Backblaze
Backblaze is a cloud storage and data backup provider offering B2 Cloud Storage - a low-cost, S3-compatible object storage service. Backblaze provides both a native B2 API and an S3-compatible API, enabling developers to build applications that store unlimited data at a fraction of major cloud provider costs. Features include file versioning, lifecycle rules, event notifications, object lock, cross-region replication, and a Cloudflare bandwidth alliance for zero-egress CDN delivery.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles Backblaze the way a machine reads it — 181 machine-readable artifacts across 7 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Backblaze scores 47.0/100 (developing), with a separate agent-readiness read of 32/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-10 · rubric v0.20.0
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How we profile Backblaze
Each block below is one kind of artifact we hold for Backblaze. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 7
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Backblaze S3-Compatible API
The Backblaze S3-Compatible API allows existing applications built for Amazon S3 to work with Backblaze B2 Cloud Storage with minimal code changes. Supports S3 authentication (A...
Backblaze Application Keys API
Create and manage application keys for access control
Backblaze Authorization API
Account authorization and token management
Backblaze Buckets API
Bucket creation, management, and configuration
Backblaze Files API
File upload, download, listing, deletion, and metadata
Backblaze Large Files API
Multi-part upload for large files
Backblaze Notifications API
Bucket event notification configuration
Scroll within the panel for all 7 ·
Postman Collections 1
A runnable collection turns the contract into something a developer can execute in seconds. We profile them because the fastest way to trust an API is to make a real call against it.
Ready-to-run Postman collections for exercising this provider's APIs.
Backblaze B2 Native API
POSTMANOpen Collections 7
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTIONBackblaze B2 Native Application Keys API
OPEN COLLECTIONBackblaze B2 Native Application Keys Authorization API
OPEN COLLECTIONBackblaze B2 Native Application Keys Buckets API
OPEN COLLECTIONBackblaze B2 Native Application Keys Files API
OPEN COLLECTIONBackblaze B2 Native Application Keys Large Files API
OPEN COLLECTIONBackblaze B2 Native Application Keys Notifications API
OPEN COLLECTIONScroll within the panel for all 7 ·
Arazzo Workflows 13
Real integrations are rarely a single call. Arazzo describes the multi-step sequences — auth, then create, then confirm — so both a human and an agent can follow the choreography, not just the endpoints.
Multi-step API workflows described with the Arazzo specification.
Backblaze Authorize and Provision Bucket
Authorize the account, then create a new private bucket using the returned account context.
ARAZZOBackblaze Browse Bucket Files
Authorize, list buckets, list the file names in a bucket, then fetch full info for the first file.
ARAZZOBackblaze Clean Up Unfinished Large Files
Authorize, list unfinished large files in a bucket, then cancel the first stalled upload found.
ARAZZOBackblaze Configure Bucket Event Notifications
Authorize, set a webhook notification rule on a bucket, then read the rules back to confirm.
ARAZZOBackblaze Copy a File Into Another Bucket
Authorize, locate a source file by listing, then server-side copy it into a destination bucket.
ARAZZOBackblaze Create Scoped Application Key
Authorize, create a capability-scoped application key, then confirm it appears in the key list.
ARAZZOBackblaze Large File Multi-Part Upload
Authorize, start a large file, get a part upload URL, then finish the large file from its parts.
ARAZZOBackblaze Provision Bucket and Upload First File
Authorize, create a bucket, get its upload URL, and upload the first file end to end.
ARAZZOBackblaze Purge a File's Versions
Authorize, list a file's versions by prefix, then delete the most recent version found.
ARAZZOBackblaze Rotate Application Key
Authorize, create a replacement application key, then delete the old key it supersedes.
ARAZZOBackblaze Share Private Files
Authorize, mint a prefix-scoped download authorization token, then download a private file by name.
ARAZZOBackblaze Tear Down a Bucket
Authorize, list a bucket's file names, delete the first file version, then delete the empty bucket.
ARAZZOBackblaze Upload a File
Authorize, request a bucket upload URL, then upload a single file to that bucket.
ARAZZOScroll within the panel for all 13 ·
Pricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Backblaze Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Backblaze Finops
FINOPSFeatures 11
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
Notable capabilities this provider offers.
