`invalid_exact_evm_scheme`

The payment or the requirements name a scheme other than exact.


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

Cause

The exact EVM verifier received a payload or requirements whose scheme is not exact.

Fix

Make sure the payload's accepted option and the seller's requirements both say scheme: "exact", or route other schemes to a facilitator that supports them.

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.