> ## Documentation Index
> Fetch the complete documentation index at: https://digraphsas-docs-cli.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Migrate Augustus v5 to v6.2

> Contract-integrator upgrade: calldata diffs, removed TokenTransferProxy, parameter renames.

## What breaks if you do nothing

Calldata returned by `POST /transactions` now targets Augustus v6.2 by default. If your contract integration hardcoded the v5 router or `TokenTransferProxy` address, those approvals and contract calls will silently route to a deprecated surface.

## High-level diffs

* `TokenTransferProxy` is gone. v6.2 pulls tokens directly via the router contract, so ERC-20 approvals must be granted to the v6.2 router address, not to a separate proxy.
* `excludeContractMethodsWithoutFeeModel` has been renamed (see the new param list in [API Reference](/api-reference/market/overview)).
* Method signatures changed: v6.2 introduces `swapExactAmountIn` and `swapExactAmountOut` as canonical entry points, and v5's `multiSwap`/`megaSwap` are deprecated.

## Steps

1. Look up the v6.2 router address per chain on [Chains & contracts](/resources/chains-and-contracts).
2. Re-grant ERC-20 approvals to the v6.2 router. Revoke the legacy v5 TokenTransferProxy approval if you want cleanup.
3. If you decode calldata server-side, regenerate ABIs against v6.2.
4. Update any hardcoded contract-method names in your dApp.

## End-state check

`GET /prices` response → `priceRoute.version` is `"6.2"` and `priceRoute.contractAddress` matches the v6.2 router for the chain.