INTX FIX API Overview
Financial Information eXchange, or FIX, is a standard protocol which can be used to enter orders, submit cancel requests, and receive fills. FIX API users typically have existing software that runs FIX for order management.
The baseline specification for the INTX FIX API is FIX 5.0.
Supported Endpoints
Production
- Order Entry:
tcp+ssl://fix.international.coinbase.com:6110 - Market Data:
tcp+ssl://fix.international.coinbase.com:6120 - Drop Copy:
tcp+ssl://fix.international.coinbase.com:6130
Sandbox
- Order Entry:
tcp+ssl://n5e2.coinbase.com:6110 - Market Data:
tcp+ssl://n5e2.coinbase.com:6120 - Drop Copy:
tcp+ssl://n5e2.coinbase.com:6130
Resend Requests Resend requests are not supported. Every connection establishes a new session and a new set of session sequence numbers.
FIX Gateway
Before logging onto a FIX session, clients must establish a secure connection to the FIX gateway. See the available endpoints above.
TCP SSL
If your FIX implementation does not support establishing a native TCP SSL connection, you must setup a local proxy such as stunnel to establish a secure connection to the FIX gateway.
AWS IP
If connecting from servers outside of AWS which require firewall rules, use the AWS provided resources to determine how best to allowlist AWS IP ranges.
Ciphers
Coinbase Exchange supports TLSv1.2 with the following server ciphers:
| Recommend | Length | Cipher Suite | Elliptic Curve |
|---|---|---|---|
| Preferred | 128 bits | ECDHE-RSA-AES128-GCM-SHA256 | Curve P-256 DHE 256 |
| Accepted | 128 bits | ECDHE-RSA-AES128-SHA256 | Curve P-256 DHE 256 |
| Accepted | 256 bits | ECDHE-RSA-AES256-GCM-SHA384 | Curve P-256 DHE 256 |
| Accepted | 256 bits | ECDHE-RSA-AES256-SHA384 | Curve P-256 DHE 256 |
Sequence Numbers
The exchange resets the sequences weekly. Reset schedule is configured during initial setup. Resets may also be initiated by a firm sending a Logon message with ResetSeqNumFlag=Y.