{"id":"917149e4-d628-4899-b903-83c90466be9f","shortId":"Muwkcb","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 a collection of pay-per-call APIs gated via the x402 protocol on the Base network. The specific endpoint `/api/v1/trades/78` 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 — equivalent to $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com 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 utilities (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request.\n\nHowever, the specific `/api/v1/trades/78` endpoint does not clearly map to any of the documented categories on the landing page. There is no dedicated documentation, request/response schema, or example payloads available for this particular route. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content. As a result, the exact functionality of this endpoint remains unclear beyond its generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-gateway","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","trades endpoint","premium API"],"warnings":["The endpoint path /api/v1/trades/78 does not appear in the provider's own listed API catalog — its exact functionality is unknown.","No request body schema or response schema is documented anywhere.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content.","The purpose of the numeric ID '78' in the path is unexplained."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/78","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/78","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 it accepts USDC payments on Base at $0.02 per call. However, there is no documentation, no request/response schema, no examples, and the specific /api/v1/trades/78 route is not listed among the documented endpoints on the landing page. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'0.02':10,28,93,172 '000':88 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':79 '20':87 '6':98 'Base network API' 'USDC micropayment API' 'accept':70 'access':6,24,68,242 'across':130 'addit':224 'advertis':128 'ai':140 'amount':85 'analysi':144 'analyt':134 'api':5,16,23,34,49,67,101,213,241 'attach':112 'avail':204 'base':8,26,57,81,89 'base-network' 'beyond':237 'broader':125 'call':48 'caller':110 'categori':132,189 'classif':147 'clear':182 'collect':43 'commit':107 'connect':219 'content':225 'contract':78 'convers':164 'data':133,137 'decim':99 'dedic':197 'doc':210 'document':188,198 'embed':148 'endpoint':38,61,129,167,179,234 'equival':91 'estim':158 'exact':230 'exampl':202 'exchang':153 'export':138 'feed':152 'financ':149 'four':131 'function':231 'gas':157 'gate':3,21,50 'generat':165 'generic':239 'geocod':162 'header':117 'howev':175 'infrastructur':160 'insight':139 'json-response' 'key':17,35,102 'label':243 'land':192 'learn':142 'limit':104 'list':64 'lowpaymentfee' 'lowpaymentfee.com':40,126 'machin':141 'map':183 'maximum':84 'metric':135 'network':58 'no-api-key' 'page':193,214 'particular':207 'pay':9,27,46 'pay-per-cal':45 'pay-per-call API' 'pay-per-request' 'payload':203 'payment':73,116,122 'per':11,29,47,94,173 'platform':127 'post':71 'post-endpoint' 'premium':4,22,66,240 'premium API' 'price':151,170,211 'prompt':221 'proof':123 'protocol':54 'provid':41 'quot':156 'rate':103,154 'remain':235 'render':216 'report':136 'request':12,30,72,95,174 'request/response':199 'requir':18,36,109 'result':228 'rout':208 'schema':200 'sentiment':143 'settl':75 'simpli':111 'specif':60,177 'summar':146 'text':145 'token':155 'trades endpoint' 'unclear':236 'uniform':169 'unit':90 'upfront':106 'usdc':14,32,77,96 'usdc-settlement' 'use':97 'util':161 'valid':120,163 'via':51 'wallet':220 'web3':150 'x':115 'x-payment':114 'x402':2,20,53,121 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"f99c40ea-7014-4c44-8f6c-c510c493e930","listingId":"917149e4-d628-4899-b903-83c90466be9f","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/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:05.197Z"}],"sources":[{"listingId":"917149e4-d628-4899-b903-83c90466be9f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/78","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:05.197Z","lastSeenAt":"2026-04-22T13:31:42.868Z"}],"details":{"listingId":"917149e4-d628-4899-b903-83c90466be9f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/78 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 USDC payment on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/trades/78"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/78"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium trade data or executing trade-related operations via a single paid POST call","Integrating pay-per-request APIs into agent workflows without managing API keys","Settling micro-transactions for API access using USDC on Base"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing 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":"2026-02-17T23:13:44.999Z"},"updatedAt":"2026-04-22T13:31:42.868Z"}}