Sponsor banks and BIN sponsorship: what the card rules and bank examiners say

What sponsorship means in acquiring

Card transactions settle through a card-network member. Guidance written for US bank examiners by the Office of the Comptroller of the Currency (OCC) says an acquiring bank that is a member of a card network must sponsor a merchant that accepts that network’s cards, and that the acquiring bank generally owns the identification number through which settlement takes place.

Visa’s rules, in the edition of 24 October 2026, use sponsor in a narrower sense: a member or non-member administrator that is responsible, in part or whole, for other members of Visa. A sponsored member is a member whose right to take part in Visa depends on another member. In everyday use, sponsor bank covers both: the bank behind a merchant portfolio, and the bank behind a smaller member or a payment company that is not a member at all.

The phrase BIN sponsorship is also used for card issuing, where a bank lets a programme manager issue cards on its number. The examiners’ handbook treats issuing rent-a-BIN arrangements as outside its scope, and so does this guide: it covers the acquiring side, where merchants are signed and settled.

BIN or acquiring identifier: the number being sponsored

Industry usage calls the acquirer’s number a BIN, and the examiners’ handbook does too: the BIN is assigned by Visa and the ICA number by Mastercard, each a member’s unique number for clearing and settlement. Visa’s current rules separate the two sides. A BIN is the issuer’s number at the start of a card number; an acquiring identifier is a 6-digit identifier licensed by Visa to an acquirer and used to identify it.

Under rule 1.2.1.3, a licensee must not sell, rent or exchange any BIN or acquiring identifier, and must notify Visa of a portfolio sale or merger. In the US, Visa’s rules add that a sponsor may limit its liabilities for its sponsored members as Visa U.S.A.’s certificate of incorporation and by-laws specify.

Rent-a-BIN, as bank examiners describe it

The OCC handbook names one arrangement directly. In rent-a-BIN, an acquiring bank permits an ISO or member service provider to use the bank’s Visa BIN or Mastercard ICA number to settle merchant card transactions. The bank has minimal operational involvement, the ISO keeps most of the income, and the bank receives a fee for the use of the number.

The handbook is clear about where the risk sits: the acquiring bank that owns the number always retains the risk of loss and responsibility for settlement with the card network. It tells bank management to oversee and control the arrangement rigorously, even where the ISO shares in the liability, and its examination request list names rent-a-BIN partners, with ISOs and significant merchants, among the counterparties whose credit risk the bank should review annually.

The two sources describe the same structure from different sides. The examiners’ word rent describes the commercial arrangement between bank and ISO; Visa’s rule forbids the licensee to sell, rent or exchange the number itself. In every model the identifier stays licensed to the member, which stays answerable to Visa for it.

Registration: what the sponsor must tell the card network

A member must register each third party agent with Visa before the agent performs any contracted services or transaction activity, and Visa may deny or reject a registration at any time, with or without cause (rule 1.9.8.6). An acquirer must also register an agent engaged by any of its merchants, and registration is specific to each acquirer: an agent working with two acquirers is registered twice (rule 1.9.8.7).

From 24 October 2026, in the US and Canada, the registration must also disclose the agent’s identifiers, and every issuing identifier, acquiring identifier, BIN and account range the agent uses for the member, including for merchant-facing programmes. The member must keep that information accurate and review it every year, after any change, or when Visa asks.

An agent that serves only its own member affiliates owning at least 25% of it is exempt from registration, but the exemption does not apply to payment facilitators, marketplaces and certain other models.

What changes for high-risk portfolios

Where a payment facilitator signs merchants that Visa classifies as high-integrity risk, the acquirer’s agreement with it must require a senior officer of the payment facilitator to sign each such sponsored-merchant agreement, and must require the payment facilitator to report new high-integrity risk merchants and their monthly transaction activity (rule 10.4.6.1).

Visa may require the acquirer to contract directly with a sponsored merchant that has generated excessive disputes or credits within 12 months, or that takes action to evade responsibility for compliance with the Visa Rules, and may disqualify a high-integrity risk payment facilitator or sponsored merchant under its acquirer monitoring programme (rule 10.4.6.2).

The bank’s side: third-party oversight

In June 2023 the Federal Reserve, the FDIC and the OCC published joint guidance on how banks manage third-party relationships. It names merchant payment processing services among the relationships it covers, and says a bank is responsible for conducting its activities in compliance with applicable laws and regulations, including activities involving third parties: the use of third parties does not abrogate those responsibilities.

For an ISO or payment facilitator, that is why a sponsor bank’s questions reach past its own merchants: the bank answers to its examiners for the partner’s activity, and to the card network for the identifier the partner uses.

• Who holds the identifier, and in whose name each merchant agreement is signed.
• Which card-network registrations the sponsor files for you, and when they must be in place.
• Who bears chargeback, fraud and settlement losses, and what reserve or collateral the sponsor holds against them.
• Which merchant categories the sponsor accepts, and what reporting it needs on high-integrity risk merchants.
• How the sponsor reviews the relationship, and what happens to your merchants if it ends.

How this appears on Zolution

Zolution is a free marketplace (Zolution Standard membership costs nothing) where agents, intermediaries and direct banks can declare their coverage and send offers to merchants whose applications match it. Each offer states the provider type and the contracting company and its country, as the provider declares them, so a merchant can see who signs and which party it is dealing with. Zolution processes no payments, holds no funds and approves nobody: the provider and its sponsor decide.

Questions, answered