{"id":"1a1d2a66-a3af-42c7-88cc-ef36a661c6d1","shortId":"fLakXp","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a collection of endpoints spanning data analytics, AI/ML inference, finance/crypto market data, and general utility services. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/resource/48` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call on the Base network. The platform advertises a uniform $0.02 per request pricing across all its endpoints. Categories of available APIs include: 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).\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The actual functionality behind `/api/resource/48` is unclear; it may be a generic or demo resource rather than a specific named service. The platform is live and responding with valid x402 challenges.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","micropayment API","pay-per-call API","x402 API","USDC API","Base network API","cheap API access","no-auth API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available for any endpoint","The specific resource /api/resource/48 has no documented purpose — 'Premium API Access' is a generic label","No request or response examples available anywhere in the crawl","Cannot verify what data or functionality any endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/resource/48","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/resource/48","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, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the purpose of /api/resource/48 specifically is undefined beyond the generic label 'Premium API Access'. The platform lists many endpoint categories but provides no detail on any of 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'/request':19,38 '0.02':18,37,117,130 '000':112 '20':111 '402':106 'Base network API' 'USDC API' 'access':102 'across':134 'actual':214 'advertis':127 'ai':12,31,150 'ai-inference' 'ai/ml':56 'analysi':154 'analyt':55,144 'api':5,24,45,83,101,141,182 'avail':140 'base':8,27,76,113,123 'behind':216 'call':4,23,120 'categori':138 'challeng':107,243 'cheap API access' 'classif':157 'classification' 'collect':50 'connect':191 'content':197 'convers':174 'crypto-quotes' 'data':11,30,54,60,143,147 'data-analytics' 'demo':226 'detail':208 'doc':181 'document':176,209 'embed':158 'embeddings' 'enabl':44 'endpoint':16,35,52,66,94,137,212 'estim':168 'exampl':205 'exchang':163 'export':148 'extrem':178 'feed':162 'financ':13,32,159 'finance-data' 'finance/crypto':58 'function':215 'gas':167 'general':62 'generat':175 'generic':224 'geocod':172 'geocoding' 'includ':142 'infer':57 'infrastructur':170 'insight':149 'key':84 'learn':152 'limit':87 'list':98 'live':237 'low payment fee' 'lowpaymentfee.com':39 'machin':151 'market':59 'may':221 'metric':145 'micropayment API' 'name':232 'network':77,124 'no-auth API' 'offer':10,29 'openapi':201 'page':186 'paid':68 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'per':3,22,70,119,131 'per-request':69 'per-request-billing' 'platform':6,25,46,126,235 'premium':100 'price':133,161,183 'prompt':193 'protocol':81 'provid':48 'quot':166 'rate':86,164 'rather':228 'readm':185 'render':188 'report':146 'request':71,108,132 'request/response':204 'requir':91 'resourc':227 'respond':239 'return':104 'schema':202 'sentiment':153 'sentiment-analysis' 'servic':64,233 'span':53 'spars':179 'specif':93,231 'subscript':90 'summar':156 'text':155 'text-summarization' 'token':165 'unclear':219 'uniform':129 'unit':114 'usd':118 'usdc':9,28,73,116 'usdc-base-network' 'use':72 'util':15,34,63,171 'utility-apis' 'valid':173,241 'via':78 'wallet':192 'web3':160 'x402':43,80,242 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"0ec5a711-9a56-416d-b7a4-c6512107f658","listingId":"1a1d2a66-a3af-42c7-88cc-ef36a661c6d1","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/resource/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:52.541Z"}],"sources":[{"listingId":"1a1d2a66-a3af-42c7-88cc-ef36a661c6d1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/48","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:52.541Z","lastSeenAt":"2026-04-22T23:00:56.244Z"}],"details":{"listingId":"1a1d2a66-a3af-42c7-88cc-ef36a661c6d1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/48 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) on Base network","source_url":"https://lowpaymentfee.com/api/resource/48"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/resource/48"},{"claim":"Docs, API, pricing, and README pages all show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto and finance data with per-call USDC micropayments","Running utility operations like geocoding or data validation on a pay-as-you-go basis","Integrating agent-driven workflows that settle payments automatically via x402"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost micropayment-gated endpoints without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may not be cost-effective compared to bulk plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.459Z"},"updatedAt":"2026-04-22T23:00:56.244Z"}}