POA Network is an R&D organization as well as a network, and the xDai stable chain is a chain originally created by the POA Network. Other POA projects include BlockScout and TokenBridge (both recipients of Ecosystem Support from the Ethereum Foundation).
The first iteration of the xDai chain was modeled after the POA Network chain but included some important updates. xDai was created as the first stable chain, meaning payments and fees were all completely stable and predictable. It inherited the speed and low fees of POA, but allowed for many new kinds of use cases, creating rapid adoption in the community.
xDai has successfully moved to a permissionless model with POSDAO, making it more decentralized & ideal as a stable payment platform.
POA - Volatile
xDai - Stable
Limited to US Notaries
Open: Known Worldwide Organizations - moving to decentralized community
ETH-to-xDai Bridge, AMB bridge for projects
Proof of Autonomy (POA)
POSDAO (delegated Proof of Stake)
Limited with POA20
Very High - based on Dai liquidity
Developed tools, specialized usage
Advanced & User-Friendly tools like Burner Wallet, Splunk
Blocktime & Fees
5 seconds, low (volatile) fees
5 seconds, 500 tx for less than $.01
Games, subsidized transactions, no-loss savings lotteries
DeFi, stable payments, community currencies, DAO- based projects
The POA token is the native currency of the POA Core network. It is used to send transactions on the chain, and to pay fees for those transactions. Validators earn POA for each block that they seal. POA is a volatile token - the price changes based on market forces. This makes it challenging to use for payments as the value can change rapidly. In addition, POA can be bridged to the Ethereum mainnet and used as POA20.
STAKE is an entirely different kind of token - it is used to secure the underlying consensus of a chain. Validators and delegators use STAKE as collateral in a Proof-of-Stake consensus architecture. On the xDai chain, xDai is used for stable transactions (similar to POA, but as a stablecoin) and STAKE protects the underlying consensus (honest validators earn rewards, misbehaving validators are banned).
Transactions, fees, medium of exchange
Transactions, fees, medium of exchange, P2P payments
Initially xDai Network. Multi-chain capability in the future.
Variable, bridged from Dai