{"id":"2f249522-ebad-46db-8419-d0ccd85ee2a6","shortId":"nutdDD","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 platform that gates a broad catalog of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint `/api/v1/trades/77` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled on-chain via USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum amount of 20,000 base units, which equals $0.02 USD (USDC uses 6 decimals). The platform advertises no API keys, no rate limits, and instant access.\n\nThe broader platform offers endpoints across four categories: 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 (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing. However, this specific listing is for `/api/v1/trades/77`, which does not appear in the site's public catalog — its exact functionality is unclear from available documentation.\n\nDocumentation is extremely thin. The /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The endpoint is confirmed live (returns a valid 402 challenge), but what data or service `/api/v1/trades/77` actually returns is not documented.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["finance","data"],"synonyms":["trades API","premium API access","x402 API","micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee"],"warnings":["The endpoint /api/v1/trades/77 is not listed in the site's public API catalog — its purpose is unknown.","All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no content.","No OpenAPI spec, request schema, or response schema is available.","No examples of request or response payloads exist in crawled material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/77","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/77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation for this specific endpoint (/api/v1/trades/77), no request/response schema, no examples, and the endpoint does not appear in the site's public catalog. Docs pages are empty. Functionality must be guessed from the path 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'/api/v1/trades/77':63,168,238 '/docs':192 '/pricing':194 '/readme':196 '/request':17,34,160 '0.02':16,33,95,159 '000':90 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':83 '20':89 '402':231 '6':99 'Base network API' 'USDC API' 'accept':71 'access':69,112 'across':118 'actual':239 'advertis':103 'ai':10,27,128 'amount':87 'analysi':132 'analyt':122 'api':4,21,41,68,105 'appear':172 'avail':185,222 'base':7,24,58,91 'base-network' 'behind':50 'broad':46 'broader':114 'catalog':47,178 'categori':120 'chain':79 'challeng':232 'classif':135 'confirm':226 'connect':202 'content':208 'contract':82 'convers':151 'data':9,26,121,125,235 'decim':100 'document':186,187,217,243 'embed':136 'endpoint':14,31,49,62,117,155,224 'equal':94 'estim':146 'exact':180 'exampl':221 'exchang':141 'export':126 'extrem':189 'feed':140 'financ':11,28,137 'four':119 'function':181 'gas':145 'gate':3,20,44 'generat':152 'geocod':149 'howev':162 'infrastructur':148 'insight':127 'instant':111 'json-response' 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'x402-protocol':38","prices":[{"id":"a9007012-8cf4-450e-bdfa-43556800dc8e","listingId":"2f249522-ebad-46db-8419-d0ccd85ee2a6","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/77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:01.030Z"}],"sources":[{"listingId":"2f249522-ebad-46db-8419-d0ccd85ee2a6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/77","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:01.030Z","lastSeenAt":"2026-04-26T02:03:12.110Z"}],"details":{"listingId":"2f249522-ebad-46db-8419-d0ccd85ee2a6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/77 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <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 valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/77"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/77"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching trade data or trade-related information via a single paid API call","Integrating pay-per-request APIs into agent workflows without managing API keys","Accessing on-demand data services settled via USDC on Base"],"bestFor":["Agents or developers who want keyless, pay-per-call API access","Users who prefer on-chain USDC micropayments over subscription billing","Workflows requiring low-cost single-request data retrieval"],"notFor":["Users needing detailed API documentation or schemas before integration","High-volume use cases where per-request pricing may add up versus flat-rate plans","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.184Z"},"updatedAt":"2026-04-26T02:03:12.110Z"}}