{"id":"9e52a8e4-3fc7-4f28-9dfc-41f281ff29d5","shortId":"ZFdK8e","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 access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint `/api/v1/trades/69` is listed as \"Premium API Access\" and accepts POST requests. Payment is handled via the x402 exact scheme — callers include an X-PAYMENT header and pay up to $0.02 per request (maxAmountRequired of 20,000 base units of USDC, which has 6 decimals = $0.02). No API keys, rate limits, or upfront commitments are 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 are listed at the same $0.02/request price point. However, the specific `/api/v1/trades/69` endpoint's functionality is not clearly documented — it falls outside the categories listed on the landing page, so its exact behavior is uncertain.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response examples, and no detailed endpoint documentation available from the crawl.","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","Base USDC API","trades endpoint","lowpaymentfee","402 payment API"],"warnings":["The specific endpoint /api/v1/trades/69 is not listed among the advertised API categories on the landing page — its exact functionality is unknown.","No documentation is available: /docs, /api, /pricing, and /README all render only 'Connect wallet' with no content.","No OpenAPI spec or request/response schema is provided.","No example responses are available to verify what data this endpoint returns."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/69","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/69","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific endpoint's purpose (trades/69) is undocumented. All secondary pages return only a wallet-connect 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'/api/v1/trades/69':66,176 '/docs':205 '/pricing':207 '/readme':209 '/request':17,34,170 '0.02':16,33,96,111,169 '000':102 '20':101 '402 payment API' '6':109 'Base USDC API' 'accept':74 'access':45,72 'addit':220 'advertis':125 'ai':10,27,137 'analysi':141 'analyt':131 'api':4,21,41,71,113 'avail':235 'base':7,24,61,103 'behavior':197 'behind':51 'broader':123 'caller':85 'categori':127,188 'classif':144 'clear':182 'commit':119 'connect':215 'content':221 'convers':161 'crawl':238 'data':9,26,130,134 'decim':110 'detail':232 'document':183,200,234 'embed':145 'endpoint':14,31,50,65,129,177,233 'estim':155 'exact':83,196 'exampl':229 'exchang':150 'export':135 'extrem':202 'fall':185 'feed':149 'financ':11,28,146 'four':126 'function':179 'gas':154 'gate':3,20,44 'generat':162 'geocod':159 'handl':79 'header':91 'howev':173 'includ':86 'infrastructur':157 'insight':136 'json-response' 'key':114 'land':192 'learn':139 'limit':116 'list':68,165,189 'lowpaymentfee' 'lowpaymentfee.com':35 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'x402-protocol':38","prices":[{"id":"ca8c5463-9aa9-4c0b-b8b2-bfa95ae6e4d9","listingId":"9e52a8e4-3fc7-4f28-9dfc-41f281ff29d5","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/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:05.807Z"}],"sources":[{"listingId":"9e52a8e4-3fc7-4f28-9dfc-41f281ff29d5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/69","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:05.807Z","lastSeenAt":"2026-04-26T02:03:12.325Z"}],"details":{"listingId":"9e52a8e4-3fc7-4f28-9dfc-41f281ff29d5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/69 \\\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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/69"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/69"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Four API categories are listed: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade data or executing trade-related queries via a single paid API call","Integrating pay-per-use API access into autonomous agents without managing API keys","Programmatic access to premium data behind x402 micropayment gating"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk/subscription pricing","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.965Z"},"updatedAt":"2026-04-26T02:03:12.325Z"}}