{"id":"61f45e6b-3035-4dab-b76c-b0d603b5258d","shortId":"v8rvQ8","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/118` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum 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 listed endpoints share the same $0.02/request pricing. However, the specific `/api/v1/trades/118` endpoint does not appear in the site's public catalog, so its exact functionality is unclear — the description simply says \"Premium API Access\" without further detail.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (returns a proper 402 challenge), but what data or service it actually returns upon successful payment is not documented.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["finance","data"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","trades API","premium data access"],"warnings":["The endpoint /api/v1/trades/118 does not appear in the site's public API catalog — its actual functionality is unknown.","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content.","No OpenAPI spec, request schema, or response schema is available.","No examples of successful responses exist in the crawl material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/118","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/118","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific endpoint's purpose is undocumented. The /docs and other pages are empty. This is effectively a stub 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'/api/v1/trades/118':67,172 '/docs':204 '/pricing':206 '/readme':208 '/request':17,34,167 '0.02':16,33,95,166 '000':87 '0x8335':92 '20':86 '402':246 '6':100 'Base network API' 'USDC API' 'accept':75 'access':45,73,195 'actual':254 'advertis':81,122 'ai':10,27,134 'amount':84 'analysi':138 'analyt':128 'api':4,21,41,72,112,194 'appear':176 'avail':234 'base':7,24,61,88 'base-network' 'behind':51 'broader':120 'catalog':182 'categori':124 'challeng':80,247 'classif':141 'confirm':241 'connect':214 'content':220 'convers':158 'crawl':237 'data':9,26,127,131,250 'decim':101 'descript':190 'detail':198 'document':199,229,261 'embed':142 'endpoint':14,31,50,65,126,162,173,239 'equal':94 'estim':152 'exact':108,185 'exampl':233 'exchang':147 'export':132 'extrem':201 'feed':146 'financ':11,28,143 'four':123 'function':186 'gas':151 'gate':3,20,44 'generat':159 'geocod':156 'howev':169 'infrastructur':154 'insight':133 'key':113 'learn':136 'limit':115 'list':69,161 'live':242 'lowpaymentfee' 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'x402':2,19,39,79,107 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"07a3e97e-a9d5-42d5-8435-e937b0dc4bc2","listingId":"61f45e6b-3035-4dab-b76c-b0d603b5258d","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/118","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:31.575Z"}],"sources":[{"listingId":"61f45e6b-3035-4dab-b76c-b0d603b5258d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/118","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:31.575Z","lastSeenAt":"2026-04-26T09:03:50.134Z"}],"details":{"listingId":"61f45e6b-3035-4dab-b76c-b0d603b5258d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/118 \\\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 advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/118"},{"claim":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/118"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade data or premium content behind a single $0.02 USDC micropayment","Integrating pay-per-call API access into autonomous agents without API key management","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 who need detailed API documentation or OpenAPI specs 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":"2026-02-17T23:13:46.583Z"},"updatedAt":"2026-04-26T09:03:50.134Z"}}