Bucket

Bucket (rebranded to Reflag in 2026, reflag.com) is a TypeScript-first feature management platform built for B2B SaaS teams. It provides feature flags with self-cleaning lifecycle automation, AI/agent integration via a hosted MCP server, strongly typed SDKs for React, React Native, Vue, Next.js, Node.js and the browser, OpenFeature providers, local flag evaluation for zero-latency and downtime protection, feature entitlements, in-app feedback collection, and deep integrations with Linear, Slack, GitHub, Datadog, Vercel and analytics tools. The platform exposes two APIs — a Runtime API for evaluating flags for users and companies at request time, and a Management API for programmatically managing apps, environments, flags and targeting rules from CI/CD. Backed by 500 Global and Creandum.

Bucket publishes 2 API contracts indexed on the APIs.io network, including Apps API, and 1 more. Tagged areas include Company, Feature Flags, Feature Management, Feature Flagging, and Developer Tools.

The Bucket catalog on APIs.io includes 1 Spectral governance ruleset.

Bucket’s developer surface includes documentation, API reference, getting-started guide, engineering blog, changelog, pricing, signup flow, and 28 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

66.4/100 strong ▬ flat Agent 48/100 agent ready Front door AI 2/6 trace Heartbeat 58/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract 2 Agent Skills

Company Feature Flags Feature ManagementFeature FlaggingDeveloper Tools Software-as-a-Service Entitlements Experimentation MCP Agent Ready

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Software Release & Deployment Management

BC-4210

Apps

POST /apps/{appId}/flags GET /apps/{appId}/flags/{flagKey}/targeting/{envId} PATCH /apps/{appId}/envs/{envId}/companies/{companyId}/flags

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 66.4/100 · strong

Contract Quality 10.1 / 19

Developer Ergonomics 10.3 / 15

Access Clarity 14.0 / 15

Operational Transparency 3.6 / 10

Contract Governance 2.9 / 9

Discoverability 5.6 / 8

Regulatory Posture 5.3 / 15

Create-or-Update Ergonomics 2.2 / 10

Agent readiness — 48/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 0 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too

5 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 53.6 — up to +11.6 composite points
Operational Transparency scores 36.8 — up to +8.2 composite points
Contract Governance scores 31.8 — up to +8.2 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/bucket/apis.yml: open an issue on github.com/api-evangelist/bucket to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 4

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Model Context Protocol (MCP)

measured — observed by APIs.io (verified)

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

OpenAPI

measured — observed by APIs.io (published)

APIs 2

Individual APIs this provider publishes, each with its own machine-readable definition.

Reflag Runtime API

JSON-over-HTTP API browsers and backends use at runtime to fetch evaluated and enabled flags, and to send users, companies and feature-usage events. Publishable-key (client) or ...

Bucket Apps API

The Apps API from Bucket — 9 operation(s) for apps.

Open Collections 1

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Reflag Management Apps API

OPEN COLLECTION

Agent Skills 2

Packaged agent skills for driving this provider's APIs from an AI assistant.

Create and configure a feature flag

AGENT SKILL

Target a flag to a company or user

AGENT SKILL

Bucket API pricing

Prices published by Bucket, read 2026-10-28 from reflag.com/pricing.

Plan	Price
Starter	$0/mo Includes: Unlimited seats, 1K MTUs, 3 environments, Toolbar, CLI, MCP, Linear, Slack; 50 /mo feedback; 30 days
Pro	$125/mo Includes: Everything on Starter... 10K MTUs, ∞ environments, User permissions, Bulk management, Company segmen
Enterprise	Custom Includes: Everything on Pro... Custom MTUs, Migration support, SAML

Plan details, limits and sources →

Billed by: subscription · FinOps profile →

Pricing Plans 2

Published pricing tiers and plan structures.

Bucket Plans Pricing

3 plans

PLANS

Bucket Price Estimates

0 plans

PLANS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Bucket

SLA

FinOps 1

Cost, billing, and metering signals for API financial operations.

Bucket Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Bucket API Rules

66 rules · 59 errors 6 warnings 1 info

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Bucket Management Overlay

3 actions · update · bucket-management-openapi-original.json

DERIVED

Security Posture 4

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Bucket Authentication

http · 1 scheme

SECURITY

Bucket Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Bucket Vulnerability Disclosure

Hackerone · contact published

SECURITY

Bucket Trust Center

SOC 2, ISO 27001, GDPR

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Bucket Agentic Access

12 operations · 4 acting

AGENTIC

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

X-MCPServerCandidate

LLMsTxt

WellKnown

AgenticAccess

AgentSkill

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

Conventions

Conformance

Lifecycle

Components

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

SDKs

CLI

Access & Security 6

Authentication, authorization, and security posture

TrustCenter

Security

Compliance

Authentication

DomainSecurity

VulnerabilityDisclosure

VulnerabilityDisclosure

Operate 2

Status, limits, changes, and where to get help

ChangeLog

ChangeLog

StatusPage

StatusPage

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Overlay

Overlay

Source (apis.yml)

