---
title: "Changes to Preview Transaction"
method: POST
path: "/transaction/preview"
---

# Changes to Preview Transaction

`POST /transaction/preview`

> Every recorded change to this endpoint, newest first.

## Timeline

Changed in 4 of 50 revisions.

- **2024-11-12** `b934f6eb79ca` — 13 info
- **2024-09-17** `56ef410d77af` — 3 info
- **2024-06-25** `eb87d151be36` — 2 info
- **2024-05-14** `7601c23b1af1` — 1 info

## Changes

- **2024-11-12** `b934f6eb79ca` — 13 info
  - the request property `end_epoch_exclusive` became optional
  - the request property `flags` became optional
  - the request property `flags/assume_all_signature_proofs` became optional
  - the request property `flags/skip_epoch_check` became optional
  - the request property `flags/use_free_credit` became optional
  - the request property `nonce` became optional
  - the request property `signer_public_keys` became optional
  - the request property `start_epoch_inclusive` became optional
  - the request property `tip_percentage` became optional
  - the `assume_all_signature_proofs` request property default value `false` was added
  - the `disable_auth_checks` request property default value `false` was added
  - the `skip_epoch_check` request property default value `false` was added
  - the `use_free_credit` request property default value `false` was added
- **2024-09-17** `56ef410d77af` — 3 info
  - added the new optional request property `opt_ins`
  - added the optional property `radix_engine_toolkit_receipt` to the response with the `200` status
  - response property `encoded_receipt` deprecated
- **2024-06-25** `eb87d151be36` — 2 info
  - added the new optional request property `flags/disable_auth_checks`
  - added the new optional request property `message`
- **2024-05-14** `7601c23b1af1` — 1 info
  - added `AccountLockerNotFoundError` discriminator mapping keys to the `details` response property for the response status `4XX`

---

[Operation](https://skmtc.dev/radixdlt/apis/radix-gateway-api-babylon/docs/transaction/preview/post.md) · [API](https://skmtc.dev/radixdlt/apis/radix-gateway-api-babylon.md) · [Page](https://skmtc.dev/radixdlt/apis/radix-gateway-api-babylon/changes/transaction/preview/post)