{"id":"3a4c85b8-3fc4-4588-81da-3cfa60dc0a53","shortId":"YQVWRa","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 settled in USDC on the Base network. The specific endpoint at `/api/v1/messages/187` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys or accounts are required; callers authenticate and pay via the x402 payment header protocol.\n\nThe platform advertises four endpoint 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 listed at the same $0.02/request price point with no rate limits or minimum commitments.\n\nThe `/api/v1/messages/187` endpoint specifically accepts HTTP POST requests and returns `application/json`. However, there is no public documentation describing the request body schema, expected parameters, or response format for this particular endpoint. The endpoint is live and returns a valid x402 402 challenge, confirming it is operational. The lack of OpenAPI specs, detailed docs, or example payloads limits what can be confirmed about the actual functionality behind the \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["general","api-platform"],"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 purpose and expected input/output of /api/v1/messages/187 are undocumented","Crawled /api, /pricing, and /README pages returned no meaningful content","Cannot verify what data or service this specific endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/187","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/187","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI schema, no documentation of request/response formats, and the purpose of '/api/v1/messages/187' is unclear beyond the generic 'Premium API Access' label. The crawled pages beyond the landing page returned only 'Connect wallet' with no useful 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'/request':19,38,156 '0.02':18,37,80,155 '000':84 '20':83 '402':206 '6':90 'accept':170 'access':75,235 'account':96 'actual':229 'advertis':111 'ai':12,31,122 'analysi':126 'analyt':116 'api':5,24,45,74,93,234 'application/json':176 'authent':100 'base':8,27,63,85 'base network api' 'behind':231 'bodi':186 'broad':50 'call':4,23,82 'caller':99 'catalog':51 'categori':114 'challeng':207 'classif':129 'commit':165 'confirm':208,226 'convers':146 'cost':77 'data':11,30,115,119 'decim':91 'describ':183 'detail':217 'doc':218 'document':182 'embed':130 'enabl':44 'endpoint':16,35,57,67,113,149,168,196,198 'estim':140 'exampl':220 'exchang':135 'expect':188 'export':120 'feed':134 'financ':13,32,131 'format':192 'four':112 'function':230 'gas':139 'generat':147 'geocod':144 'header':107 'howev':177 'http':171 'http-post' 'infrastructur':142 'insight':121 'json-response' 'key':94 'label':236 'lack':213 'learn':124 'limit':162,222 'list':71,151 'live':200 'low payment fee' 'lowpaymentfee.com':39 'machin':123 'metric':117 'micropayment api' 'minimum':164 'network':64 'no-api-key' 'offer':10,29 'openapi':215 'oper':211 'paramet':189 'particular':195 'pay':2,21,54,102 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payload':221 'payment':106 'per':3,22,55,81 'platform':6,25,46,110 'point':158 'post':172 'premium':73,233 'premium api access' 'price':133,157 'protocol':108 'provid':48 'public':181 'quot':138 'rate':136,161 'report':118 'request':56,173,185 'requir':98 'respons':191 'return':175,202 'schema':187 'sentiment':125 'settl':58 'spec':216 'specif':66,169 'summar':128 'text':127 'token':137 'unit':86 'usdc':9,28,60,88 'usdc api' 'usdc-base-network' 'util':15,34,143 'valid':145,204 'via':103 'web3':132 'x402':43,105,205 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"ec6b7c9a-fd0f-4463-9c58-f62bfcb79da6","listingId":"3a4c85b8-3fc4-4588-81da-3cfa60dc0a53","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/187","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.508Z"}],"sources":[{"listingId":"3a4c85b8-3fc4-4588-81da-3cfa60dc0a53","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/187","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.508Z","lastSeenAt":"2026-04-22T02:32:07.145Z"}],"details":{"listingId":"3a4c85b8-3fc4-4588-81da-3cfa60dc0a53","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/187 \\\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":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/187"},{"claim":"All listed 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 platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/187"}],"useCases":["Accessing premium API content with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Integrating low-cost utility or data endpoints without subscription overhead"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over traditional API key subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.007Z"},"updatedAt":"2026-04-22T02:32:07.145Z"}}