{"id":"be99df48-b738-497a-9935-1213e30ee021","shortId":"etKEjt","kind":"x402","title":"x402-payable API offering trades data, analytics, AI, finance, and utility endpoints at $0.02/request on Base.","tagline":"x402-payable API offering trades data, analytics, AI, finance, and utility endpoints at $0.02/request on Base.","description":"lowpaymentfee.com is an x402-enabled API platform that exposes a broad catalog of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure/utility categories. All endpoints are pay-per-request with no API keys, no rate limits, and no commitments — payment is handled inline via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint at `/api/v1/trades/200` is listed as \"Premium API Access\" and accepts POST requests. Based on the x402 challenge, the maximum amount required is 20,000 base units of USDC (contract 0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The site advertises a uniform $0.02/request price across all its endpoints. Payment settles to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/trades/200` endpoint actually returns. The endpoint name and path suggest it may return trade data (possibly the last 200 trades or a trade with ID 200), but this is speculative. The site's homepage groups endpoints into categories but does not list this specific trades endpoint among them, adding further ambiguity.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","trades-data","post-endpoint"],"categories":["finance","data"],"synonyms":["lowpaymentfee","trades API","x402 API","USDC micropayment API","Base network API","pay-per-call API","crypto trades endpoint"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all return only a wallet-connect prompt","No OpenAPI or JSON schema describing request parameters or response format","The /api/v1/trades/200 endpoint is not listed on the homepage's endpoint catalog, making its purpose unclear","Cannot verify what data this endpoint actually returns without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/200","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/200","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) with clear pricing ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of the /trades/200 endpoint is unclear. The docs pages are empty. This is effectively a stub 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'/api/v1/trades/200':98,197 '/docs':166 '/pricing':168 '/readme':170 '/request':16,34,145 '0.02':15,33,132,144 '000':120 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':155 '0x8335':126 '20':119 '200':215,222 '2913':127 '300':158 '6':137 'Base network API' 'USDC micropayment API' 'accept':106 'access':104 'across':52,147 'actual':199 'ad':245 'address':154 'advertis':141 'ai':9,27,55 'ambigu':247 'among':243 'amount':116 'analyt':8,26,54 'api':4,22,43,72,103 'base':18,36,90,109,121,129 'broad':48 'catalog':49 'categori':62,234 'challeng':113 'commit':79 'connect':176 'content':182 'contract':125 'crypto trades endpoint' 'data':7,25,53,211 'decim':138 'descript':193 'document':161 'enabl':42 'endpoint':13,31,51,64,96,150,198,202,232,242 'equal':131 'exampl':190 'expos':46 'extrem':163 'financ':10,28,58 'group':231 'handl':82 'homepag':230 'id':221 'infrastructure/utility':61 'inlin':83 'key':73 'last':214 'learn':57 'limit':76 'list':100,238 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':56 'maximum':115 'may':208 'name':203 'network':91 'no-api-key' 'offer':5,23 'openapi':186 'page':171 'path':205 'pay':67 'pay-per-call API' 'pay-per-request':66 'payabl':3,21 'payment':80,151 'per':68,133 'platform':44 'possibl':212 'post':107 'post-endpoint' 'premium':102 'price':146 'prompt':178 'protocol':87 'rate':75 'render':173 'request':69,108,134 'request/response':189 'requir':117 'return':200,209 'schema':187 'second':159 'settl':152 'site':140,228 'spars':164 'specif':95,240 'specul':226 'suggest':206 'timeout':160 'trade':6,24,210,216,219,241 'trades API' 'trades-data' 'uniform':143 'unit':122 'usdc':93,124,135 'usdc-base' 'use':92,136 'util':12,30 'via':84 'wallet':177 'web3':59 'x402':2,20,41,86,112 'x402 API' 'x402-enabled':40 'x402-payable':1,19 'x402-payment'","prices":[{"id":"ae0a8116-67f0-43c1-b5c4-c4c88a062471","listingId":"be99df48-b738-497a-9935-1213e30ee021","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/200","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:53.301Z"}],"sources":[{"listingId":"be99df48-b738-497a-9935-1213e30ee021","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/200","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:53.301Z","lastSeenAt":"2026-04-26T04:32:50.430Z"}],"details":{"listingId":"be99df48-b738-497a-9935-1213e30ee021","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/200 \\\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":"Uniform pricing of $0.02 per request across all endpoints, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/trades/200"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/200"},{"claim":"Docs, pricing, API, and README pages render only a Connect wallet prompt with no content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching trade data via a single paid API call without needing an API key","Integrating low-cost per-request data access into autonomous agent workflows","Programmatic access to trade information settled on Base L2 with USDC"],"bestFor":["Agents or scripts that need keyless, pay-per-use API access","Developers experimenting with x402 payment protocol integrations","Low-volume consumers who want no subscription or rate-limit overhead"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.571Z"},"updatedAt":"2026-04-26T04:32:50.430Z"}}