> ## Documentation Index > Fetch the complete documentation index at: https://learn.breezing.io/llms.txt > Use this file to discover all available pages before exploring further. # Calculate Net Gain/Loss API > Recompute Breezing realized and unrealized net gain or loss across crypto transactions using the company's cost basis method. ## OpenAPI ````yaml POST /ngl/calculate openapi: 3.1.0 info: title: Breezing Public API version: 1.0.0 description: >- Crypto accounting API for programmatic access and AI agents. Authenticate with an API key using the Authorization header: `Bearer brz_...` servers: - url: https://api.breezing.io/v1 security: - BearerAuth: [] paths: /ngl/calculate: post: tags: - Net Gain Loss summary: Recompute net gain/loss description: >- Recompute net gain/loss (cost basis) for the company. Long-running background job that walks every unlocked transaction in scope, applies the selected cost-basis method (average / FIFO / LIFO / HIFO), and writes the resulting realized/unrealized gain or loss back onto each transaction. Returns immediately once the jobs are queued; poll GET /tasks for `operation: "netGainLoss"` (or `operation: "netGainLossPrep1"` while a lot-based method is preparing) to monitor progress. **Duplicate-run protection:** if a `netGainLoss` or `netGainLossPrep1` task is already in `pending` or `progress` status for this company, this endpoint returns 409 CONFLICT. NEVER let two NGL recomputes run in parallel for the same company. The cost-basis math depends on processing transactions in deterministic order, and overlapping runs produce inconsistent values. Always call GET /tasks first. If `method` and `isPerWallet` are omitted, the endpoint uses the company's configured defaults (companies.accountingMethod and companies.accountingIsPerWallet). parameters: - schema: type: string description: >- Organization ID. Use GET /v1/companies to discover available org/company pairs. example: '1' required: true description: >- Organization ID. Use GET /v1/companies to discover available org/company pairs. name: orgId in: query - schema: type: string description: >- Company ID. Use GET /v1/companies to discover available companies and their access levels. example: '1' required: true description: >- Company ID. Use GET /v1/companies to discover available companies and their access levels. name: companyId in: query requestBody: content: application/json: schema: $ref: '#/components/schemas/CalculateNglBody' responses: '200': description: Recompute queued content: application/json: schema: type: object properties: success: type: boolean enum: - true data: type: object properties: started: type: boolean enum: - true method: type: string enum: - average - fifo - lifo - hifo isPerWallet: type: boolean note: type: string required: - started - method - isPerWallet - note required: - success - data '400': description: >- Invalid input (e.g. isPerWallet=true without wallets, or toDate in an invalid format) content: application/json: schema: type: object properties: success: type: boolean enum: - false error: type: object properties: code: type: string message: type: string required: - code - message required: - success - error '401': description: Invalid or missing API key content: application/json: schema: type: object properties: success: type: boolean enum: - false error: type: object properties: code: type: string message: type: string required: - code - message required: - success - error '403': description: >- API key has no access to this company, has read-only access where write was required, or the company subscription is inactive content: application/json: schema: type: object properties: success: type: boolean enum: - false error: type: object properties: code: type: string message: type: string required: - code - message required: - success - error '409': description: A net gain/loss recompute is already running for this company content: application/json: schema: type: object properties: success: type: boolean enum: - false error: type: object properties: code: type: string message: type: string required: - code - message required: - success - error '500': description: Internal server error content: application/json: schema: type: object properties: success: type: boolean enum: - false error: type: object properties: code: type: string message: type: string required: - code - message required: - success - error security: - BearerAuth: [] components: schemas: CalculateNglBody: type: object properties: method: type: string enum: - average - fifo - lifo - hifo description: >- Cost-basis method. If omitted, uses the company's configured default (companies.accountingMethod). Changing this overrides the default for this run only. isPerWallet: type: boolean description: >- When true, NGL is computed separately per wallet rather than pooled across all wallets per token. If omitted, uses the company's configured default (companies.accountingIsPerWallet). Setting true requires `wallets` to be a non-empty array. tokens: type: array items: type: string description: >- Optional list of token symbols to include. Omit (or pass an empty array) to include ALL tokens. Note this is heavier and may take significantly longer. wallets: type: array items: type: integer minimum: 0 exclusiveMinimum: true description: >- Wallet IDs to include. Required when `isPerWallet` is true. Ignored otherwise. toDate: type: string pattern: ^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$ description: >- Optional cutoff datetime in format "YYYY-MM-DD HH:mm:ss" (e.g. "2025-12-31 23:59:59"). When provided, NGL is calculated as of this datetime, useful for period-end closes. Omit to use the current time. example: '2025-12-31 23:59:59' ````