Feature

Mutual TLS

Certificate-based client authentication at the transport layer.

5 providers 14 APIs 5 declared variants

The API authenticates clients with X.509 certificates over mTLS, often alongside signed requests. Standard in open banking, FAPI, and other high-assurance environments.

5 API providers on the APIs.io network offer mutual tls. The highest-rated are Trulioo, Temporal, AWS App Mesh, Amazon Private CA, MongoDB.

Providers

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Exemplar 2 Complete, well-documented, and agent-ready

Trulioo Trulioo is a Vancouver-based global identity verification platform that operates GlobalGateway, a single-AP... 7 APIs 79.2 Temporal Temporal is an open-source durable execution platform for building reliable long-running distributed workfl... 2 APIs 70.2

Strong 2 Solid coverage with minor gaps

AWS App Mesh AWS App Mesh is a service mesh based on the Envoy proxy that provides application-level networking to make ... 1 API 65.3 Amazon Private CA AWS Private Certificate Authority (AWS Private CA) is a highly available, fully managed private CA service ... 1 API 63.1

Developing 1 Usable, with meaningful gaps to close

MongoDB MongoDB is a source-available cross-platform document-oriented database program. Classified as a NoSQL data... 3 APIs 46.6

What Providers Actually Declared

This feature is a canonical term. These are the free-text strings providers wrote in their own apis.yml that map onto it.

Authentication via Basic, OAuth2 client-credential, HMAC, and Mutual TLSLDAP, X.509, and AWS IAM authenticationX.509 Certificate IssuancemTLS AuthenticationmTLS Encryption

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