{"id":"67314b3e-76a8-408f-9c37-417711a95552","shortId":"bdxFgn","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 set 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, paid in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/inbox/55` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02). Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts HTTP POST and returns application/json.\n\nDocumentation is minimal — the landing page lists available endpoints and pricing but provides no request/response schemas, parameter descriptions, or usage examples. The /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no additional content. Because of this, the actual functionality behind `/api/v1/inbox/55` (labeled generically as \"Premium API Access\") is unclear and cannot be confidently mapped to any of the listed API categories.","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":["llm","finance","geo","utility"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","cheap api","402 payment api"],"warnings":["The specific endpoint /api/v1/inbox/55 is labeled generically as 'Premium API Access' with no description of what it actually does or what parameters it accepts.","No API documentation, request schemas, or response examples are available anywhere on the site.","The /pricing, /api, and /README pages contain no useful content beyond a 'Connect wallet' prompt.","Cannot verify what data or service is returned after payment — use at your own risk."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/55","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/55","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 schema, no request/response documentation, no examples, and the specific purpose of /api/v1/inbox/55 ('Premium API Access') is undefined. The /pricing, /api, and /README pages are empty beyond a wallet-connect 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'/api/v1/inbox/55':112,213 '/pricing':191 '/readme':193 '/request':19,38 '0.02':18,37,95,139 '000':128 '0x8335':133 '20':127 '2913':134 '402':122 '402 payment api' '6':137 'accept':162 'access':118,219 'across':54 'actual':210 'addit':204 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,117,150,218,232 'application/json':167 'avail':175 'base':8,27,103,129,136 'base network api' 'behind':212 'broad':50 'call':4,23 'cannot':223 'categori':56,233 'challeng':123 'cheap api' 'classif':71 'classification' 'commit':158 'confid':225 'connect':199 'content':205 'convers':88 'data':11,30,57,61 'data-analytics' 'decim':138 'descript':185 'document':168 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,161,176 'estim':82 'exact':146 'exampl':188 'exchang':77 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':211 'gas':81 'generat':89 'generic':215 'geocod':86 'geocoding' 'http':163 'infrastructur':84 'insight':63 'key':151 'label':214 'land':172 'learn':66 'limit':154 'list':114,174,231 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':142 'map':226 'metric':59 'micropayment api' 'minim':170 'network':104 'offer':10,29 'page':173,194 'paid':98 'paramet':184 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':140 'per':3,22,96 'platform':6,25,46 'post':164 'premium':116,217 'price':75,93,178 'prompt':201 'protocol':108 'provid':180 'quot':80 'rate':78,153 'report':60 'request':97,124 'request/response':182 'requir':159 'resolv':196 'return':120,166 'schema':183 'scheme':147 'sentiment':67 'sentiment-analysis' 'set':51 'specif':110 'summar':70 'text':69 'text-summarization' 'token':79 'unclear':221 'unit':130 'upfront':157 'usag':187 'usdc':9,28,100,132 'usdc api' 'usdc-base' 'util':15,34,85 'utility-apis' 'valid':87 'via':105,143 'wallet':200 'web3':74 'x402':43,107,145 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"bc7676cd-2ffd-40f6-be8b-1ad677606db9","listingId":"67314b3e-76a8-408f-9c37-417711a95552","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/55","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:21.938Z"}],"sources":[{"listingId":"67314b3e-76a8-408f-9c37-417711a95552","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/55","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:21.938Z","lastSeenAt":"2026-04-22T10:02:57.308Z"}],"details":{"listingId":"67314b3e-76a8-408f-9c37-417711a95552","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/55 \\\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 Base network.","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":"The x402 challenge for /api/v1/inbox/55 requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/inbox/55"}],"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 utility operations like geocoding, validation, and data conversion with micropayments"],"bestFor":["Agents or developers who want zero-signup, pay-per-use API access","Crypto-native applications that can settle USDC on Base","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume production workloads needing SLAs or guaranteed uptime documentation","Users who need detailed API documentation, request schemas, or response examples before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.139Z"},"updatedAt":"2026-04-22T10:02:57.308Z"}}