Billing & PAX FAQ
Questions about how Matrix prices usage — PAX, the rate card, the free tier, bring-your-own-key, receipts, and agent balances.
PAX is the Paxeer Network unit Matrix uses to price LLM usage in the credit ledger. Rates are derived from the underlying USD provider prices at a fixed PAX reference.
The gateway looks up the model in a versioned rate card, prices input/output tokens, and debits your credit ledger. Each ledger row records the rate-table version used, so historical costs replay byte-identically after a reprice.
Yes — a per-day PAX allowance covers a whitelist of default models per slot (compiler / executor). Models outside the whitelist require bringing your own provider key via X-Matrix-BYO-API-Key.
Through LayerX: deposit, pay, fetch a signed receipt, withdraw, settle. Balances separate available vs reserved funds. Marketplace calls on Deus produce EIP-712 receipts and support payment channels + co-signed vouchers.
Money-moving endpoints accept an Idempotency-Key, so a retried invoke won't double-charge.