[0x] 0x
Veteran on-chain liquidity API powering swaps since 2017.
non-custodialno-kycdexsince 2017★4.7
0x is one of the oldest and most widely used DEX liquidity layers. Its Swap API aggregates liquidity across the major AMMs on each chain and returns a single best-execution route that settles on-chain in your wallet.
Because 0x is non-custodial infrastructure used by countless wallets and apps, it is a dependable, deeply liquid source for same-chain EVM swaps.
Pros
✓ Long track record (live since 2017)
✓ Deep same-chain EVM liquidity
✓ Non-custodial, wallet-signed
✓ No KYC
Cons
• Same-chain only — no built-in bridging
• EVM chains only
• Gas costs apply on Ethereum mainnet
Fees
0x charges no fee to the end user on a basic swap; you pay network gas and the pool spread. BestDEX's flat integrator fee is already included in the displayed amount.
Security & audits
Public audits folder in the official 0x-settler GitHub repo with reports from OpenZeppelin, Dedaub, Ourovoros and Bailsec; Trail of Bits among the named auditors.
✓ OpenZeppelin, Trail of Bits, Dedaub —
official audit page ↗FAQ
Is 0x safe?
0x is mature, audited, non-custodial infrastructure used across the industry since 2017. It does not hold funds; swaps execute from your wallet.
Does 0x charge a fee?
No end-user protocol fee on a standard swap — you pay gas and pool spread. BestDEX shows the net amount after our flat fee.
Which chains does 0x support?
Ethereum and the major EVM layer-2s. It does not bridge between chains.
Visit 0x ↗ Compare live rates →