{"id":"8a2b7335-274a-4fc3-a6fb-4d7af4dd3cc9","shortId":"Cy4WpP","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 suite 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.\n\nThe specific endpoint `/api/v1/messages/173` is listed as \"Premium API Access\" and its 402 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 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\nDocumentation is minimal — the site's 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. It is unclear what the `/api/v1/messages/173` endpoint specifically returns, as no schema or description beyond \"Premium API Access\" is provided.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","json-response","no-api-key","no-rate-limit"],"categories":["general","api-platform"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No documentation exists for the /api/v1/messages/173 endpoint — its purpose and expected input/output are unknown.","The /api, /pricing, and /README pages return only a 'Connect wallet' prompt with no useful content.","No OpenAPI spec, request schema, or response schema is available for any endpoint on this platform.","The endpoint name 'Premium API Access' is generic and does not describe functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/173","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/173","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 for what /api/v1/messages/173 actually does, no request/response schemas, and no examples. The site's ancillary pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/messages/173':112,218 '/pricing':198 '/readme':200 '/request':19,38 '0.02':18,37,95,138 '000':128 '0x8335':133 '20':127 '402':121 '6':142 'accept':166 'access':118,230 'across':54 'addit':211 'advertis':123 'ai':12,31,64 'analysi':68 'analyt':58 'api':5,24,45,117,154,229 'application/json':172 'avail':182 'base':8,27,103,129,135 'base network api' 'beyond':227 'broad':50 'call':4,23 'categori':56 'challeng':122 'classif':71 'commit':162 'connect':206 'content':212 'convers':88 'data':11,30,57,61 'decim':143 'descript':192,226 'document':173 'embed':72 'enabl':44 'endpoint':16,35,53,91,111,165,183,219 'equal':137 'estim':82 'exact':150 'exampl':195 'exchang':77 'export':62 'feed':76 'financ':13,32,73 'four':55 'gas':81 'generat':89 'geocod':86 'given':139 'http':167 'http-post' 'infrastructur':84 'insight':63 'json-response' 'key':155 'land':179 'learn':66 'limit':158 'list':114,181 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':65 'made':146 'maxamountrequir':125 'metric':59 'micropayment api' 'minim':175 'network':104 'no-api-key' 'no-rate-limit' 'offer':10,29 'page':180,201 'paramet':191 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payabl':98 'payment':144 'per':3,22,96 'platform':6,25,46 'post':168 'premium':116,228 'price':75,93,185 'prompt':208 'protocol':108 'provid':48,187,232 'quot':80 'rate':78,157 'report':60 'request':97,169 'request/response':189 'requir':163 'resolv':203 'return':171,221 'schema':190,224 'scheme':151 'sentiment':67 'site':177 'specif':110,220 'suit':51 'summar':70 'text':69 'token':79 'unclear':215 'unit':130 'upfront':161 'usag':194 'usdc':9,28,100,132,140 'usdc api' 'usdc-base' 'util':15,34,85 'valid':87 'via':105,147 'wallet':207 'web3':74 'x402':43,107,149 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"4c59c410-6fda-4102-9e87-4e7dc18c6ee4","listingId":"8a2b7335-274a-4fc3-a6fb-4d7af4dd3cc9","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/173","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.143Z"}],"sources":[{"listingId":"8a2b7335-274a-4fc3-a6fb-4d7af4dd3cc9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/173","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.143Z","lastSeenAt":"2026-04-22T02:32:06.389Z"}],"details":{"listingId":"8a2b7335-274a-4fc3-a6fb-4d7af4dd3cc9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/173 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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 402 challenge for /api/v1/messages/173 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/messages/173"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing on-demand API services without subscription or API key management","Making micropayment-gated API calls from autonomous agents on Base","Paying per request for data, AI inference, finance, or utility endpoints"],"bestFor":["Agents or developers who want zero-commitment, pay-as-you-go API access","x402-compatible clients settling in USDC on Base","Low-volume or sporadic API usage where subscriptions are wasteful"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume production workloads requiring bulk pricing or dedicated support","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.455Z"},"updatedAt":"2026-04-22T02:32:06.389Z"}}