{"id":"f2894701-428e-4ae2-afba-b92440287a26","shortId":"SVpHRc","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 path `/api/v1/trades/168` suggests a trade-data or financial-data endpoint, though the exact response payload is not documented. The site hosts a broader suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments required.\n\nPayment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The x402 challenge advertises a maxAmountRequired of 20000 base units, which at 6 decimals equals $0.02 USD — consistent with the site's stated pricing. The endpoint accepts POST requests and returns application/json. A 300-second payment timeout is allowed.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no example payloads available. The specific behavior of the `/api/v1/trades/168` path (whether it returns a single trade record, aggregated trade data, or something else) cannot be determined from the available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","json-response","post-method","per-request-pricing","no-api-key"],"categories":["finance","data"],"synonyms":["trade data API","x402 API","pay-per-call API","USDC API","Base network API","lowpaymentfee","crypto payment API","micropayment API"],"warnings":["No OpenAPI spec or request/response schema available","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific behavior and response format of /api/v1/trades/168 is undocumented and cannot be verified","The endpoint path suggests trade data but no details confirm what data is returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/168","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/168","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 challenge with clear pricing, but there is no documentation, no request/response schema, no examples, and the specific purpose of /api/v1/trades/168 is unclear. The docs pages are empty beyond a wallet-connect 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'/api/v1/trades/168':46,191 '/docs':156 '/pricing':157 '/readme':160 '0.02':10,24,87,127 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':111 '20000':119 '300':145 '6':124 'Base network API' 'USDC API' 'accept':138 'access':6,20,36 'advertis':115 'aggreg':200 'ai':76 'allow':150 'analyt':75 'api':5,19,35,72,92 'application/json':143 'avail':185,211 'base':8,22,106,120 'base-network' 'behavior':188 'broader':69 'cannot':206 'challeng':114 'commit':99 'connect':166 'consist':129 'content':172 'contract':110 'crypto payment API' 'data':51,55,74,202 'decim':125 'determin':208 'document':64,151 'els':205 'endpoint':30,56,137 'equal':126 'exact':59 'exampl':183 'extrem':153 'financ':79 'financi':54 'financial-data':53 'gate':3,17 'host':67 'infrastructur':82 'json-response' 'key':93 'learn':78 'limit':96 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':77 'materi':212 'maxamountrequir':117 'micropayment API' 'network':107 'no-api-key' 'openapi':176 'page':161 'path':45,192 'pay':9,23 'pay-per-call API' 'payload':61,184 'payment':40,101,147 'per':11,25,88 'per-request-pricing' 'post':139 'post-method' 'premium':4,18,34 'price':85,135 'prompt':168 'protocol':41 'provid':33 'rate':95 'record':199 'render':163 'request':12,26,89,140 'request/response':179 'requir':100 'resourc':44 'respons':60 'return':142,195 'schema':180 'second':146 'settl':103 'singl':197 'site':66,132 'someth':204 'span':73 'spars':154 'spec':177 'specif':43,187 'state':134 'suggest':47 'suit':70 'though':57 'timeout':148 'trade':50,198,201 'trade data API' 'trade-data':49 'unit':121 'usd':128 'usdc':14,28,109 'usdc-settlement' 'use':108 'util':83 'via':37 'wallet':167 'web3':80 'whether':193 'x402':2,16,39,113 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"ada58cd1-f1ee-409e-bacb-e3a7fd77094f","listingId":"f2894701-428e-4ae2-afba-b92440287a26","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/168","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:40.798Z"}],"sources":[{"listingId":"f2894701-428e-4ae2-afba-b92440287a26","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/168","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:40.798Z","lastSeenAt":"2026-04-26T07:03:05.598Z"}],"details":{"listingId":"f2894701-428e-4ae2-afba-b92440287a26","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/168 \\\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":"The site lists APIs 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 shows maxAmountRequired of 20000 base units in USDC on Base with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/trades/168"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/168"},{"claim":"Documentation pages render only a Connect wallet prompt with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching trade data or financial records on a per-request payment basis","Integrating pay-per-call data access into autonomous agents via x402","Accessing premium API content without traditional API key registration"],"bestFor":["Agents or applications that need keyless, pay-per-use API access","Developers experimenting with x402 micropayment protocols on Base","Use cases requiring low-friction access to trade or financial data"],"notFor":["Users needing well-documented API schemas and response contracts before integration","High-volume consumers who need bulk pricing or subscription plans","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.133Z"},"updatedAt":"2026-04-26T07:03:05.598Z"}}