{"id":"e03456a6-ce58-4c56-be1e-7f9495effb39","shortId":"7j9qBf","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general-purpose utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/155` is listed as \"Premium API Access\" and follows the same x402 payment pattern. Its exact functionality is not documented beyond the generic title; it accepts HTTP POST and returns `application/json`. The x402 challenge confirms it is live, requesting a maximum of 20,000 base units of USDC (i.e., $0.02) on Base, payable to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`.\n\nThe broader platform advertises categories including metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. No OpenAPI schema, detailed documentation, or example request/response payloads were found during crawling; the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","http-post","no-api-key","no-rate-limit"],"categories":["api-marketplace","general"],"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 any endpoint","The specific endpoint /api/v1/messages/155 has no description beyond 'Premium API Access' — its actual functionality is unknown","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/155","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/155","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation of request/response formats, and no examples. The specific endpoint's purpose ('Premium API Access' at /api/v1/messages/155) is entirely opaque. The crawled pages beyond the landing page returned no useful 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'/api/v1/messages/155':105 '/pricing':213 '/readme':215 '/request':18,36 '0.02':17,35,69,154,195 '000':148 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':160 '20':147 'accept':130 'access':111 'address':159 'advertis':164 'ai':12,30 'ai/ml':55 'analysi':173 'analyt':11,29,54 'api':5,23,43,82,110 'application/json':135 'attach':93 'base':8,26,77,149,156 'base network api' 'beyond':125 'broad':48 'broader':162 'call':4,22 'caller':91 'categori':165 'challeng':138 'classif':176 'collect':49 'commit':90 'confirm':139 'connect':221 'content':227 'convers':188 'cover':10,28 'crawl':210 'data':53,58,169 'detail':201 'document':124,202 'embed':177 'enabl':42 'endpoint':51,65,103 'estim':185 'everi':64 'exact':120 'exampl':204 'exchang':180 'export':170 'feed':179 'financ':13,31 'finance/web3':57 'follow':113 'found':208 'function':121 'gas':184 'general':61 'general-purpos':60 'generat':190 'generic':127 'geocod':186 'header':97 'http':131 'http-post' 'i.e':153 'includ':166 'infer':56 'insight':171 'json-api' 'key':83 'limit':86 'list':107 'live':142 'low payment fee' 'lowpaymentfee.com':37 'maximum':145 'metric':167 'micropayment api' 'minimum':89 'network':78 'no-api-key' 'no-rate-limit' 'offer':46 'openapi':199 'page':216 'pattern':118 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payabl':157 'payload':206 'payment':96,117 'per':3,21,70 'platform':44,163 'point':197 'post':132 'premium':109 'premium api access' 'price':67,178,196 'prompt':223 'purpos':62 'quot':183 'rate':85,181 'report':168 'request':71,100,143 'request/response':205 'return':134,218 'schema':200 'sentiment':172 'settl':72 'simpli':92 'span':52 'specif':102 'substant':226 'suit':6,24 'summar':175 'text':174 'titl':128 'token':182 'unit':150 'usdc':9,27,74,152 'usdc api' 'usdc-base' 'util':15,33,63 'valid':187 'wallet':222 'x402':41,95,116,137 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"ad35359a-5618-4f87-8ab1-b44fc8b24364","listingId":"e03456a6-ce58-4c56-be1e-7f9495effb39","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/155","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.383Z"}],"sources":[{"listingId":"e03456a6-ce58-4c56-be1e-7f9495effb39","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/155","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.383Z","lastSeenAt":"2026-04-22T02:32:06.926Z"}],"details":{"listingId":"e03456a6-ce58-4c56-be1e-7f9495effb39","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/155 \\\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 402 challenge requesting 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/messages/155"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access across analytics, AI, finance, and utility endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on the Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/155"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Programmatic access to analytics, AI inference, or financial data with per-call USDC micropayments","Testing x402 payment flows against a live, low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","AI agents that need keyless, pay-as-you-go API access on Base","Low-volume or sporadic API consumers who want no commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.122Z"},"updatedAt":"2026-04-22T02:32:06.926Z"}}