{"id":"3aa8dc66-51e7-41b2-bd9d-f089b6b5b56b","shortId":"SBPB79","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or subscriptions required. The specific endpoint at `/api/v1/transactions/323` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals) on Base.\n\nThe platform advertises categories including 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 (geocoding, validation, conversion, generation). However, the crawled documentation pages (/docs, /api, /pricing, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual functionality behind these endpoints is unverified. There is no OpenAPI schema, no example request/response documentation, and no detailed description of what the `/api/v1/transactions/323` endpoint specifically does beyond its title \"Premium API Access.\"","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance","ai"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","micropayment endpoint"],"warnings":["No OpenAPI or schema documentation available for any endpoint","All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no content","The specific functionality of /api/v1/transactions/323 ('Premium API Access') is completely undocumented","Cannot verify that the advertised AI, analytics, finance, or utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/323","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/transactions/323","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, and the landing page lists many API categories. However, there is no OpenAPI schema, no documentation, no example requests or responses, and no description of what this specific endpoint actually returns after payment. The docs/pricing/README pages are all empty beyond a wallet 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'/api/v1/transactions/323':82,194 '/docs':154 '/pricing':156 '/readme':157 '/request':13,28 '0.02':12,27,59,104 '000':98 '20':97 '6':108 'Base network API' 'USDC micropayment API' 'access':88,203 'across':45 'actual':171 'advertis':114 'ai':124 'ai/ml':48 'analysi':128 'analyt':47,118 'api':5,20,37,71,87,202 'base':8,23,67,99,111 'behind':173 'beyond':198 'call':4,19 'categori':115 'challeng':93 'classif':131 'connect':162 'content':168 'convers':147 'crawl':151 'crypto-paid API' 'data':46,117,121 'decim':109 'descript':190 'detail':189 'document':152,186 'embed':132 'enabl':36 'endpoint':44,55,80,175,195 'estim':142 'exampl':184 'exchang':137 'export':122 'feed':136 'financ':133 'finance/web3':50 'function':172 'gas':141 'generat':148 'geocod':145 'howev':149 'i.e':103 'includ':116 'infer':49 'infrastructur':52,144 'insight':123 'json-response' 'key':72 'learn':126 'limit':74 'list':84 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':125 'metric':119 'micropayment endpoint' 'network':9,24,68 'no-api-key' 'offer':40 'openapi':181 'page':153 'paid':62 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'per':3,18,60 'platform':6,21,38,113 'post-method' 'premium':86,201 'price':57,135 'prompt':164 'quot':140 'rate':73,138 'report':120 'request':61,94 'request/response':185 'requir':77 'return':90,159 'schema':182 'sentiment':127 'sinc':105 'specif':79,196 'subscript':76 'substant':167 'summar':130 'text':129 'titl':200 'token':139 'unit':100 'unverifi':177 'usdc':15,30,64,102,106 'usdc-base-network' 'use':107 'util':53 'valid':146 'varieti':42 'via':10,25 'wallet':163 'web3':134 'x402':11,26,35,92 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"4d5b399d-9f9a-4403-88c1-361de7ea3c36","listingId":"3aa8dc66-51e7-41b2-bd9d-f089b6b5b56b","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/transactions/323","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:02.882Z"}],"sources":[{"listingId":"3aa8dc66-51e7-41b2-bd9d-f089b6b5b56b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/323","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:02.882Z","lastSeenAt":"2026-04-22T11:32:23.383Z"}],"details":{"listingId":"3aa8dc66-51e7-41b2-bd9d-f089b6b5b56b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/323 \\\n  -H \"Content-Type: application/json\"\n# Returns 402 with x402 payment challenge; attach X-PAYMENT header with valid USDC payment to access.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/transactions/323","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"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, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/323"},{"claim":"Platform advertises Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data without subscription or API key management","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need instant, keyless API access"],"bestFor":["Developers wanting frictionless pay-per-use API access via crypto","AI agents that can settle x402 payments autonomously","Users who prefer no-commitment, no-signup API consumption"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.02Z"},"updatedAt":"2026-04-22T11:32:23.383Z"}}