{"id":"f3840ab5-1300-4ac9-a962-b876201ff181","shortId":"er4gqL","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/194` 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 upfront commitments 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 listed endpoints share the same $0.02/request pricing.\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 detailed documentation for any endpoint, including the `/api/v1/trades/194` endpoint being listed here. The specific purpose of the \"trades/194\" endpoint is unclear from available materials; it may relate to the Finance & Web3 category but this is speculative.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-endpoint","json-response","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["premium API access","trades API","x402 micropayment API","pay-per-request API","Base USDC API","lowpaymentfee"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema definition for any endpoint, including /api/v1/trades/194.","The specific purpose and expected input/output of the /api/v1/trades/194 endpoint is unknown.","The endpoint path suggests a resource ID (194) but no context is provided for what 'trades' refers to."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/194","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/194","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, no OpenAPI schema, no request/response examples, and the specific function of /api/v1/trades/194 is unexplained. The docs pages are empty beyond a wallet-connect 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'/api/v1/trades/194':67,209 '/docs':175 '/pricing':177 '/readme':179 '/request':17,34,168 '0.02':16,33,95,167 '000':87 '0x8335':92 '20':86 '6':100 'Base USDC API' 'accept':75 'access':45,73 'advertis':123 'ai':10,27,135 'amount':84 'analysi':139 'analyt':129 'api':4,21,41,72,112 'avail':224 'base':7,24,61,88 'behind':51 'broader':121 'categori':125,233 'challeng':80 'classif':142 'commit':118 'connect':185 'content':191 'convers':159 'data':9,26,128,132 'decim':101 'detail':202 'document':170,203 'embed':143 'endpoint':14,31,50,65,127,163,206,210,220 'equal':94 'estim':153 'exact':108 'exampl':199 'exchang':148 'export':133 'extrem':172 'feed':147 'financ':11,28,144,231 'four':124 'gas':152 'gate':3,20,44 'generat':160 'geocod':157 'includ':207 'indic':81 'infrastructur':155 'insight':134 'json-response' 'key':113 'learn':137 'limit':115 'list':69,162,212 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':136 'made':104 'marketplac':42 'materi':225 'max':83 'may':227 'metric':130 'micropay':55 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':195 'page':180 'pay-per-request API' 'payment':102 'per':53,96 'per-request':52 'per-request-micropayment' 'platform':5,22,122 'post':76 'post-endpoint' 'premium':71 'premium API access' 'price':146,169 'prompt':187 'protocol':40 'purpos':216 'quot':151 'rate':114,149 'relat':228 'render':182 'report':131 'request':54,77,97 'request/response':198 'requir':119 'schema':196 'scheme':109 'sentiment':138 'settl':56 'share':164 'spars':173 'specif':64,215 'specul':237 'summar':141 'text':140 'token':150 'trades API' 'trades/194':219 'unclear':222 'unit':89 'upfront':117 'usdc':58,91,98 'usdc-base' 'use':99 'util':13,30,156 'valid':158 'varieti':48 'via':105 'wallet':186 'web3':145,232 'x402':2,19,39,79,107 'x402 micropayment API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"812c3ec6-d92c-4746-bf45-118935787518","listingId":"f3840ab5-1300-4ac9-a962-b876201ff181","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/194","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:56.276Z"}],"sources":[{"listingId":"f3840ab5-1300-4ac9-a962-b876201ff181","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/194","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:56.276Z","lastSeenAt":"2026-04-26T03:03:00.101Z"}],"details":{"listingId":"f3840ab5-1300-4ac9-a962-b876201ff181","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/194 \\\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/194"},{"claim":"All listed endpoints are priced 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 endpoints in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure 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":["Accessing trade-related data via a single micropayment without subscription","Programmatic agents purchasing API data on-demand with USDC on Base","Integrating pay-per-call endpoints into automated workflows"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional API key subscriptions"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.386Z"},"updatedAt":"2026-04-26T03:03:00.101Z"}}