> ## 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. # List on-the-run bills > Returns the on-the-run treasury bill for each standard maturity period of the given issuer country that currently has a matching bill. Periods with no matching bill are omitted from the response. ## OpenAPI ````yaml /openapi.json get /bills/otr 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: /bills/otr: get: tags: - catalog summary: List on-the-run bills description: >- Returns the on-the-run treasury bill for each standard maturity period of the given issuer country that currently has a matching bill. Periods with no matching bill are omitted from the response. operationId: get_on_the_run_bill_matrix_bills_otr_get parameters: - in: query name: issuer_country required: true schema: title: Issuer Country type: string responses: '200': content: application/json: examples: default: summary: EU on-the-run matrix with no 6m match value: 12m: days_to_maturity: 366 id: instrument_def456 instrument_type: bill isin: EU0000000011 issuer: EU issuer_country: EU maturity_date: '2024-10-04' name: EU 12M T-Bill 2024-10-04 symbol: EU0000000011 trading_currency: EUR 3m: days_to_maturity: 92 id: instrument_abc123 instrument_type: bill isin: EU0000000001 issuer: EU issuer_country: EU maturity_date: '2024-01-04' name: EU 3M T-Bill 2024-01-04 symbol: EU0000000001 trading_currency: EUR schema: additionalProperties: $ref: '#/components/schemas/Bill' title: Response Get On The Run Bill Matrix Bills Otr Get type: object description: Successful Response '400': content: application/json: schema: $ref: '#/components/schemas/Error' description: Bad Request security: - HTTPBearer: [] components: schemas: Bill: properties: about: anyOf: - type: string - type: 'null' description: Summary of the instrument. examples: - Common stock listed on the Nasdaq Global Select Market. title: About days_to_maturity: description: Calendar days remaining until maturity. examples: - 182 title: Days To Maturity type: integer decimal_precision: description: Decimal places used by the trading increment. examples: - 2 title: Decimal Precision type: integer enforce_trading_rules: description: Whether order amounts must satisfy the instrument trading rules. title: Enforce Trading Rules type: boolean exchange: anyOf: - type: string - type: 'null' description: MIC of the listing venue. examples: - XNAS title: Exchange icon_url: anyOf: - type: string - type: 'null' description: Public CDN URL of the instrument's icon. examples: - >- https://storage.googleapis.com/sophic-assets/instrument-icons/in_x7GqT.png title: Icon Url id: description: Unique resource identifier. title: Id type: string initial_auction_date: anyOf: - format: date type: string - type: 'null' description: Date of the first auction. examples: - '2024-12-30' title: Initial Auction Date initial_issue_date: description: Date the instrument was first issued. examples: - '2025-01-02' format: date title: Initial Issue Date type: string instrument_type: const: bill description: Instrument type. title: Instrument Type isin: description: International Securities Identification Number. examples: - US5949181045 title: Isin type: string issuer: description: Name of the issuer. examples: - United States Department of the Treasury title: Issuer type: string issuer_country: anyOf: - type: string - type: 'null' description: ISO 3166-1 alpha-2 country code of the issuer. examples: - US title: Issuer Country issuer_credit_rating: description: Issuer credit rating. examples: - AA+ title: Issuer Credit Rating type: string latest_auction_date: anyOf: - format: date type: string - type: 'null' description: Date of the latest auction, including tap issues. examples: - '2025-01-27' title: Latest Auction Date latest_issue_date: anyOf: - format: date type: string - type: 'null' description: Date of the latest issue, including tap issues. examples: - '2025-01-30' title: Latest Issue Date maturity_date: description: Date the instrument matures. examples: - '2025-07-03' format: date title: Maturity Date type: string minimum_initial_cash_investment: description: Minimum cash amount accepted for an initial investment. examples: - '1000.00' title: Minimum Initial Cash Investment type: string minimum_trading_quantity: description: Smallest quantity accepted for an order. examples: - '1.00' title: Minimum Trading Quantity type: string name: description: Display name of the instrument. examples: - Apple Inc. title: Name type: string price_type: allOf: - $ref: '#/components/schemas/PriceType' description: Price quotation type. pro_traders_only: description: Whether the instrument is restricted to professional investors. title: Pro Traders Only type: boolean required_cash_increment: description: Cash increment accepted above the minimum investment. examples: - 100 title: Required Cash Increment type: integer rollout_stage: anyOf: - $ref: '#/components/schemas/InstrumentRolloutStage' - type: 'null' description: Availability stage of the instrument. supports_automatic_rollover: description: Whether positions can roll over automatically at maturity. title: Supports Automatic Rollover type: boolean symbol: description: Market identifier, such as an ISIN or currency pair. examples: - US5949181045 title: Symbol type: string ticker: anyOf: - type: string - type: 'null' description: Ticker symbol of the security. examples: - AAPL title: Ticker trading_currency: allOf: - $ref: '#/components/schemas/Currency' description: Currency used to trade the instrument. examples: - USD trading_increment: description: Smallest quantity increment accepted for orders. examples: - '0.01' title: Trading Increment type: string trading_status: allOf: - $ref: '#/components/schemas/InstrumentTradingStatus' description: Current trading status. required: - id - name - symbol - instrument_type - trading_status - rollout_stage - trading_increment - decimal_precision - pro_traders_only - price_type - isin - issuer - issuer_country - minimum_trading_quantity - trading_currency - initial_issue_date - enforce_trading_rules - minimum_initial_cash_investment - required_cash_increment - maturity_date - days_to_maturity - supports_automatic_rollover - issuer_credit_rating - initial_auction_date - latest_auction_date - latest_issue_date title: Bill 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 PriceType: enum: - percent - money properties: {} title: PriceType type: string InstrumentRolloutStage: enum: - ga - beta - provisional properties: {} title: InstrumentRolloutStage type: string Currency: enum: - EUR - USD - GBP properties: {} title: Currency type: string InstrumentTradingStatus: enum: - buy_sell - buy_only - sell_only - not_trading properties: {} title: InstrumentTradingStatus type: string 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 ````