{"id":"c33ba41b-9064-4304-9cb0-5e99f52e3932","shortId":"E7zbNf","kind":"x402","title":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that exposes a broad catalog of endpoints across four categories: Data & Analytics (metrics, reports, 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 via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint `/api/v1/trades/52` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the x402 exact scheme to the specified payTo address. The endpoint accepts HTTP POST and returns application/json.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The actual data returned by `/api/v1/trades/52` is unknown; the name \"trades\" suggests financial or trading data but this is not confirmed by any documentation.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","json-api"],"categories":["data","llm","finance","infrastructure"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","trades API","crypto data API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific purpose and data returned by /api/v1/trades/52 is undocumented; 'Premium API Access' is the only description","Cannot verify what data or functionality any of the listed endpoints actually provide"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/52","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/52","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 with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The actual data returned by /api/v1/trades/52 is completely 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'/api/v1/trades/52':117,218 '/docs':177 '/pricing':178 '/readme':181 '/request':17,34 '0.02':16,33,90,138 '000':133 '20':132 '402':127 '6':143 'Base network API' 'USDC API' 'accept':162 'access':123 'across':50 'actual':214 'addit':192 'address':159 'ai':10,27,59 'ai-inference' 'analysi':63 'analyt':54 'api':4,21,41,105,122 'application/json':167 'avail':208 'base':7,24,98,134,146 'beyond':169 'broad':46 'catalog':47 'categori':52 'challeng':128 'classif':66 'classification' 'commit':113 'confirm':233 'connect':187 'convers':83 'crawl':211 'crypto data API' 'crypto-quotes' 'data':9,26,53,215,228 'data-analytics' 'decim':144 'detail':194 'document':168,203,236 'embed':67 'embeddings' 'enabl':40 'endpoint':14,31,49,86,116,161 'estim':77 'exact':153 'exampl':207 'exchang':72 'export':57 'expos':44 'extrem':174 'feed':71 'financ':11,28,68 'finance-data' 'financi':225 'four':51 'gas':76 'gas-estimates' 'generat':84 'geocod':81 'geocoding' 'http':163 'infrastructur':79 'insight':58 'json-api' 'key':106 'land':171 'learn':61 'limit':109 'list':119 'low payment fee' 'lowpaymentfee.com':35 'machin':60 'made':149 'materi':212 'metric':55 'micropayment API' 'name':222 'network':99 'offer':8,25 'openapi':198 'page':172,182 'paid':93 'pay-per-call API' 'pay-per-request' 'payabl':3,20 'payment':147 'payto':158 'per':91 'platform':5,22,42 'post':164 'premium':121 'price':70,88 'prompt':189 'protocol':103 'quot':75 'rate':73,108 'render':184 'report':56 'request':92,129 'request/response':201 'return':125,166,216 'schema':202 'scheme':154 'sentiment':62 'sentiment-analysis' 'sinc':140 'spars':175 'spec':199 'specif':115 'specifi':157 'suggest':224 'summar':65 'technic':193 'text':64 'text-summarization' 'token':74 'trade':223,227 'trades API' 'unit':135 'unknown':220 'upfront':112 'usag':206 'usd':139 'usdc':95,137,141 'usdc-base' 'use':142 'util':13,30,80 'valid':82 'via':100,150 'wallet':188 'web3':69 'x402':2,19,39,102,152 'x402 API' 'x402-enabled':38 'x402-payable':1,18 'x402-payment'","prices":[{"id":"c0db95e8-5044-4825-b9fe-a2936be605a8","listingId":"c33ba41b-9064-4304-9cb0-5e99f52e3932","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/52","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:00.402Z"}],"sources":[{"listingId":"c33ba41b-9064-4304-9cb0-5e99f52e3932","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/52","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:00.402Z","lastSeenAt":"2026-04-23T06:31:32.693Z"}],"details":{"listingId":"c33ba41b-9064-4304-9cb0-5e99f52e3932","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/52 \\\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":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The /api/v1/trades/52 endpoint returns a 402 challenge requesting 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/52"},{"claim":"Documentation pages /docs, /pricing, /api, /README all show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching trade or financial data on a per-request basis without API key management","Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) with micropayments","Retrieving real-time crypto gas estimates and token quotes","Running geocoding or data validation calls with no subscription commitment"],"bestFor":["Developers who want zero-friction, keyless API access via crypto micropayments","Agents and bots that need programmatic pay-per-call data retrieval on Base","Projects already using USDC on Base that want to avoid traditional API billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Developers without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.232Z"},"updatedAt":"2026-04-23T06:31:32.693Z"}}