{"id":"08544456-ee87-40df-afe4-a50dd0dbd3cb","shortId":"4bgCfc","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 platform that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint `/api/v1/trades/17` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost 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, the specific `/api/v1/trades/17` endpoint does not appear in the site's public directory, so its exact functionality is unclear — the description simply says \"Premium API Access\" without further detail.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (returns a valid 402 challenge), but what data or service it actually returns upon payment is not documented.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-endpoint","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["lowpaymentfee","x402 api","micropayment api","pay-per-request api","base network api","usdc api","trades api","premium api access"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","The endpoint /api/v1/trades/17 does not appear in the site's public API directory; its actual functionality is undocumented","No OpenAPI spec, request schema, or response schema available","No example requests or responses to verify what the endpoint returns upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/17","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/17","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The specific endpoint /api/v1/trades/17 is not listed on the site's directory, making its actual functionality unknown. This is effectively a stub 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'/api/v1/trades/17':65,170 '/docs':202 '/pricing':204 '/readme':206 '/request':17,34,165 '0.02':16,33,93,164 '000':85 '0x8335':90 '20':84 '402':244 '6':98 'accept':73 'access':44,71,193 'actual':252 'advertis':120 'ai':10,27,132 'analysi':136 'analyt':126 'api':4,21,40,70,110,192 'appear':174 'avail':232 'base':7,24,60,86 'base network api' 'behind':50 'broader':118 'categori':122 'challeng':78,245 'classif':139 'confirm':239 'connect':212 'content':218 'convers':156 'cost':82 'crawl':235 'data':9,26,125,129,248 'decim':99 'descript':188 'detail':196 'directori':180 'document':197,227,258 'embed':140 'endpoint':14,31,49,64,124,160,171,237 'equal':92 'estim':150 'exact':106,183 'exampl':231 'exchang':145 'export':130 'extrem':199 'feed':144 'financ':11,28,141 'four':121 'function':184 'gas':149 'gate':3,20,43 'generat':157 'geocod':154 'howev':167 'indic':79 'infrastructur':152 'insight':131 'key':111 'learn':134 'limit':113 'list':67,159 'live':240 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':133 'made':102 'maximum':81 'metric':127 'micropay':54 'micropayment api' 'network':61 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':222 'page':207 'pay-per-request api' 'payment':100,255 'per':52,94 'per-request':51 'per-request-micropayment' 'platform':5,22,41,119 'post':74 'post-endpoint' 'premium':69,191 'premium api access' 'price':143,166 'prompt':214 'protocol':39 'public':179 'quot':148 'rate':112,146 'render':209 'report':128 'request':53,75,95 'request/response':225 'requir':116 'return':241,253 'say':190 'schema':226 'scheme':107 'sentiment':135 'servic':250 'settl':55 'share':161 'simpli':189 'site':177 'spars':200 'spec':223 'specif':63,169 'subscript':115 'substant':217 'summar':138 'text':137 'token':147 'trades api' 'unclear':186 'unit':87 'upon':254 'usag':230 'usdc':57,89,96 'usdc api' 'usdc-base' 'use':97 'util':13,30,153 'valid':155,243 'varieti':47 'via':103 'wallet':213 'web3':142 'without':194 'x402':2,19,38,77,105 'x402 api' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"9b792147-ec99-4ade-83b7-2bd8d1e7e2db","listingId":"08544456-ee87-40df-afe4-a50dd0dbd3cb","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/17","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:19.233Z"}],"sources":[{"listingId":"08544456-ee87-40df-afe4-a50dd0dbd3cb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/17","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:19.233Z","lastSeenAt":"2026-04-23T19:01:57.534Z"}],"details":{"listingId":"08544456-ee87-40df-afe4-a50dd0dbd3cb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/17 \\\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/17"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Four categories of endpoints are listed: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing trade data or premium content behind a per-request paywall","Programmatic micropayment-gated API consumption by AI agents","Integrating low-cost pay-as-you-go API calls without subscriptions or API keys"],"bestFor":["Agents or developers wanting zero-commitment, pay-per-call API access","x402-compatible clients on the Base network","Use cases requiring no authentication overhead beyond payment"],"notFor":["Users needing detailed API documentation or response schema guarantees before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.605Z"},"updatedAt":"2026-04-23T19:01:57.534Z"}}