SPEI vs ACH: Cross-Border Payment Methods Compared

SPEI (Sistema de Pagos Electrónicos Interbancarios) is Mexico’s real-time gross settlement system operated by Banco de México. SPEI transfers settle in seconds, operate Monday-Friday 7am-5:30pm CT, and cost approximately 0.2% per transaction on Cantarell OS. SPEI is the backbone of B2B payments in Mexico’s fuel industry.

ACH (Automated Clearing House) is the US batch payment system. Standard ACH settles in 1-2 business days, same-day ACH settles by end of day, and FedNow (24/7/365 instant) is the newest option. Cantarell OS charges 0.8% for standard ACH and 0.5% for wire transfers.

For US-Mexico fuel trade, the optimal strategy depends on urgency and volume: (1) Standard operations: SPEI for MXN + ACH for USD, settled through Cantarell’s virtual accounts, (2) Urgent settlements: FedNow (USD side) + SPEI (MXN side) for near-instant bilateral settlement, (3) High-volume: FX forward contracts to lock exchange rates for 30/60/90 days, eliminating currency risk.

Cantarell OS unifies SPEI, ACH, wire, and FedNow in a single platform with automatic reconciliation, 5-currency support (MXN/USD/CAD/BRL/COP), and idempotent payment processing that prevents duplicate charges.