Arcjet

Arcjet is a security-as-code platform for developers, delivering rate limiting, bot detection, email validation, sensitive-information detection, and a Shield WAF as building blocks embedded directly in application code via SDKs. The SDK is the primary interface; it runs a local WebAssembly analysis module and calls Arcjet's Decide service - a Connect/gRPC (protobuf) decision API at decide.arcjet.com - for stateful decisions like rate limiting and advanced bot detection.

Arcjet publishes 3 API contracts indexed on the APIs.io network, including Decide API, Report API, and 1 more. Tagged areas include Security, Rate Limiting, Bot Detection, WAF, and Developer Security.

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

Arcjet’s developer surface includes engineering blog, authentication, documentation, and 11 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

32.3/100 thin ▬ flat Agent 43/100 agent ready Front door AI 6/6 dominant Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessPaid

1 published contract 1 MCP Servers

Security Rate Limiting Bot Detection WAFDeveloper Security

What this lets a business do 1

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

Cybersecurity Management

BC-620

Decide

POST /proto.decide.v1alpha1.DecideService/Decide

Kin Score

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

Composite quality — 32.3/100 · thin

Contract Quality 9.0 / 19

Developer Ergonomics 5.9 / 15

Access Clarity 1.2 / 15

Operational Transparency 2.1 / 10

Contract Governance 1.2 / 9

Discoverability 5.1 / 8

Regulatory Posture 2.6 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 43/100 · 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 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 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 5 / 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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
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):

Access Clarity scores 7.9 — up to +18.4 composite points
Contract Quality scores 47.8 — up to +13.1 composite points
Developer Ergonomics scores 39.3 — up to +12.1 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/arcjet/apis.yml: open an issue on github.com/api-evangelist/arcjet 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Network Edge (CDN, networking, peering, edge compute)	standard	34.5 (thin)	1	1
Agent Skills (SKILL.md packages)	standard	34.5 (thin)	1	1

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

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 3

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

Arcjet SDKs

The primary, supported interface to Arcjet. SDKs ship for Node.js, Next.js, Bun, Deno, SvelteKit, NestJS, Remix, Astro, React Router, Fastify, and Python, each wrapping the Conn...

Arcjet Decide API

The Decide API from Arcjet — 1 operation(s) for decide.

Arcjet Report API

The Report API from Arcjet — 1 operation(s) for report.

Open Collections 3

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

Arcjet Decide API

OPEN COLLECTION

Arcjet Decide Report API

OPEN COLLECTION

Arcjet Decide API

OPEN COLLECTION

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Arcjet MCP Server

Remote MCP server at api.arcjet.com over HTTP.

MCP SERVER

Arcjet API pricing

Not yet checked against Arcjet's own pricing page. Compiled by API Evangelist on 2026-06-20 from arcjet.com/pricing; confirm before you rely on a figure.

Plan	Price
Individual flat	—
Startup flat	—
Growth flat	—
Usage-Based Fees usage	—
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Protected Request Allowance: see provider pricing requests
SDK Request Timeout (Production): 500 milliseconds
SDK Request Timeout (Development): 1000 milliseconds

Compiled by API Evangelist, not yet checked against Arcjet's documentation. All 4 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Arcjet Plans Pricing

5 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Arcjet Rate Limits

4 limits

RATE LIMITS

Service Levels 1

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

Arcjet

SLA

FinOps 1

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

Arcjet Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Arcjet API Rules

49 rules · 47 errors 1 warnings 1 info

SPECTRAL

Security Posture 3

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

Arcjet Authentication

apiKey · 1 scheme

SECURITY

Arcjet Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Arcjet Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access 1

