{"id":"d0d42807-bff8-4402-a6d9-aca765e74af6","shortId":"cQ8BkR","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transactions/191` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API 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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point.\n\nHowever, the specific endpoint being listed here (`/api/v1/transactions/191`) does not clearly map to any of the documented API categories. Its description is simply \"Premium API Access,\" and no further documentation, request/response schemas, or examples are available. The docs, pricing, and other pages on the site returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what this particular endpoint returns, callers should treat it as an opaque paid endpoint until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No documentation available — docs, pricing, and README pages all return only a 'Connect wallet' prompt with no content.","The endpoint path /api/v1/transactions/191 does not match any of the documented API categories on the landing page.","No request or response schema is provided; callers cannot know what data to send or expect back.","The purpose of this specific endpoint is unclear — 'Premium API Access' is not descriptive."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/191","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/191","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no documentation for what /api/v1/transactions/191 actually does or returns. No OpenAPI spec, no request/response schema, and the site's docs pages are empty. The endpoint description is generic (\"Premium API Access\") and doesn't map to any listed API 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'/request':13,28,154 '0.02':12,27,80,153 '000':74 '20':73 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,182 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':5,20,38,61,84,110,174,181 'attach':93 'avail':192 'base':8,23,51,75 'broader':106 'call':4,19,82 'caller':91,219 'categori':111,175 'challeng':67 'classif':127 'clear':167 'connect':205 'content':211 'convers':144 'crypto-paid endpoint' 'data':113,117 'descript':177 'doc':194 'document':173,186,230 'embed':128 'endpoint':55,147,160,217,227 'estim':138 'exampl':190 'exchang':133 'export':118 'feed':132 'financ':129 'gas':137 'generat':145 'geocod':142 'header':98 'howev':157 'http-post' 'i.e':79 'includ':112 'infrastructur':140 'insight':119 'key':85 'know':213 'learn':122 'limit':88 'list':58,149,162 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':121 'map':168 'metric':115 'multipl':109 'network':9,24,52 'no-api-key' 'opaqu':225 'page':198 'paid':226 'particular':216 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,69,97,103 'per':3,18,36,81 'platform':6,21,39,107 'point':156 'premium':60,180 'premium API access' 'price':131,155,195 'prompt':207 'proof':104 'protocol':44 'quot':136 'rate':87,134 'report':116 'request':37 'request/response':187 'requir':68,90 'return':64,202,218 'schema':188 'sentiment':123 'simpli':92,179 'site':201 'specif':54,159 'substant':210 'summar':126 'surfac':231 'text':125 'token':135 'treat':221 'unit':76 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':141 'valid':101,143 'via':10,25 'wallet':206 'web3':130 'without':212 'x':96 'x-payment':95 'x402':11,26,43,102 'x402 API' 'x402-payment'","prices":[{"id":"ef11841d-e47d-4d70-b491-8c0e5d8d5da1","listingId":"d0d42807-bff8-4402-a6d9-aca765e74af6","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/191","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:11.452Z"}],"sources":[{"listingId":"d0d42807-bff8-4402-a6d9-aca765e74af6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/191","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:11.452Z","lastSeenAt":"2026-04-22T17:02:13.852Z"}],"details":{"listingId":"d0d42807-bff8-4402-a6d9-aca765e74af6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/191 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/191"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/191"}],"useCases":["Programmatic access to a paid API endpoint without needing API keys or subscriptions","Agent-driven workflows that settle per-call costs in USDC on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 protocol payments","Agents that need keyless, pay-as-you-go API access","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users who need detailed documentation or guaranteed SLAs before calling","Anyone without a Base-network USDC wallet","High-volume use cases where $0.02/request adds up without bulk discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.954Z"},"updatedAt":"2026-04-22T17:02:13.852Z"}}