Object Storage
Store and retrieve any amount of data with a simple flat namespace and unique file IDs.
S3-Compatible API
Use existing S3 tools and libraries without modification via the S3-compatible API endpoint.
Large File Multi-Part Upload
Upload files larger than 5GB using the multi-part upload API (b2_start_large_file / b2_upload_part / b2_finish_large_file).
Application Key Management
Create and manage scoped application keys with per-bucket and per-prefix restrictions.
Lifecycle Rules
Automatically delete or hide files after a specified number of days using lifecycle rules.
File Versioning
Keep multiple versions of files; older versions are preserved and accessible by file ID.
Event Notifications
Configure webhook-based event notifications when objects are created, modified, or deleted.
Object Lock
Protect files from deletion or modification for a specified retention period using object lock.
Cross-Region Replication
Replicate buckets to other regions or accounts for disaster recovery and data locality.
Server-Side Encryption
Encrypt data at rest using Backblaze-managed or customer-managed keys.
Cloudflare Bandwidth Alliance
Zero egress fees when serving B2 data through Cloudflare CDN.
Scroll within the panel for all 11 ·
Semantic Vocabularies 1
JSON-LD contexts give the data shared meaning across APIs. We profile them because semantics are what let a machine reconcile 'customer' here with 'customer' somewhere else.
JSON-LD contexts and semantic vocabularies used across these APIs.
Backblaze B2 Context
JSON-LDSpectral Rules 2
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
Backblaze API Rules
SPECTRALBackblaze API Rules
SPECTRALJSON Schema 42
Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.
Standalone JSON Schema definitions for this provider's data models.
AllowedCapabilities
JSON SCHEMAApiInfo
JSON SCHEMAApplicationKey
JSON SCHEMAAuthorizeAccountResponse
JSON SCHEMABucketNotificationRulesResponse
JSON SCHEMABucket
JSON SCHEMACancelLargeFileRequest
JSON SCHEMACancelLargeFileResponse
JSON SCHEMACopyFileRequest
JSON SCHEMACreateBucketRequest
JSON SCHEMACreateKeyRequest
JSON SCHEMADeleteBucketRequest
JSON SCHEMADeleteFileVersionRequest
JSON SCHEMADeleteFileVersionResponse
JSON SCHEMADeleteKeyRequest
JSON SCHEMAFileInfo
JSON SCHEMAFinishLargeFileRequest
JSON SCHEMAGetBucketNotificationRulesRequest
JSON SCHEMAGetDownloadAuthorizationRequest
JSON SCHEMAGetDownloadAuthorizationResponse
JSON SCHEMAGetFileInfoRequest
JSON SCHEMAGetUploadPartUrlRequest
JSON SCHEMAGetUploadPartUrlResponse
JSON SCHEMAGetUploadUrlRequest
JSON SCHEMAGetUploadUrlResponse
JSON SCHEMAHideFileRequest
JSON SCHEMAListBucketsRequest
JSON SCHEMAListBucketsResponse
JSON SCHEMAListFileNamesRequest
JSON SCHEMAListFileNamesResponse
JSON SCHEMAListFileVersionsRequest
JSON SCHEMAListFileVersionsResponse
JSON SCHEMAListKeysRequest
JSON SCHEMAListKeysResponse
JSON SCHEMAListPartsRequest
JSON SCHEMAListPartsResponse
JSON SCHEMAListUnfinishedLargeFilesRequest
JSON SCHEMAListUnfinishedLargeFilesResponse
JSON SCHEMANotificationRule
JSON SCHEMASetBucketNotificationRulesRequest
JSON SCHEMAStartLargeFileRequest
JSON SCHEMAUpdateBucketRequest
JSON SCHEMAScroll within the panel for all 42 ·
JSON Structure 42
JSON Structure captures the data shapes in a form built for tooling — a complement to JSON Schema that keeps the model machine-legible.
JSON Structure definitions describing this provider's data shapes.
