{"id":"42114877-a1fb-4732-bf82-2f5d20a8d533","shortId":"zNr2f8","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 marketplace 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, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/messages/112` is listed as \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x8335…2913, which is USDC on Base with 6 decimals), equating to $0.02 per call. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are required. The endpoint accepts HTTP POST requests and returns application/json.\n\nNote that the specific functionality behind `/api/v1/messages/112` is not documented beyond the generic \"Premium API Access\" label. The site's /api, /pricing, and /README pages all resolve to a minimal \"Connect wallet\" prompt with no additional documentation or schema details. Without an OpenAPI spec, request/response examples, or detailed docs, the exact input parameters and output format for this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","json-response","no-api-key","no-rate-limit"],"categories":["api-marketplace","general"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The exact functionality of /api/v1/messages/112 ('Premium API Access') is not described anywhere","Site documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no content","Request and response formats are completely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/112","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/112","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), but there is no OpenAPI spec, no request/response schema, no documentation beyond a generic label, and the /api, /pricing, and /README pages are empty. The specific purpose of /api/v1/messages/112 is 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'/api/v1/messages/112':112,180 '/pricing':195 '/readme':197 '/request':19,38 '0.02':18,37,95,145 '000':127 '0x8335':133 '20':126 '2913':134 '6':141 'accept':167 'access':118,189 'across':54 'addit':209 'advertis':122 'ai':12,31,64 'analysi':68 'analyt':58 'api':5,24,45,117,157,188 'application/json':173 'asset':132 'base':8,27,103,128,139 'base network api' 'behind':179 'beyond':184 'broad':50 'call':4,23,147 'categori':56 'challeng':121 'classif':71 'connect':204 'convers':88 'data':11,30,57,61 'decim':142 'detail':213,221 'doc':222 'document':183,210 'embed':72 'enabl':44 'endpoint':16,35,53,91,111,166,232 'equat':143 'estim':82 'exact':154,224 'exampl':219 'exchang':77 'export':62 'expos':48 'feed':76 'financ':13,32,73 'format':229 'four':55 'function':178 'gas':81 'generat':89 'generic':186 'geocod':86 'http':168 'http-post' 'infrastructur':84 'input':225 'insight':63 'json-response' 'key':158 'label':190 'learn':66 'limit':162 'list':114 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':150 'marketplac':46 'maxamountrequir':124 'metric':59 'micropayment api' 'minim':203 'network':104 'no-api-key' 'no-rate-limit' 'note':174 'offer':10,29 'openapi':216 'output':228 'page':198 'paramet':226 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':148 'per':3,22,96,146 'platform':6,25 'post':169 'premium':116,187 'premium api access' 'price':75,93 'prompt':206 'protocol':108 'quot':80 'rate':78,161 'remain':233 'report':60 'request':97,170 'request/response':218 'requir':164 'resolv':200 'return':172 'schema':212 'scheme':155 'sentiment':67 'set':51 'settl':98 'site':192 'spec':217 'specif':110,177 'subscript':159 'summar':70 'text':69 'token':79 'unit':129 'unknown':234 'usdc':9,28,100,131,137 'usdc api' 'usdc-base' 'util':15,34,85 'valid':87 'via':105,151 'wallet':205 'web3':74 'without':214 'x402':43,107,120,153 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"5a284499-13e1-49e2-8932-16ce2ae36e38","listingId":"42114877-a1fb-4732-bf82-2f5d20a8d533","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/112","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.798Z"}],"sources":[{"listingId":"42114877-a1fb-4732-bf82-2f5d20a8d533","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/112","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.798Z","lastSeenAt":"2026-04-22T02:32:05.870Z"}],"details":{"listingId":"42114877-a1fb-4732-bf82-2f5d20a8d533","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/112 \\\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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/112"},{"claim":"Endpoint described as 'Premium API Access' accepting POST with application/json mime type","source_url":"https://lowpaymentfee.com/api/v1/messages/112"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without managing API keys or subscriptions","Programmatic access to utility/data endpoints with per-call USDC micropayments","Testing x402 payment flows on the Base network"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with x402 payment capability on Base","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users needing detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who need bulk pricing or SLAs","Anyone without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:02.131Z"},"updatedAt":"2026-04-22T02:32:05.870Z"}}