{"id":"505b7a32-4d55-4fb7-b734-8c899bc95a34","shortId":"Lyygaq","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/Web3, and infrastructure utilities. 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/v1/invoices/41` is listed as \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call, consistent with the site's uniform $0.02/request pricing. The platform advertises categories including: 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 (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 x402 challenge is live and well-formed, confirming the endpoint accepts POST requests and settles payments to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["llm","data","finance","geo"],"synonyms":["pay-per-call API","x402 API","USDC micropayment API","low fee API","Base network API","crypto-paid API","serverless API marketplace"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema provided for any endpoint","The specific purpose and expected input/output of /api/v1/invoices/41 is undocumented","The broad catalog of advertised endpoints (AI, finance, data, utils) cannot be verified for actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/41","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/invoices/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only a wallet-connect prompt. The purpose of the specific /invoices/41 endpoint is unclear beyond its generic 'Premium API Access' label. Effectively a stub 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'insight':134 'key':81 'learn':137 'limit':84 'list':95 'live':201 'low fee API' 'lowpaymentfee.com':39 'machin':136 'metric':130 'network':74 'offer':10,29 'openapi':185 'page':170 'paid':65 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'payment':214 'per':3,22,67,112 'per-request':66 'per-request-billing' 'platform':6,25,46,124 'post':210 'premium':97 'price':122,146,167 'prompt':177 'protocol':78 'provid':48 'quot':151 'rate':83,149 'readm':169 'render':172 'report':131 'request':68,211 'request/response':188 'requir':88 'schema':186 'sentiment':138 'sentiment-analysis' 'serverless API marketplace' 'settl':213 'site':117 'span':53 'spars':163 'specif':90 'subscript':87 'summar':141 'text':140 'text-summarization' 'token':150 'uniform':119 'unit':107 'usdc':9,28,70,109,219 'usdc-base' 'use':69,218 'util':15,34,61 'utility-apis' 'valid':157 'via':75 'wallet':176 'web3':145 'well':204 'well-form':203 'x402':43,77,198 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"ae379b50-cf88-48f6-a685-d366d1d0ba57","listingId":"505b7a32-4d55-4fb7-b734-8c899bc95a34","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/invoices/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:12.049Z"}],"sources":[{"listingId":"505b7a32-4d55-4fb7-b734-8c899bc95a34","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/41","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:12.049Z","lastSeenAt":"2026-04-23T20:31:57.563Z"}],"details":{"listingId":"505b7a32-4d55-4fb7-b734-8c899bc95a34","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/41 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Uniform pricing of $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/invoices/41"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/invoices/41"},{"claim":"Platform advertises 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 API key management","Fetching real-time finance and crypto market data on a per-request basis","Running geocoding or data validation calls paid directly with USDC on Base","Integrating pay-as-you-go analytics and data export into agent workflows"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost ($0.02) utility and AI endpoints without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume production workloads requiring SLAs, rate-limit guarantees, or support contracts","Developers without USDC on Base or unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.424Z"},"updatedAt":"2026-04-23T20:31:57.563Z"}}