Stablecoin is a cryptocurrency that is pegged to, or interchangeable with the value of an asset like gold or fiat currency.
The first stablecoin was Tether - originally called "Realcoin" - which launched in 2014. 
Classification of stablecoins
In general, stablecoins can be classified in three categories: off-chain collateralized, on-chain collateralized, and algorithmic. 
Off-chain collateralized stablecoins
On-chain collateralized stablecoins
Jax coin as a stablecoin
- Stablecoin. Crypto Markets Wiki
- Are stablecoins the future of crypto? In Jax.network blog on Medium.
- Brock Pierce Announces Dollar-backed Cryptocurrency 'Realcoin'. Coindesk.
- Algorithmic Stablecoins. Bitcoin Suisse.