{"id":"ea6044d2-aa5b-451f-82bc-de1f3e9f5459","shortId":"FaVbkA","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/charges/396` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (docs, pricing, and API pages all show only a \"Connect wallet\" prompt), so the actual request/response schemas for individual endpoints are unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) are all empty beyond a 'Connect wallet' prompt — no usable API docs exist","No request or response schema is available for this endpoint or any other on the platform","The specific function of /api/v1/charges/396 ('Premium API Access') is unclear — it may be a generic charge endpoint rather than a specific service","No OpenAPI spec, ai-plugin manifest, or agents.txt is provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/396","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/charges/396","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 pricing and payment details. However, documentation is effectively nonexistent — all doc/pricing/API pages render only a wallet-connect prompt. No request or response schemas are available for any endpoint, and the specific purpose of /api/v1/charges/396 ('Premium API Access') is entirely opaque. The platform lists many endpoints but provides no detail on what inputs they accept or what they 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'/request':13,28 '0.02':12,27,63,122,176 '000':111 '0x8335':116 '20':110 '2913':117 '300':135 '402':105 '6':126 'accept':140 'access':101 'account':75 'across':45 'actual':202 'advertis':149 'ai-inference' 'ai/ml':48 'analysi':153 'analyt':47 'api':5,20,37,73,100,191 'application/json':145 'attach':83 'base':8,23,70,112,119 'base network api' 'base-network' 'beyond':181 'broader':147 'call':4,19 'caller':81 'challeng':106 'classif':156 'classification' 'connect':197 'convers':168 'crypto-data' 'data':46,51,170 'data-analytics' 'decim':127 'doc':188 'document':180 'embed':157 'embeddings' 'empti':187 'enabl':36 'endpoint':44,56,93,139,150,207 'equal':121 'essenti':186 'estim':165 'exact':132 'exchang':160 'feed':159 'finance-data' 'finance/web3':50 'gas':164 'generat':171 'geocod':166 'geocoding' 'given':123 'header':87 'howev':179 'http':141 'individu':206 'infer':49 'key':74 'land':183 'limit':78 'list':97 'low payment fee' 'lowpaymentfee.com':31 'micropayment api' 'network':9,24,71 'no-auth api' 'offer':40 'page':184,192 'pay':2,17,59 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':58 'payment':86,129 'per':3,18,60 'platform':6,21,38,148 'point':178 'post':142 'premium':99 'price':158,177,189 'prompt':199 'quot':163 'rate':77,161 'request':61,90,107 'request/response':203 'requir':80 'return':103,144 'schema':204 'scheme':130 'second':136 'sentiment':152 'sentiment-analysis' 'servic':54 'settl':65 'show':194 'simpli':82 'specif':92 'summar':155 'text':154 'text-summarization' 'timeout':137 'token':162 'unit':113 'unknown':209 'usdc':15,30,67,115,124 'usdc api' 'usdc-settlement' 'util':53 'utility-services' 'valid':167 'varieti':42 'via':10,25 'wallet':198 'x402':11,26,35,85 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"19c571e6-36b3-4fa9-8809-584c9e12d13e","listingId":"ea6044d2-aa5b-451f-82bc-de1f3e9f5459","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/charges/396","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:28.402Z"}],"sources":[{"listingId":"ea6044d2-aa5b-451f-82bc-de1f3e9f5459","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/396","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:28.402Z","lastSeenAt":"2026-04-23T06:31:02.709Z"}],"details":{"listingId":"ea6044d2-aa5b-451f-82bc-de1f3e9f5459","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/396 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\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 per request, no API keys, no rate limits, settled 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/charges/396"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes, gas estimates, or exchange rates via micropayment","Geocoding or data validation as a utility service with no subscription commitment","Exporting analytics data or generating insights on a per-request basis"],"bestFor":["AI agents that need stateless, pay-per-call access to diverse utility endpoints","Developers prototyping with low-cost API calls and no signup friction","Web3-native applications already operating on Base network with USDC"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SDKs, or guaranteed SLAs","Applications requiring non-USDC or non-Base-network payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.439Z"},"updatedAt":"2026-04-23T06:31:02.709Z"}}