`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.


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.