{"id":"24ca9166-5854-40c4-a4d5-dae3c883b0b5","shortId":"P9uQ3L","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 provides a broad catalog of pay-per-call endpoints across four categories: 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 priced at $0.02 per request, paid in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/trades/150` is listed as \"Premium API Access\" and returns a live 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is via the x402 exact scheme with a 300-second timeout. The platform advertises no API keys, no rate limits, and instant access — authentication and billing are handled entirely through the x402 payment header.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the `/api/v1/trades/150` endpoint actually returns. The endpoint name suggests trade-related financial data (possibly a specific trade record by ID), but this is speculative based solely on the URL path.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","trades-data","data-analytics","ai-inference","finance-data","geocoding","text-summarization","sentiment-analysis","embeddings"],"categories":["finance","data","llm"],"synonyms":["low payment fee API","x402 trades API","pay-per-call API","USDC micropayment API","Base network API","crypto trade data","402 payment protocol"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The purpose and response format of /api/v1/trades/150 is unknown — 'Premium API Access' is generic","The endpoint path suggests trade data by ID but this is unconfirmed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/150","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/150","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, there is no OpenAPI spec, no documentation beyond a landing page listing, no request/response schema, and no examples. The specific purpose of /api/v1/trades/150 is unclear. This is effectively a stub 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'/request':17,34 '0.02':16,33,94,136 '000':125 '0x8335':130 '20':124 '2913':131 '300':151 '402':119 '402 payment protocol' '6':140 'Base network API' 'USDC micropayment API' 'access':114,165 'across':53 'actual':216 'addit':197 'advertis':156 'ai':10,27,63 'ai-inference' 'analysi':67 'analyt':57 'api':4,21,40,113,158,183 'authent':166 'base':7,24,102,126,133,238 'bill':168 'broad':45 'call':51 'catalog':46 'categori':55 'challeng':120 'classif':70 'connect':192 'content':198 'convers':87 'crypto trade data' 'data':9,26,56,60,226 'data-analytics' 'decim':141 'doc':182 'document':177,207 'embed':71 'embeddings' 'endpoint':14,31,52,90,106,215,219 'entir':171 'equal':135 'estim':81 'exact':147 'exampl':210 'exchang':76 'export':61 'extrem':179 'feed':75 'financ':11,28,72 'finance-data' 'financi':225 'four':54 'gas':80 'gate':3,20 'generat':88 'geocod':85 'geocoding' 'given':137 'handl':170 'header':176 'id':233 'infrastructur':83 'insight':62 'instant':164 'key':159 'learn':65 'limit':162 'list':110 'live':118 'low payment fee API' 'lowpaymentfee.com':35 'machin':64 'metric':58 'name':220 'network':103 'offer':8,25 'openapi':202 'page':187 'paid':97 'path':243 'pay':49 'pay-per-cal':48 'pay-per-call API' 'pay-per-request' 'payment':142,175 'per':50,95 'platform':5,22,41,155 'possibl':227 'premium':112 'price':74,92,184 'prompt':194 'protocol':39 'provid':43 'quot':79 'rate':77,161 'readm':186 'record':231 'relat':224 'render':189 'report':59 'request':96,121 'request/response':205 'return':116,217 'schema':206 'scheme':148 'second':152 'sentiment':66 'sentiment-analysis' 'sole':239 'spars':180 'spec':203 'specif':105,229 'specul':237 'suggest':221 'summar':69 'text':68 'text-summarization' 'timeout':153 'token':78 'trade':223,230 'trade-rel':222 'trades-data' 'unit':127 'url':242 'usdc':99,129,138 'usdc-base' 'util':13,30,84 'valid':86 'via':144 'wallet':193 'web3':73 'x402':2,19,38,146,174 'x402 trades API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"11733b58-8ae4-467d-86e7-74f075957c97","listingId":"24ca9166-5854-40c4-a4d5-dae3c883b0b5","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/150","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:42.619Z"}],"sources":[{"listingId":"24ca9166-5854-40c4-a4d5-dae3c883b0b5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/150","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:42.619Z","lastSeenAt":"2026-04-23T06:31:31.945Z"}],"details":{"listingId":"24ca9166-5854-40c4-a4d5-dae3c883b0b5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/150 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/trades/150"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching trade data or financial records without API key registration","Agents autonomously purchasing API access via x402 micropayments on Base","Accessing AI inference endpoints (sentiment, summarization, classification) on a per-call basis","Retrieving real-time price feeds and exchange rates with crypto-native billing"],"bestFor":["AI agents that need keyless, pay-per-call API access","Developers wanting to avoid subscription commitments for occasional API calls","Crypto-native applications already operating on the Base network"],"notFor":["High-volume use cases where $0.02/request adds up significantly compared to subscription APIs","Users who need detailed API documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.027Z"},"updatedAt":"2026-04-23T06:31:31.945Z"}}