# API Authentication Handshake ⎊ Definition

**Published:** 2026-05-29
**Author:** Greeks.live
**Categories:** Definition

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## API Authentication Handshake

An API authentication handshake is the initial sequence of messages exchanged between a client and an exchange to establish a secure, authorized connection. This process verifies the identity of the client and establishes the parameters for the session.

It often involves cryptographic signatures to ensure that the request is authentic and has not been tampered with. A successful handshake is the gateway to all trading activities.

If it fails, the client cannot access market data or place orders. Understanding the details of this handshake is crucial for developers building trading integrations.

It is the first line of defense against unauthorized access and a key part of the API's security architecture. A well-designed handshake is fast, secure, and resilient to errors.

It sets the foundation for a reliable and secure trading connection.

- [Emergency Shutdowns](https://term.greeks.live/definition/emergency-shutdowns/)

- [Cryptographic Signature Verification](https://term.greeks.live/definition/cryptographic-signature-verification/)

- [Session Resumption Protocol](https://term.greeks.live/definition/session-resumption-protocol/)

- [Derivative Expiration Tax](https://term.greeks.live/definition/derivative-expiration-tax/)

- [API Connectivity Reliability](https://term.greeks.live/definition/api-connectivity-reliability/)

- [Secure Multi Party Computation](https://term.greeks.live/definition/secure-multi-party-computation/)

- [Zero Knowledge Proofs for Orders](https://term.greeks.live/definition/zero-knowledge-proofs-for-orders/)

- [Session Token Management](https://term.greeks.live/definition/session-token-management/)

## Glossary

### [Stateless Authentication Systems](https://term.greeks.live/area/stateless-authentication-systems/)

Architecture ⎊ Stateless authentication systems eliminate the necessity for servers to maintain persistent session data, relying instead on self-contained tokens such as JSON Web Tokens to verify identity.

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**Original URL:** https://term.greeks.live/definition/api-authentication-handshake/