Read balances and history

Before you start#

A key with account:read for balances and limits, and transactions:read for history. Both are on by default when you create a key, and neither can move money.

Balances#

GET/v1/balances lists each asset with a non-zero total, and USDC always:

• available can be traded or given as a gift card now;
• held is reserved: open orders, a pending trade, loan collateral;
• total is available plus held;
• value_usdc and value_isk are indicative values at current prices.

# Signed by sign-headers.sh: see Authentication
curl https://public-api.myntkaup.is/v1/balances \
  $(./sign-headers.sh GET /v1/balances | sed 's/^/-H /')

import { Myntkaup } from "@myntkaup/api";

const client = new Myntkaup(); // reads the key from the environment
const balances = await client.balances.list();
for (const balance of balances.data) {
  console.log(balance.asset, balance.available, balance.held);
}

from myntkaup import Myntkaup

client = Myntkaup()  # reads the key from the environment
balances = client.balances.list()
for balance in balances["data"]:
    print(balance["asset"], balance["available"], balance["held"])

{
  "as_of": "2026-11-03T10:15:10Z",
  "total_value_usdc": "1180.31",
  "total_value_isk": "164210",
  "data": [
    {
      "asset": "BTC",
      "available": "0.0123",
      "held": "0",
      "total": "0.0123",
      "value_usdc": "1180.31",
      "value_isk": "164210"
    }
  ]
}

Amounts are decimal strings. Add them up with a decimal type, never as floats.

Limits#

GET/v1/limits shows your trade and gift card limits, how much of today's (UTC) and the last 30 days' allowance you've used, and the key's rate limits. Check it before a large trade.

Trades or transactions?#

There are two histories, for different questions:

Trades made before quotes existed, or in the app or webapp, have quote_id: null.

Ledger entries#

A ledger entry records one event and how it changed each balance:

{
  "id": "tx_01JB8X2Q4M7Z3V9K5T1N6R0P2W",
  "type": "trade",
  "action": "buy-btc-usdc",
  "label": "Buy BTC",
  "changes": [
    {
      "asset": "USDC",
      "amount": "-100.00",
      "balance_after": "900.00"
    },
    {
      "asset": "BTC",
      "amount": "0.00104210",
      "balance_after": "0.00104210"
    }
  ],
  "created_at": "2026-11-03T10:15:10Z"
}

• type is one of trade, deposit, withdrawal, fee, gift, giftcode, referral_bonus, loan, hold and other.
• label is a readable description, in English by default or Icelandic with lang=is.
• changes has one entry per asset: the signed amount and the balance_after.

Reading everything#

listAll (list_all in Python) follows the cursor for you. See Pagination for the details.

import { Myntkaup } from "@myntkaup/api";

const client = new Myntkaup();

for await (const entry of client.transactions.listAll({ from: "2026-01-01T00:00:00Z" })) {
  for (const change of entry.changes) {
    console.log(entry.created_at, entry.type, change.asset, change.amount, change.balance_after);
  }
}

from myntkaup import Myntkaup

client = Myntkaup()

for entry in client.transactions.list_all(from_="2026-01-01T00:00:00Z"):
    for change in entry["changes"]:
        print(entry["created_at"], entry["type"], change["asset"], change["amount"], change["balance_after"])

Keeping a copy up to date#

Lists are newest first. To sync incrementally, remember the newest id you've stored, then page from the start until you reach it:

import csv
from pathlib import Path

from myntkaup import Myntkaup

client = Myntkaup()
state = Path("last_id.txt")
last_seen = state.read_text().strip() if state.exists() else None

new_entries = []
for entry in client.transactions.list_all():
    if entry["id"] == last_seen:
        break
    new_entries.append(entry)

with open("ledger.csv", "a", newline="") as file:
    writer = csv.writer(file)
    for entry in reversed(new_entries):  # oldest first
        for change in entry["changes"]:
            writer.writerow(
                [entry["created_at"], entry["id"], entry["type"], entry["label"],
                 change["asset"], change["amount"], change["balance_after"]]
            )

if new_entries:
    state.write_text(new_entries[0]["id"])

Run it every few minutes at most. For a first full download, ask year by year with from and to: a request covers at most 366 days.

Prices for valuation#

GET/v1/prices returns buy and sell prices for every asset at your tier in one call, cached for a second. Use it to value balances instead of asking per asset.