{"id":"dce22efd-e801-4a6c-acd5-c7db5568a3d4","shortId":"GgWdDX","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, payable in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/messages/135` is described as \"Premium API Access\" in the x402 challenge. Its maxAmountRequired is 20,000 base units of USDC (6 decimals), which equals $0.02. The endpoint accepts HTTP POST requests and returns application/json. Payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the \"exact\" payment scheme with a 300-second timeout.\n\nNote that while the landing page lists many endpoints, the specific purpose of `/api/v1/messages/135` is not clearly documented beyond the generic \"Premium API Access\" label. No OpenAPI schema, request/response examples, or detailed documentation were found during crawling — the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt. The platform's actual data sources, model providers, and response formats remain unspecified.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["multi-purpose","llm","finance","geo"],"synonyms":["low payment fee API","x402 API platform","pay-per-call API","USDC API","Base network API","micropayment API","cheap API access"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific function of /api/v1/messages/135 is undocumented beyond the generic 'Premium API Access' label","Crawled /api, /pricing, and /README pages returned no useful content (only 'Connect wallet')","No request or response examples available — actual payload format is unknown","Platform legitimacy and data source provenance are unverifiable from available materials"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/135","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/135","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 schema, no request/response examples, and no documentation beyond the landing page listing. The specific purpose of /api/v1/messages/135 is unclear — it could be a messaging endpoint or a generic placeholder. Most crawled pages returned only 'Connect wallet' with no useful 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'/api/v1/messages/135':123,189 '/pricing':215 '/readme':217 '/request':19,38 '0.02':18,37,95,147 '000':138 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':165 '20':137 '300':173 '6':143 'Base network API' 'USDC API' 'accept':150 'access':129,199 'across':54 'actual':229 'address':164 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,110,128,198 'application/json':156 'base':8,27,103,139 'beyond':194 'broad':50 'call':4,23 'catalog':51 'categori':56 'chain':162 'challeng':133 'cheap API access' 'classif':71 'classification' 'clear':192 'commit':118 'connect':223 'convers':88 'crawl':212 'data':11,30,57,61,230 'data-analytics' 'decim':144 'describ':125 'detail':207 'document':193,208 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,121,149,184 'equal':146 'estim':82 'exact':168 'exampl':205 'exchang':77 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'format':236 'found':210 'four':55 'gas':81 'generat':89 'generic':196 'geocod':86 'geocoding' 'http':151 'infrastructur':84 'insight':63 'key':111 'label':200 'land':180 'learn':66 'limit':114 'list':182 'low payment fee API' 'lowpaymentfee.com':39 'machin':65 'mani':183 'maxamountrequir':135 'metric':59 'micropayment API' 'model':232 'network':104 'note':176 'offer':10,29 'on-chain':160 'openapi':202 'page':181,218 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payabl':98 'payment':157,169 'per':3,22,96 'platform':6,25,46,227 'post':152 'premium':127,197 'price':75,93 'prompt':225 'protocol':108 'provid':233 'purpos':187 'quot':80 'rate':78,113 'remain':237 'report':60 'request':97,153 'request/response':204 'respons':235 'return':155,220 'schema':203 'scheme':170 'second':174 'sentiment':67 'sentiment-analysis' 'settl':159 'sourc':231 'specif':120,186 'summar':70 'text':69 'text-summarization' 'timeout':175 'token':79 'unit':140 'unspecifi':238 'upfront':117 'usdc':9,28,100,142 'usdc-base-network' 'use':166 'util':15,34,85 'utility-apis' 'valid':87 'via':105 'wallet':224 'web3':74 'x402':43,107,132 'x402 API platform' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e461ec56-78c0-4666-9389-36136b54f712","listingId":"dce22efd-e801-4a6c-acd5-c7db5568a3d4","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/135","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.324Z"}],"sources":[{"listingId":"dce22efd-e801-4a6c-acd5-c7db5568a3d4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/135","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.324Z","lastSeenAt":"2026-04-22T05:32:16.229Z"}],"details":{"listingId":"dce22efd-e801-4a6c-acd5-c7db5568a3d4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/135 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\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 x402 challenge for /api/v1/messages/135 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/135"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"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","Integrating pay-as-you-go analytics and data export into agent workflows"],"bestFor":["Agents or developers wanting zero-signup, pay-per-call API access","Use cases requiring low-cost micropayment-settled API calls on Base","Prototyping or low-volume workloads where $0.02/request is economical"],"notFor":["High-volume production workloads where per-request crypto settlement overhead matters","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.207Z"},"updatedAt":"2026-04-22T05:32:16.229Z"}}