{"id":"078e3869-9595-4d1d-847a-ad5c9032d7f9","shortId":"AXaR5L","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 a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/trades/34` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum cost 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/34` endpoint does not clearly map to any of these advertised categories — it may be a trade-specific data endpoint or a demonstration resource.\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 schema, no request/response examples, and no description of what the `/api/v1/trades/34` endpoint actually returns. The endpoint is confirmed live (402 challenge captured), but without documentation it is difficult to know what data or functionality it provides.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["data","finance"],"synonyms":["micropayment API","pay-per-call API","x402 API","USDC API","Base network API","low fee API","trades API","premium data endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format for /api/v1/trades/34","The endpoint path '/api/v1/trades/34' does not match any of the advertised API categories on the landing page","Purpose and return data of this specific endpoint are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/34","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/34","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of `/api/v1/trades/34` is unclear. The docs pages are all empty wallet-connect 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'live':239 'low fee API' 'lowpaymentfee.com':35 'machin':133 'made':102 'map':175 'marketplac':42 'maximum':81 'may':183 'metric':127 'micropay':53 'micropayment API' 'network':60 'no-api-key' 'offer':8,25 'openapi':220 'page':205 'pay-per-call API' 'payment':100 'per':51,94 'per-request':50 'per-request-billing' 'platform':5,22,119 'post':74 'post-endpoint' 'premium':69 'premium data endpoint' 'price':143,166 'prompt':212 'protocol':40 'provid':256 'quot':148 'rate':112,146 'render':207 'report':128 'request':52,75,95 'request/response':223 'requir':116 'resourc':194 'return':234 'schema':221 'scheme':107 'sentiment':135 'settl':54 'share':161 'spars':198 'specif':62,169,188 'subscript':115 'substant':215 'summar':138 'text':137 'token':147 'trade':187 'trade-specif':186 'trades API' 'unit':87 'usdc':56,89,96 'usdc-micropayment' 'use':97 'util':13,30,153 'valid':155 'varieti':46 'via':103 'wallet':211 'web3':142 'without':244 'x402':2,19,39,77,105 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"684d1e29-8f60-419f-bc79-f44690b84ec8","listingId":"078e3869-9595-4d1d-847a-ad5c9032d7f9","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/34","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:49.155Z"}],"sources":[{"listingId":"078e3869-9595-4d1d-847a-ad5c9032d7f9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/34","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:49.155Z","lastSeenAt":"2026-04-26T04:03:40.796Z"}],"details":{"listingId":"078e3869-9595-4d1d-847a-ad5c9032d7f9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/34 \\\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/34"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade data or premium content via a single micropayment per request","Integrating pay-per-use API calls into agent workflows without managing API keys","Programmatic access to data endpoints settled on Base L2 with USDC"],"bestFor":["Developers wanting keyless, pay-per-request API access","AI agents that can settle x402 micropayments on Base","Users who prefer crypto-native billing without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.741Z"},"updatedAt":"2026-04-26T04:03:40.796Z"}}