{"id":"341c3d57-87a7-45ea-8988-89af6fef92e5","shortId":"hNBwct","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","description":"lowpaymentfee.com is a platform offering a suite of pay-per-call API endpoints gated by the x402 protocol on the Base network. The specific endpoint `/api/v1/trades/146` is listed as \"Premium API Access\" and returns a 402 challenge requesting payment in USDC (contract 0x8335…2913 on Base). The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. Payment is made via the x402 \"exact\" scheme, with a 300-second timeout window.\n\nThe broader platform advertises 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 endpoints are listed at the same $0.02/request price point. The platform emphasizes no API keys, no rate limits, and instant access.\n\nHowever, the specific `/api/v1/trades/146` endpoint does not clearly map to any of the documented categories on the landing page. There is no OpenAPI schema, no detailed documentation for request/response formats, and the crawled docs/pricing/API pages returned only a \"Connect wallet\" prompt with no additional content. The actual functionality behind this particular endpoint is unclear — the name \"trades/146\" suggests it may relate to a specific trade record or financial data resource, but this is speculative.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","http-post"],"categories":["finance","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-gated API","trades API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The endpoint path /api/v1/trades/146 does not appear in the platform's listed API catalog — its actual functionality is unknown","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no substantive content","Request and response formats are entirely undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/146","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/146","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response documentation, no examples, and the docs/pricing/API pages are empty beyond a wallet connect prompt. The specific purpose of /api/v1/trades/146 is unclear and does not match any documented endpoint on the landing 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'lowpaymentfee' 'lowpaymentfee.com':39 'machin':135 'made':107 'map':190 'maximum':87 'may':241 'metric':129 'name':237 'network':61 'no-api-key' 'offer':43 'openapi':204 'page':200,216 'particular':232 'pay':9,28,48 'pay-per-cal':47 'pay-per-call API' 'pay-per-request' 'payment':78,105 'per':11,30,49,90 'platform':42,121,171 'point':169 'premium':4,23,69 'price':145,168 'prompt':222 'protocol':57 'quot':150 'rate':18,37,148,177 'record':247 'relat':242 'report':130 'request':12,31,77 'request/response':210 'requir':89 'resourc':251 'return':73,217 'schema':205 'scheme':112 'second':116 'sentiment':137 'specif':63,184,245 'specul':255 'suggest':239 'suit':45 'summar':140 'text':139 'timeout':117 'token':149 'trade':246 'trades API' 'trades/146':238 'unclear':235 'unit':96 'usd':104 'usdc':14,33,80,98 'usdc-base' 'valid':156 'via':108 'wallet':221 'web3':144 'window':118 'x402':2,21,56,110 'x402 API' 'x402-gated':1,20 'x402-payment'","prices":[{"id":"b9a1be49-6a04-4e9b-83c9-5717aacf3447","listingId":"341c3d57-87a7-45ea-8988-89af6fef92e5","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/146","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:45.051Z"}],"sources":[{"listingId":"341c3d57-87a7-45ea-8988-89af6fef92e5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/146","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:45.051Z","lastSeenAt":"2026-04-26T05:32:45.814Z"}],"details":{"listingId":"341c3d57-87a7-45ea-8988-89af6fef92e5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/146 \\\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 endpoint returns a 402 challenge requesting 20000 base units of USDC on Base network with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/trades/146"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/146"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching trade or financial data behind a per-request USDC paywall","Agent-driven API consumption without pre-registration or API keys","Programmatic access to premium data with crypto micropayments"],"bestFor":["Agents or bots that need keyless, on-demand API access settled in USDC on Base","Developers exploring x402 protocol integrations","Low-friction pay-per-use data retrieval without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.963Z"},"updatedAt":"2026-04-26T05:32:45.814Z"}}