aid: bucket
name: Bucket
description: Bucket (rebranded to Reflag in 2026, reflag.com) is a TypeScript-first feature management platform built for
  B2B SaaS teams. It provides feature flags with self-cleaning lifecycle automation, AI/agent integration via a hosted MCP
  server, strongly typed SDKs for React, React Native, Vue, Next.js, Node.js and the browser, OpenFeature providers, local
  flag evaluation for zero-latency and downtime protection, feature entitlements, in-app feedback collection, and deep integrations
  with Linear, Slack, GitHub, Datadog, Vercel and analytics tools. The platform exposes two APIs — a Runtime API for evaluating
  flags for users and companies at request time, and a Management API for programmatically managing apps, environments, flags
  and targeting rules from CI/CD. Backed by 500 Global and Creandum.
url: https://raw.githubusercontent.com/api-evangelist/bucket/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- 500-global
- creandum
x-tier: stub
x-tier-reason: portfolio-lead
x-rebrand: Bucket (bucket.co) rebranded to Reflag (reflag.com) in 2026; likebucket.com no longer resolves.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
image: https://cdn.prod.website-files.com/68a872edf3df6064de547670/68b8414134c540f12c2928bc_reflag-dynamic-favicon.svg
x-docs-platform: gitbook
x-docs-platform-confidence: high
x-docs-platform-checked: 2026-09-21
tags:
- Company
- Feature Flags
- Feature Management
- Feature Flagging
- Developer Tools
- Software-as-a-Service
- Entitlements
- Experimentation
- MCP
- Agent Ready
tags_raw:
- Company
- Feature Flags
- Feature Management
- Feature Flagging
- Developer Tools
- SaaS
- Entitlements
- Experimentation
- MCP
- Agent Ready
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- name: Reflag Runtime API
  description: JSON-over-HTTP API browsers and backends use at runtime to fetch evaluated and enabled flags, and to send users,
    companies and feature-usage events. Publishable-key (client) or secret-key (server) bearer auth; EU point of presence
    at front-eu.reflag.com.
  humanURL: https://docs.reflag.com/api/public-api
  baseURL: https://front.reflag.com
- aid: bucket:bucket-apps-api
  name: Bucket Apps API
  description: The Apps API from Bucket — 9 operation(s) for apps.
  humanURL: https://docs.reflag.com/api/reflag-rest-api
  baseURL: https://app.reflag.com/api
  tags:
  - Application
  tags_raw:
  - Apps
  properties:
  - type: OpenAPI
    url: openapi/bucket-apps-api-openapi.yml
  - type: ErrorCatalog
    url: errors/bucket-error-codes.yml
  - type: DataModel
    url: data-model/bucket-data-model.yml
common:
- type: Plans
  url: plans/bucket-plans-pricing.yml
- type: CapabilityMap
  url: capabilities/bucket-capability-edges.yml
  name: Bucket Business Capability Map
- type: Overlay
  url: overlays/bucket-management-overlay.yaml
- type: TrustCenter
  url: security/bucket-trust-center.yml
- type: Website
  url: https://reflag.com
- type: DeveloperPortal
  url: https://docs.reflag.com
- type: Documentation
  url: https://docs.reflag.com
- type: APIReference
  url: https://docs.reflag.com/api/reflag-rest-api/reflag-api-reference
- type: GettingStarted
  url: https://docs.reflag.com/welcome/readme
- type: Blog
  url: https://reflag.com/blog
- type: ChangeLog
  url: https://reflag.com/changelog
- type: Pricing
  url: https://reflag.com/pricing
- type: SignUp
  url: https://app.reflag.com/signup
- type: Login
  url: https://app.reflag.com/login
- type: TermsOfService
  url: https://reflag.com/legal/terms
- type: PrivacyPolicy
  url: https://reflag.com/legal/privacy-policy
- type: GitHubOrganization
  url: https://github.com/reflagcom
- type: StatusPage
  url: https://status.reflag.com
- type: Security
  url: https://reflag.com/legal/security-policy
- type: Compliance
  url: https://reflag.com/security
- type: Packages
  url: packages/bucket-packages.yml
- type: SDKs
  url: packages/bucket-packages.yml
- type: CLI
  url: cli/bucket-cli.yml
- type: X-MCPServerCandidate
  url: mcp/bucket-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: LLMsTxt
  url: llms/bucket-llms.txt
- type: WellKnown
  url: well-known/bucket-well-known.yml
- type: Authentication
  url: authentication/bucket-authentication.yml
- type: Conventions
  url: conventions/bucket-conventions.yml
- type: Conformance
  url: conformance/bucket-conformance.yml
- type: Lifecycle
  url: lifecycle/bucket-lifecycle.yml
- type: Components
  url: components/bucket-components.yml
- type: DomainSecurity
  url: security/bucket-domain-security.yml
- type: VulnerabilityDisclosure
  url: security/bucket-vulnerability-disclosure.yml
- type: AgenticAccess
  url: agentic-access/bucket-agentic-access.yml
- type: AgentSkill
  url: skills/_index.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

Bucket API — frequently asked questions

Does Bucket have an API?

Yes. APIs.io lists 2 APIs from Bucket, including Reflag Runtime API and Bucket Apps API.

Is there an OpenAPI specification for the Bucket API?

Yes. APIs.io indexes 1 OpenAPI specification for Bucket, each linked for download from this page.

How do I authenticate with the Bucket API?

Bucket documents its authentication (http · 1 scheme). The details are profiled on APIs.io as Bucket Authentication.

How much does the Bucket API cost?

Bucket publishes its prices; its Starter plan is $0/mo as of 2026-10-28. APIs.io lists 3 pricing plans for Bucket, with each plan's price, limits and inclusions under Pricing on this page.

Is the Bucket API ready for AI agents?

Bucket has a Kin Score of 66.4 out of 100 (strong) and an Agent Readiness score of 48.1 (agent-ready), scored by API Evangelist on 2026-11-06.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

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Tools for providers

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find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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Every operation they expose

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