{"id":"f56d08d6-1097-4793-8b4a-a68394da1378","shortId":"VK3cvb","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/trades/35` appears to be part of a broader suite of pay-per-call APIs offered by the provider, spanning categories like data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints on the platform are priced at $0.02 per request, settled in USDC on Base.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is made via the `exact` scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) with a max amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The timeout is 300 seconds. No API keys or rate limits are advertised; access is instant upon payment.\n\nHowever, the specific functionality of `/api/v1/trades/35` is unclear. The endpoint path suggests it may relate to a specific trade record or trade-related data, but it is not listed among the documented APIs on the provider's landing page. No OpenAPI schema, request/response examples, or detailed documentation were found. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content. This makes it difficult to determine what data or service this particular endpoint returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["finance","data"],"synonyms":["trade data API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","premium trade endpoint"],"warnings":["The endpoint /api/v1/trades/35 is not listed among the provider's documented APIs — its purpose is unclear.","No OpenAPI spec, request schema, or response schema available.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no useful content.","Functionality must be inferred from the URL path alone; actual behavior is unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/35","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/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, the specific endpoint /api/v1/trades/35 is not documented on the provider's site, there is no OpenAPI schema, no request/response examples, and the docs pages are empty. The actual functionality is 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'0.02':10,28,97,141 '000':137 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':126 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':130 '20':136 '300':150 '6':145 'Base network API' 'USDC micropayment API' 'accept':114 'access':6,24,44,160 'addit':230 'address':125 'advertis':159 'ai':81 'among':195 'amount':134 'analyt':80 'api':5,16,23,34,43,71,153,198,219 'appear':58 'base':8,26,52,104,138 'base-network' 'broader':64 'call':70 'categori':77 'challeng':107 'confirm':108 'connect':225 'content':231 'contract':129 'data':79,189,239 'decim':146 'detail':211 'determin':237 'difficult':235 'doc':216 'document':197,212 'endpoint':38,56,90,110,174,244 'exact':122 'exampl':209 'financ':84 'found':214 'function':168 'gate':3,21 'given':142 'howev':165 'i.e':140 'infrastructur':87 'instant':162 'key':17,35,154 'land':203 'learn':83 'like':78 'limit':157 'list':194 'live':112 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':82 'made':119 'make':233 'max':133 'may':178 'network':53 'no-api-key' 'offer':72 'openapi':206 'page':204,220 'part':61 'particular':243 'path':175 'pay':9,27,68 'pay-per-cal':67 'pay-per-call API' 'pay-per-request' 'payment':48,117,164 'per':11,29,69,98 'platform':93 'post':115 'post-method' 'premium':4,22,42 'premium trade endpoint' 'price':95,217 'prompt':227 'protocol':49 'provid':41,75,201 'rate':156 'record':184 'relat':179,188 'render':222 'request':12,30,99,116 'request/response':208 'requir':18,36 'return':245 'schema':207 'scheme':123 'second':151 'servic':241 'settl':100 'span':76 'specif':55,167,182 'suggest':176 'suit':65 'timeout':148 'trade':183,187 'trade data API' 'trade-rel':186 'unclear':172 'unit':139 'upon':163 'usdc':14,32,102,128,143 'usdc-settlement' 'use':127 'util':88 'via':45,120 'wallet':226 'web3':85 'x402':2,20,47,106 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"871790a9-2412-4ac7-8845-c7495662fad3","listingId":"f56d08d6-1097-4793-8b4a-a68394da1378","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/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:49.140Z"}],"sources":[{"listingId":"f56d08d6-1097-4793-8b4a-a68394da1378","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:49.140Z","lastSeenAt":"2026-04-26T04:03:40.796Z"}],"details":{"listingId":"f56d08d6-1097-4793-8b4a-a68394da1378","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/35 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"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, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base, with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/trades/35"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/35"}],"useCases":["Fetching trade-related data with per-request USDC micropayments","Integrating x402-compatible payment flows into agent workflows","Accessing premium API data without managing API keys or subscriptions"],"bestFor":["Agents or developers wanting keyless, pay-per-use API access on Base","x402-compatible wallets and clients looking for low-cost endpoints","Prototyping micropayment-gated API integrations"],"notFor":["Users needing detailed documentation or guaranteed SLAs before integration","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.742Z"},"updatedAt":"2026-04-26T04:03:40.796Z"}}