# South Korea Korea: Monetary Base, Average Balance, Seasonally Adjusted (BOK)

South Korea Korea: Monetary Base, Average Balance, Seasonally Adjusted (BOK) was up 4.5% year on year in September 2026, compared with 6.8% in August 2026.
The level stood at 309,951 KRW bn.
That is the lowest reading since September 2024.
Over the past ten years it has ranged from −3.4% (Oct 2023) to 19.5% (Feb 2021), averaging 8.8%.

- Source agency: Bank of Korea
- Makrognosis code: `KR.MONBASE.M.SA`
- Frequency: monthly
- Units: KRW bn
- Coverage: 2003-10-01 to 2026-09-01 (276 observations)
- Page: https://makrognosis.robomacro.com/data/south-korea/korea-monetary-base-average-balance-seasonally-adjusted-bok

## Recent data

| Period | Value | Y/Y % |
|---|---:|---:|
| September 2026 | 309,951 KRW bn | 4.5 |
| August 2026 | 311,149 KRW bn | 6.8 |
| July 2026 | 314,909 KRW bn | 8.5 |
| June 2026 | 313,667 KRW bn | 8.6 |
| May 2026 | 309,249 KRW bn | 8.4 |
| April 2026 | 306,015 KRW bn | 8.3 |
| March 2026 | 307,246 KRW bn | 7.8 |
| February 2026 | 303,270 KRW bn | 7.0 |
| January 2026 | 303,624 KRW bn | 8.2 |
| December 2025 | 298,663 KRW bn | 7.4 |
| November 2025 | 300,169 KRW bn | 9.3 |
| October 2025 | 297,023 KRW bn | 7.5 |
| September 2025 | 296,698 KRW bn | 8.6 |
| August 2025 | 291,373 KRW bn | 6.4 |
| July 2025 | 290,233 KRW bn | 5.7 |
| June 2025 | 288,825 KRW bn | 7.1 |
| May 2025 | 285,261 KRW bn | 5.8 |
| April 2025 | 282,626 KRW bn | 5.8 |
| March 2025 | 284,887 KRW bn | 5.9 |
| February 2025 | 283,457 KRW bn | 6.9 |
| January 2025 | 280,704 KRW bn | 6.1 |
| December 2024 | 278,094 KRW bn | 5.9 |
| November 2024 | 274,588 KRW bn | 6.1 |
| October 2024 | 276,291 KRW bn | 5.3 |

## API

```
curl -H "X-API-Key: $MAKROGNOSIS_KEY" \
  "https://makrognosis.robomacro.com/v1/series/KR.MONBASE.M.SA"

# Python
import requests
r = requests.get("https://makrognosis.robomacro.com/v1/series/KR.MONBASE.M.SA",
                 headers={"X-API-Key": KEY})
obs = r.json()["observations"]
```