{"id":"759eed9c-2420-4abd-b44d-0a519af35eec","shortId":"NphA9S","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, 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 protocol.\n\nThe specific endpoint at `/api/v1/messages/115` is listed as \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme with a 300-second timeout. No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header to each POST request.\n\nDocumentation is minimal: the landing page lists available endpoints and pricing, but the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The purpose of the `/messages/115` endpoint specifically is unclear — it could be a messaging or content endpoint, but no description beyond \"Premium API Access\" is provided.","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","data","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","cheap api","402 payment api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose of /api/v1/messages/115 ('Premium API Access') is undocumented — unclear what it returns","All non-root pages (/api, /pricing, /README) returned only a wallet-connect prompt with no content","No request or response examples available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/115","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/115","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). However, there is no OpenAPI spec, no request/response schema, no documentation for the specific /messages/115 endpoint, and the crawled /api, /pricing, and /README pages are empty beyond a wallet-connect prompt. The purpose of this particular endpoint is 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'/api/v1/messages/115':112 '/messages/115':222 '/pricing':189 '/readme':191 '/request':19,38 '0.02':18,37,94,137 '000':127 '0x8335':132 '20':126 '300':152 '402 payment api' '6':141 'access':118,241 'across':54 'advertis':122,162 'ai':12,31,63 'ai-inference' 'analysi':67 'analyt':58 'api':5,24,45,117,156,240 'attach':165 'avail':182 'base':8,27,102,128,134 'base network api' 'beyond':238 'broad':50 'call':4,23 'caller':163 'catalog':51 'categori':56 'challeng':121 'cheap api' 'classif':70 'classification' 'connect':199 'content':204,233 'convers':87 'could':228 'data':11,30,57 'data-analytics' 'decim':142 'descript':237 'document':175,213 'embed':71 'embeddings' 'enabl':44 'endpoint':16,35,53,90,110,183,223,234 'equal':136 'estim':81 'exact':148 'exampl':217 'exchang':76 'export':61 'expos':48 'feed':75 'financ':13,32,72 'finance-data' 'four':55 'gas':80 'generat':88 'geocod':85 'geocoding' 'given':138 'header':170 'infrastructur':83 'insight':62 'key':157 'land':179 'learn':65 'limit':160 'list':114,181 'low payment fee' 'lowpaymentfee.com':39 'machin':64 'made':145 'maxamountrequir':124 'messag':231 'metric':59 'micropayment api' 'minim':177 'network':103 'offer':10,29 'openapi':208 'page':180,192 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':143,169 'per':3,22,95 'platform':6,25,46 'post':173 'premium':116,239 'price':74,92,185 'prompt':200 'protocol':107 'provid':243 'purpos':219 'quot':79 'rate':77,159 'report':60 'request':96,174 'request/response':211 'resolv':194 'schema':212 'scheme':149 'second':153 'sentiment':66 'sentiment-analysis' 'settl':97 'simpli':164 'spec':209 'specif':109,224 'summar':69 'text':68 'text-summarization' 'timeout':154 'token':78 'unclear':226 'unit':129 'usag':216 'usdc':9,28,99,131,139 'usdc api' 'usdc-base' 'util':15,34,84 'utility-apis' 'valid':86 'via':104,146 'wallet':198 'wallet-connect':197 'web3':73 'x':168 'x-payment':167 'x402':43,106,120 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"b1770a77-4066-4070-ac8e-8a6fc4703aaf","listingId":"759eed9c-2420-4abd-b44d-0a519af35eec","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/115","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.851Z"}],"sources":[{"listingId":"759eed9c-2420-4abd-b44d-0a519af35eec","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/115","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.851Z","lastSeenAt":"2026-04-22T07:02:09.498Z"}],"details":{"listingId":"759eed9c-2420-4abd-b44d-0a519af35eec","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/115 \\\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 API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/messages/115"},{"claim":"Available endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations such as geocoding, validation, and data conversion with instant pay-per-use billing"],"bestFor":["Agents or bots that need instant, keyless API access via crypto micropayments","Developers prototyping with low-cost, no-commitment API calls","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads needing SLAs, documentation, or guaranteed uptime","Users without a Base-compatible USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.924Z"},"updatedAt":"2026-04-22T07:02:09.498Z"}}