{"id":"482507d1-152e-425e-abda-155d460f32d5","shortId":"DSyXh9","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, paid in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint `/api/v1/inbox/82` is listed as \"Premium API Access\" and returns a valid x402 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 to the specified wallet address. The endpoint accepts HTTP POST requests and returns `application/json` responses.\n\nNote that while the landing page advertises many endpoints across multiple categories, the crawled documentation is extremely thin — the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no further detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The actual functionality behind `/api/v1/inbox/82` specifically is unclear; the generic \"Premium API Access\" label does not describe what data or service it provides.","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":["pay per call API","x402 API","USDC API","micropayment API","low fee API","Base network API","serverless API","no-auth API"],"warnings":["The specific functionality of /api/v1/inbox/82 is undocumented — 'Premium API Access' is a generic label with no description of inputs or outputs.","No OpenAPI spec, no request/response examples, and no detailed documentation are available.","The /api, /pricing, and /README pages all returned only 'Connect wallet' with no usable content.","The broad catalog of endpoints listed on the homepage cannot be verified as functional from the crawl data alone."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/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/inbox/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 and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/inbox/82 ('Premium API Access') is entirely opaque. The /api, /pricing, and /README pages are empty behind a wallet-connect 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'/api/v1/inbox/82':122,229 '/pricing':196 '/readme':198 '/request':19,38 '0.02':18,37,95,145 '000':140 '20':139 '402':134 '6':150 'Base network API' 'USDC API' 'accept':168 'access':128,237 'across':54,185 'actual':226 'address':165 'advertis':182 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,110,127,236 'application/json':174 'avail':224 'base':8,27,103,141,153 'behind':228 'broad':50 'call':4,23 'catalog':51 'categori':56,187 'challeng':135 'classif':71 'classification' 'commit':118 'connect':204 'convers':88 'crawl':189 'data':11,30,57,61,243 'data-analytics' 'decim':151 'describ':241 'detail':210 'document':190,219 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,121,167,184 'estim':82 'exact':159 'exampl':223 'exchang':77 'export':62 'expos':48 'extrem':192 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':227 'gas':81 'generat':89 'generic':234 'geocod':86 'geocoding' 'http':169 'infrastructur':84 'insight':63 'key':111 'label':238 'land':180 'learn':66 'limit':114 'list':124 'low fee API' 'lowpaymentfee.com':39 'machin':65 'made':156 'mani':183 'metric':59 'micropayment API' 'multipl':186 'network':104 'no-auth API' 'note':176 'offer':10,29 'openapi':214 'page':181,199 'paid':98 'pay':2,21 'pay per call API' 'pay-per-cal':1,20 'pay-per-request' 'payment':154 'per':3,22,96 'platform':6,25,46 'post':170 'premium':126,235 'price':75,93 'prompt':206 'protocol':108 'provid':247 'quot':80 'rate':78,113 'report':60 'request':97,136,171 'request/response':217 'respons':175 'return':130,173,201 'schema':218 'scheme':160 'sentiment':67 'sentiment-analysis' 'serverless API' 'servic':245 'sinc':147 'spec':215 'specif':120,230 'specifi':163 'summar':70 'text':69 'text-summarization' 'thin':193 'token':79 'unclear':232 'unit':142 'upfront':117 'usag':222 'usd':146 'usdc':9,28,100,144,148 'usdc-base' 'use':149 'util':15,34,85 'utility-apis' 'valid':87,132 'via':105,157 'wallet':164,205 'web3':74 'x402':43,107,133 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"8f65e940-18ad-4993-b1b7-45e2ca1d32a2","listingId":"482507d1-152e-425e-abda-155d460f32d5","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/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":"2026-04-21T18:32:22.222Z"}],"sources":[{"listingId":"482507d1-152e-425e-abda-155d460f32d5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/82","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:22.222Z","lastSeenAt":"2026-04-22T09:02:13.365Z"}],"details":{"listingId":"482507d1-152e-425e-abda-155d460f32d5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/82 \\\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 endpoint returns a valid x402 402 challenge requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/82"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/82"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates via micropayments","Geocoding, data validation, and format conversion as utility calls within automated workflows","Exporting analytics data or generating insights reports on a per-request billing basis"],"bestFor":["AI agents needing keyless, pay-per-call access to diverse utility and AI endpoints","Developers prototyping with low-cost, no-commitment API access on Base","Web3-native applications that prefer on-chain USDC settlement over traditional billing"],"notFor":["High-volume production workloads where per-request pricing at $0.02 adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime commitments","Applications requiring non-USDC or non-Base-network payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:07.678Z"},"updatedAt":"2026-04-22T09:02:13.365Z"}}