GLOBAL PAYMENTS KNOWLEDGEISO 20022 / SWIFT / SEPA / MT / MX
PAYMENTSSIGNAL

The interactive academy for the standards, messages, and rails that move money.

GET IN TOUCH
SPEI (MEXICO)

Queued at Banxico: a SPEI payment short of balance

Trigger: Bank Alfa lacks sufficient balance to settle a SPEI payment; SPEI does not extend credit or overdraw accounts.

Contributor Shubham Mathure

What operations sees first: A payment the customer expects in seconds does not settle immediately; SPEI holds it in a queue.

WHERE IS THE MONEY?

Debited from Riya but held in-flight until the payment settles; if the wait is long the bank may reverse and inform her.

DID SETTLEMENT HAPPEN?

Settlement was deferred until liquidity was available, then completed gross.

WHO ACTS NEXT?

Bank Alfa (sending bank) Bank Alfa manages its SPEI balance so customer payments do not queue.

PLAY THE EXCEPTION

Trigger: At the moment Bank Alfa's order reaches SPEI, Bank Alfa's balance does not cover MXN 2,000.00.

STEP 1 / 6MESSAGE

Riya instructs Bank Alfa with Arjun's CLABE

Riya (customer) → Bank Alfa (sending bank)

Riya asks Bank Alfa to send MXN 2,000.00 to Arjun, addressing the destination account by its CLABE — the 18-digit interbank account number that identifies the bank and the account. Nothing has moved yet; this is a request.

Step 1 of 6: Riya instructs Bank Alfa with Arjun's CLABE

  1. 01Message
    Riya instructs Bank Alfa with Arjun's CLABERiya (customer) → Bank Alfa (sending bank)
  2. 02Posting
    Bank Alfa validates and debits RiyaBank Alfa (sending bank)
  3. 03Message
    Bank Alfa submits the order to SPEIBank Alfa (sending bank) → SPEI (Banco de Mexico)
  4. 04 · EXCEPTION PATHProcessing
    SPEI queues the payment rather than settling itSPEI (Banco de Mexico)
  5. 05 · EXCEPTION PATHProcessing
    Incoming funds top up Bank Alfa's balanceBank Alfa (sending bank)
  6. 06 · EXCEPTION PATHSettlement
    The queued payment settles once coveredBank Alfa (sending bank) → Nordbank (receiving bank)
  7. OUTCOME
    Funds
    Debited from Riya; Arjun is paid once the queued order settles.
    Settlement
    Settlement waited on liquidity — SPEI queued the order instead of overdrawing Bank Alfa or rejecting it.
    Who acts next
    Bank Alfa (sending bank) — Bank Alfa manages its intraday balance so orders settle promptly rather than sitting in the queue.
Full step-by-step text (works without JavaScript)
  1. 01Message
    Riya instructs Bank Alfa with Arjun's CLABERiya (customer) → Bank Alfa (sending bank)

    Riya asks Bank Alfa to send MXN 2,000.00 to Arjun, addressing the destination account by its CLABE — the 18-digit interbank account number that identifies the bank and the account. Nothing has moved yet; this is a request.

  2. 02Posting
    Bank Alfa validates and debits RiyaBank Alfa (sending bank)

    Bank Alfa checks the format, screens the payment, confirms Riya has the balance, then debits her account. The money has left Riya, but Arjun's bank does not have it yet — the message that follows carries information, not funds.

    • DR Riya's account at Bank Alfa — MXN 2,000.00

    Screening checkpoint: Outbound screening — Screening runs before the order is released, because SPEI settlement is fast and final once it happens.

  3. 03Message
    Bank Alfa submits the order to SPEIBank Alfa (sending bank) → SPEI (Banco de Mexico)

    Bank Alfa sends the payment order to SPEI, which verifies the message and checks the sending bank's digital signature. SPEI processes each order individually as it arrives rather than collecting orders into batches.

  4. 04 · EXCEPTION PATHProcessing
    SPEI queues the payment rather than settling itSPEI (Banco de Mexico)

    SPEI will not create money a participant does not have and does not overdraw the account, so it holds the order in a queue. The payment is not rejected — it simply waits for cover.

  5. 05 · EXCEPTION PATHProcessing
    Incoming funds top up Bank Alfa's balanceBank Alfa (sending bank)

    Incoming SPEI payments to Bank Alfa, or a deliberate liquidity transfer, raise its balance until it covers the queued order. Queued payments settle as soon as the balance is sufficient.

  6. 06 · EXCEPTION PATHSettlement
    The queued payment settles once coveredBank Alfa (sending bank) → Nordbank (receiving bank)

    With enough balance in place, SPEI takes the order off the queue and settles it individually in central-bank money, then Nordbank can credit Arjun and a CEP is issued.

    • DR Bank Alfa's balance at Banco de Mexico — MXN 2,000.00
    • CR Nordbank's balance at Banco de Mexico — MXN 2,000.00
  7. OUTCOME
    Funds
    Debited from Riya; Arjun is paid once the queued order settles.
    Settlement
    Settlement waited on liquidity — SPEI queued the order instead of overdrawing Bank Alfa or rejecting it.
    Who acts next
    Bank Alfa (sending bank) — Bank Alfa manages its intraday balance so orders settle promptly rather than sitting in the queue.

THE TIMELINE

  1. 01Riya
    Instructs an MXN 2,000.00 SPEI payment to Arjun using his CLABE; Bank Alfa debits her.
  2. 02SPEI (Banco de Mexico)
    Finds Bank Alfa lacks the balance to settle without overdrawing, so it queues the payment rather than rejecting it.

    SPEI never overdraws a participant; a payment lacking liquidity is queued until it can be processed.

  3. 03Bank Alfa
    Receives incoming SPEI credits or provides funds so its balance can cover the queued payment.
  4. 04Banco de Mexico
    Settles the released payment individually in central bank money within seconds; a CEP confirmation is issued.

Resolution: SPEI queues rather than overdraws. Once the balance can cover it, SPEI settles the payment gross in seconds. Queuing is a liquidity outcome, not an error.

LEARN THE CONCEPTS

Sources for this scenario2
  1. Official requirement

    SPEI (Interbank Electronic Payment System) ↗ — Banco de Mexico · queue / no overdraft

    Describes SPEI, the Interbank Electronic Payment System developed and operated by Banco de Mexico: a real-time gross settlement system that processes payment orders individually, typically settling within seconds; it does not extend credit or overdraw participants, and transfers lacking liquidity are queued until they can be processed. A CEP is issued as confirmation of a received payment. · Checked 2026-07-14

    SPEI settles gross in central bank money and queues payments that lack liquidity rather than overdrawing accounts.

  2. Simplified educational illustration

    Payments Signal editorial teaching models — Payments Signal

    This site's own simplified teaching models. · Checked 2026-07-12

    What this simplifies: Single-cycle teaching model; participant-specific handling and exact timings vary.

    Used wherever diagrams, scenarios, figures, or example values are didactic constructions rather than sourced facts; every such use carries a simplifications disclosure. All people, companies, banks, and list entries in examples are fictional.