Metlo

Metlo provides an API security platform that automatically discovers, monitors, and protects APIs in real time. It offers developers and security teams visibility into API traffic, detects anomalies, and enforces policies without requiring code changes. Metlo’s solution integrates with CI/CD pipelines, supports OpenAPI specifications, and provides detailed dashboards and alerts to help organizations secure their API surface. The company focuses on simplifying API security for modern cloud-native environments, enabling rapid detection of threats and compliance with industry standards. Metlo also offers a free tier and enterprise plans, extensive documentation, and SDKs for multiple languages.

Metlo is listed with 1 API on the APIs.io network. Tagged areas include API Security, Cloud-Native, Real-Time Monitoring, OpenAPI, and CI/CD Integration.

Metlo’s developer surface includes CLI, sandbox, authentication, documentation, getting-started guide, signup flow, and 12 more developer resources.

🌐 Visit website📡 Profile data on GitHub
24.6/100 emerging Agent 25/100 agent aware Full breakdown ↓
scored 2026-10-23 · rubric v0.25.0 · Show this score on your site →
1 API
API SecurityCloud-NativeReal-Time MonitoringOpenAPICI/CD Integration

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-10-23 · rubric v0.25.0
Composite quality — 24.6/100 · emerging
Contract Quality 0.0 / 21
Developer Ergonomics 10.9 / 17
Access Clarity 4.0 / 17
Operational Transparency 0.6 / 11
Contract Governance 0.0 / 10
Discoverability 5.3 / 9
Regulatory Posture 2.4 / 15
Agent readiness — 25/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 0 / 6
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 8 / 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
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/.
Show this score on your site. Kin Score badge preview for Metlo It updates itself when the score changes. Paste this where you link to your API docs: 
<a href="https://apis.io/providers/metlo/"><img src="https://apis.io/badge/metlo/card.svg" alt="Metlo on APIs.io — Kin Score by API Evangelist"></a>
Other styles, a README pill and a shields.io endpoint are on the badge page.
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 github.com/api-evangelist/metlo: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

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.

OpenAPI
tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

APIs 1

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

Metlo API

Metlo API provides API security capabilities as documented.

Security Posture 2

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

Metlo Authentication

4 schemes

SECURITY

Metlo Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Resources

Get Started 4

Portal, sign-up, and the first successful call

Sandbox
Sandbox
 DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 SignUp
SignUp

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt
 WellKnown
WellKnown

Build 4

SDKs, sample code, and the tooling you integrate with

CLI
CLI
 SDKs
SDKs
 Packages
Packages
 GitHubOrganization
GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

Authentication
Authentication
 DomainSecurity
DomainSecurity

Commercial 1

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService

Company 1

The organization behind the API

Website
Website

Other 3

Properties that don't map to a standard resource type

AgentCard
AgentCard
 Hosts
Hosts
 Vendors
Vendors

Source (apis.yml)

apis.yml Raw ↑ 
aid: metlo
name: Metlo
description: Metlo provides an API security platform that automatically discovers, monitors, and protects APIs in real time.
  It offers developers and security teams visibility into API traffic, detects anomalies, and enforces policies without requiring
  code changes. Metlo’s solution integrates with CI/CD pipelines, supports OpenAPI specifications, and provides detailed dashboards
  and alerts to help organizations secure their API surface. The company focuses on simplifying API security for modern cloud-native
  environments, enabling rapid detection of threats and compliance with industry standards. Metlo also offers a free tier
  and enterprise plans, extensive documentation, and SDKs for multiple languages.
url: https://raw.githubusercontent.com/api-evangelist/metlo/refs/heads/main/apis.yml
x-type: company
x-source: harvest:g2-catalog
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-21 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-20'
modified: '2026-10-20'
tags:
- API Security
- Cloud-Native
- Real-Time Monitoring
- OpenAPI
- CI/CD Integration
tags_raw:
- API Security
- Cloud Native
- Real-time Monitoring
- OpenAPI
- CI/CD Integration
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: CLI
  url: cli/metlo-cli.yml
- type: Sandbox
  url: sandbox/metlo-sandbox.yml
- type: Authentication
  url: authentication/metlo-authentication.yml
- type: LLMsTxt
  url: llms/metlo-llms.txt
- type: AgentCard
  url: a2a/metlo-a2a.yml
- type: WellKnown
  url: well-known/metlo-well-known.yml
- type: Hosts
  url: hosts/metlo-hosts.yml
- type: Vendors
  url: vendors/metlo-vendors.yml
- type: SDKs
  url: packages/metlo-packages.yml
- type: Packages
  url: packages/metlo-packages.yml
- type: DomainSecurity
  url: security/metlo-domain-security.yml
- type: Website
  url: https://metlo.com/
- type: DeveloperPortal
  url: https://docs.metlo.com/
- type: Documentation
  url: https://docs.metlo.com/
- type: GettingStarted
  url: https://docs.metlo.com/intro/getting-started.md
- type: GitHubOrganization
  url: https://github.com/metlo-labs
- type: SignUp
  url: https://app.metlo.com/signup
- type: TermsOfService
  url: https://www.metlo.com/terms
apis:
- name: Metlo API
  description: Metlo API provides API security capabilities as documented.
  humanURL: https://docs.metlo.com/intro/welcome
  baseURL: https://api.metlo.com
  aid: metlo:metlo-api
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: No OpenAPI, AsyncAPI, GraphQL, or other machine-readable contract was found on the provider's hosts.
  evidence:
  - url: https://api.metlo.com/openapi.json
    status: 0
  checked: '2026-10-20'
x-enrichment:
  date: '2026-10-21'
  status: enriched
  artifacts_added: 20
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

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