Stairwell

Stairwell is a private-by-design threat intelligence and detection platform that gives security teams a continuously reanalyzed, isolated store of their own files as an alternative to crowdsourced public services like VirusTotal. Its products span AI triage and static/behavioral malware analysis, malware variant discovery, Run-to-Ground incident scoping, and an encrypted Private Vault with retroactive detection as threat intelligence evolves. Stairwell exposes a REST API at app.stairwell.com/v1 (bearer-token auth) covering assets and forwarders, objects and detonation, sightings and variants, YARA rule management and ad-hoc scanning, threat reports and IOC correlation, network intelligence (hostname/IP/ASN WHOIS, cloud-provider lookups), plus outbound event-notification webhooks and an official hosted MCP server for read-only agent access. Added to the API Evangelist network from Accel's portfolio and enriched from Stairwell's public developer surface.

Stairwell is listed with 1 API on the APIs.io network. Tagged areas include Company, Security, Threat Intelligence, Malware Analysis, and Cybersecurity.

The Stairwell catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Stairwell’s developer surface includes documentation, API reference, getting-started guide, engineering blog, support, authentication, and 17 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

39.8/100 developing ▬ flat Agent 30/100 agent ready Front door AI 4/6 moderate Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 API 1 MCP Servers 3 Agent Skills

Company Security Threat Intelligence Malware Analysis Cybersecurity Threat DetectionYARAIncident Response

Kin Score

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

Composite quality — 39.8/100 · developing

Contract Quality 8.3 / 21

Developer Ergonomics 10.0 / 17

Access Clarity 6.0 / 17

Operational Transparency 0.9 / 11

Contract Governance 0.5 / 10

Discoverability 6.4 / 9

Regulatory Posture 4.4 / 15

Agent readiness — 30/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 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 6 / 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 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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):

Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

7 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 39.0 — up to +15.3 composite points
Access Clarity scores 35.5 — up to +12.9 composite points
Operational Transparency scores 7.9 — up to +12.0 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/stairwell/apis.yml: open an issue on github.com/api-evangelist/stairwell 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
Cisco DevNet Ecosystem (builders on Meraki, Catalyst, ISE, ThousandEyes, Splunk)	builds-on	51.7	-	-

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 1

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)

APIs 1

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

Stairwell API

REST API for the Stairwell threat-intelligence platform: manage assets and forwarders, query object metadata/detonation/sightings/variants, manage and scan YARA rules, upload an...

MCP Servers 1

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

Stairwell MCP Server

Remote MCP server at mcp.api.stairwell.com over HTTP.

MCP SERVER

Agent Skills 3

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

Sweep your environment for newly disclosed IOCs

AGENT SKILL

Triage a suspicious file with Stairwell

AGENT SKILL

Hunt the historical corpus with a YARA rule

AGENT SKILL

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Stairwell Events Webhooks

ASYNCAPI

Security Posture 3

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

Stairwell Authentication

http · 1 scheme

SECURITY

Stairwell Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Stairwell Trust Center

trust center published

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

MCPServer

WellKnown

AgentSkill

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Webhooks

Conventions

Lifecycle

ErrorCatalog

Conformance

DataModel

Access & Security 3

Authentication, authorization, and security posture

TrustCenter

TrustCenter

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

TermsOfService

TermsOfService

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: stairwell
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/stairwell.png
name: Stairwell
description: Stairwell is a private-by-design threat intelligence and detection platform that gives security teams a continuously
  reanalyzed, isolated store of their own files as an alternative to crowdsourced public services like VirusTotal. Its products
  span AI triage and static/behavioral malware analysis, malware variant discovery, Run-to-Ground incident scoping, and an
  encrypted Private Vault with retroactive detection as threat intelligence evolves. Stairwell exposes a REST API at app.stairwell.com/v1
  (bearer-token auth) covering assets and forwarders, objects and detonation, sightings and variants, YARA rule management
  and ad-hoc scanning, threat reports and IOC correlation, network intelligence (hostname/IP/ASN WHOIS, cloud-provider lookups),
  plus outbound event-notification webhooks and an official hosted MCP server for read-only agent access. Added to the API
  Evangelist network from Accel's portfolio and enriched from Stairwell's public developer surface.
url: https://raw.githubusercontent.com/api-evangelist/stairwell/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- accel
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
x-docs-platform: readme
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-17
tags:
- Company
- Security
- Threat Intelligence
- Malware Analysis
- Cybersecurity
- Threat Detection
- YARA
- Incident Response
apis:
- name: Stairwell API
  description: 'REST API for the Stairwell threat-intelligence platform: manage assets and forwarders, query object metadata/detonation/sightings/variants,
    manage and scan YARA rules, upload and correlate threat reports and IOCs, run Run-to-Ground analysis, and perform network
    intelligence lookups. Bearer-token authenticated; gRPC service exposed over HTTP/JSON transcoding.'
  humanURL: https://docs.stairwell.com/reference
  baseURL: https://app.stairwell.com/v1
  properties:
  - type: APIReference
    url: https://docs.stairwell.com/reference
  - type: GettingStarted
    url: https://docs.stairwell.com/docs/api-quickstart
  - type: Authentication
    url: authentication/stairwell-authentication.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://www.stairwell.com/
- type: DeveloperPortal
  url: https://docs.stairwell.com/
- type: Documentation
  url: https://docs.stairwell.com/
- type: APIReference
  url: https://docs.stairwell.com/reference
- type: GettingStarted
  url: https://docs.stairwell.com/docs/api-quickstart
- type: Blog
  url: https://stairwell.com/blog/
- type: Support
  url: https://docs.stairwell.com/docs/who-to-contact
- type: Login
  url: https://app.stairwell.com/login
- type: TrustCenter
  url: https://trust.stairwell.com/
- type: PrivacyPolicy
  url: https://stairwell.com/privacy-policy/
- type: TermsOfService
  url: https://stairwell.com/website-terms-and-conditions/
- type: LLMsTxt
  url: llms/stairwell-llms.txt
- type: MCPServer
  url: mcp/stairwell-mcp.yml
- type: Authentication
  url: authentication/stairwell-authentication.yml
- type: Webhooks
  url: asyncapi/stairwell-events-webhooks.yml
- type: Conventions
  url: conventions/stairwell-conventions.yml
- type: Lifecycle
  url: lifecycle/stairwell-lifecycle.yml
- type: ErrorCatalog
  url: errors/stairwell-problem-types.yml
- type: Conformance
  url: conformance/stairwell-conformance.yml
- type: DataModel
  url: data-model/stairwell-data-model.yml
- type: WellKnown
  url: well-known/stairwell-well-known.yml
- type: DomainSecurity
  url: security/stairwell-domain-security.yml
- type: AgentSkill
  url: skills/_index.yml
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 13
  pass: local-v1

Stairwell API — frequently asked questions

Does Stairwell have an API?

Yes. APIs.io lists 1 API from Stairwell, including Stairwell API.

How do I authenticate with the Stairwell API?

Stairwell uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Stairwell Authentication.

Does Stairwell have an MCP server?

Yes. APIs.io lists 1 MCP server for Stairwell: Remote MCP server at mcp.api.stairwell.com over HTTP.

Is the Stairwell API ready for AI agents?

Stairwell has a Kin Score of 39.8 out of 100 (developing) and an Agent Readiness score of 30.0 (agent-ready), scored by API Evangelist on 2026-11-06.

Work with this as data

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