{"id":"36674dba-169f-4426-9a38-0c72bb937b2d","shortId":"kTHB5Y","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, 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 via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint `/api/v1/trades/61` is listed as \"Premium API Access\" and was probed live, returning a valid 402 challenge. The challenge specifies payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme to the payTo address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The exact functionality behind `/api/v1/trades/61` (labeled \"Premium API Access\") is unclear; it does not appear in the landing page's listed catalog, so its purpose must be inferred from the path — likely trade-related data. Prospective users should be aware that without documented schemas, integration requires experimentation.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-pricing","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","utility-apis"],"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 for any endpoint","The /api/v1/trades/61 endpoint is not listed in the site's public catalog — its exact functionality is unknown","All documentation pages (/docs, /pricing, /README) render only 'Connect wallet' with no technical content","No example request or response payloads are documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/61","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/61","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 catalog, and the specific /api/v1/trades/61 endpoint is not even listed in the catalog. The docs, pricing, and README pages are all empty beyond a wallet-connect 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'/api/v1/trades/61':118,230 '/docs':194 '/pricing':196 '/readme':198 '/request':17,34 '0.02':16,33,91,153 '000':142 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':171 '0x8335':147 '20':141 '2913':148 '300':174 '402':132 '6':157 'Base network API' 'USDC API' 'accept':179 'access':124,234 'across':50 'addit':209 'address':170 'ai':10,27,60 'ai-inference' 'analysi':64 'analyt':54 'api':4,21,41,106,123,233 'appear':240 'application/json':184 'avail':225 'awar':266 'base':7,24,99,143,150 'behind':229 'beyond':186 'broad':46 'catalog':47,247 'categori':52 'challeng':133,135 'classif':67 'classification' 'commit':114 'connect':204 'content':211 'convers':84 'crypto data API' 'crypto-quotes' 'data':9,26,53,57,261 'data-analytics' 'decim':158 'document':185,220,269 'embed':68 'embeddings' 'enabl':40 'endpoint':14,31,49,87,117,178 'equal':152 'estim':78 'exact':165,227 'exampl':223 'exchang':73 'experiment':273 'export':58 'expos':44 'extrem':191 'feed':72 'financ':11,28,69 'finance-data' 'four':51 'function':228 'gas':77 'gas-estimates' 'generat':85 'geocod':82 'geocoding' 'given':154 'infer':253 'infrastructur':80 'insight':59 'integr':271 'key':107 'label':231 'land':188,243 'learn':62 'like':257 'limit':110 'list':120,246 'live':128 'low payment fee' 'lowpaymentfee.com':35 'machin':61 'made':161 'metric':55 'micropayment API' 'must':251 'network':100 'offer':8,25 'openapi':215 'page':189,199,244 'paid':94 'path':256 'pay-per-call API' 'payabl':3,20 'payload':224 'payment':137,159 'payto':169 'per':92 'per-request-pricing' 'platform':5,22,42 'post':180 'premium':122,232 'price':71,89 'probe':127 'prompt':206 'prospect':262 'protocol':104 'purpos':250 'quot':76 'rate':74,109 'relat':260 'render':201 'report':56 'request':93,181 'request/response':218 'requir':272 'return':129,183 'schema':219,270 'scheme':166 'second':175 'sentiment':63 'sentiment-analysis' 'spars':192 'spec':216 'specif':116 'specifi':136 'summar':66 'technic':210 'text':65 'text-summarization' 'timeout':176 'token':75 'trade':259 'trade-rel':258 'trades API' 'unclear':236 'unit':144 'upfront':113 'usdc':96,146,155 'usdc-base' 'user':263 'util':13,30,81 'utility-apis' 'valid':83,131 'via':101,162 'wallet':205 'web3':70 'without':268 'x402':2,19,39,103,164 'x402 API' 'x402-enabled':38 'x402-payable':1,18 'x402-payment'","prices":[{"id":"840c802a-2ec5-4381-80fe-f32801b71622","listingId":"36674dba-169f-4426-9a38-0c72bb937b2d","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/61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:07.633Z"}],"sources":[{"listingId":"36674dba-169f-4426-9a38-0c72bb937b2d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/61","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:07.633Z","lastSeenAt":"2026-04-23T06:31:33.015Z"}],"details":{"listingId":"36674dba-169f-4426-9a38-0c72bb937b2d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/61 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint returns 402 with maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/61"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching real-time financial or trade data with per-call USDC micropayments","Running AI inference (sentiment, summarization, classification) without API key management","Accessing utility services like geocoding or data conversion on a pay-as-you-go basis","Integrating crypto gas estimates or token quotes into trading bots","Agent-driven workflows that need keyless, on-demand API access"],"bestFor":["Developers wanting zero-commitment, pay-per-request API access","AI agents that can settle x402 payments autonomously on Base","Projects needing lightweight access to multiple API categories without subscription overhead"],"notFor":["Users who need detailed API documentation and request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited subscription plans","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.804Z"},"updatedAt":"2026-04-23T06:31:33.015Z"}}