{"id":"95d8112c-27a6-407d-80d7-fe677733f7b4","shortId":"3pj4Ns","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, with no API keys, rate limits, or subscriptions required.\n\nThe specific endpoint at `/api/v1/item/44` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises a uniform $0.02 price across all its endpoints.\n\nThe broader platform offers endpoints in 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). Documentation pages exist at /docs, /pricing, and /README but all returned only a \"Connect wallet\" prompt with no substantive content during crawl. The exact input/output schemas for `/api/v1/item/44` and other endpoints are not documented in the crawled material, making it unclear what data this specific endpoint returns or what request body it expects.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["data","llm","finance","utility"],"synonyms":["pay-per-call API","x402 API","USDC API","micropayment API","low fee API","Base network API","crypto payment API","on-demand API"],"warnings":["The exact purpose and schema of /api/v1/item/44 are undocumented — 'Premium API Access' is a generic label with no specifics.","All documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no substantive content.","No OpenAPI spec, no request/response examples, and no detailed endpoint descriptions are available.","The platform lists many endpoints but it is unclear whether they all function or are placeholders."],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/44","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/item/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base per request). However, the specific endpoint /api/v1/item/44 has no documented input/output schema, no examples, and all documentation pages returned only 'Connect wallet' with no content. The purpose of 'item/44' specifically is unknown. This is effectively a stub 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'/docs':187 '/pricing':188 '/readme':190 '/request':19,38 '0.02':18,37,125,137 '000':115 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':120 '20':114 '6':130 'Base network API' 'USDC API' 'accept':103 'access':101 'across':139 'advertis':134 'ai':12,31,158 'ai-inference' 'ai/ml':56 'analysi':162 'analyt':55,152 'api':5,24,45,84,100 'base':8,27,76,116,122 'bodi':233 'broader':144 'call':4,23 'categori':150 'challeng':108 'classif':165 'classification' 'collect':50 'connect':196 'content':202 'convers':181 'cost':112 'crawl':204,219 'crypto payment API' 'crypto-quotes' 'data':11,30,54,60,151,155,225 'data-analytics' 'decim':131 'document':183,216 'embed':166 'embeddings' 'enabl':44 'endpoint':16,35,52,66,93,142,147,213,228 'equal':124 'estim':176 'exact':206 'exchang':171 'exist':185 'expect':235 'export':156 'feed':170 'financ':13,32,167 'finance-data' 'finance/crypto':58 'four':149 'gas':175 'general':62 'generat':182 'geocod':179 'geocoding' 'indic':109 'infer':57 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'x402-enabled':42 'x402-payment'","prices":[{"id":"08dcc4e4-d968-4f58-ada9-bc6bc08031d3","listingId":"95d8112c-27a6-407d-80d7-fe677733f7b4","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/item/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:50.798Z"}],"sources":[{"listingId":"95d8112c-27a6-407d-80d7-fe677733f7b4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:50.798Z","lastSeenAt":"2026-04-23T20:32:09.316Z"}],"details":{"listingId":"95d8112c-27a6-407d-80d7-fe677733f7b4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/44 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/item/44"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/item/44"},{"claim":"Platform advertises $0.02/request uniform pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without subscriptions or API keys","Fetching real-time financial data and crypto market quotes on a per-request basis","Running data analytics and generating reports with pay-as-you-go pricing","Using utility services like geocoding, validation, and conversion without rate limits"],"bestFor":["Agents and developers who want instant, keyless API access paid in USDC","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions","Web3-native applications that can settle payments on Base"],"notFor":["High-volume production workloads where bulk/subscription pricing would be cheaper","Users without USDC on Base or unfamiliar with crypto payment flows","Applications requiring detailed SLAs, guaranteed uptime, or enterprise support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:40.553Z"},"updatedAt":"2026-04-23T20:32:09.316Z"}}