---
title: "Submit a transaction for execution units evaluation (additional UTXO set)"
method: POST
path: "/utils/txs/evaluate/utxos"
tags: ["Cardano » Utilities"]
---

# Submit a transaction for execution units evaluation (additional UTXO set)

`POST /utils/txs/evaluate/utxos`

Submit a JSON payload with transaction CBOR and additional UTXO set to evaluate how much execution units it requires.

<p>
  <span class="hosted">Hosted</span> Endpoint only available for hosted variant.
</p>

## Query parameters

- `version` number

## Headers

- `Content-Type` 'application/json', required

## Request body

- object
  - `cbor` string, required — Transaction CBOR (encoded using base64 or base16).
  - `additionalUtxoSet` array[] — Additional UTXO as an array of tuples [TxIn, TxOut]. See https://ogmios.dev/mini-protocols/local-tx-submission/#additional-utxo-set.
    - union[]
      - union
        - object — TxIn
          - `txId` string — Transaction hash for the input
          - `index` number — Index of the output within the transaction
        - object — TxOut
          - `address` string, required — Output address
          - `value` object, required
            - `coins` number, required — Lovelace amount
            - `assets` object — Assets amount
          - `datum_hash` string
          - `datum` object
          - `script` object

## Response `200`

Returns result of EvaluateTx function from Ogmios see [EvaluateTx](https://ogmios.dev/mini-protocols/local-tx-submission/#evaluatetx) and [API reference (EvaluateTxResponse)](https://ogmios.dev/api/) for related errors.

- object

## Other responses

- `400` — Bad request
- `403` — Authentication secret is missing or invalid
- `404` — Component not found
- `418` — IP has been auto-banned for extensive sending of requests after usage limit has been reached
- `425` — Mempool is already full, not accepting new txs straight away
- `429` — Usage limit reached
- `500` — Internal Server Error

---

[API](https://skmtc.net/txpipe/apis/blockfrost-io-api-documentation.md) · [All operations](https://skmtc.net/txpipe/apis/blockfrost-io-api-documentation/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/txpipe/blockfrost-io-api-documentation/revisions/4a2f67b16876/schema)