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Backblaze B2 bucket and application key

Create a Backblaze B2 account and bucket, then an application key scoped to that bucket; the keyID and applicationKey work with the B2 and S3-compatible APIs.

Researched · not yet run liveLast researched 25 October 2026 · Backblaze · provider site

Researched, not yet run live. Built from the provider’s official pages (linked below). A person hasn’t walked this flow end to end yet, so check each step against the source.
Do this with verapliJSON for agents

Steps

Steps marked “human step” are ones only you can do: verapli never signs in, submits, pays or accepts terms for you.

  1. Create or sign in to a Backblaze account

    The person signs up for B2 Cloud Storage at backblaze.com. verapli never creates the account.

    • Guided by hand
    • Human step: You press submit

    Where: https://www.backblaze.com/sign-up/cloud-storage

  2. Create a bucket

    In the web console under B2 Cloud Storage, create a bucket for the app (private unless files must be public).

    • Guided by hand
    • Human step: You press submit
    • After: Create or sign in to a Backblaze account

  3. Create an application key

    Open Application Keys, click Add a New Application Key, name it, restrict Allow Access to Bucket(s) to the one bucket, choose Read and Write (or narrower), and create it. Do not use the master key in apps. verapli captures the applicationKey, which appears only once, and the keyID.

    • verapli co-pilot
    • Human step: You press submit
    • After: Create a bucket

    verapli captures B2_APPLICATION_KEY here by plain code: encrypted in your browser, never shown to AI.

    Where: https://secure.backblaze.com/app_keys.htm

Terms and gotchas

Plain-English summary, not legal advice. Each card links its source.

Can cost moneyThe rules say

The master application key gives complete access to the account, and generating a new one invalidates the old one; use bucket-scoped keys for apps. [1]

What you end up with

Env varSecretFormatWhat it is
B2_APPLICATION_KEY_IDnot secretkeyID of the application key (also the S3 access key id). Name chosen by verapli.
B2_APPLICATION_KEYsecretapplicationKey, shown once (also the S3 secret key). Name chosen by verapli.

Pricing

  • Free tier: First 10 GB storage always free; egress free up to 3x average monthly storage.
  • Costs: From $6.95 per TB per month; egress beyond allowance $0.01/GB.

Source [2]

For agents

The same entry as JSON: /api/v1/entries/backblaze/b2 · requirements /api/v1/requirements/backblaze/b2 · terms /api/v1/terms/backblaze/b2.

Remote MCP (read-only, no auth)
claude mcp add --transport http verapli https://verapli.com/mcp

> "What do I need for Backblaze B2 bucket and application key, and how long will it take?"
  → tools/call requirements { "provider_id": "backblaze/b2" }

Sources

  1. Create and manage app keys Application Keys page, Add a New Application Key, name, Allow Access to Bucket(s) all or one bucket, Allow List All Bucket Names, Read and Write / Read Only / Write Only, optional file prefix and expiry in seconds; keyID always visible, applicationKey shown once; master key gives full access and is invalidated when regenerated. · accessed 25 October 2026 · official
  2. B2 Cloud Storage pricing First 10 GB storage always free; from $6.95 per TB per month; free egress up to 3x average monthly storage then $0.01/GB; no minimum file size or duration fees. · accessed 25 October 2026 · official

Provider rules change. This page is generated from verapli registry version 2026.1025.316; spotted something out of date? Tell us. Backblaze is not affiliated with verapli.