{"id":"697e1b57-2644-4833-bfa7-4800f2e8b749","shortId":"5Z6QAm","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/53` 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 are listed at the same $0.02/request price point. However, the specific `/api/v1/trades/53` endpoint does not clearly map to any of these advertised categories, and no documentation or schema details are available for it beyond the generic \"Premium API Access\" label.\n\nDocumentation pages (/docs, /api, /pricing, /README) all returned only a \"Connect wallet\" prompt with no substantive content during the crawl, so the actual request/response schemas, supported parameters, and detailed behavior of this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-endpoint","json-response"],"categories":["api-marketplace","finance"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee","trades endpoint"],"warnings":["No API documentation available — all doc pages (/docs, /api, /pricing, /README) returned only a wallet-connect prompt","The endpoint path /api/v1/trades/53 does not match any of the advertised API categories on the homepage; its actual functionality is unknown","No request body schema or response schema is documented; callers cannot know what to send or expect back","No OpenAPI spec, ai-plugin manifest, or agents.txt discovered"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/53","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/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the endpoint name 'trades/53' is opaque with no explanation of what it returns. All doc pages returned only 'Connect wallet' with no 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'/api/v1/trades/53':67,178 '/docs':209 '/pricing':211 '/readme':212 '/request':17,34,172 '0.02':16,33,95,171 '000':87 '0x8335':92 '20':86 '6':100 'Base network API' 'USDC API' 'accept':75 'access':45,73,205 'actual':229 'advertis':81,127,188 'ai':10,27,139 'analysi':143 'analyt':133 'api':4,21,41,72,103,204 'attach':112 'avail':197 'base':7,24,61,88 'behavior':236 'behind':51 'beyond':200 'broader':125 'caller':110 'categori':129,189 'challeng':80 'classif':146 'clear':182 'connect':217 'content':223 'convers':163 'cost':84 'crawl':226 'data':9,26,132,136 'decim':101 'detail':195,235 'document':192,207 'embed':147 'endpoint':14,31,50,65,131,179,239 'equal':94 'estim':157 'exchang':152 'export':137 'feed':151 'financ':11,28,148 'four':128 'gas':156 'gate':3,20,44 'generat':164 'generic':202 'geocod':161 'header':117 'howev':175 'infrastructur':159 'insight':138 'json-response' 'key':104 'label':206 'learn':141 'limit':107 'list':69,167 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':140 'map':183 'marketplac':42 'maximum':83 'metric':134 'micropay':55 'micropayment API' 'network':62 'offer':8,25 'page':208 'paramet':233 'pay-per-call API' 'payment':116,122 'per':53,96 'per-request':52 'per-request-micropayment' 'platform':5,22,126 'point':174 'post':76 'post-endpoint' 'premium':71,203 'price':150,173 'prompt':219 'proof':123 'protocol':40 'quot':155 'rate':106,153 'remain':240 'report':135 'request':54,77,97 'request/response':230 'requir':109 'return':214 'schema':194,231 'sentiment':142 'settl':56 'simpli':111 'specif':64,177 'substant':222 'summar':145 'support':232 'text':144 'token':154 'trades endpoint' 'unit':89 'unknown':241 'usdc':58,91,98 'usdc-base' 'use':99 'util':13,30,160 'valid':120,162 'varieti':48 'wallet':218 'web3':149 'x':115 'x-payment':114 'x402':2,19,39,79,121 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"059ad5e7-693b-43b9-a16e-8395424d7a62","listingId":"697e1b57-2644-4833-bfa7-4800f2e8b749","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/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:03.415Z"}],"sources":[{"listingId":"697e1b57-2644-4833-bfa7-4800f2e8b749","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/53","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:03.415Z","lastSeenAt":"2026-04-22T17:02:10.220Z"}],"details":{"listingId":"697e1b57-2644-4833-bfa7-4800f2e8b749","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/53 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/53"},{"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 in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium trade data via a single micropayment without API key registration","Agent-driven workflows that need on-demand paid API calls settled on Base","Programmatic access to trade information with no subscription commitment"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional API billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","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":"2026-02-17T23:13:45.075Z"},"updatedAt":"2026-04-22T17:02:10.220Z"}}