{"id":"fc76f467-798e-4608-9cfe-69d7751a2a8a","shortId":"exmjda","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/74` 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 call (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/74` endpoint does not appear in the site's public directory, so its exact functionality is unclear — the generic \"Premium API Access\" description is all that is available.\n\nDocumentation is extremely thin. 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 (402 challenge returned), but what data or service it actually provides behind the paywall is not documented.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-endpoint","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["x402 API","micropayment API","pay-per-request API","Base USDC API","lowpaymentfee","trades API","premium API access"],"warnings":["The specific endpoint /api/v1/trades/74 is not listed in the site's public API directory — its purpose is unknown.","No documentation, OpenAPI spec, or request/response examples are available anywhere on the site.","All documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt with no content.","The endpoint's actual functionality behind the paywall cannot be verified without payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/74","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/74","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 via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and the specific purpose of /api/v1/trades/74 is undocumented. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/trades/74':67,172 '/docs':205 '/pricing':207 '/readme':209 '/request':17,34,167 '0.02':16,33,95,166 '000':87 '0x8335':92 '20':86 '402':244 '6':100 'Base USDC API' 'accept':75 'access':45,73,193 'actual':253 'advertis':122 'ai':10,27,134 'amount':84 'analysi':138 'analyt':128 'api':4,21,41,72,112,192 'appear':176 'avail':199,235 'base':7,24,61,88 'behind':51,255 'broader':120 'call':97 'categori':124 'challeng':80,245 'classif':141 'confirm':242 'connect':215 'content':221 'convers':158 'crawl':238 'data':9,26,127,131,249 'decim':101 'descript':194 'directori':182 'document':200,230,260 'embed':142 'endpoint':14,31,50,65,126,162,173,240 'equal':94 'estim':152 'exact':108,185 'exampl':234 'exchang':147 'export':132 'extrem':202 'feed':146 'financ':11,28,143 'four':123 'function':186 'gas':151 'gate':3,20,44 'generat':159 'generic':190 'geocod':156 'howev':169 'indic':81 'infrastructur':154 'insight':133 'key':113 'learn':136 'limit':115 'list':69,161 'live':243 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':135 'made':104 'marketplac':42 'max':83 'metric':129 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':225 'page':210 'pay-per-request API' 'payment':102 'paywal':257 'per':53,96 'per-request':52 'per-request-micropayment' 'platform':5,22,121 'post':76 'post-endpoint' 'premium':71,191 'premium API access' 'price':145,168 'prompt':217 'protocol':40 'provid':254 'public':181 'quot':150 'rate':114,148 'render':212 'report':130 'request':54,77 'request/response':228 'requir':118 'return':246 'schema':229 'scheme':109 'sentiment':137 'servic':251 'settl':56 'share':163 'site':179 'spec':226 'specif':64,171 'subscript':117 'substant':220 'summar':140 'text':139 'thin':203 'token':149 'trades API' 'unclear':188 'unit':89 'usag':233 'usdc':58,91,98 'usdc-base' 'use':99 'util':13,30,155 'valid':157 'varieti':48 'via':105 'wallet':216 'web3':144 'x402':2,19,39,79,107 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"ed039fa5-c2c9-49fc-ac1a-c977577c3bb1","listingId":"fc76f467-798e-4608-9cfe-69d7751a2a8a","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/74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:07.633Z"}],"sources":[{"listingId":"fc76f467-798e-4608-9cfe-69d7751a2a8a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/74","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:07.633Z","lastSeenAt":"2026-04-26T01:02:58.425Z"}],"details":{"listingId":"fc76f467-798e-4608-9cfe-69d7751a2a8a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/74 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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/74"},{"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 offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade data or executing trade-related queries via a single paid POST request","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Programmatic consumption of premium data without subscription commitments"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents with x402-compatible wallets on Base","Low-volume or sporadic API consumers who prefer micropayments over subscriptions"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.888Z"},"updatedAt":"2026-04-26T01:02:58.425Z"}}