{"id":"d9f0e8b6-9017-4d61-b742-c404d819b24d","shortId":"MXW7Zv","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/trades/84` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a max amount of 20,000 base units of USDC (0x8335…), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 exact scheme with no API keys, rate limits, or subscriptions required.\n\nThe broader platform advertises four categories of endpoints: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The specific functionality of the `/api/v1/trades/84` endpoint (the \"84\" path segment suggests a resource ID for a particular trade) is not documented beyond its title. Agents should expect JSON responses based on the declared mimeType, but the exact schema is unknown.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response","post-method"],"categories":["finance","data"],"synonyms":["micropayment API","pay-per-call API","x402 endpoint","USDC API","Base network API","trades API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The /docs, /pricing, /api, and /README pages all render only 'Connect wallet' with no usable content","The specific function of /api/v1/trades/84 is unknown — 'Premium API Access' is a generic label","No request body schema or response schema is documented anywhere in the crawled material","The platform lists many endpoint categories but none appear to include a 'trades' category, making this endpoint's purpose unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/84","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of /api/v1/trades/84 is undocumented. This is effectively a stub listing with confirmed 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'/api/v1/trades/84':67,217 '/docs':176 '/pricing':178 '/readme':180 '/request':17,34,168 '0.02':16,33,95,167 '000':87 '0x8335':92 '20':86 '6':100 '84':220 'Base network API' 'USDC API' 'accept':75 'access':45,73 'advertis':122 'agent':237 'ai':10,27,134 'amount':84 'analysi':138 'analyt':128 'api':4,21,41,72,112 'avail':207 'base':7,24,61,88,242 'base-network' 'behind':51 'beyond':234 'broader':120 'categori':124 'challeng':80 'classif':141 'connect':186 'content':211 'convers':158 'crawl':210 'data':9,26,127,131 'decim':101 'declar':245 'detail':193 'document':171,202,233 'embed':142 'endpoint':14,31,50,65,126,161,218 'equal':94 'estim':152 'exact':108,249 'exampl':206 'exchang':147 'expect':239 'export':132 'extrem':173 'feed':146 'financ':11,28,143 'four':123 'function':214 'gas':151 'gate':3,20,44 'generat':159 'geocod':156 'id':226 'indic':81 'infrastructur':154 'insight':133 'json':240 'json-response' 'key':113 'learn':136 'limit':115 'list':69,163 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':135 'made':104 'marketplac':42 'max':83 'metric':129 'micropay':55 'micropayment API' 'mimetyp':246 'network':62 'no-api-key' 'offer':8,25 'openapi':197 'page':181 'particular':229 'path':221 'pay-per-call API' 'payment':102 'per':53,96 'per-request':52 'per-request-billing' 'platform':5,22,121 'point':170 'post':76 'post-method' 'premium':71 'price':145,169 'prompt':188 'protocol':40 'quot':150 'rate':114,148 'render':183 'report':130 'request':54,77,97 'request/response':200 'requir':118 'resourc':225 'respons':241 'schema':201,250 'scheme':109 'segment':222 'sentiment':137 'settl':56 'spars':174 'spec':198 'specif':64,213 'subscript':117 'suggest':223 'summar':140 'technic':192 'text':139 'titl':236 'token':149 'trade':230 'trades API' 'unit':89 'unknown':252 'usag':205 'usdc':58,91,98 'usdc-micropayment' 'use':99 'util':13,30,155 'valid':157 'varieti':48 'via':105 'wallet':187 'web3':144 'x402':2,19,39,79,107 'x402 endpoint' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"38ac085b-5a50-4ff5-8223-706a96c7fa35","listingId":"d9f0e8b6-9017-4d61-b742-c404d819b24d","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:07.012Z"}],"sources":[{"listingId":"d9f0e8b6-9017-4d61-b742-c404d819b24d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/84","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:07.012Z","lastSeenAt":"2026-04-26T01:02:58.391Z"}],"details":{"listingId":"d9f0e8b6-9017-4d61-b742-c404d819b24d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/84 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/84"},{"claim":"All endpoints are listed at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching trade data via a single micropayment without needing an API key or subscription","Programmatic access to trade information for automated trading bots or analytics pipelines","Agent-driven data retrieval where per-call payment is preferred over subscription billing"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Use cases requiring low-friction access without registration or API key management"],"notFor":["High-volume consumers who need bulk pricing or rate-limited tiers","Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone unable to pay with USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.92Z"},"updatedAt":"2026-04-26T01:02:58.391Z"}}