Bridge by Wekoya / Guides / How to stop one user from running up your AI bill

How to stop one user from running up your AI bill

In short: Give every user of your app their own budget and every key its own limit. On Bridge by Wekoya you send the X-Bridge-End-User header with each request, and Bridge meters that user and stops them at their budget with a 402, while everyone else carries on.

Updated 8 November 2026

Three limits, from widest to narrowest

• A naira limit on each API key, checked before every request.
• A budget for each of your users: name the user on each request with X-Bridge-End-User, and Bridge tracks and limits them separately. See your users' budgets.
• Short-lived guest keys for browsers and phones, made by your server, that expire and stop at max_spend. See browser and mobile apps.

Name the user on each request

reply = client.chat.completions.create(
    model="gpt-6-luna",
    messages=[{"role": "user", "content": question}],
    extra_headers={"X-Bridge-End-User": user.id},
)

Create each user first, or turn on auto-create in the console. When a user's budget is spent, their requests get a 402 end_user_budget_exhausted; show them a friendly message instead of an error.

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