---
title: "Network Rule Change Impact Assessor"
method: POST
path: "/v1/tools/assess_rule_change_impact"
tags: ["rule changes", "Visa", "Mastercard", "NACHA", "interchange impact", "compliance", "2026", "AP2"]
---

# Network Rule Change Impact Assessor

`POST /v1/tools/assess_rule_change_impact`

## Request

- Base URL: `https://ainumbers.co`
- URL: `https://ainumbers.co/v1/tools/assess_rule_change_impact`
- Auth: none declared

Models the estimated impact of 2025–2026 Visa, Mastercard, and NACHA rule changes on a transaction portfolio. Seven embedded rule changes covering CNP authentication, EMV fallback, authorisation optimisation, surcharge updates, NACHA fraud monitoring, and data security enforcement. Outputs volume affected, interchange impact, compliance actions, and timeline.

**Tool URL:** https://ainumbers.co/tools/230-network-rule-change-impact-assessor.html
**AP2/Policy Mandate export:** yes

## Request body

- object
  - `rule_change_id` string, required
  - `monthly_volume` integer, required
  - `average_ticket_usd` number, required
  - `channel_mix` string

## Response `200`

Successful tool execution result

- object
  - `rule_change_title` string
  - `impact_level` 'high' | 'medium' | 'low'
  - `transactions_affected_per_month` integer
  - `estimated_monthly_impact_usd` number
  - `estimated_annual_impact_usd` number
  - `compliance_actions` string[]
  - `implementation_timeline` unknown[]
    - unknown
  - `ap2_mandate` object

---

[API](https://skmtc.dev/ainumbers/apis/ainumbers-co-fintech-intelligence-suite.md) · [All operations](https://skmtc.dev/ainumbers/apis/ainumbers-co-fintech-intelligence-suite/llms.txt) · [OpenAPI document](https://skmtc.dev/ainumbers/apis/ainumbers-co-fintech-intelligence-suite/revisions/b462e4f5bb28?raw)