{"id":"de0435e8-7c24-4b0a-9310-e145574c36f4","shortId":"vVwDTJ","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource `/api/v1/trades/144` appears to be part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind x402 micro-payments on the Base network.\n\nThe endpoint accepts POST requests and returns JSON. Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 given USDC's 6 decimals. There are no API keys, no rate limits, and no subscription commitments — each call is paid individually via the X-PAYMENT header. The x402 challenge timeout is 300 seconds.\n\nThe specific functionality behind `/api/v1/trades/144` is not documented in the crawled material. The site's landing page lists categories like Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure, but this particular trades endpoint is not among the advertised routes. It may represent a trade-specific data lookup (e.g., retrieving details for trade ID 144), but without documentation or example responses, the exact behavior is uncertain.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-method","micro-payment","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["trade data API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","trades endpoint"],"warnings":["The specific endpoint /api/v1/trades/144 is not listed among the advertised APIs on the landing page — its purpose is unclear.","Documentation pages (/docs, /pricing, /README, /api) returned no useful content beyond 'Connect wallet'.","No request body schema or response schema is available; behavior must be discovered empirically.","The 'trades' path segment suggests financial data, which may carry regulatory implications depending on jurisdiction."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/144","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/trades/144","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation for this specific /trades/144 route, no request/response schema, no examples, and the docs/pricing/README pages all returned only a 'Connect wallet' stub. The exact functionality is 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'0.02':10,24,112 '000':107 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':98 '144':203 '20':106 '300':146 '6':116 'Base network API' 'USDC micropayment API' 'accept':86 'access':6,20,36 'advertis':186 'ai':170 'ai/ml':66 'among':184 'amount':104 'analyt':65,169 'api':5,19,35,61,121 'appear':46 'base':8,22,82,100,108 'behavior':212 'behind':75,151 'broader':52 'call':60,131 'categori':166 'challeng':143 'commit':129 'contract':97 'crawl':158 'data':64,69,168,195 'decim':117 'detail':199 'document':155,206 'dozen':55 'e.g':197 'endpoint':30,62,85,181 'equal':111 'exact':211 'exampl':208 'financ':173 'finance/web3':68 'function':150 'gate':3,17,74 'given':113 'header':140 'id':202 'individu':134 'infer':67 'infrastructur':71,176 'json':91 'json-api' 'key':122 'land':163 'learn':172 'like':167 'limit':125 'list':165 'lookup':196 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':171 'materi':159 'maximum':103 'may':189 'micro':78 'micro-pay':77 'micro-payment' 'network':83 'no-api-key' 'no-rate-limit' 'offer':54 'page':164 'paid':133 'part':49 'particular':179 'pay':9,23,58 'pay-per-cal':57 'pay-per-call API' 'pay-per-request' 'payment':40,79,92,139 'per':11,25,59 'platform':53 'post':87 'post-method' 'premium':4,18,34 'protocol':41 'provid':33 'rate':124 'repres':190 'request':12,26,88 'resourc':44 'respons':209 'retriev':198 'return':90 'rout':187 'second':147 'settl':94 'site':161 'span':63 'specif':43,149,194 'subscript':128 'timeout':144 'trade':180,193,201 'trade data API' 'trade-specif':192 'trades endpoint' 'uncertain':214 'unit':109 'usdc':14,28,96,114 'usdc-base' 'util':72 'via':37,135 'web3':174 'without':205 'x':138 'x-payment':137 'x402':2,16,39,76,142 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"af4dd8c2-1f0f-44e8-b08b-87125bd69c6e","listingId":"de0435e8-7c24-4b0a-9310-e145574c36f4","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/trades/144","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:44.412Z"}],"sources":[{"listingId":"de0435e8-7c24-4b0a-9310-e145574c36f4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/144","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:44.412Z","lastSeenAt":"2026-04-26T05:32:45.790Z"}],"details":{"listingId":"de0435e8-7c24-4b0a-9310-e145574c36f4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/144 \\\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 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/144"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/144"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving trade-related data on a per-call payment basis","Integrating x402-gated endpoints into autonomous agent workflows","Accessing premium API data without subscription or API key management"],"bestFor":["Agents or applications that need keyless, pay-per-call API access","Developers experimenting with x402 micropayment protocols on Base","Use cases requiring low-friction, no-commitment API consumption"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.963Z"},"updatedAt":"2026-04-26T05:32:45.790Z"}}