{"id":"d94aa4d8-b9f2-43e9-8522-2f311164a504","shortId":"jKXuyq","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 marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/trades/154` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a max amount of 20,000 base units of USDC (0x8335…), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 exact scheme with no API keys, rate limits, or subscriptions 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 listed endpoints share the same $0.02/request pricing. However, documentation beyond the landing page is effectively empty — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content.\n\nThe `/api/v1/trades/154` endpoint itself does not clearly map to any of the advertised categories. It may represent a specific trade record lookup or a finance-related endpoint, but without documentation or schema details, its exact functionality is uncertain. The endpoint is confirmed live via a valid 402 challenge response, and the output MIME type is `application/json`.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-api","post-method","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["micropayment API","pay-per-call API","x402 endpoint","USDC API","Base network API","lowpaymentfee","trades API","premium API access"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) are effectively empty — only showing 'Connect wallet'","No OpenAPI or schema available for any endpoint","The specific function of /api/v1/trades/154 is undocumented and unclear — it does not match any of the advertised endpoint categories","No request body schema or response examples are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/154","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/154","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and documentation pages are empty beyond a wallet connect prompt. The specific purpose of /api/v1/trades/154 is 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'/request':17,34,167 '0.02':16,33,95,166 '000':87 '0x8335':92 '20':86 '402':243 '6':100 'Base network API' 'USDC API' 'accept':75 'access':45,73 'advertis':122,208 'ai':10,27,134 'amount':84 'analysi':138 'analyt':128 'api':4,21,41,72,112,180 'application/json':252 'base':7,24,61,88 'behind':51 'beyond':171 'broader':120 'categori':124,209 'challeng':80,244 'classif':141 'clear':202 'confirm':238 'connect':189 'content':195 'convers':158 'data':9,26,127,131 'decim':101 'detail':229 'doc':179 'document':170,226 'effect':176 'embed':142 'empti':177 'endpoint':14,31,50,65,126,162,198,223,236 'equal':94 'estim':152 'exact':108,231 'exchang':147 'export':132 'feed':146 'financ':11,28,143,221 'finance-rel':220 'four':123 'function':232 'gas':151 'gate':3,20,44 'generat':159 'geocod':156 'howev':169 'indic':81 'infrastructur':154 'insight':133 'json-api' 'key':113 'land':173 'learn':136 'limit':115 'list':69,161 'live':239 'lookup':217 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':135 'made':104 'map':203 'marketplac':42 'max':83 'may':211 'metric':129 'micropay':55 'micropayment API' 'mime':249 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'output':248 'page':174,184 'pay-per-call API' 'payment':102 'per':53,96 'per-request':52 'per-request-micropayment' 'platform':5,22,121 'post':76 'post-method' 'premium':71 'premium API access' 'price':145,168,181 'prompt':191 'protocol':40 'quot':150 'rate':114,148 'readm':183 'record':216 'relat':222 'render':186 'report':130 'repres':212 'request':54,77,97 'requir':118 'respons':245 'schema':228 'scheme':109 'sentiment':137 'settl':56 'share':163 'specif':64,214 'subscript':117 'summar':140 'text':139 'token':149 'trade':215 'trades API' 'type':250 'uncertain':234 'unit':89 'usdc':58,91,98 'usdc-base' 'use':99 'util':13,30,155 'valid':157,242 'varieti':48 'via':105,240 'wallet':190 'web3':144 'without':225 'x402':2,19,39,79,107 'x402 endpoint' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"6ef88b43-93ac-4604-9faf-dae9bb749b1b","listingId":"d94aa4d8-b9f2-43e9-8522-2f311164a504","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/154","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:43.816Z"}],"sources":[{"listingId":"d94aa4d8-b9f2-43e9-8522-2f311164a504","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/154","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:43.816Z","lastSeenAt":"2026-04-26T05:32:45.750Z"}],"details":{"listingId":"d94aa4d8-b9f2-43e9-8522-2f311164a504","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/154 \\\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 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/154"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching trade data or financial records on a per-request payment basis","Integrating pay-per-call API access into agent workflows without managing API keys","Accessing various data, AI, and utility endpoints via x402 micropayments"],"bestFor":["Developers or agents wanting zero-commitment, pay-as-you-go API access","Use cases requiring no authentication overhead beyond on-chain payment","Low-cost per-request data retrieval settled on Base L2"],"notFor":["Users needing detailed API documentation or schema definitions before integration","High-volume use cases where subscription pricing would be more economical","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.07Z"},"updatedAt":"2026-04-26T05:32:45.750Z"}}