{"id":"9d9f5b1b-919f-4de6-b1ed-a2e7b740d4c0","shortId":"pxbjGy","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 micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/trades/47` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which at 6 decimals equals $0.02 per request — consistent with the site's uniform $0.02/request pricing.\n\nThe platform organizes its APIs into 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 endpoints are advertised at the same $0.02 price point with no API keys, no rate limits, and instant access.\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 detailed documentation for any endpoint, including the `/api/v1/trades/47` endpoint being listed here. The specific purpose of the \"trades/47\" resource is unclear from available materials; it does not appear in the site's main catalog of endpoints, suggesting it may be an unlisted or specialized resource.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-api","json-response","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","trades API","lowpaymentfee"],"warnings":["The /api/v1/trades/47 endpoint does not appear in the site's public API catalog — its specific function is undocumented.","All documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt with no useful content.","No OpenAPI schema, no request/response examples, and no detailed endpoint documentation are available.","The platform lists many endpoint categories but provides no evidence that any return substantive data — exercise caution."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/47","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/47","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 OpenAPI schema, no request/response examples, no documentation beyond a wallet-connect prompt, and the specific /api/v1/trades/47 endpoint is not listed in the site's own catalog. The purpose of this endpoint is essentially 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'/api/v1/trades/47':66,211 '/docs':177 '/pricing':179 '/readme':181 '/request':17,34,110 '0.02':16,33,100,109,159 '000':86 '0x8335':91 '20':85 '2913':92 '6':97 'Base network API' 'USDC API' 'accept':74 'access':72,171 'advertis':80,155 'ai':10,27,127 'amount':83 'analysi':131 'analyt':121 'api':4,21,41,71,116,164 'appear':231 'avail':226 'base':7,24,60,87,94 'behind':50 'broad':46 'catalog':47,237 'categori':119 'challeng':79 'classif':134 'connect':187 'consist':103 'content':193 'convers':150 'data':9,26,120,124 'decim':98 'detail':204 'document':172,205 'embed':135 'endpoint':14,31,49,64,153,208,212,239 'equal':99 'estim':145 'exampl':201 'exchang':140 'export':125 'extrem':174 'feed':139 'financ':11,28,136 'four':118 'gas':144 'gate':3,20,44 'generat':151 'geocod':148 'includ':209 'infrastructur':147 'insight':126 'instant':170 'json-response' 'key':165 'learn':129 'limit':168 'list':68,214 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':128 'main':236 'materi':227 'max':82 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'x402-protocol':38","prices":[{"id":"87d07266-d770-456e-959d-13c73b7a3427","listingId":"9d9f5b1b-919f-4de6-b1ed-a2e7b740d4c0","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/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:05.835Z"}],"sources":[{"listingId":"9d9f5b1b-919f-4de6-b1ed-a2e7b740d4c0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/47","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:05.835Z","lastSeenAt":"2026-04-26T02:03:12.325Z"}],"details":{"listingId":"9d9f5b1b-919f-4de6-b1ed-a2e7b740d4c0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/47 \\\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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/trades/47"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists endpoints across 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 data or executing trade-related queries via a single paid API call","Agent-driven workflows that need low-friction, keyless API access with crypto micropayments","Programmatic access to premium data without subscription commitments"],"bestFor":["Developers or agents who want pay-per-call API access without API key management","Crypto-native applications that can settle USDC payments on Base","Low-volume or sporadic usage patterns where subscriptions are wasteful"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.958Z"},"updatedAt":"2026-04-26T02:03:12.325Z"}}