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

Arcjet Agentic Access

2 operations · 2 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 3

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 4

The organization behind the API

Blog

Blog

BlogRSS

BlogRSS

LinkedIn

Website

Website

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: arcjet
url: https://raw.githubusercontent.com/api-evangelist/arcjet/refs/heads/main/apis.yml
name: Arcjet
kind: company
description: Arcjet is a security-as-code platform for developers, delivering rate limiting, bot detection, email validation,
  sensitive-information detection, and a Shield WAF as building blocks embedded directly in application code via SDKs. The
  SDK is the primary interface; it runs a local WebAssembly analysis module and calls Arcjet's Decide service - a Connect/gRPC
  (protobuf) decision API at decide.arcjet.com - for stateful decisions like rate limiting and advanced bot detection.
deliveryModel:
  model: saas
  license_evidence:
    not_product:
    - arcjet/arcjet-js
  open_source: unknown
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: low
  source:
  - openapi
  - pricing
  - repository-not-product
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/arcjet.png
tags:
- Security
- Rate Limiting
- Bot Detection
- WAF
- Developer Security
created: '2026-06-20'
modified: '2026-10-06'
specificationVersion: '0.23'
apis:
- aid: arcjet:arcjet-sdks
  name: Arcjet SDKs
  tags:
  - SDK
  - JavaScript
  - TypeScript
  - Python
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.arcjet.com/get-started
  baseURL: https://decide.arcjet.com
  properties:
  - url: https://docs.arcjet.com/get-started
    type: Documentation
  - url: https://github.com/arcjet/arcjet-js
    type: GitHub
  - url: https://www.npmjs.com/package/arcjet
    type: SDKs
  description: The primary, supported interface to Arcjet. SDKs ship for Node.js, Next.js, Bun, Deno, SvelteKit, NestJS, Remix,
    Astro, React Router, Fastify, and Python, each wrapping the Connect/gRPC Decide protocol and the local WebAssembly analysis
    module.
- aid: arcjet:arcjet-decide-api
  name: Arcjet Decide API
  description: The Decide API from Arcjet — 1 operation(s) for decide.
  humanURL: https://docs.arcjet.com/architecture
  baseURL: https://decide.arcjet.com
  tags:
  - Decide
  properties:
  - type: OpenAPI
    url: openapi/arcjet-decide-api-openapi.yml
  - type: Documentation
    url: https://docs.arcjet.com/architecture
  - type: APIReference
    url: https://docs.arcjet.com/reference/nodejs
  - type: PostmanCollection
    url: collections/arcjet.postman_collection.json
  - type: OpenCollection
    url: collections/arcjet.opencollection.json
  - type: GitHub
    url: https://github.com/arcjet/arcjet-js
  - type: Documentation
    url: https://docs.arcjet.com/rate-limiting/concepts
  - type: APIReference
    url: https://docs.arcjet.com/rate-limiting/reference
  - type: Documentation
    url: https://docs.arcjet.com/bot-protection/concepts
  - type: APIReference
    url: https://docs.arcjet.com/bot-protection/reference
  - type: Documentation
    url: https://docs.arcjet.com/email-validation/concepts
  - type: APIReference
    url: https://docs.arcjet.com/email-validation/reference
  - type: Documentation
    url: https://docs.arcjet.com/sensitive-info/concepts
  - type: APIReference
    url: https://docs.arcjet.com/sensitive-info/reference
  - type: Documentation
    url: https://docs.arcjet.com/shield/concepts
  - type: APIReference
    url: https://docs.arcjet.com/shield/reference
- aid: arcjet:arcjet-report-api
  name: Arcjet Report API
  description: The Report API from Arcjet — 1 operation(s) for report.
  humanURL: https://docs.arcjet.com/architecture
  baseURL: https://decide.arcjet.com
  tags:
  - Report
  properties:
  - type: OpenAPI
    url: openapi/arcjet-report-api-openapi.yml
  - type: Documentation
    url: https://docs.arcjet.com/architecture
  - type: APIReference
    url: https://docs.arcjet.com/reference/nodejs
  - type: PostmanCollection
    url: collections/arcjet.postman_collection.json
  - type: OpenCollection
    url: collections/arcjet.opencollection.json
  - type: GitHub
    url: https://github.com/arcjet/arcjet-js
  - type: Documentation
    url: https://docs.arcjet.com/rate-limiting/concepts
  - type: APIReference
    url: https://docs.arcjet.com/rate-limiting/reference
  - type: Documentation
    url: https://docs.arcjet.com/bot-protection/concepts
  - type: APIReference
    url: https://docs.arcjet.com/bot-protection/reference
  - type: Documentation
    url: https://docs.arcjet.com/email-validation/concepts
  - type: APIReference
    url: https://docs.arcjet.com/email-validation/reference
  - type: Documentation
    url: https://docs.arcjet.com/sensitive-info/concepts
  - type: APIReference
    url: https://docs.arcjet.com/sensitive-info/reference
  - type: Documentation
    url: https://docs.arcjet.com/shield/concepts
  - type: APIReference
    url: https://docs.arcjet.com/shield/reference
common:
- url: https://arcjet.com/blog
  type: Blog
- url: https://arcjet.com/blog/atom
  type: BlogRSS
- type: CapabilityMap
  url: capabilities/arcjet-capability-edges.yml
  name: Arcjet Business Capability Map
- type: AgenticAccess
  url: agentic-access/arcjet-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/arcjet-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/arcjet-domain-security.yml
- type: Authentication
  url: authentication/arcjet-authentication.yml
- type: GitHubOrganization
  url: https://github.com/arcjet
- type: LinkedIn
  url: https://www.linkedin.com/company/arcjet
- type: Website
  url: https://arcjet.com
- type: Documentation
  url: https://docs.arcjet.com
- type: Plans
  url: plans/arcjet-plans-pricing.yml
- type: RateLimits
  url: rate-limits/arcjet-rate-limits.yml
- type: FinOps
  url: finops/arcjet-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Arcjet API — frequently asked questions

Does Arcjet have an API?

Yes. APIs.io lists 3 APIs from Arcjet, including Arcjet SDKs, Arcjet Decide API and Arcjet Report API.

Is there an OpenAPI specification for the Arcjet API?

Yes. APIs.io indexes 2 OpenAPI specifications for Arcjet, each linked for download from this page.

How do I authenticate with the Arcjet API?

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

How much does the Arcjet API cost?

APIs.io lists 5 pricing plans for Arcjet, with each plan's price, limits and inclusions under Pricing on this page.

Does Arcjet have an MCP server?

Yes. APIs.io lists 1 MCP server for Arcjet: Remote MCP server at api.arcjet.com over HTTP.

Is the Arcjet API ready for AI agents?

Arcjet has a Kin Score of 32.3 out of 100 (thin) and an Agent Readiness score of 42.7 (agent-ready), scored by API Evangelist on 2026-11-06.

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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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