{"id":"83659734-8d39-42fe-8633-ad49a37c91d2","shortId":"9RFc3Z","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/20` 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 per call (USDC uses 6 decimals). The broader platform lists additional 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 at the same $0.02 price point.\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 spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body `/api/resource/20` expects or what response payload it returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","low fee API","crypto-paid API","micro-payment endpoint"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","No OpenAPI or JSON schema describing request/response formats for /api/resource/20","The endpoint path '/api/resource/20' is generic; its specific functionality is undocumented","The broader platform lists many endpoints but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/resource/20","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/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and the landing page describes the platform's offerings and pricing. However, documentation is effectively nonexistent — all doc/pricing/readme pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples for this specific endpoint. The endpoint path '/api/resource/20' is generic and its purpose is unclear beyond the label 'Premium API 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'/api/resource/20':96,240 '/docs':187 '/pricing':189 '/readme':191 '/request':19,38 '0.02':18,37,127,179 '000':116 '0x8335':121 '20':115 '2913':122 '402':229 '6':132 'Base network API' 'USDC micropayment API' 'accept':104 'access':102 'across':140 'addit':138 'advertis':110 'ai':12,31,150 'ai-inference' 'ai/ml':56 'analysi':154 'analyt':55,144 'api':5,24,45,83,101 'avail':217 'base':8,27,76,117,124 'bodi':239 'broader':135 'call':4,23,129 'categori':142 'challeng':109,230 'classif':157 'classification' 'collect':50 'confirm':224 'connect':197 'content':203 'convers':173 'cost':113 'crawl':220 'crypto-paid API' 'crypto-quotes' 'data':11,30,54,60,143,147 'data-analytics' 'decim':133 'document':182,212,233 'embed':158 'embeddings' 'enabl':44 'endpoint':16,35,52,66,94,139,222 'equal':126 'estim':168 'exampl':216 'exchang':163 'expect':241 'export':148 'extrem':184 'feed':162 'financ':13,32,159 'finance-data' 'finance/crypto':58 'four':141 'gas':167 'general':62 'generat':174 'geocod':171 'geocoding' 'infer':57 'infrastructure/utilities':170 'insight':149 'key':84 'learn':152 'limit':87 'list':98,137 'live':225 'low fee API' 'lowpaymentfee.com':39 'machin':151 'market':59 'maximum':112 'metric':145 'micro-payment endpoint' 'network':77 'offer':10,29 'openapi':207 'page':192 'paid':68 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payload':245 'per':3,22,70,128 'per-request':69 'platform':6,25,46,136 'point':181 'post':105 'premium':100 'price':161,180 'prompt':199 'proper':228 'protocol':81 'provid':48 'quot':166 'rate':86,164 'render':194 'report':146 'request':71,106,238 'request/response':210 'requir':91 'respons':244 'return':226,247 'schema':211 'sentiment':153 'sentiment-analysis' 'servic':64 'span':53 'spars':185 'spec':208 'specif':93 'subscript':90 'summar':156 'text':155 'text-summarization' 'token':165 'unclear':236 'unit':118 'usag':215 'usdc':9,28,73,120,130 'usdc-base' 'use':72,131 'util':15,34,63 'utility-apis' 'valid':172 'via':78 'wallet':198 'web3':160 'without':232 'x402':43,80,108 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"037220e9-e0b2-4996-bb87-beb5c6e76840","listingId":"83659734-8d39-42fe-8633-ad49a37c91d2","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/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:56.816Z"}],"sources":[{"listingId":"83659734-8d39-42fe-8633-ad49a37c91d2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/20","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:56.816Z","lastSeenAt":"2026-04-23T20:01:28.905Z"}],"details":{"listingId":"83659734-8d39-42fe-8633-ad49a37c91d2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/20 \\\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 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/resource/20"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/resource/20"},{"claim":"All 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":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, 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 prices, gas estimates, or exchange rates with per-call payment","Geocoding or data validation as a utility service paid in USDC on Base","Accessing analytics metrics or data exports without subscription commitments"],"bestFor":["AI agents or bots that need keyless, pay-as-you-go API access","Developers wanting low-friction crypto-settled API calls on Base","Use cases requiring very small per-request costs ($0.02) with no minimums"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where $0.02/request adds up and bulk pricing is preferred","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:30:23.86Z"},"updatedAt":"2026-04-23T20:01:28.905Z"}}