{"id":"b9f718ef-5165-47f1-a6e5-6c04df222b67","shortId":"4y4G23","kind":"x402","title":"Pay-per-call trade data endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call trade data endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at `/api/v1/trades/40` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints use the x402 payment protocol on the Base network, accepting USDC (USD Coin) for per-request micropayments with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/trades/40` is labeled \"Premium API Access\" in the x402 challenge. Based on the URL path (`/trades/40`), it likely returns trade-related data for a specific resource identified by ID 40, though the exact response schema is not documented. The endpoint accepts POST requests and returns `application/json`. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the platform's uniform pricing of $0.02/request across all endpoints.\n\nThe platform advertises no API keys, no rate limits, and instant access. Payment is handled entirely through the x402 `X-PAYMENT` header. The payment is settled on the Base L2 network to the address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, with a maximum timeout of 300 seconds. Documentation beyond the landing page is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-micropayment","trade-data","json-response","no-api-key","post-method"],"categories":["finance","data"],"synonyms":["trade data API","x402 micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee","crypto trade endpoint","web3 API"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no content","No request or response schema documented for this endpoint","The exact nature of the data returned by /api/v1/trades/40 is unknown — 'Premium API Access' is a generic label","This specific endpoint path (/api/v1/trades/40) is not listed on the landing page among the advertised APIs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/40","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/40","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/request in USDC on Base). However, there is no OpenAPI schema, no documented request/response format, no examples, and the docs/pricing/README pages are all empty beyond a wallet connect prompt. The purpose of `/api/v1/trades/40` is only inferable from the URL path; no description of what trade data is returned 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'/request':17,34,173 '/trades/40':112 '0.02':16,33,161,172 '000':152 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':212 '20':151 '300':218 '40':127 '6':157 'Base network API' 'USDC API' 'accept':74,138 'access':102,188 'across':174 'addit':244 'address':211 'advertis':179 'ai/ml':57 'amount':146 'analyt':56 'api':53,85,101,181,230 'application/json':143 'base':9,26,72,107,153,206 'base-network' 'beyond':221 'call':4,21,149 'challeng':106 'coin':77 'collect':48 'commit':92 'connect':239 'consist':164 'content':245 'crypto trade endpoint' 'data':6,23,55,119 'decim':158 'doc':229 'document':135,220 'endpoint':7,24,36,64,96,137,176 'entir':192 'equal':160 'exact':130 'extrem':226 'finance/web3':59 'handl':191 'header':199 'id':126 'identifi':124 'infer':58 'infrastructur':61 'instant':187 'json-response' 'key':86,182 'l2':207 'label':99 'land':223 'like':114 'limit':89,185 'lowpaymentfee' 'lowpaymentfee.com':43 'maximum':145,215 'micropay':82 'network':73,208 'no-api-key' 'offer':46 'page':224,234 'part':40 'path':111 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'payment':68,189,198,201 'per':3,20,80,148,162 'per-request':79 'per-request-micropayment' 'platform':44,167,178 'post':139 'post-method' 'premium':100 'price':170,231 'prompt':241 'protocol':52,69 'rate':88,184 'readm':233 'relat':118 'render':236 'request':81,140,163 'requir':93,147 'resourc':123 'respons':131 'return':115,142 'schema':132 'second':219 'settl':12,29,203 'span':54 'spars':227 'specif':95,122 'though':128 'timeout':216 'trade':5,22,117 'trade data API' 'trade-data' 'trade-rel':116 'uniform':169 'unit':154 'url':110 'usd':76 'usdc':14,31,75,156 'usdc-settlement' 'use':65 'util':62 'via':10,27 'wallet':240 'web3 API' 'x':197 'x-payment':196 'x402':11,28,51,67,105,195 'x402 micropayment API' 'x402-payment' 'x402-protocol':50","prices":[{"id":"5b29d1bd-7644-471e-9200-3b7ac1b07365","listingId":"b9f718ef-5165-47f1-a6e5-6c04df222b67","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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:52.684Z"}],"sources":[{"listingId":"b9f718ef-5165-47f1-a6e5-6c04df222b67","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/40","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:52.684Z","lastSeenAt":"2026-04-26T04:03:40.918Z"}],"details":{"listingId":"b9f718ef-5165-47f1-a6e5-6c04df222b67","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/40 \\\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 x402Version 1, requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/40"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/trades/40"},{"claim":"Platform advertises $0.02/request uniform pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with maxTimeoutSeconds of 300","source_url":"https://lowpaymentfee.com/api/v1/trades/40"},{"claim":"Docs, pricing, and README pages render only 'Connect wallet' with no additional documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching trade data for a specific resource on demand with per-call USDC payment","Integrating pay-per-use trade information into agent workflows without managing API keys","Programmatic access to trade records settled via x402 on Base"],"bestFor":["Agents or bots that need on-demand trade data without subscription commitments","Developers experimenting with x402 micropayment protocol integrations","Low-volume consumers who prefer pay-per-call over monthly plans"],"notFor":["High-volume consumers needing bulk trade data at discounted rates","Users who need detailed API documentation or response schema guarantees before integrating","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.614Z"},"updatedAt":"2026-04-26T04:03:40.918Z"}}