{"id":"0d79003d-60c8-4f8d-9416-1407b420cd0d","shortId":"8vCazL","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 resource `/api/v1/trades/188` 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 priced at $0.02 per request in USDC.\n\nThe endpoint accepts POST requests and returns JSON. Payment is settled on-chain via USDC (contract 0x8335…2913) on Base, using the x402 \"exact\" scheme. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific functionality behind `/api/v1/trades/188` is not documented in the crawled material. The path suggests a trade-related resource (possibly a specific trade record or trade execution endpoint), but no schema, request body format, or response examples are available. The broader site lists categories like finance/prices, crypto/quotes, and crypto/gas, so this endpoint likely falls within the finance or trading domain. Documentation pages (/docs, /pricing, /README) all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["finance","data"],"synonyms":["trade API","x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto trade endpoint","web3 API"],"warnings":["No documentation available — /docs, /pricing, and /README pages all return only 'Connect wallet' with no content.","The specific functionality of /api/v1/trades/188 is undocumented; the path suggests trade data but details are unknown.","No request body schema or response schema is provided.","No OpenAPI spec or AI plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/188","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/188","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation for this specific endpoint — no request schema, no response schema, no examples. The /docs, /pricing, and /README pages are all empty (just 'Connect wallet'). The purpose of /api/v1/trades/188 is 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'/docs':226 '/pricing':227 '/readme':228 '0.02':10,28,88,136 '000':127 '0x8335':110 '20':126 '2913':111 '6':132 'Base network API' 'USDC micropayment API' 'accept':95 'access':6,24,44 'ai/ml':78 'amount':121 'analyt':77 'api':5,16,23,34,43,73,140 'appear':58 'attach':151 'avail':202 'base':8,26,52,113,128 'base-network' 'behind':166 'bodi':196 'broader':64,204 'call':72,124 'caller':149 'categori':207 'chain':106 'commit':148 'connect':233 'content':239 'contract':109 'crawl':173 'crypto trade endpoint' 'crypto/gas':212 'crypto/quotes':210 'data':76,81 'decim':133 'document':170,224 'domain':223 'dozen':67 'endpoint':38,74,94,191,215 'equal':135 'exact':117 'exampl':200 'execut':190 'fall':217 'financ':220 'finance/prices':209 'finance/web3':80 'format':197 'function':165 'gate':3,21 'header':156 'infer':79 'infrastructur':83 'json':100 'json-response' 'key':17,35,141 'like':208,216 'limit':144 'list':206 'lowpaymentfee' 'lowpaymentfee.com':40 'materi':174 'maximum':120 'network':53 'no-api-key' 'offer':66 'on-chain':104 'page':225 'part':61 'path':176 'pay':9,27,70 'pay-per-cal':69 'pay-per-call API' 'pay-per-request' 'payment':48,101,155,161 'per':11,29,71,89,123 'platform':65 'possibl':183 'post':96 'post-method' 'premium':4,22,42 'price':86 'prompt':235 'proof':162 'protocol':49 'provid':41 'rate':143 'record':187 'relat':181 'request':12,30,90,97,195 'requir':18,36,122 'resourc':56,182 'respons':199 'return':99,230 'schema':194 'scheme':118 'settl':103 'simpli':150 'site':205 'span':75 'specif':55,164,185 'subscript':147 'substant':238 'suggest':177 'trade':180,186,189,222 'trade API' 'trade-rel':179 'unit':129 'usdc':14,32,92,108,131 'usdc-settlement' 'use':114 'util':84 'valid':159 'via':45,107 'wallet':234 'web3 API' 'within':218 'x':154 'x-payment':153 'x402':2,20,47,116,160 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"0537f1fc-1f49-4f04-8526-05c569c7434c","listingId":"0d79003d-60c8-4f8d-9416-1407b420cd0d","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/188","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:46.187Z"}],"sources":[{"listingId":"0d79003d-60c8-4f8d-9416-1407b420cd0d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/188","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:46.187Z","lastSeenAt":"2026-04-26T05:32:45.842Z"}],"details":{"listingId":"0d79003d-60c8-4f8d-9416-1407b420cd0d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/188 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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, exact scheme, on Base network, requiring 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).","source_url":"https://lowpaymentfee.com/api/v1/trades/188"},{"claim":"The platform advertises $0.02 per request, no API keys, no rate limits, instant access, Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists API categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching or executing trade-related data via a single paid API call","Integrating pay-per-use API access into autonomous agents without managing API keys","Accessing financial or trading data on-demand with USDC micropayments on Base"],"bestFor":["Agents or bots that need keyless, pay-per-call API access","Developers wanting to test x402 payment flows on Base","Use cases requiring low-cost ($0.02) on-demand API calls without subscriptions"],"notFor":["Users who need detailed documentation or well-defined request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.915Z"},"updatedAt":"2026-04-26T05:32:45.842Z"}}