{"id":"5aee61b4-1b70-4794-b290-7d3d968dbafd","shortId":"sxcDGz","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 `/api/v1/trades/46` is listed as \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC, which has 6 decimals = $0.02). Payment is handled via the x402 exact scheme — callers include an X-PAYMENT header with a signed payment to the provider's address, and the endpoint returns JSON.\n\nThe broader platform advertises four categories of APIs: 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 with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific `/api/v1/trades/46` endpoint's purpose is not clearly documented beyond the generic \"Premium API Access\" label. It accepts POST requests and returns application/json. No OpenAPI schema, request body documentation, or response examples were found in the crawled material. The docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no additional content, so the actual functionality behind this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-response","post-method","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["x402 api","micropayment api","pay-per-request api","base network api","usdc api","lowpaymentfee","trades api","premium api access"],"warnings":["No OpenAPI or request/response schema available for this endpoint","Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no content","The purpose and data returned by /api/v1/trades/46 is undocumented — 'Premium API Access' is a generic label","Cannot verify what this endpoint actually does without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/46","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/46","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation of what the /api/v1/trades/46 endpoint actually returns, no request/response schema, and the docs pages are empty. The 'Premium API Access' label is generic and 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'/request':17,34,171 '0.02':16,33,77,92,170 '000':83 '20':82 '6':90 'accept':204 'access':45,72,201 'actual':244 'addit':240 'address':116 'advertis':125 'ai':10,27,137 'analysi':141 'analyt':131 'api':4,21,41,71,129,176,200,229 'application/json':209 'base':7,24,61,84 'base network api' 'behind':51,246 'beyond':196 'bodi':214 'broader':123 'call':79 'caller':101 'categori':127 'classif':144 'clear':194 'commit':184 'connect':235 'content':241 'convers':161 'cost':74 'crawl':223 'data':9,26,130,134 'decim':91 'doc':226 'document':195,215 'embed':145 'endpoint':14,31,50,65,119,164,189,248 'estim':155 'exact':99 'exampl':218 'exchang':150 'export':135 'feed':149 'financ':11,28,146 'found':220 'four':126 'function':245 'gas':154 'gate':3,20,44 'generat':162 'generic':198 'geocod':159 'handl':95 'header':107 'includ':102 'infrastructur':157 'insight':136 'json':121 'json-response' 'key':177 'label':202 'learn':139 'limit':180 'list':68,166 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':138 'marketplac':42 'materi':224 'maxamountrequir':80 'metric':132 'micropay':55 'micropayment api' 'minimum':183 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':211 'page':230 'pay-per-request api' 'payment':93,106,111 'per':53,78 'per-request':52 'per-request-micropayment' 'platform':5,22,124 'point':173 'post':205 'post-method' 'premium':70,199 'premium api access' 'price':148,172,227 'prompt':237 'protocol':40 'provid':114 'purpos':191 'quot':153 'rate':151,179 'remain':249 'render':232 'report':133 'request':54,206,213 'requir':185 'respons':217 'return':120,208 'schema':212 'scheme':100 'sentiment':140 'settl':56 'sign':110 'specif':64,187 'summar':143 'text':142 'token':152 'trades api' 'unclear':250 'unit':85 'usdc':58,87 'usdc api' 'usdc-base' 'util':13,30,158 'valid':160 'varieti':48 'via':96 'wallet':236 'web3':147 'x':105 'x-payment':104 'x402':2,19,39,98 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"5684d811-b555-422c-9af5-fc0d0bc51c1d","listingId":"5aee61b4-1b70-4794-b290-7d3d968dbafd","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/46","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:02.834Z"}],"sources":[{"listingId":"5aee61b4-1b70-4794-b290-7d3d968dbafd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/46","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:02.834Z","lastSeenAt":"2026-04-26T02:03:12.192Z"}],"details":{"listingId":"5aee61b4-1b70-4794-b290-7d3d968dbafd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/46 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","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 maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/46"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/46"},{"claim":"All endpoints listed at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade data or premium content via a single micropayment without needing an API key","Integrating pay-per-call endpoints into AI agent workflows using x402 protocol","Programmatic access to financial or trade-related data settled on Base L2"],"bestFor":["Developers wanting zero-signup, pay-per-request API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing well-documented API contracts with full OpenAPI specs","Applications requiring free or subscription-based access without crypto wallets","High-volume consumers who need bulk pricing or enterprise SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.115Z"},"updatedAt":"2026-04-26T02:03:12.192Z"}}