{"id":"c7dc4786-eaa0-4f57-9585-e6ce092b4b50","shortId":"e2t3AA","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 at `/api/v1/trades/39` 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). 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.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific functionality behind `/api/v1/trades/39` is unclear — the endpoint path suggests trade data retrieval but no schema or description beyond the generic \"Premium API Access\" label is provided.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["finance","data"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","trades API","lowpaymentfee"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific functionality of /api/v1/trades/39 is undocumented — 'Premium API Access' is a generic label","No request body schema or response schema is documented anywhere","Cannot verify what data this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/39","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/39","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 zero documentation on request/response schemas, no OpenAPI spec, and no examples. The specific purpose of /api/v1/trades/39 is ambiguous. Docs pages are empty beyond a wallet-connect 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'/api/v1/trades/39':67,215 '/docs':180 '/pricing':182 '/readme':184 '/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':45,73,235 'advertis':81,127 'ai':10,27,139 'amount':84 'analysi':143 'analyt':133 'api':4,21,41,72,103,234 'attach':112 'avail':210 'base':7,24,61,88 'base-network' 'behind':51,214 'beyond':230 'broader':125 'caller':110 'categori':129 'challeng':80 'classif':146 'connect':190 'content':196 'convers':163 'data':9,26,132,136,223 'decim':101 'descript':229 'document':175,205 'embed':147 'endpoint':14,31,50,65,131,219 'equal':94 'estim':157 'exampl':208 'exchang':152 'export':137 'extrem':177 'feed':151 'financ':11,28,148 'four':128 'function':213 'gas':156 'gate':3,20,44 'generat':164 'generic':232 'geocod':161 'header':117 'infrastructur':159 'insight':138 'json-response' 'key':104 'label':236 'learn':141 'limit':107 'list':69,167 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':140 'maximum':83 'metric':134 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'offer':8,25 'openapi':200 'page':185 'path':220 'pay-per-request API' 'payload':209 'payment':116,122 'per':53,96 'per-request':52 'per-request-billing' 'platform':5,22,42,126 'point':174 'post':76 'post-endpoint' 'premium':71,233 'price':150,173 'prompt':192 'proof':123 'protocol':40 'provid':238 'quot':155 'rate':106,153 'render':187 'report':135 'request':54,77,97 'request/response':203 'requir':109 'retriev':224 'schema':204,227 'sentiment':142 'settl':56 'simpli':111 'spars':178 'spec':201 'specif':64,212 'suggest':221 'summar':145 'text':144 'token':154 'trade':222 'trades API' 'unclear':217 'unit':89 'usdc':58,91,98 'usdc-micropayment' 'use':99 'util':13,30,160 'valid':120,162 'varieti':48 'wallet':191 '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":"c546c35e-cd15-406d-8c08-d15195cff556","listingId":"c7dc4786-eaa0-4f57-9585-e6ce092b4b50","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:54.503Z"}],"sources":[{"listingId":"c7dc4786-eaa0-4f57-9585-e6ce092b4b50","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/39","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:54.503Z","lastSeenAt":"2026-04-26T04:03:40.975Z"}],"details":{"listingId":"c7dc4786-eaa0-4f57-9585-e6ce092b4b50","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/39 \\\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 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/39"},{"claim":"All endpoints are listed 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"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching trade data via a single paid API call without needing an API key","Integrating pay-per-use data endpoints into autonomous agent workflows","Accessing financial or trade information with on-chain micropayments"],"bestFor":["Agents or developers who want keyless, pay-per-call API access","x402-compatible wallets and clients on the Base network","Low-volume consumers who prefer per-request pricing over subscriptions"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.524Z"},"updatedAt":"2026-04-26T04:03:40.975Z"}}