> For the complete documentation index, see [llms.txt](https://docs.kuma.bond/kuma-protocol/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.kuma.bond/kuma-protocol/ressources/user-guides/managing-transactions-on-evm-chains.md).

# Managing transactions on EVM chains

Transactions on the EVM blockchains are validated thanks to a consensus of miners or validators (depending on the blockchain). They can clear very fast, take a long time, or even fail. This page helps you understand why that happens.

### **Understanding the different transaction status**

On the EVM blockchains, everything starts by submitting a transaction - which can then succeed, fail or be replaced:

### **⛽ Transaction Status - Gas Cost Overview**

<table><thead><tr><th align="center">Statuts</th><th align="center">Gas cost Incurred &#x26; satuts</th><th data-hidden></th></tr></thead><tbody><tr><td align="center">Submitted</td><td align="center">Expected cost (not paid yet)</td><td></td></tr><tr><td align="center">Success</td><td align="center">Actual Gas Cost (lower than expected)</td><td></td></tr><tr><td align="center">Failed</td><td align="center">The gas cost is still incurred</td><td></td></tr><tr><td align="center">Canceled or Replaced</td><td align="center">No gas cost incurred</td><td></td></tr></tbody></table>

### **Why do transactions fail?**

If the gas price of a given transaction is too low to be picked up within a reasonable amount of time, your transaction will most likely fail because of the price changed.

Transaction can fail for various a range of other reasons, such as invalid input parameters

### **What happens when several transactions are on the same nounce?**

On top of all their other parameters, transactions are submitted with a “nounce”. The nounce represents the order of transaction made by an address -- it increases with each transaction.\
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Several transactions can be submitted on the same as long as no transaction was cleared on that nounce yet. In such a case, once the first transaction succeeds (most likely one with the highest gas price), all others will be “dropped and replaced”.

{% hint style="success" %}
It means that to replace or cancel a transaction that has not been validated yet, you can submit another one on the same nounce with a higher gas cost than the original.
{% endhint %}