{"id":"9c2e6df7-cf96-4dbd-b891-d98d89095ae9","shortId":"9VdqFa","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/44` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…), which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 endpoints are listed at the same $0.02/request price point.\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 description of what the `/api/v1/trades/44` endpoint specifically returns. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what input the POST body expects or what the response payload looks like.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-api","json-response","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["x402 API","micropayment API","pay-per-request API","Base USDC API","trades endpoint","lowpaymentfee"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or schema describing request body or response format for /api/v1/trades/44","The specific function of the 'trades/44' endpoint is unknown — 'Premium API Access' is a generic label","Cannot verify what data or service is actually returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/44","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/44","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 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs showing only 'Connect wallet'. The purpose of /api/v1/trades/44 specifically is 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'/api/v1/trades/44':67,212 '/docs':181 '/pricing':183 '/readme':185 '/request':17,34,173 '0.02':16,33,95,172 '000':87 '0x8335':92 '20':86 '402':224 '6':100 'Base USDC API' 'accept':75 'access':45,73 'advertis':81,127 'ai':10,27,139 'analysi':143 'analyt':133 'api':4,21,41,72,103 'attach':112 'base':7,24,61,88 'behind':51 'bodi':236 'broader':125 'caller':110 'categori':129 'challeng':80,225 'classif':146 'confirm':219 'connect':191 'content':197 'convers':163 'cost':84 'data':9,26,132,136 'decim':101 'descript':208 'document':176,228 'embed':147 'endpoint':14,31,50,65,131,166,213,217 'equal':94 'estim':157 'exampl':205 'exchang':152 'expect':237 'export':137 'extrem':178 'feed':151 'financ':11,28,148 'four':128 'gas':156 'gate':3,20,44 'generat':164 'geocod':161 'header':117 'infrastructur':159 'input':233 'insight':138 'json-response' 'key':104 'learn':141 'like':244 'limit':107 'list':69,168 'live':220 'look':243 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':140 'marketplac':42 'maximum':83 'metric':134 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':201 'page':186 'pay-per-request API' 'payload':242 'payment':116,122 'per':53,96 'per-request':52 'per-request-micropayment' 'platform':5,22,126 'point':175 'post':76,235 'post-api' 'premium':71 'price':150,174 'prompt':193 'proof':123 'proper':223 'protocol':40 'quot':155 'rate':106,153 'render':188 'report':135 'request':54,77,97 'request/response':204 'requir':109 'respons':241 'return':215,221 'schema':202 'sentiment':142 'settl':56 'simpli':111 'spars':179 'specif':64,214 'substant':196 'summar':145 'text':144 'token':154 'trades endpoint' 'unclear':231 'unit':89 'usdc':58,91,98 'usdc-base' 'use':99 'util':13,30,160 'valid':120,162 'varieti':48 'wallet':192 'web3':149 'without':227 'x':115 'x-payment':114 'x402':2,19,39,79,121 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"7b56627d-59c6-414a-9435-748056074a62","listingId":"9c2e6df7-cf96-4dbd-b891-d98d89095ae9","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/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:59.233Z"}],"sources":[{"listingId":"9c2e6df7-cf96-4dbd-b891-d98d89095ae9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:59.233Z","lastSeenAt":"2026-04-26T03:03:00.179Z"}],"details":{"listingId":"9c2e6df7-cf96-4dbd-b891-d98d89095ae9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/44 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/44"},{"claim":"All 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 & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/44"}],"useCases":["Accessing trade data via a single micropayment without needing an API key","Programmatic agents purchasing API responses on-the-fly using x402 protocol","Integrating low-cost per-call data endpoints into automated workflows"],"bestFor":["Agents or bots that need keyless, pay-per-call API access","Developers experimenting with x402 micropayment protocols on Base","Low-volume consumers who want no subscription commitments"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.272Z"},"updatedAt":"2026-04-26T03:03:00.179Z"}}