// GLOSSARY -- PAYMENTS & FINTECH

What is Payment Channel?

1 min read Updated

A payment channel is an off-chain protocol that enables multiple transactions between two parties with only two on-chain transactions — one to open the channel and one to close it, dramatically reducing costs.

WHY IT MATTERS

Payment channels are an early scaling solution. Two parties lock funds in a smart contract, exchange signed payment updates off-chain as many times as needed, and only settle the final balance on-chain. Thousands of payments for the cost of two transactions.

Bitcoin's Lightning Network is the most prominent payment channel network. On Ethereum, state channels extend the concept beyond simple payments to arbitrary state updates.

Payment channels have been partially superseded by rollups for general scaling, but remain useful for specific use cases: high-frequency micropayments, streaming payments, and bilateral trading relationships.

FREQUENTLY ASKED QUESTIONS

How do payment channels work?
Open: both parties deposit to a contract. Transact: exchange signed balance updates off-chain. Close: submit the latest signed state to the contract, which distributes funds accordingly.
What if someone cheats?
Payment channels include dispute mechanisms. If someone submits an old state, the other party can submit the latest state within a challenge period. Cheaters lose their deposit.
Are payment channels still relevant?
For specific use cases (Lightning Network micropayments), yes. For general scaling, rollups have become the dominant approach due to broader functionality and better UX.

FURTHER READING

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