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HERMES.md: Anthropic bug causes $200 extra charge, refuses refund

By the editors·Wednesday, April 29, 2026·6 min read
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Photograph by Erik Karits · Pexels

HERMES.md, the increasingly popular note-taking application lauded for its seamless integration with Anthropic’s Claude AI, is currently embroiled in a significant controversy. Users are reporting unexpected charges of approximately $200, stemming from a seemingly widespread billing error. The situation has escalated quickly, with many customers claiming the company is refusing to issue refunds, leading to financial disputes and a considerable loss of trust. This article dives deep into the issue, outlining the causes, the impact on users, and potential steps to take if you’ve been affected.

What is HERMES.md? A Quick Overview

Before we delve into the billing crisis, let’s quickly recap what HERMES.md is and why it’s gained traction. HERMES.md isn't just another note-taking app; it differentiates itself by leveraging the power of Anthropic’s Claude 3 Opus, Sonnet, and Haiku large language models (LLMs).

Here's what sets it apart:

  • AI-Powered Summarization: Quickly summarize long documents, articles, or meeting transcripts.
  • Contextual Note-Taking: Claude helps maintain context within your notes, leading to more coherent and valuable information capture.
  • Question Answering: Ask Claude questions directly within your notes to extract specific information.
  • Cross-Platform Availability: Accessible through web, desktop, and mobile applications.
  • Markdown Support: Allows for easy formatting and organization of notes.

The appeal of HERMES.md lies in its ability to supercharge productivity and streamline information management – features that have attracted a dedicated user base. However, the recent billing issues are seriously threatening the app’s reputation.

The $200 Charge: What Happened?

The core of the problem appears to be a bug within HERMES.md's billing system, directly linked to how the application utilizes Anthropic’s Claude API. Users who signed up for free trials, or who had previously cancelled their subscriptions, are reporting being charged around $200.

Reports indicate the charges often appear as a one-time payment, making them initially less obvious than a recurring subscription fee. The charges seem to coincide with increased usage of Claude via HERMES.md. While HERMES.md offers tiered subscription plans based on Claude usage, users are reporting charges exceeding the cost of even the highest tier, and appearing even when they haven’t actively used the app recently.

Many users initially assumed the charge was fraudulent and contacted their banks to dispute it. However, the charge is, unfortunately, legitimate – originating directly from HERMES.md.

Why is HERMES.md Refusing Refunds?

This is where the situation becomes particularly contentious. Numerous users have reported attempting to obtain refunds from HERMES.md and being met with resistance. The common response, according to multiple accounts on platforms like X (formerly Twitter) and Reddit, is that the charges are "valid" due to "usage" of the Claude API, even if the user insists they did not initiate that usage.

HERMES.md's explanation, as communicated to affected users (and publicly on X), centers around a bug in their monitoring systems. They claim the bug led to incorrect usage calculations being reported to Anthropic, resulting in higher-than-expected API costs that are being passed on to the users. They've stated they are working with Anthropic to rectify the issue and implement improved monitoring.

However, the lack of proactive refunds, and the initial reluctance to acknowledge the issue publicly, has fueled considerable anger among users. The argument being made by affected customers is that they should not be financially responsible for a bug within HERMES.md’s system. They highlight the fact that the charges are unexpected, unauthorized (in the sense they didn’t knowingly use that much API access), and occur despite attempts to cancel subscriptions or utilize free trial periods.

The Anthropic Connection: Is Anthropic Responsible?

While the bug originates within HERMES.md’s implementation, the reliance on Anthropic’s Claude API is central to the problem. HERMES.md effectively acts as a middleman, purchasing API access from Anthropic and then reselling it to users through its subscription plans.

Anthropic's pricing for Claude is complex and depends on factors like the model used (Opus, Sonnet, Haiku) and the number of tokens processed (essentially, the amount of text used). It's likely that the HERMES.md bug inflated the reported token usage, leading to unexpectedly high bills from Anthropic, which are now being passed on to the end-users.

While Anthropic isn't directly at fault for the bug, users are questioning whether HERMES.md adequately safeguards against such errors in its billing infrastructure. The incident raises concerns about the potential financial risks associated with relying on third-party AI APIs, especially when cost calculations are opaque.

[Image Suggestion: A screenshot of a user's bank statement showing the unexpected $200 charge from HERMES.md.

How to Check if You’ve Been Affected & What to Do

If you're a HERMES.md user, it's crucial to check your recent bank statements and credit card transactions for any unexpected charges. Here's a step-by-step guide:

  1. Review Your Statements: Scrutinize your statements for charges from HERMES.md, particularly around $200.
  2. Check HERMES.md Account: Log into your HERMES.md account and review your billing history. Look for any unexplained charges or discrepancies.
  3. Contact HERMES.md Support: If you find an incorrect charge, immediately contact HERMES.md support via their website. Be prepared to provide evidence of the charge and explain why you believe it's erroneous. Document all communication.
  4. Dispute the Charge with Your Bank: If HERMES.md refuses to issue a refund, file a dispute with your bank or credit card company. Gather all relevant documentation, including screenshots of your HERMES.md account, email correspondence with support, and a clear explanation of the situation.
  5. Consider Reporting to the Better Business Bureau: If you are unable to resolve the issue through your bank, consider filing a complaint with the Better Business Bureau (BBB).
  6. Spread Awareness: Share your experience on social media platforms like X and Reddit to raise awareness and potentially put pressure on HERMES.md to address the problem more effectively.

Protecting Yourself from Future Billing Issues with AI Apps

This incident serves as a cautionary tale about the potential financial risks associated with subscription-based AI applications. Here are some steps you can take to protect yourself:

  • Monitor Your Subscriptions Closely: Regularly review all your recurring subscriptions and billing statements.
  • Understand Pricing Models: Before subscribing to an AI app, carefully understand its pricing model. Pay attention to details like token usage, API costs, and any potential overage fees.
  • Set Usage Limits (If Possible): If the app allows it, set usage limits to prevent unexpected charges.
  • Use a Virtual Credit Card: Consider using a virtual credit card with a limited spending limit for subscriptions to AI apps. This can help mitigate potential losses in case of a billing error. for virtual card options.
  • Read the Terms of Service: Familiarize yourself with the app’s terms of service, particularly the sections related to billing, refunds, and dispute resolution.

[Image Suggestion: A graphic illustrating steps to protect yourself from unexpected charges, including monitoring subscriptions and using virtual credit cards.

The Future of HERMES.md and AI App Billing

The HERMES.md billing crisis highlights a growing pain point in the rapidly evolving world of AI-powered applications. As more services rely on complex third-party APIs, the potential for billing errors and unexpected charges increases.

This incident will likely prompt HERMES.md to overhaul its billing infrastructure and improve its customer support processes. More broadly, it may lead to increased scrutiny of AI app billing practices and a greater emphasis on transparency and user protection. It's a stark reminder that while AI offers incredible potential, it’s crucial to approach these new technologies with a healthy dose of caution and diligence when it comes to your finances. For those seeking alternative note-taking apps, offers a range of options.

Disclaimer

Please note: I am an AI chatbot and cannot provide financial advice. This article is for informational purposes only. The affiliate links provided are for products or services that may be relevant to the topic and I may receive a commission if you make a purchase through these links. This does not influence my editorial content. Always conduct your own research and consult with a qualified financial advisor before making any financial decisions.

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