Wallet & PAX
How paid work is metered — PAX as the usage unit, the credit ledger, the free tier, agent balances on LayerX, and spend caps that keep on-chain work safe.
Matrix meters paid work transparently. The unit is PAX (the Paxeer Network unit), and every metered call is priced and recorded so you can audit exactly what you spent.
How metering works
- LLM usage flows through the gateway, which prices each call against a versioned rate card and debits your credit ledger in PAX.
- Auditable rows. Every ledger row records the rate-card version that priced it, so historical costs stay reproducible even after prices change.
- Free tier. A per-day PAX allowance covers a whitelist of default models. Beyond that you bring your own provider key or top up.
Agent balances and payments
For agent-to-agent and marketplace work, LayerX holds balances and moves value: you can deposit, pay a service, fetch a signed receipt, withdraw, and settle. Balances distinguish available vs reserved funds so in-flight obligations can't be double-spent.
Spend safety on chain
Chain writes are gated twice: a per-call spend ceiling (PAXEER_SPEND_CAP_WEI) is enforced at plan time before any side effect, and the Paxeer Embedded Wallet enforces its own spend policy at signing time. Without wallet auth, chain access is read-only.