{"id":"7a5bd5d4-02b4-42c7-a038-ba0019f0c52d","shortId":"GT8U4f","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/52` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers 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 listed at the same $0.02/request price point.\n\nHowever, the specific functionality of the `/api/v1/transactions/52` endpoint is unclear. The title \"Premium API Access\" is generic, and no documentation, request/response schemas, or examples are available beyond the x402 challenge itself. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what data or service this particular endpoint returns, callers should treat this as an exploratory integration.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["infrastructure","finance"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment required"],"warnings":["No documentation available — docs, pricing, and API pages all return only 'Connect wallet' with no content","The specific functionality of /api/v1/transactions/52 ('Premium API Access') is completely undocumented","No request or response schema provided; callers cannot know what to send or expect back","The broader platform lists many endpoint categories but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/52","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/52","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, confirming pricing and payment details. However, there is no documentation, no request/response schema, and no explanation of what this specific endpoint actually does. The docs pages are empty (\"Connect wallet\" only). The listing is effectively a stub with confirmed 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'/request':13,28,152 '0.02':12,27,78,151 '000':72 '20':71 '402':66 '402 payment required' 'accept':46 'access':62,92,169 'across':108 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,168,190 'attach':95 'avail':180 'base':8,23,51,73 'base network api' 'beyond':181 'broader':104 'call':4,19,80 'caller':213 'categori':110 'challeng':67,184 'classif':125 'connect':196 'content':202 'convers':142 'data':111,115,206 'doc':187 'document':174 'embed':126 'endpoint':55,107,145,162,211 'estim':136 'exampl':178 'exchang':131 'exploratori':219 'export':116 'feed':130 'financ':127 'four':109 'function':158 'gas':135 'generat':143 'generic':171 'geocod':140 'header':99 'howev':155 'http-post' 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'integr':220 'json-response' 'key':86 'know':204 'learn':120 'limit':89 'list':58,147 'low payment fee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':106 'page':191 'particular':210 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,98 'per':3,18,36,79 'platform':6,21,39,82,105 'point':154 'premium':60,167 'price':129,153,188 'prompt':198 'protocol':44 'quot':134 'rate':88,132 'report':114 'request':37,68,102 'request/response':175 'return':64,193,212 'schema':176 'sentiment':121 'servic':208 'simpli':94 'specif':54,157 'substant':201 'summar':124 'text':123 'titl':166 'token':133 'treat':215 'unclear':164 'unit':74 'usdc':15,30,47,76 'usdc api' 'usdc-base-network' 'use':41 'util':139 'valid':141 'via':10,25 'wallet':197 'web3':128 'without':203 'x402':11,26,43,97,183 'x402 api' 'x402-payment'","prices":[{"id":"36bdbc01-8b76-4062-b04c-8f685b654b15","listingId":"7a5bd5d4-02b4-42c7-a038-ba0019f0c52d","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/52","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:56.246Z"}],"sources":[{"listingId":"7a5bd5d4-02b4-42c7-a038-ba0019f0c52d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/52","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:56.246Z","lastSeenAt":"2026-04-24T02:32:54.661Z"}],"details":{"listingId":"7a5bd5d4-02b4-42c7-a038-ba0019f0c52d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/52 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/52"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/52"}],"useCases":["Programmatic access to API services without managing API keys or subscriptions","Agent-driven workflows that need on-demand paid endpoints settled in USDC on Base","Exploring x402 protocol integration with minimal per-request cost"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-as-you-go API access on Base","Low-cost per-request API consumption without commitments"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume use cases where $0.02/request adds up without bulk discounts","Anyone needing non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.548Z"},"updatedAt":"2026-04-24T02:32:54.661Z"}}