{"id":"c425cd4f-c442-4bd4-a829-69d2b26180cf","shortId":"47BFWF","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/141` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum 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, the specific `/api/v1/trades/141` endpoint does not appear in the site's public catalog, 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 schema, no request/response examples, and no detailed documentation for any endpoint. The endpoint is confirmed live (402 challenge returned), but what data or service it actually provides behind the paywall is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-endpoint","no-api-key","no-rate-limit"],"categories":["api-marketplace","finance"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","pay-per-request API","USDC API access","Base network API","trades API"],"warnings":["The endpoint /api/v1/trades/141 does not appear in the site's public API catalog — its actual functionality is unknown.","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content.","No OpenAPI schema, request format, or response examples are available.","The purpose and output of this specific endpoint cannot be verified without paying."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/141","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/141","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 x402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific functionality of /api/v1/trades/141 is completely undocumented. The docs pages are empty. This is effectively a stub 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'/api/v1/trades/141':67,172 '/docs':204 '/pricing':206 '/readme':208 '/request':17,34,167 '0.02':16,33,95,166 '000':87 '0x8335':92 '20':86 '402':241 '6':100 'Base network API' 'USDC API access' 'accept':75 'access':45,73,195 'actual':250 'advertis':81,122 'ai':10,27,134 'amount':84 'analysi':138 'analyt':128 'api':4,21,41,72,112,194 'appear':176 'base':7,24,61,88 'behind':51,252 'broader':120 'catalog':182 'categori':124 'challeng':80,242 'classif':141 'confirm':239 'connect':214 'content':220 'convers':158 'data':9,26,127,131,246 'decim':101 'descript':190 'detail':198,231 'document':199,232 'embed':142 'endpoint':14,31,50,65,126,162,173,235,237 'equal':94 'estim':152 'exact':108,185 'exampl':228 'exchang':147 'export':132 'extrem':201 'feed':146 'financ':11,28,143 'four':123 'function':186 'gas':151 'gate':3,20,44 'generat':159 'geocod':156 'howev':169 'infrastructur':154 'insight':133 'key':113 'learn':136 'limit':115 'list':69,161 'live':240 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':135 'made':104 'marketplac':42 'maximum':83 'metric':129 'micropay':55 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':224 'page':209 'pay-per-request API' 'payment':102 'paywal':254 'per':53,96 'per-request':52 'per-request-micropayment' 'platform':5,22,121 'post':76 'post-endpoint' 'premium':71,193 'price':145,168 'prompt':216 'protocol':40 'provid':251 'public':181 'quot':150 'rate':114,148 'render':211 'report':130 'request':54,77,97 'request/response':227 'requir':118 'return':243 'say':192 'schema':225 'scheme':109 'sentiment':137 'servic':248 'settl':56 'share':163 'simpli':191 'site':179 'spars':202 'specif':64,171 'subscript':117 'substant':219 'summar':140 'text':139 'token':149 'trades API' 'unclear':188 'unit':89 'unknown':256 'usdc':58,91,98 'usdc-base' 'use':99 'util':13,30,155 'valid':157 'varieti':48 'via':105 'wallet':215 'web3':144 'without':196 'x402':2,19,39,79,107 'x402 micropayment API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"203d89e5-007c-427a-8142-ebc1a4a5e2ef","listingId":"c425cd4f-c442-4bd4-a829-69d2b26180cf","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/141","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:37.089Z"}],"sources":[{"listingId":"c425cd4f-c442-4bd4-a829-69d2b26180cf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/141","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:37.089Z","lastSeenAt":"2026-04-22T17:02:08.637Z"}],"details":{"listingId":"c425cd4f-c442-4bd4-a829-69d2b26180cf","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# Use an x402-compatible client to pay and access:\ncurl -X POST https://lowpaymentfee.com/api/v1/trades/141 \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","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 (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/141"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","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 functionality via a single micropayment","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-per-call access to various data and utility services"],"bestFor":["Developers or agents wanting zero-signup, pay-per-use API access","x402-compatible agents that can settle USDC on Base","Low-volume or exploratory API usage where subscriptions are overkill"],"notFor":["Users who need detailed documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.298Z"},"updatedAt":"2026-04-22T17:02:08.637Z"}}