{"id":"a4f738d8-3cf1-457f-9e45-85073c44d1b5","shortId":"yzL6uH","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general-purpose utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/50` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises additional endpoints including 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, no OpenAPI schema, detailed documentation, or example request/response payloads were found during crawling; the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no further content.","tags":[],"capabilities":["x402-payment","per-call-pricing","usdc-base","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","data-analytics","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","data-export","validation","conversion"],"categories":["llm","data","finance","infrastructure"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto-paid API","machine learning API","analytics API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /api, /pricing, and /README pages returned no useful content (only 'Connect wallet')","The specific purpose of /api/v1/messages/50 is undocumented — 'Premium API Access' is vague","No example responses are available; request format is inferred","No information on uptime, SLAs, or rate limits beyond the claim of 'no rate limits'"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/50","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/messages/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI schema, no documentation beyond a landing page listing, no example request/response payloads, and the /api, /pricing, and /README pages are empty. The purpose of the specific /messages/50 endpoint is unclear beyond the generic 'Premium API Access' 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'/api/v1/messages/50':105 '/pricing':204 '/readme':206 '/request':18,36 '0.02':17,35,69,136,185 '000':125 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':148 '0x8335':130 '20':124 '2913':131 '300':151 '6':140 'Base network API' 'USDC API' 'accept':113 'access':111 'addit':158 'address':147 'advertis':119,157 'ai':11,29 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':55 'analysi':162 'analyt':12,30,54 'analytics API' 'api':5,23,43,82,110 'attach':93 'base':8,26,77,126,133 'broad':48 'broader':155 'call':4,22 'caller':91 'challeng':118 'classif':165 'collect':49 'commit':90 'connect':212 'content':218 'convers':177 'conversion' 'cost':122 'cover':10,28 'crawl':201 'crypto-gas-estimates' 'crypto-paid API' 'data':53,58,179 'data-analytics' 'data-export' 'decim':141 'detail':192 'document':193 'embed':166 'enabl':42 'endpoint':51,65,103,159 'equal':135 'estim':174 'everi':64 'exampl':195 'exchang':169 'exchange-rates' 'feed':168 'financ':13,31 'finance-price-feeds' 'finance/web3':57 'found':199 'gas':173 'general':61 'general-purpos':60 'generat':180 'geocod':175 'geocoding' 'given':137 'header':97 'howev':188 'includ':160 'infer':56 'key':83 'limit':86 'list':107 'low fee API' 'lowpaymentfee.com':37 'machine learning API' 'maximum':121 'micropayment API' 'network':78 'offer':46 'openapi':190 'page':207 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'payload':197 'payment':96,143 'per':3,21,70 'per-call-pricing' 'platform':44,156 'point':187 'post':114 'premium':109 'price':67,167,186 'prompt':214 'purpos':62 'quot':172 'rate':85,170 'request':71,100,115 'request/response':196 'return':209 'schema':191 'second':152 'sent':145 'sentiment':161 'settl':72 'simpli':92 'span':52 'specif':102 'suit':6,24 'summar':164 'text':163 'timeout':153 'token':171 'unit':127 'upfront':89 'usdc':9,27,74,129,138 'usdc-base' 'util':15,33,63 'valid':176 'validation' 'wallet':213 'x402':41,95,117 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"2fffcab5-1ae9-461e-885b-35fc7935c189","listingId":"a4f738d8-3cf1-457f-9e45-85073c44d1b5","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/messages/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.048Z"}],"sources":[{"listingId":"a4f738d8-3cf1-457f-9e45-85073c44d1b5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/50","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.048Z","lastSeenAt":"2026-04-22T02:32:08.107Z"}],"details":{"listingId":"a4f738d8-3cf1-457f-9e45-85073c44d1b5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/50 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{\"message\": \"Hello\"}'","exampleRequest":{"message":"Hello"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/50"},{"claim":"All listed endpoints are priced 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":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/50"}],"useCases":["Agent-driven AI inference (sentiment, summarization, classification) without API key management","On-demand financial data retrieval (token quotes, exchange rates, gas estimates) paid per call","Lightweight data analytics and reporting with no subscription overhead","Geocoding and utility operations for bots or automation pipelines","Embedding generation for RAG or search workflows"],"bestFor":["AI agents that need keyless, pay-as-you-go access to diverse API capabilities","Developers prototyping with multiple API categories without committing to subscriptions","Web3-native applications already holding USDC on Base"],"notFor":["High-volume production workloads where per-call pricing becomes expensive compared to bulk plans","Users who need detailed SLAs, documentation, or guaranteed uptime commitments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.054Z"},"updatedAt":"2026-04-22T02:32:08.107Z"}}