> For the complete documentation index, see [llms.txt](https://faq.finerymarkets.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://faq.finerymarkets.com/api-reference/fix-api.md). # FIX API Finery Markets FIX API is based on the FIX 4.4 specification. ### Connection Endpoints for connection are provided by FineryMarkets during the onboarding process. Access is provided using IP-address whitelist, which is also set during the onboarding process. Only TCP is supported, clients should connect using SSL. You should configure 1 API key per session to guarantee a connection. Resend requests are not supported. Every connection establishes a new session and a new set of session sequence numbers. ### Messages **Tag** - FIX tag of the field **Name** - FIX name of the field **R** - “Y” if the field is required, “N” - otherwise **Example** - Field value example **Description** - Brief field description All messages should include the following header:

Tag	Name	Example	Description
8	BeginString	FIX.4.4	Should be set to “FIX.4.4”
9	BodyLength	128	Length of the message body in bytes
35	MsgType	A	Message Type
49	SenderCompId	fjQxw2IJGOeJ9dg1Raam5iudLQUz9mmew3CSVassPx2	Client API key(for messages sent by the client)
56	TargetCompId	FINERYMARKETS	Should be set to “FINERYMARKETS” (for messages sent by the client
34	MsgSeqNum	1	Message sequence number. Should start at 1 and increment with every message.
52	SendingTime	20230911-09:11:14.085	UTC timestamp

All messages should include the following trailer:

Tag	Name	Example	Description
10	Checksum	ABC	Three bytes, simple checksum. ALWAYS LAST FIELD IN MESSAGE; Always defined as three characters. (Always unencrypted)

Checksum<10> is a standard FIX checksum. Description is available [here](https://www.onixs.biz/fix-dictionary/4.2/app_b.html).