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PostCash operates on two distinct levels that must be understood separately.

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Level 1 — Platform Layer

At the platform layer, PostCash charges instance operators for infrastructure usage.
  • Creation fee — Merchant, per funded cheque. Collected via on-chain SPL delegate transfer.
  • Claim fee — End-user, deducted from cheque value. Embedded in the on-chain transaction.
  • Changelly markup — End-user, via inflated exchange rate. Built into the Changelly quote.
  • Bridge developer fee — End-user, added to the USD amount. Collected by Bridge.xyz and remitted.
  • Breakage (future) — Merchant, for expired funded cheques. Planned for Phase 2.

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Level 2 — Distribution Layer

At the distribution layer, the instance acts as the Issuer and distributes USDC cheques through a merchant network under an agency agreement. The cheque face value is treated as a commodity: merchants take it on consignment, incur obligations, and settle with the issuer periodically.

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Complete Billing Flow

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Summary

PostCash billing is split into two parallel models:
  • The platform layer captures infrastructure and transaction-related fees.
  • The distribution layer governs how issuers, merchants, settlements, and rebates work operationally.