{"id":"ad85f968-2a7d-4cfc-acb3-4056c854bd8a","shortId":"HPf6dg","kind":"x402","title":"Pay-per-call premium API access on Base network via x402 protocol at $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base network via x402 protocol at $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific path `/api/v1/transfers/3` is one of many endpoints offered by the platform, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities.\n\nThe platform operates on a simple pay-per-request model with no API keys, no rate limits, and no commitments required. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The x402 challenge indicates a maxAmountRequired of 20000 base units, which equals $0.02 USD (USDC uses 6 decimals). The endpoint accepts POST requests and returns application/json responses.\n\nWhile the landing page lists numerous endpoints across analytics, AI/ML, finance, and utility categories, the specific functionality of `/api/v1/transfers/3` is not clearly documented. The \"transfers\" path suggests it may relate to financial transfer operations, but no detailed documentation, request/response schemas, or examples are available from the crawled pages. The docs, API, pricing, and README pages all only show a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-api","no-api-key","no-rate-limit"],"categories":["finance","infrastructure"],"synonyms":["premium API","pay-per-call API","x402 endpoint","USDC API","Base network API","micropayment API","transfers API"],"warnings":["No documentation available for the specific /api/v1/transfers/3 endpoint","No request or response schema provided","All doc/pricing/README pages only show 'Connect wallet' with no content","The 'transfers' endpoint purpose is unclear - not listed on the landing page's available APIs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/3","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/transfers/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation for the specific /transfers/3 endpoint, no request/response schema, and no examples. The crawled docs pages are empty beyond a wallet connect 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'/request':16,34 '0.02':15,33,122 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':109 '20000':117 '6':126 'Base network API' 'USDC API' 'accept':130 'access':7,25,44 'across':144 'addit':201 'ai':69 'ai/ml':146 'analyt':68,145 'api':6,24,43,90,187 'application/json':135 'avail':180 'base':9,27,104,118 'base-network' 'call':4,22 'categori':65,150 'challeng':112 'clear':158 'commit':97 'connect':196 'content':202 'contract':108 'crawl':183 'data':67 'decim':127 'detail':173 'doc':186 'document':159,174 'endpoint':38,58,129,143 'equal':121 'exampl':178 'financ':72,147 'financi':168 'function':153 'includ':66 'indic':113 'infrastructur':75 'json-api' 'key':91 'land':139 'learn':71 'limit':94 'list':141 'lowpaymentfee.com':40 'machin':70 'mani':57 'maxamountrequir':115 'may':165 'micropayment API' 'model':87 'network':10,28,105 'no-api-key' 'no-rate-limit' 'numer':142 'offer':59 'one':55 'oper':79,170 'page':140,184,191 'path':52,162 'pay':2,20,84 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':83 'payment':48,99 'per':3,21,85 'platform':62,78 'post':131 'premium':5,23,42 'premium API' 'price':188 'prompt':198 'protocol':13,31,49 'provid':41 'rate':93 'readm':190 'relat':166 'request':86,132 'request/response':175 'requir':98 'respons':136 'return':134 'schema':176 'settl':101 'show':194 'simpl':82 'span':64 'specif':51,152 'suggest':163 'transfer':161,169 'transfers API' 'unit':119 'usd':123 'usdc':18,36,107,124 'usdc-settlement' 'use':106,125 'util':76,149 'via':11,29,45 'wallet':197 'web3':73 'x402':12,30,47,111 'x402 endpoint' 'x402-payment'","prices":[{"id":"d473e1c4-43a4-48a2-9551-2a94a521caff","listingId":"ad85f968-2a7d-4cfc-acb3-4056c854bd8a","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/transfers/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:43.396Z"}],"sources":[{"listingId":"ad85f968-2a7d-4cfc-acb3-4056c854bd8a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/3","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:43.396Z","lastSeenAt":"2026-04-23T20:33:15.271Z"}],"details":{"listingId":"ad85f968-2a7d-4cfc-acb3-4056c854bd8a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/3 \\\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 with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/3"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transfers/3"}],"useCases":["Programmatic access to transfer-related data or operations without subscription","Agent-driven API calls with per-request crypto payment","Integrating pay-as-you-go API services into automated workflows"],"bestFor":["Developers wanting no-commitment API access with crypto payments","AI agents that can settle x402 payments on Base","Users who prefer per-call pricing over monthly subscriptions"],"notFor":["Users who need detailed API documentation before integrating","High-volume use cases where per-request pricing becomes expensive","Developers who cannot transact in USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.217Z"},"updatedAt":"2026-04-23T20:33:15.271Z"}}