`invalid_exact_evm_authorization_value`

The signed amount is not exactly the quoted amount.


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

Cause

In the exact scheme the authorization value must equal the required amount in atomic units. Paying more or less both fail.

Fix

Buyer: sign for the quote's amount exactly, as an atomic-unit string. For USDC, 1000 is 0.001 USDC.
Seller: do not change the price between quoting and verifying. The price-bump scenario shows what a buyer sees when a seller does.

Reproduce it

The Price changes after you pay scenario on this site exercises this situation.

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.