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1. Setup and Initialization

import time
import base58
import requests
from solders.keypair import Keypair

PRIVATE_KEY = "your_private_key_here"

# Generate keypair from private key
keypair = Keypair.from_bytes(base58.b58decode(PRIVATE_KEY))
public_key = str(keypair.pubkey())

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2. Choose Endpoint and Define Operation Type

For this example, we use the order creation endpoint. Refer to Operation Types for a list of all types and corresponding API endpoints. 
API_URL = "https://api.pacifica.fi/api/v1/orders/create"
operation_type = "create_order"
operation_data = {
    "symbol": "BTC",
    "price": "100000",
    "amount": "0.1",
    "side": "bid",
    "tif": "GTC",
    "reduce_only": False,
    "client_order_id": str(uuid.uuid4()),
}

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3. Create Signature Header

Note that all times specified are denoted in milliseconds.

The "expiry_window" field is optional, and defaults to 30_000 (30 seconds) if not specified in the header. 
# Get current timestamp in milliseconds
timestamp = int(time.time() * 1_000)

signature_header = {
    "timestamp": timestamp,
    "expiry_window": 5_000,  
    "type": "create_order",
}

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4. Combine Header and Payload

data_to_sign = {
    **signature_header,
    "data": operation_data,
}
In the case of our example, this creates: 
 {
     "timestamp": 1748970123456,
     "expiry_window": 5000,
     "type": "create_order",
     "data": {
         "symbol": "BTC",
         "price": "100000",
         "amount": "0.1",
         "side": "bid",
         "tif": "GTC",
         "reduce_only": False,
         "client_order_id": "12345678-1234-1234-1234-123456789abc"
     }
 }
Note that data must be in same level as other headers.

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5. Recursively Sort JSON Keys

def sort_json_keys(value):
    if isinstance(value, dict):
        sorted_dict = {}
        for key in sorted(value.keys()):
            sorted_dict[key] = sort_json_keys(value[key])
        return sorted_dict
    elif isinstance(value, list):
        return [sort_json_keys(item) for item in value]
    else:
        return value

sorted_message = sort_json_keys(data_to_sign)
In the case of our example, this creates: 
{
     "data": {
         "amount": "0.1",
         "client_order_id": "12345678-1234-1234-1234-123456789abc",
         "price": "100000",
         "reduce_only": false,
         "side": "bid",
         "symbol": "BTC",
         "tif": "GTC"
     },
     "expiry_window": 5000,
     "timestamp": 1748970123456,
     "type": "create_order"
 }
Note that the recursive sorting alphabetically sorts *all* levels

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6. Create Compact JSON

Compact JSON string with no whitespace and standardized separators 
import json

compact_json = json.dumps(sorted_message, separators=(",", ":"))
In the case of our example, this creates: 
{"data":{"amount":"0.1","client_order_id":"12345678-1234-1234-1234-123456789abc","price":"100000","reduce_only":false,"side":"bid","symbol":"BTC","tif":"GTC"},"expiry_window":5000,"timestamp":1748970123456,"type":"create_order"}
This ensures that all logically identical messages will always produce *identical* signatures

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7. Convert to Bytes and Generate Signature

Messages are converted to UTF-8 bytes for signing. The signature generated is then converted to Base58 string for transmission. 
# Convert to UTF-8 bytes
message_bytes = compact_json.encode("utf-8")

# Sign message bytes using your private key
signature = keypair.sign_message(message_bytes)

# Convert signature to Base58 string
signature_b58 = base58.b58encode(bytes(signature)).decode("ascii")

# Expect an output similar to:
# "5j1Vy9UqYUF2jKD9r2Lv5AoMWHJuW5a1mqVzEhC9SJL5GqbPkGEQKpW3UZmKXr4UWrHMJ5xHQFMJkZWE8J5VyA"

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8. Build Final Request

Build the header with generated authentication info and combine with operation data (NOT the “data” wrapper!) 
request_header = {
    "account": public_key,
    "agent_wallet": None,
    "signature": signature_b58,
    "timestamp": signature_header["timestamp"],
    "expiry_window": signature_header["expiry_window"],
}

final_request = {
    **request_header,
    **operation_data,  # Use the ORIGINAL create order fields
}
In the case of our example, the final request looks like: 
 {
     "account": "6ETnufiec2CxVWTS4u5Wiq33Zh5Y3Qm6Pkdpi375fuxP",
     "agent_wallet": null,
     "signature": "5j1Vy9UqYUF2jKD9r2Lv5AoMWHJuW5a1mqVzEhC9SJL5GqbPkGEQKpW3UZmKXr4UWrHMJ",
     "timestamp": 1748970123456,
     "expiry_window": 5000,
     "symbol": "BTC",
     "price": "100000",
     "amount": "0.1",
     "side": "bid",
     "tif": "GTC",
     "reduce_only": false,
     "client_order_id": "12345678-1234-1234-1234-123456789abc"
 }