{"id":"10dae702-cfa2-4930-9cfe-e91cf92c35e5","shortId":"Hhk49L","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/messages/111` is listed as \"Premium API Access\" and carries a maximum charge of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). It accepts HTTP POST requests and returns application/json. Payment is made by including an X-PAYMENT header; no API keys or account registration are required. The platform advertises no rate limits and instant access.\n\nDocumentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The exact functionality behind the `/api/v1/messages/111` endpoint is unclear; the generic \"Premium API Access\" label does not describe what data or service it provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post","json-response","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee API","crypto API access"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The exact functionality of /api/v1/messages/111 ('Premium API Access') is not described anywhere in the crawled material","All documentation pages (/api, /pricing, /README) return only a wallet-connect prompt with no content","No request or response examples are available; input format is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/111","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/messages/111","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/messages/111 is undescribed. Effectively a stub 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'/api/v1/messages/111':116,225 '/pricing':186 '/readme':188 '/request':19,38 '0.02':18,37,99,135 '000':130 '20':129 '6':140 'Base network API' 'USDC API' 'accept':143 'access':122,176,233 'account':164 'across':58 'addit':200 'advertis':170 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,121,161,232 'application/json':149 'avail':215 'base':8,27,107,131 'behind':223 'beyond':178 'broad':50 'call':4,23 'carri':124 'catalog':51 'categori':60 'charg':127 'classif':75 'connect':196 'content':201 'convers':92 'crawl':218 'crypto API access' 'data':11,30,61,65,239 'data-analytics' 'decim':141 'describ':237 'document':177,210 'embed':76 'enabl':44 'endpoint':16,35,57,95,115,226 'estim':86 'exact':221 'exampl':214 'exchang':81 'export':66 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'function':222 'gas':85 'generat':93 'generic':230 'geocod':90 'header':159 'http':144 'http-post' 'includ':154 'infrastructur':88 'insight':67 'instant':175 'json-response' 'key':162 'label':234 'land':180 'learn':70 'limit':173 'list':118 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'made':152 'materi':219 'maximum':126 'metric':63 'micropayment API' 'network':108 'no-api-key' 'offer':10,29 'openapi':205 'page':181,189 'paid':102 'pay':2,21,54 'pay per call API' 'pay-per-cal':1,20 'pay-per-request':53 'payment':150,158 'per':3,22,55,100 'platform':6,25,46,169 'post':145 'premium':120,231 'price':79,97 'prompt':197 'protocol':112 'provid':48,243 'quot':84 'rate':82,172 'registr':165 'report':64 'request':56,101,146 'request/response':208 'requir':167 'resolv':191 'return':148 'schema':209 'sentiment':71 'servic':241 'sinc':137 'spars':183 'spec':206 'specif':114 'summar':74 'text':73 'token':83 'unclear':228 'unit':132 'usag':213 'usd':136 'usdc':9,28,104,134,138 'usdc-base-network' 'use':139 'util':15,34,89 'utility-services' 'valid':91 'via':109 'wallet':195 'wallet-connect':194 'web3':78 'x':157 'x-payment':156 'x402':43,111 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"84c2f057-7ab7-4ccd-8ed5-f510723cb7ed","listingId":"10dae702-cfa2-4930-9cfe-e91cf92c35e5","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/messages/111","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.732Z"}],"sources":[{"listingId":"10dae702-cfa2-4930-9cfe-e91cf92c35e5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/111","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.732Z","lastSeenAt":"2026-04-22T05:32:15.410Z"}],"details":{"listingId":"10dae702-cfa2-4930-9cfe-e91cf92c35e5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/111 \\\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 priced at $0.02 per request with no minimums or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Payment in USDC on Base network, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units (USDC, 6 decimals = $0.02)","source_url":"https://lowpaymentfee.com/api/v1/messages/111"},{"claim":"Endpoint accepts HTTP POST and returns application/json","source_url":"https://lowpaymentfee.com/api/v1/messages/111"},{"claim":"Categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without subscription","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates on a per-call basis","Running utility operations like geocoding, validation, and data conversion with no account setup","Integrating pay-per-use data analytics into agent workflows"],"bestFor":["AI agents needing on-demand API access without API key management","Developers who want micropayment-based API consumption on Base/USDC","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume production workloads where per-request pricing adds up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:02.17Z"},"updatedAt":"2026-04-22T05:32:15.410Z"}}