Decode
Calldata becomes a sentence. ABI lookups, ERC-7730 clear-signing, and a custom decoder registry.
decode(envelope) ⇒
USDC.transfer(
0x742d…7E91,
250.00
) v0.1 · open spec · Apache 2.0
Verify before you sign.
Decode, preview, and simulate any Web3 transaction before it leaves the wallet. An open standard for transaction safety, built for the agent era, useful today for every dApp, multisig, and DAO.
7 packages on npm · Built on viem + wagmi · Open spec
Preview
See every state change before signing. Token transfers, allowance grants, NFT moves, gas costs.
preview(envelope) ⇒ -250.00 USDC -0.00012 ETH gas +allowance: 0
Simulate
Catch reverts before they cost gas. Forked-state simulation surfaces slippage and MEV exposure.
simulate(envelope) ⇒ status: ok trace: 4 calls mev_risk: low
verify-tx.tsx
import { TxKitProvider, TxApproval } from '@txkit/react'
import { verify } from '@txkit/sdk'
import '@txkit/themes/dark.css'
const result = await verify(preparedTx, { apiKey })
<TxKitProvider config={config}>
<TxApproval
envelope={preparedTx}
verification={result}
onApprove={(receipt) => console.log(receipt)}
/>
</TxKitProvider>Useful today
- dApp developers Drop in TxApproval, SwapApproval, BridgeApproval
- DAOs and multisigs Decode + preview before Safe co-signers vote
- DeFi frontends CollateralRiskBadge, allowance hygiene, slippage
- Wallets Drop-in transaction review surface
Built for the agent era
- AI agents Propose tx with PreparedEnvelope + agentContext
- Per-agent allowances Token + destination + function + amount + period
- Stablecoin payments x402 (Coinbase), Skyfire, Lightspark Grid
- ERC-7715 Scoped wallet capabilities + permission contexts
PreparedTx is an open standard.
Any wallet, any dApp, any agent.
CAIP-2 EIP-5792 EIP-712 ERC-7730 ERC-7715
12 transaction kinds · 3 implemented + 9 reserved · open SDK in Apache 2.0
Read the spec →Verification primitives the protocols you already use.
Components
Compose-ready React components on top of the open spec.
<TxKitProvider /> Wraps your app with wagmi, viem, TanStack Query, and theme tokens.
Open in playground →<ConnectWallet /> Multi-wallet picker, ENS, balance, wrong-chain auto-switch.
Open in playground →<TokenBalance /> ERC-20 balance with decimals, polling, USD equivalent.
Open in playground →<TransactionButton /> Multi-step flow: approve, sign, wait. Compose any number of steps.
Open in playground →<FlowSteps /> Step indicator that reads tx state from TxKitProvider context.
Open in playground →<FlowToast /> Status toast with retry, explorer link, and reduced-motion support.
Open in playground →<TxApproval /> Review modal: decoded calldata, simulation result, risk badges.
v0.2 (forthcoming)<AllowanceGrant /> Grant a spending policy: token + destination + function + amount + period.
v0.2 (forthcoming)