B2 Native Api Allowed Capabilities Structure
JSON STRUCTUREB2 Native Api Api Info Structure
JSON STRUCTUREB2 Native Api Application Key Structure
JSON STRUCTUREB2 Native Api Authorize Account Response Structure
JSON STRUCTUREB2 Native Api Bucket Structure
JSON STRUCTUREB2 Native Api Cancel Large File Request Structure
JSON STRUCTUREB2 Native Api Cancel Large File Response Structure
JSON STRUCTUREB2 Native Api Copy File Request Structure
JSON STRUCTUREB2 Native Api Create Bucket Request Structure
JSON STRUCTUREB2 Native Api Create Key Request Structure
JSON STRUCTUREB2 Native Api Delete Bucket Request Structure
JSON STRUCTUREB2 Native Api Delete File Version Request Structure
JSON STRUCTUREB2 Native Api Delete File Version Response Structure
JSON STRUCTUREB2 Native Api Delete Key Request Structure
JSON STRUCTUREB2 Native Api File Info Structure
JSON STRUCTUREB2 Native Api Finish Large File Request Structure
JSON STRUCTUREB2 Native Api Get File Info Request Structure
JSON STRUCTUREB2 Native Api Get Upload Part Url Request Structure
JSON STRUCTUREB2 Native Api Get Upload Part Url Response Structure
JSON STRUCTUREB2 Native Api Get Upload Url Request Structure
JSON STRUCTUREB2 Native Api Get Upload Url Response Structure
JSON STRUCTUREB2 Native Api Hide File Request Structure
JSON STRUCTUREB2 Native Api List Buckets Request Structure
JSON STRUCTUREB2 Native Api List Buckets Response Structure
JSON STRUCTUREB2 Native Api List File Names Request Structure
JSON STRUCTUREB2 Native Api List File Names Response Structure
JSON STRUCTUREB2 Native Api List File Versions Request Structure
JSON STRUCTUREB2 Native Api List File Versions Response Structure
JSON STRUCTUREB2 Native Api List Keys Request Structure
JSON STRUCTUREB2 Native Api List Keys Response Structure
JSON STRUCTUREB2 Native Api List Parts Request Structure
JSON STRUCTUREB2 Native Api List Parts Response Structure
JSON STRUCTUREB2 Native Api Notification Rule Structure
JSON STRUCTUREB2 Native Api Start Large File Request Structure
JSON STRUCTUREB2 Native Api Update Bucket Request Structure
JSON STRUCTUREScroll within the panel for all 42 ·
Examples 42
Real request and response payloads are what turn a spec from abstract into obvious — and they're one of the twelve things an agent needs to call an API correctly on the first try.
Example request and response payloads for these APIs.
B2 Native Api Bucket Example
EXAMPLEScroll within the panel for all 42 ·
Security Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Backblaze Trust Center
SOC 2 Type 2, ISO 27001, HIPAA, GDPR, UK GDPR, CCPA/CPRA, PCI-DSS, GovRAMP, TX-RAMP, HECVAT, TPN (Trusted Partner Network) Blue Shield, VPAT (Section 508), Internet2 Cloud Score...
SECURITYAgentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Use Cases 6
What developers actually build with this provider — captured so the catalogue answers 'what is this for', not just 'what does this expose'.
What developers build with this provider.
Application Data Storage
Store application data, user-uploaded content, and media files in the cloud.
Backup and Disaster Recovery
Use Backblaze B2 as the storage backend for backup tools like Arq, MSP360, and Veeam.
Media Hosting and Delivery
Host images, videos, and other media files and serve them via CDN integration.
Archival Storage
Store infrequently accessed archival data at low cost with lifecycle-based management.
Data Migration
Migrate data from S3 or other cloud storage providers using the S3-compatible API.
CI/CD Artifact Storage
Store build artifacts, logs, and deployment packages in B2 buckets.
Resources
Every other property we hold for Backblaze — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 3
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 4
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 18
Pagination, idempotency, versioning, errors, and events
Scroll within the panel for all 18 ·
Build 10
SDKs, sample code, and the tooling you integrate with
Scroll within the panel for all 10 ·
Access & Security 3
Authentication, authorization, and security posture
Operate 5
Status, limits, changes, and where to get help
Commercial 3
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
Other 1
Properties that don't map to a standard resource type
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This is an independent, third-party profile of Backblaze, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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