# `invalid_exact_evm_network_mismatch`

> The payment was made for a different network than the one quoted, or for one the facilitator does not know. What causes this x402 error and how to fix it.

The payment was made for a different network than the one quoted, or for one the facilitator does not know.

|  |  |
| --- | --- |
| Reported by | the facilitator, during verify |
| Usually fixed by | the buyer or the seller, depending on the cause |

## Cause

The network in the payment payload is not recognised, or differs from the network in the payment requirements.

## Fix

- Buyer: pay on the network named in the option you chose from `accepts`.
- Use CAIP-2 identifiers in x402 version 2, for example `eip155:8453` for Base and `eip155:84532` for Base Sepolia.

## About this reference

Causes are taken from the source of `@x402/evm` 2.31. Other facilitators and later versions may use the same code for slightly different checks. See [all x402 errors](https://x402testendpoint.com/errors).

Source: https://x402testendpoint.com/errors/invalid_exact_evm_network_mismatch