---
title: "ERBA / Standardized RWA Calculator (Basel Endgame 2026)"
method: POST
path: "/v1/tools/compute_rwa_erba_2026"
tags: ["TODO_TAGS_REVIEW", "TODO_AP2_EXPORT_REVIEW"]
---

# ERBA / Standardized RWA Calculator (Basel Endgame 2026)

`POST /v1/tools/compute_rwa_erba_2026`

## Request

- Base URL: `https://ainumbers.co`
- URL: `https://ainumbers.co/v1/tools/compute_rwa_erba_2026`
- Auth: none declared

Credit-risk expanded risk-based approach (ERBA) / standardized-approach RWA calculator per the 2026 Basel Endgame reproposal (BCBS/US NPR, reproposed 2026-03-19, comments closed 2026-06-18, final expected ~Q4 2026). Runs an exposure book -- residential real estate by LTV band, retail (QRRE transactor/revolver, other retail), corporate (ECRA external-rating or SCRA unrated), SME support factor, off-balance-sheet CCFs -- through a chosen rule_set (2023 original NPR or 2026 reproposal) and returns per-exposure risk weights, aggregate RWA, and a receipt. rule_status stays proposed until the rule finalizes. Feeds compare_basel_2023_vs_2026 for the versus-2023 capital delta.

**Tool URL:** https://ainumbers.co/chaingraph/art-355-erba-standardized-rwa-calculator.html

## Request body

- object
  - `exposures` unknown[], required
    - unknown
  - `rule_set` unknown, required

## Response `200`

Successful tool execution result

- object
  - `aggregate_rwa` integer
  - `average_risk_weight` number
  - `constants_version` string
  - `disambiguation` string
  - `exposure_count` integer
  - `per_exposure` object[]
    - `basis` string
    - `category` string
    - `credit_equivalent_amount` integer
    - `effective_risk_weight` integer
    - `exposure_amount` integer
    - `id` string
    - `risk_weight` integer
    - `rwa` integer
    - `sme_support_factor` integer
  - `rule_set` string
  - `rule_set_label` string
  - `rule_status` string
  - `table_source` string
  - `total_exposure_amount` integer

---

[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)