{"id":"a89daf8c-d6dd-4d3c-bf2e-9f85bc2cab01","shortId":"ydgujb","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 collection of x402-protocol pay-per-call API endpoints hosted on the Base network. The specific endpoint at `/api/v1/trades/97` 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 no API keys or rate limits required.\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 (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request.\n\nThe specific `/api/v1/trades/97` endpoint's purpose is not well-documented beyond the generic \"Premium API Access\" label. It accepts POST requests and returns `application/json`. No OpenAPI schema, request body documentation, or response examples were found in the crawl. The docs, pricing, API, and README pages all rendered only a \"Connect wallet\" prompt with no additional content, making it impossible to determine the exact data this particular endpoint returns.","tags":[],"capabilities":["x402-payment","per-call-billing","usdc-settlement","base-network","json-response","no-api-key","post-method"],"categories":["finance","data"],"synonyms":["trades API","premium API","pay-per-call API","x402 endpoint","USDC micropayment API","lowpaymentfee","Base network API"],"warnings":["No documentation available — all doc pages render only a 'Connect wallet' prompt","The specific purpose and response format of /api/v1/trades/97 is undocumented","No OpenAPI spec or request/response schema found","The endpoint name 'Premium API Access' is generic and uninformative"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/97","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/97","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). However, there is no documentation for what /api/v1/trades/97 actually returns, no request/response schema, and all doc pages render only 'Connect wallet'. The endpoint's purpose is essentially unknown beyond its generic 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'0.02':10,29,100,165 '000':91 '0x8335':79 '20':90 '2913':80 '402':72 '6':96 'Base network API' 'USDC micropayment API' 'accept':187 'access':6,25,68,184 'across':124 'addit':223 'advertis':122 'ai':134 'amount':85 'analysi':138 'analyt':128 'api':5,24,51,67,112,183,210 'application/json':192 'base':8,27,56,82,92 'base-network' 'beyond':179 'bodi':197 'broader':119 'call':50,88 'categori':126 'challeng':73 'classif':141 'collect':42 'connect':218 'content':224 'contract':78 'convers':157 'crawl':206 'data':127,131,232 'decim':97 'determin':229 'doc':208 'document':178,198 'embed':142 'endpoint':52,60,123,160,171,235 'equal':99 'estim':152 'exact':108,231 'exampl':201 'exchang':147 'export':132 'feed':146 'financ':143 'found':203 'four':125 'gas':151 'gate':3,22 'generat':158 'generic':181 'geocod':155 'host':53 'imposs':227 'infrastructur':154 'insight':133 'json-response' 'key':16,35,113 'label':185 'learn':136 'limit':19,38,116 'list':64 'lowpaymentfee' 'lowpaymentfee.com':39,120 'machin':135 'made':104 'make':225 'maximum':84 'metric':129 'network':57 'no-api-key' 'openapi':194 'page':213 'particular':234 'pay':9,28,48 'pay-per-cal':47 'pay-per-call API' 'payment':75,102 'per':11,30,49,87,166 'per-call-billing' 'platform':121 'post':188 'post-method' 'premium':4,23,66,182 'premium API' 'price':145,163,209 'prompt':220 'protocol':46 'purpos':173 'quot':150 'rate':18,37,115,148 'readm':212 'render':215 'report':130 'request':12,31,74,167,189,196 'requir':86,117 'respons':200 'return':70,191,236 'schema':195 'scheme':109 'sentiment':137 'specif':59,169 'summar':140 'text':139 'token':149 'trades API' 'uniform':162 'unit':93 'usd':101 'usdc':14,33,77,95 'usdc-settlement' 'valid':156 'via':105 'wallet':219 'web3':144 'well':177 'well-docu':176 'x402':2,21,45,107 'x402 endpoint' 'x402-gated':1,20 'x402-payment' 'x402-protocol':44","prices":[{"id":"745b9bc7-7be8-46c1-a808-b60d149114f6","listingId":"a89daf8c-d6dd-4d3c-bf2e-9f85bc2cab01","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/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:13.117Z"}],"sources":[{"listingId":"a89daf8c-d6dd-4d3c-bf2e-9f85bc2cab01","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/97","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:13.117Z","lastSeenAt":"2026-04-25T23:32:43.506Z"}],"details":{"listingId":"a89daf8c-d6dd-4d3c-bf2e-9f85bc2cab01","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/97 \\\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 requesting 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/97"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/97"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching trade-related data on a pay-per-call basis without managing API keys","Agent-driven workflows that need instant API access with crypto micropayments","Integrating low-cost data endpoints into automated pipelines settled on Base"],"bestFor":["Developers who want keyless, pay-as-you-go API access","AI agents with USDC wallets on Base that need on-demand data","Prototyping and low-volume usage where subscription plans are overkill"],"notFor":["High-volume production workloads where per-call pricing adds up quickly","Users without a Base-compatible USDC wallet","Anyone needing detailed API documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.622Z"},"updatedAt":"2026-04-25T23:32:43.506Z"}}