{"id":"c245c316-8c40-4df9-bbcd-d98e359d33fc","shortId":"CXuwWv","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/130` is listed as \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts HTTP POST requests and returns application/json.\n\nNote that while the landing page lists many endpoints, the specific functionality behind `/api/v1/messages/130` is not documented beyond the generic label \"Premium API Access.\" There is no OpenAPI spec, no request/response schema documentation, and the /api, /pricing, and /README pages all resolve to a minimal \"Connect wallet\" prompt. The platform's actual capabilities behind each endpoint remain unverified.","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 micropayment API","Base network API","lowpaymentfee","low payment fee API","micropayment endpoint"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific functionality of /api/v1/messages/130 ('Premium API Access') is undocumented","All secondary pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no useful content","Request and response formats are entirely unknown — no examples or schemas provided","The breadth of advertised endpoints (AI, finance, data, utilities) is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/130","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/130","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation for what /api/v1/messages/130 actually does, and supporting pages are empty wallet-connect stubs. The endpoint's specific functionality is 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'/api/v1/messages/130':112,183 '/pricing':206 '/readme':208 '/request':19,38 '0.02':18,37,94,135 '000':127 '0x8335':132 '20':126 '6':139 'Base network API' 'USDC micropayment API' 'accept':163 'access':118,193 'across':54 'actual':221 'advertis':122 'ai':12,31,63 'ai-inference' 'analysi':67 'analyt':58 'api':5,24,45,117,151,192 'application/json':169 'base':8,27,102,128 'behind':182,223 'beyond':187 'broad':50 'call':4,23 'capabl':222 'catalog':51 'categori':56 'challeng':121 'classif':70 'commit':159 'connect':215 'convers':87 'data':11,30,57 'data-analytics' 'decim':140 'document':186,202 'embed':71 'enabl':44 'endpoint':16,35,53,90,110,162,178,225 'equal':134 'estim':81 'exact':147 'exchang':76 'export':61 'expos':48 'feed':75 'financ':13,32,72 'finance-data' 'four':55 'function':181 'gas':80 'generat':88 'generic':189 'geocod':85 'given':136 'http':164 'http-post' 'infrastructur':83 'insight':62 'json-response' 'key':152 'label':190 'land':174 'learn':65 'limit':155 'list':114,176 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':64 'made':143 'mani':177 'maxamountrequir':124 'metric':59 'micropayment endpoint' 'minim':214 'network':103 'no-api-key' 'note':170 'offer':10,29 'openapi':197 'page':175,209 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payment':141 'per':3,22,95 'platform':6,25,46,219 'post':165 'premium':116,191 'price':74,92 'prompt':217 'protocol':107 'quot':79 'rate':77,154 'remain':226 'report':60 'request':96,166 'request/response':200 'requir':160 'resolv':211 'return':168 'schema':201 'scheme':148 'sentiment':66 'settl':97 'spec':198 'specif':109,180 'summar':69 'text':68 'token':78 'unit':129 'unverifi':227 'upfront':158 'usdc':9,28,99,131,137 'usdc-base-network' 'util':15,34,84 'utility-services' 'valid':86 'via':104,144 'wallet':216 'web3':73 'x402':43,106,120,146 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"0c430e10-7a49-422d-bf5a-7afdb58b3b96","listingId":"c245c316-8c40-4df9-bbcd-d98e359d33fc","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/130","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.976Z"}],"sources":[{"listingId":"c245c316-8c40-4df9-bbcd-d98e359d33fc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/130","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.976Z","lastSeenAt":"2026-04-22T05:32:15.738Z"}],"details":{"listingId":"c245c316-8c40-4df9-bbcd-d98e359d33fc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/130 \\\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 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","source_url":"https://lowpaymentfee.com/api/v1/messages/130"},{"claim":"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 registration","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations like geocoding or data validation with instant pay-per-use pricing","Integrating pay-as-you-go data analytics into agent workflows"],"bestFor":["AI agents needing keyless, on-demand API access settled in crypto","Developers prototyping with low-cost per-request pricing and no commitments","Web3-native applications that can pay with USDC on Base"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integration","High-volume production workloads where per-request crypto settlement adds overhead","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.777Z"},"updatedAt":"2026-04-22T05:32:15.738Z"}}