# metlo-labs/metlo

Metlo is an open-source API security platform.

Repository: https://github.com/metlo-labs/metlo
Canonical: https://ross.abutalabs.com/products/metlo
Homepage: https://metlo.com
Language: TypeScript
License: MIT
License Family: permissive
Topics: security, api-gateway, api-security, application-security, cybersecurity, monitoring, vulnerabilities, vulnerability-detection, metlo, infosec, api-pentest, aws, bugbounty, bugbounty-tools, infosectools, pentest
Last push: 2025-07-25T01:06:00+00:00

## Health v2 (maintenance only)
Score: 38/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 33, release rhythm 8, longevity 100
- inputs: {"age_days": 1499, "days_push": 405, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1783, forks 108 (observed 2026-08-28T04:05:35.812189+00:00)

## What it is
Metlo is an open-source API security platform that inventories API endpoints, detects malicious traffic in real time, and can automatically block bad actors. It also supports sensitive data scanning and auto-generated security tests for OWASP Top 10 vulnerabilities with CI/CD integration.

## Use cases
- discover and inventory all API endpoints from network traffic
- detect API attacks and bad actors in real time
- automatically block malicious API requests
- scan APIs for PII and sensitive data exposure
- test APIs for OWASP Top 10 vulnerabilities like BOLA and SQL injection
- integrate API security testing into CI/CD pipelines
- self-host an API security tool on AWS, GCP, Azure, or Docker

## When to choose
- you need visibility into all API endpoints and sensitive data across your services
- you want passive real-time attack detection and blocking for APIs
- you want automated OWASP API Top 10 security testing in development and staging
- you prefer a self-hosted, MIT-licensed API security platform

## When to avoid
- you need a WAF for non-API web traffic rather than API-specific security
- you require a fully managed SaaS with vendor support rather than self-hosting
- your stack has no supported language agent or traffic capture point
- you only need simple rate limiting or authentication rather than attack detection

## Facets
- artifact type: service
- maturity: active
- function: security, monitoring, api-gateway, vulnerability-scanning, testing, ci-cd
- domain: security, apis, backend, web-development
- platform: self-hosted, cloud
- tags: api-security, api-inventory, attack-detection, owasp, pentest, traffic-capture, bola, sensitive-data-scanning, devops, docker, nodejs, web-server

## Member repositories
- metlo-labs/metlo (main) score 38

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:35.812189+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:24:18.940535+00:00, confidence not recorded.
  - readme: https://github.com/metlo-labs/metlo (fetched 2026-08-28T04:05:35.812189+00:00, sha 508c98a00ec4)
  - homepage: https://metlo.com (fetched 2026-08-29T11:03:08.074330+00:00, sha cfb96752b26e)
  - registry_npm: https://registry.npmjs.org/metlo (fetched 2026-08-29T11:03:08.083163+00:00, sha 71710be4fe4e)
- Data as of 2026-08-30T08:39:29.467469+00:00.