> ## Documentation Index > Fetch the complete documentation index at: https://docs.fincept.in/llms.txt > Use this file to discover all available pages before exploring further. # Calculate Basel III Capital Ratios > Calculates all Basel III regulatory capital ratios including CET1 (Common Equity Tier 1), Tier 1, Total Capital, and optionally the Leverage Ratio. Compares results against minimum regulatory requirements (CET1 >= 4.5%, Tier 1 >= 6%, Total >= 8%) and returns compliance flags. Use this for regulatory capital adequacy assessments, board reporting, and supervisory submissions. The leverage ratio (Tier 1 / Total Exposure) is only calculated if total_exposure is provided. [Tier: ENTERPRISE, Credits: 10] ## OpenAPI ````yaml api-specs/regulatory.json post /quantlib/regulatory/basel/capital-ratios openapi: 3.1.0 info: title: FinceptQuantLib API - Regulatory description: >- Pro-tier regulatory compliance and capital adequacy endpoints covering Basel III capital ratios and RWA calculations, SA-CCR counterparty credit risk exposure metrics, IFRS 9 expected credit loss provisioning, liquidity coverage ratios (LCR/NSFR), and stress testing capital projections. All endpoints require Pro tier access and consume 5 credits per request. version: 3.0.0 contact: name: Fincept API Support url: https://fincept.in servers: - url: https://api.fincept.in description: Fincept API Production Server security: - APIKeyHeader: [] tags: - name: quantlib-regulatory description: >- Regulatory compliance and capital adequacy calculations for Basel III, SA-CCR, IFRS 9, liquidity ratios, and stress testing. Pro tier required. x-displayName: Regulatory paths: /quantlib/regulatory/basel/capital-ratios: post: tags: - quantlib-regulatory summary: Calculate Basel III Capital Ratios description: >- Calculates all Basel III regulatory capital ratios including CET1 (Common Equity Tier 1), Tier 1, Total Capital, and optionally the Leverage Ratio. Compares results against minimum regulatory requirements (CET1 >= 4.5%, Tier 1 >= 6%, Total >= 8%) and returns compliance flags. Use this for regulatory capital adequacy assessments, board reporting, and supervisory submissions. The leverage ratio (Tier 1 / Total Exposure) is only calculated if total_exposure is provided. [Tier: ENTERPRISE, Credits: 10] operationId: capital_ratios requestBody: required: true content: application/json: schema: type: object required: - cet1_capital - tier1_capital - total_capital - risk_weighted_assets properties: cet1_capital: type: number description: >- Common Equity Tier 1 capital (retained earnings, common shares, accumulated other comprehensive income, qualifying minority interests) example: 85000000 tier1_capital: type: number description: >- Total Tier 1 capital (CET1 + Additional Tier 1 such as perpetual non-cumulative preferred stock) example: 95000000 total_capital: type: number description: >- Total regulatory capital (Tier 1 + Tier 2 capital including subordinated debt, loan loss reserves) example: 120000000 risk_weighted_assets: type: number description: >- Total risk-weighted assets (credit RWA + market RWA + operational RWA) example: 950000000 total_exposure: type: number description: >- Total exposure measure for leverage ratio calculation (on-balance sheet + derivatives + securities financing). Optional. example: 1500000000 nullable: true examples: regional_bank: summary: Regional bank capital structure value: cet1_capital: 85000000 tier1_capital: 95000000 total_capital: 120000000 risk_weighted_assets: 950000000 total_exposure: 1500000000 investment_firm: summary: Investment firm (no leverage ratio) value: cet1_capital: 42000000 tier1_capital: 42000000 total_capital: 55000000 risk_weighted_assets: 480000000 responses: '200': description: Capital ratios calculated successfully content: application/json: schema: type: object properties: success: type: boolean example: true data: type: object properties: cet1_ratio: type: number description: >- Common Equity Tier 1 ratio (minimum regulatory requirement: 4.5%) example: 0.08947368421052632 tier1_ratio: type: number description: >- Tier 1 capital ratio (minimum regulatory requirement: 6%) example: 0.1 total_capital_ratio: type: number description: >- Total capital ratio (minimum regulatory requirement: 8%) example: 0.12631578947368421 leverage_ratio: type: number description: >- Leverage ratio (Tier 1 / Total Exposure), only present if total_exposure provided. Minimum: 3% example: 0.06333333333333334 cet1_adequate: type: boolean description: Whether CET1 ratio meets minimum 4.5% requirement example: true tier1_adequate: type: boolean description: Whether Tier 1 ratio meets minimum 6% requirement example: true total_adequate: type: boolean description: >- Whether Total Capital ratio meets minimum 8% requirement example: true examples: well_capitalized: summary: Well-capitalized institution value: success: true data: cet1_ratio: 0.08947368421052632 tier1_ratio: 0.1 total_capital_ratio: 0.12631578947368421 leverage_ratio: 0.06333333333333334 cet1_adequate: true tier1_adequate: true total_adequate: true '401': $ref: '#/components/responses/UnauthorizedError' '402': $ref: '#/components/responses/InsufficientCreditsError' '422': $ref: '#/components/responses/ValidationError' components: responses: UnauthorizedError: description: Authentication information is missing or invalid content: application/json: schema: type: object properties: detail: type: string example: Invalid API key InsufficientCreditsError: description: Insufficient API credits to complete request content: application/json: schema: type: object properties: detail: type: string example: Insufficient credits. This endpoint requires 5 credits. ValidationError: description: Request validation error content: application/json: schema: type: object properties: detail: type: array items: type: object properties: loc: type: array items: type: string msg: type: string type: type: string example: detail: - loc: - body - cet1_capital msg: field required type: value_error.missing securitySchemes: APIKeyHeader: type: apiKey in: header name: X-API-Key description: >- API key for authentication. Get your key at https://api.fincept.in/auth/register ````