpoints","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime","Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:07.923Z"},"updatedAt":"2026-04-22T10:32:52.012Z"}}