{"id":"4ba191af-f0af-4080-aa2e-46a196d74d6a","shortId":"2JGgsj","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, payable in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/messages/18` is listed under the title \"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. The endpoint accepts HTTP POST requests and returns application/json. No API keys or rate limits are advertised; access is gated entirely by the x402 payment header.\n\nDocumentation is minimal — the landing page lists available endpoints and pricing but provides no request/response schemas, parameter descriptions, or usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a \"Connect wallet\" prompt with no additional content. Because of this, the actual functionality behind `/api/v1/messages/18` is unclear; the generic \"Premium API Access\" label does not describe what the endpoint does or what parameters it expects.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","json-response","no-api-key","no-rate-limit"],"categories":["api-platform","misc"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","base usdc api","lowpaymentfee"],"warnings":["No documentation available — /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","The purpose of /api/v1/messages/18 is unknown; 'Premium API Access' is a generic label with no functional description.","No OpenAPI spec, no request parameters, and no response schema are provided.","Cannot verify what data or service this specific endpoint returns."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/18","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/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and no description of what '/api/v1/messages/18' actually does. The generic 'Premium API Access' label is uninformative. Effectively a stub 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'/api/v1/messages/18':116,220 '/pricing':198 '/readme':200 '/request':19,38 '0.02':18,37,99,143 '000':133 '0x8335':138 '20':132 '6':147 'accept':151 'access':124,166,227 'across':58 'actual':217 'addit':211 'advertis':128,165 'ai':12,31,68 'analysi':72 'analyt':62 'api':5,24,45,123,159,226 'application/json':157 'avail':182 'base':8,27,107,134,140 'base usdc api' 'behind':219 'broad':50 'call':4,23 'catalog':51 'categori':60 'challeng':127 'classif':75 'connect':206 'content':212 'convers':92 'data':11,30,61,65 'decim':148 'describ':231 'descript':192 'document':175 'embed':76 'enabl':44 'endpoint':16,35,57,95,115,150,183,234 'entir':169 'equal':142 'estim':86 'exampl':195 'exchang':81 'expect':240 'export':66 'feed':80 'financ':13,32,77 'four':59 'function':218 'gas':85 'gate':168 'generat':93 'generic':224 'geocod':90 'given':144 'header':174 'http':152 'http-post' 'infrastructur':88 'insight':67 'json-response' 'key':160 'label':228 'land':179 'learn':70 'limit':163 'list':118,181 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'maxamountrequir':130 'metric':63 'micropayment api' 'minim':177 'network':108 'no-api-key' 'no-rate-limit' 'offer':10,29 'page':180,201 'paramet':191,238 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payabl':102 'payment':173 'per':3,22,55,100 'platform':6,25,46 'post':153 'premium':122,225 'price':79,97,185 'prompt':208 'protocol':112 'provid':48,187 'quot':84 'rate':82,162 'report':64 'request':56,101,154 'request/response':189 'resolv':203 'return':156 'schema':190 'sentiment':71 'specif':114 'summar':74 'text':73 'titl':121 'token':83 'unclear':222 'unit':135 'usag':194 'usdc':9,28,104,137,145 'usdc-base' 'util':15,34,89 'valid':91 'via':109 'wallet':207 'web3':78 'x402':43,111,126,172 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"5fc7aa6b-4569-4550-8990-4139002e247d","listingId":"4ba191af-f0af-4080-aa2e-46a196d74d6a","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/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.664Z"}],"sources":[{"listingId":"4ba191af-f0af-4080-aa2e-46a196d74d6a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/18","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.664Z","lastSeenAt":"2026-04-22T02:32:07.474Z"}],"details":{"listingId":"4ba191af-f0af-4080-aa2e-46a196d74d6a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/18 \\\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 are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/messages/18 shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/messages/18"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing pay-per-call API services without API key registration","Making micro-payments for individual API requests using USDC on Base","Agent-driven programmatic access to utility or data endpoints"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto-native micropayment billing over subscriptions"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.667Z"},"updatedAt":"2026-04-22T02:32:07.474Z"}}