---
title: "UK Critical Third Parties Exposure Mapper"
method: POST
path: "/v1/tools/map_uk_ctp_exposure"
tags: ["UK CTP", "critical third parties", "PRA PS16/24", "FCA PS24/16", "operational resilience", "third-party risk", "cloud concentration"]
---

# UK Critical Third Parties Exposure Mapper

`POST /v1/tools/map_uk_ctp_exposure`

## Request

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

Maps material and important business services onto the four UK-designated Critical Third Parties (effective 13 Jul 2026), splits CTP-owed vs firm-retained duties per PRA PS16/24 / FCA PS24/16 Fundamental Rules, and flags provider concentration and indirect chain exposure. Client-side. Works offline. Zero PII.

**Tool URL:** https://ainumbers.co/tools/638-uk-ctp-exposure-mapper.html
**AP2/Policy Mandate export:** yes

## Request body

- object

## Response `200`

Successful tool execution result

- object
  - `rows` unknown[]: Per-service provider match verdict, substitutability, and RTO
    - unknown
  - `hhi` number
  - `onCTPCount` number
  - `indirectCount` number

---

[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)