{"id":"88519345-a1de-4586-a2e3-f0c27be56e05","shortId":"VFDAFK","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transfers/194` is listed as \"Premium API Access\" and its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader 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). However, documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no actual API documentation, request/response schemas, or usage examples. The exact functionality behind the `/api/v1/transfers/194` path is unclear from available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","serverless api","no-auth api"],"warnings":["No API documentation available — all doc pages return only a 'Connect wallet' prompt","The specific functionality of /api/v1/transfers/194 ('Premium API Access') is not described anywhere","No request or response schemas are provided for any endpoint","The breadth of advertised capabilities (AI, finance, analytics, utilities) cannot be verified from available material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/194","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/transfers/194","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 USDC on Base), but there is no API documentation, no request/response schema, no examples, and the specific purpose of the /transfers/194 endpoint is undefined. Documentation pages all returned only 'Connect wallet' with no 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'limit':79 'list':98 'low payment fee' 'lowpaymentfee.com':31 'machin':161 'materi':219 'maxamountrequir':109 'metric':155 'micropayment api' 'network':9,24,72 'no-api-key' 'no-auth api' 'offer':40 'page':187,191 'path':214 'pay':2,17,60 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':59 'payment':87,130 'per':3,18,61 'platform':6,21,38,149 'post':142 'premium':100 'price':171 'prompt':197 'quot':176 'rate':78,174 'report':156 'request':62,91,143 'request/response':203 'requir':81 'return':145,192 'schema':204 'scheme':131 'second':137 'sentiment':163 'sentiment-analysis' 'serverless api' 'servic':55 'settl':66 'simpli':83 'span':46 'specif':93 'summar':166 'text':165 'text-summarization' 'timeout':138 'token':175 'unclear':216 'unit':114 'usag':206 'usdc':15,30,68,116,125 'usdc api' 'usdc-settlement' 'util':54 'utility-services' 'valid':182 'via':10,25 'wallet':196 'web3':170 'x402':11,26,35,86,105 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"5823eab0-26df-45a4-81ad-0f9ca3ab3c81","listingId":"88519345-a1de-4586-a2e3-f0c27be56e05","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/transfers/194","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:47.002Z"}],"sources":[{"listingId":"88519345-a1de-4586-a2e3-f0c27be56e05","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/194","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:47.002Z","lastSeenAt":"2026-04-22T08:31:50.739Z"}],"details":{"listingId":"88519345-a1de-4586-a2e3-f0c27be56e05","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/194 \\\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":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with exact scheme and 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/transfers/194"},{"claim":"Platform advertises categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation, API, pricing, and README pages all returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agent-driven API calls that need frictionless per-request payment without API key management","Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) with crypto micropayments","Fetching financial data like token quotes, gas estimates, and exchange rates on demand","Running utility operations like geocoding, validation, and data conversion without subscriptions"],"bestFor":["AI agents and bots that can settle x402 payments autonomously on Base","Developers who want pay-as-you-go API access without signup or rate limits","Crypto-native applications needing low-cost per-call billing in USDC"],"notFor":["Users who need detailed API documentation and well-defined request/response schemas before integrating","High-volume production workloads where $0.02/request adds up and bulk pricing would be preferred","Teams that require traditional authentication, SLAs, or enterprise support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.098Z"},"updatedAt":"2026-04-22T08:31:50.739Z"}}