> ## Documentation Index > Fetch the complete documentation index at: https://docs.engine.usesophic.com/llms.txt > Use this file to discover all available pages before exploring further. # Retrieve a fee > Retrieve a fee by ID, including its variants. ## OpenAPI ````yaml /openapi.json get /fees/{fee_id} openapi: 3.1.0 info: title: Sophic Engine API version: 0.1.0 servers: - url: https://api.engine.usesophic.com security: [] tags: - description: Retrieve accounts, statements, and account documents. name: accounts x-group: Accounts - description: Read the audit trail of platform activity. name: activity x-group: Activity - description: Obtain OAuth access tokens for the Engine API. name: auth x-group: Authentication - description: Inspect the authenticated user or service actor. name: identity x-group: Identity - description: Retrieve fee schedules and billing information. name: billing x-group: Billing - description: Browse instruments and tradable products. name: catalog x-group: Catalog - description: Track onboarding applications through completion. name: onboarding x-group: Onboarding - description: Manage customer records and related person data. name: customers x-group: Customers - description: List platform events and inspect individual occurrences. name: events x-group: Events - description: Read positions, transactions, and account holdings. name: holdings x-group: Holdings - description: Retrieve legal agreements and required disclosures. name: legal-documents x-group: Legal Documents - description: Access prices and market data for instruments. name: market-data x-group: Market Data - description: Manage deposits, withdrawals, and funding accounts. name: payments x-group: Payments - description: Retrieve returns, earnings, and performance metrics. name: performance x-group: Performance - description: Place and manage orders, quotes, and trades. name: trading x-group: Trading - description: Read position and account valuations over time. name: valuation x-group: Valuation - description: Configure webhook endpoints and inspect deliveries. name: webhooks x-group: Webhooks - description: Upload files and retrieve stored documents. name: files x-group: Files paths: /fees/{fee_id}: get: tags: - billing summary: Retrieve a fee description: Retrieve a fee by ID, including its variants. operationId: retrieve_fee_fees__fee_id__get parameters: - in: path name: fee_id required: true schema: title: Fee Id type: string responses: '200': content: application/json: schema: $ref: '#/components/schemas/Fee' description: OK '400': content: application/json: schema: $ref: '#/components/schemas/Error' description: Bad Request security: - HTTPBearer: [] components: schemas: Fee: properties: alias: description: Stable alias of the fee. title: Alias type: string chargeable_currencies: additionalProperties: $ref: '#/components/schemas/FeeChargeableCurrency' description: Fee amounts by chargeable currency. title: Chargeable Currencies type: object created_at: description: >- The timestamp (in [ISO-8601](https://www.iso.org/iso-8601-date-and-time-format.html) format) of when the resource was created. format: date-time title: Created At type: string description: anyOf: - type: string - type: 'null' description: Description of the fee. title: Description display_name: description: Display name of the fee. title: Display Name type: string fee_type: allOf: - $ref: '#/components/schemas/FeeType' description: Type of fee. id: description: Unique resource identifier. title: Id type: string modified_at: description: >- The timestamp (in [ISO-8601](https://www.iso.org/iso-8601-date-and-time-format.html) format) of when the resource was last modified. format: date-time title: Modified At type: string name: description: Internal name of the fee. title: Name type: string tax_rate: anyOf: - type: string - type: 'null' description: Tax rate applied to the fee. examples: - '0.20' title: Tax Rate transaction_type: anyOf: - type: string - type: 'null' description: Transaction type to which the fee applies. title: Transaction Type variants: description: Scoped variants of this fee. items: $ref: '#/components/schemas/FeeVariant' title: Variants type: array required: - created_at - modified_at - id - name - display_name - alias - description - tax_rate - fee_type - transaction_type - chargeable_currencies - variants title: Fee type: object Error: properties: code: description: A machine-readable error code. title: Code type: string context: additionalProperties: anyOf: - type: string - type: integer description: An optional object for adding extra context to the error. title: Context type: object x-remove-null-from-type-union: true detail: description: A human-readable description of the error. title: Detail type: string docs: description: A URL to documentation about this error code. title: Docs type: string x-remove-null-from-type-union: true params: description: An optional list of params that failed validation. items: $ref: '#/components/schemas/InvalidParam' title: Params type: array x-remove-null-from-type-union: true required: - detail - code title: Error type: object FeeChargeableCurrency: properties: unit_amount: description: Fee amount charged in this currency. examples: - '2.50' title: Unit Amount type: string required: - unit_amount title: FeeChargeableCurrency type: object FeeType: enum: - transaction - recurring properties: {} title: FeeType type: string FeeVariant: description: An immutable scoped slice of a fee. properties: created_at: description: >- The timestamp (in [ISO-8601](https://www.iso.org/iso-8601-date-and-time-format.html) format) of when the resource was created. format: date-time title: Created At type: string description: anyOf: - type: string - type: 'null' description: Authoring note; never used in matching. title: Description fee: description: The fee this variant scopes. title: Fee type: string id: description: Unique resource identifier. title: Id type: string instrument: anyOf: - type: string - type: 'null' description: Instrument-id scope. title: Instrument instrument_type: anyOf: - type: string - type: 'null' description: Instrument-type scope. title: Instrument Type modified_at: description: >- The timestamp (in [ISO-8601](https://www.iso.org/iso-8601-date-and-time-format.html) format) of when the resource was last modified. format: date-time title: Modified At type: string portfolio_type: anyOf: - type: string - type: 'null' description: Forward-looking portfolio-type scope key. title: Portfolio Type transaction_type: anyOf: - type: string - type: 'null' description: Triggering transaction type (transaction fees only). title: Transaction Type required: - created_at - modified_at - id - fee title: FeeVariant type: object InvalidParam: properties: code: description: A machine-readable error code. title: Code type: string detail: description: Human-readable detail for error. title: Detail type: string path: description: Path to the field name (or index if a list) that errored. items: anyOf: - type: integer - type: string title: Path type: array required: - path - detail - code title: InvalidParam type: object securitySchemes: HTTPBearer: scheme: bearer type: http ````