{"id":"245b3b56-8c6c-44c5-93c7-71086d4b8da0","shortId":"CZ4C4L","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol on the Base network. The specific resource `/api/v1/trades/63` appears to be part of a broader platform offering dozens of pay-per-call endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request in USDC.\n\nThe x402 challenge confirms the endpoint is live and accepts exact-scheme payments in USDC (contract `0x8335…2913` on Base) with a max amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). Payment is made via the `X-PAYMENT` header; no API keys, rate limits, or subscriptions are required. The timeout for payment settlement is 300 seconds.\n\nWhile the landing page lists many endpoint categories (analytics, AI, finance, utilities), the specific `/api/v1/trades/63` path is not explicitly documented on the site. It falls under a \"trades\" namespace that isn't listed among the advertised categories. No OpenAPI schema, request/response examples, or detailed documentation were found — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. The actual data returned by this endpoint and what input it expects (beyond being a POST) remain unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["finance","data"],"synonyms":["trades API","x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium data endpoint","crypto payment API"],"warnings":["The /api/v1/trades/63 path is not listed among the advertised endpoints on the landing page — its purpose is unclear.","No documentation, OpenAPI spec, or example payloads are available; docs/pricing/API pages all show only 'Connect wallet'.","The broader platform lists many endpoint categories but none appear to have public documentation beyond the landing page listing.","Cannot verify what data this endpoint actually returns without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/63","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/63","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 the specific /api/v1/trades/63 path is undocumented. No OpenAPI schema, no request/response examples, and all doc pages render only 'Connect wallet'. The actual functionality of this endpoint is 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'0.02':10,28,87,124 '000':119 '0x8335':109 '20':118 '2913':110 '300':153 '6':127 'Base network API' 'USDC micropayment API' 'accept':101 'access':6,24,44 'actual':220 'advertis':190 'ai':164 'ai/ml':77 'among':188 'amount':116 'analyt':76,163 'api':5,16,23,34,43,139,206 'appear':58 'base':8,26,52,112,120 'base-network' 'beyond':231 'broader':64 'call':72 'categori':162,191 'challeng':94 'confirm':95 'connect':212 'content':218 'contract':108 'crypto payment API' 'data':75,80,221 'decim':128 'detail':198 'doc':203 'document':174,199 'dozen':67 'endpoint':38,73,97,161,225 'equal':123 'exact':103 'exact-schem':102 'exampl':196 'expect':230 'explicit':173 'fall':179 'financ':165 'finance/web3':79 'found':201 'gate':3,21 'header':137 'infer':78 'infrastructur':82 'input':228 'isn':185 'json-response' 'key':17,35,140 'land':157 'limit':142 'list':159,187 'live':99 'lowpaymentfee' 'lowpaymentfee.com':40 'made':131 'mani':160 'max':115 'namespac':183 'network':53 'no-api-key' 'offer':66 'openapi':193 'page':158,207 'part':61 'path':170 'pay':9,27,70 'pay-per-cal':69 'pay-per-call API' 'pay-per-request' 'payment':48,105,129,136,150 'per':11,29,71,88 'platform':65 'post':234 'post-endpoint' 'premium':4,22,42 'premium data endpoint' 'price':85,204 'prompt':214 'protocol':49 'provid':41 'rate':141 'remain':235 'render':209 'request':12,30,89 'request/response':195 'requir':18,36,146 'resourc':56 'return':222 'schema':194 'scheme':104 'second':154 'settlement':151 'site':177 'span':74 'specif':55,168 'subscript':144 'timeout':148 'trade':182 'trades API' 'unclear':236 'unit':121 'usdc':14,32,91,107,125 'usdc-settlement' 'use':126 'util':83,166 'via':45,132 'wallet':213 'x':135 'x-payment':134 'x402':2,20,47,93 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"a2bbf294-392d-4374-b44c-8ae54f3c4ecc","listingId":"245b3b56-8c6c-44c5-93c7-71086d4b8da0","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/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:01.619Z"}],"sources":[{"listingId":"245b3b56-8c6c-44c5-93c7-71086d4b8da0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/63","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:01.619Z","lastSeenAt":"2026-04-26T02:03:12.110Z"}],"details":{"listingId":"245b3b56-8c6c-44c5-93c7-71086d4b8da0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/63 \\\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 x402 challenge with maxAmountRequired of 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/63"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/63"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching trade-related data with per-request USDC micropayments","Integrating pay-as-you-go API access into autonomous agents on Base","Accessing premium data without managing API keys or subscriptions"],"bestFor":["Agents or bots that can settle x402 payments in USDC on Base","Developers wanting zero-commitment, pay-per-call API access","Use cases where avoiding API key management is valuable"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Applications requiring high-throughput access where per-call fees add up quickly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.184Z"},"updatedAt":"2026-04-26T02:03:12.110Z"}}