{"id":"4dbda349-d2f1-498e-9366-cec187faf1e2","shortId":"f7r3Uu","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":"This endpoint at lowpaymentfee.com provides a collection of pay-per-request APIs gated via the x402 protocol on the Base network. The specific endpoint `/api/v1/trades/64` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, with a maximum amount of 20,000 base units — which at 6 decimals equals $0.02 per call.\n\nThe broader lowpaymentfee.com platform advertises multiple API categories including 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 endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nHowever, the specific `/api/v1/trades/64` endpoint does not appear in the site's publicly listed API catalog, and no documentation describes what data or functionality it returns. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. Without schema details or example responses, the actual behavior of this particular endpoint remains 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","premium API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["The /api/v1/trades/64 endpoint is not listed in the site's public API catalog — its purpose and response format are undocumented.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content.","No OpenAPI spec, no request/response schema, and no example payloads are available.","The endpoint's actual data or functionality cannot be verified without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/64","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/64","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, the specific /api/v1/trades/64 path is not documented anywhere on the site, there is no OpenAPI schema, no example request/response, and all documentation pages render only a wallet-connect prompt. The actual functionality of this endpoint is 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'0.02':10,29,98,148 '000':90 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':81 '20':89 '6':95 'Base network API' 'USDC micropayment API' 'accept':72 'access':6,25,70 'actual':213 'advertis':105 'ai':117 'amount':87 'analysi':121 'analyt':111 'api':5,24,51,69,107,153,177,193 'appear':170 'base':8,27,59,83,91 'base-network' 'behavior':214 'broader':102 'call':100 'catalog':178 'categori':108 'classif':124 'collect':45 'commit':161 'connect':199 'content':205 'contract':80 'convers':141 'data':110,114,184 'decim':96 'describ':182 'detail':208 'doc':190 'document':181 'embed':125 'endpoint':40,63,144,167,218 'equal':97 'estim':135 'exampl':210 'exchang':130 'export':115 'feed':129 'financ':126 'function':186 'gas':134 'gate':3,22,52 'generat':142 'geocod':139 'howev':163 'includ':109 'infrastructur':137 'insight':116 'json-response' 'key':16,35,154 'learn':119 'limit':19,38,157 'list':66,176 'lowpaymentfee' 'lowpaymentfee.com':42,103 'machin':118 'maximum':86 'metric':112 'minimum':160 'multipl':106 'network':60 'no-api-key' 'page':194 'particular':217 'pay':9,28,48 'pay-per-call API' 'pay-per-request':47 'payment':75 'per':11,30,49,99,149 'platform':104 'post':73 'post-endpoint' 'premium':4,23,68 'premium API' 'price':128,146,191 'prompt':201 'protocol':56 'provid':43 'public':175 'quot':133 'rate':18,37,131,156 'remain':219 'render':196 'report':113 'request':12,31,50,74,150 'requir':162 'respons':211 'return':188 'schema':207 'sentiment':120 'settl':77 'site':173 'specif':62,165 'summar':123 'text':122 'token':132 'trades API' 'unclear':220 'unit':92 'usdc':14,33,79 'usdc-settlement' 'util':138 'valid':140 'via':53 'wallet':200 'web3':127 'without':206 'x402':2,21,55 'x402 API' 'x402-gated':1,20 'x402-payment'","prices":[{"id":"fe7a12c1-3165-4767-bdc9-c69f5f16b3b7","listingId":"4dbda349-d2f1-498e-9366-cec187faf1e2","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/64","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:05.799Z"}],"sources":[{"listingId":"4dbda349-d2f1-498e-9366-cec187faf1e2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/64","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:05.799Z","lastSeenAt":"2026-04-26T02:03:12.324Z"}],"details":{"listingId":"4dbda349-d2f1-498e-9366-cec187faf1e2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/64 \\\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 x402 challenge returns maxAmountRequired of 20000 in USDC (6 decimals) on Base, equaling $0.02 per request.","source_url":"https://lowpaymentfee.com/api/v1/trades/64"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.","source_url":"https://lowpaymentfee.com/api/v1/trades/64"},{"claim":"The site lists API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade-related data via a single micropayment per request","Integrating pay-per-use API calls into autonomous agent workflows","Consuming premium data without managing API keys or subscriptions"],"bestFor":["Agents or developers who want keyless, pay-per-request API access","x402-compatible wallets and clients on Base","Low-volume or sporadic API consumers who prefer no commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.958Z"},"updatedAt":"2026-04-26T02:03:12.324Z"}}