Bullion API

Bullion API API

Bullion API API as documented publicly: 10 operations. Contract generated from the documentation by API Evangelist (2026-10-14); not the provider's own document.

Documentation GitHub OpenAPI

Operations 10

GET /v1/central-bank-gold/de GET /v1/central-bank-gold/de #

GET /v1/central-bank-reserves/gb GET /v1/central-bank-reserves/gb #

GET /v1/countries/uk GET /v1/countries/uk #

GET /v1/gold/{goldid} GET /v1/gold/carat #

DELETE /v1/portfolio/transactions/11111111-1111-4111-8111-111111111111 DELETE /v1/portfolio/transactions/11111111-1111-4111-8111-111111111111 #

GET /v1/portfolio/{portfolioid} GET /v1/portfolio/gains #

GET /v1/silver/consumption GET /v1/silver/consumption #

GET /v1/{metal}/{id} Returns one metal's absolute and percentage change between the final cached observation of two UTC days #

GET /v1/{v1id} GET /v1/bond-yields returns the latest government bond yields for every covered country. #

GET /v1/{v1id}/{country} GET /v1/bond-yields/{country} returns government bond yields for one country. #

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OpenAPI Specification

openapi: 3.1.0
info:
  title: Bullion API API
  version: '2026-10-14'
  description: 'GENERATED FROM DOCUMENTATION by API Evangelist on 2026-10-14: 10 operation(s) read from 1 public documentation page(s) (each operation
    names its page in x-source). This is not the provider''s published contract; Bullion API has published no machine-readable contract that the
    pipeline could find. Engine: local.'
  x-evidence-tiers:
    code-example: 22
    documentation: -12
    pages-with-code: 1
    pages-read: 1
  x-generated-from: documentation
  x-provenance: generated
  x-authored-by: API Evangelist
  x-generated: '2026-10-14'
  x-generator: generate-contract-from-docs.py
  x-engine: local
  x-sources:
  - https://bullionapi.dev/docs.md
servers:
- url: https://api.bullionapi.dev
paths:
  /v1/central-bank-gold/de:
    get:
      operationId: get_v1_central_bank_gold_de
      tags:
      - Central Bank Gold
      summary: GET /v1/central-bank-gold/de
      x-source: https://bullionapi.dev/docs.md
      parameters:
      - name: end
        in: query
        required: false
        schema:
          type: string
      - name: start
        in: query
        required: false
        schema:
          type: string
      responses:
        '200':
          description: Success (shape read from the example response on the page)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/GetV1CentralBankGoldDeResponse'
      x-evidence:
        kind: code-example
        language: curl
        snippet: 'curl -H "X-API-Key: bullion_your_key"  "https://api.bullionapi.dev/v1/central-bank-gold/de?start=2026-01-01&end=2026-06-30"'
  /v1/central-bank-reserves/gb:
    get:
      operationId: get_v1_central_bank_reserves_gb
      tags:
      - Central Bank Reserves
      summary: GET /v1/central-bank-reserves/gb
      x-source: https://bullionapi.dev/docs.md
      parameters:
      - name: end
        in: query
        required: false
        schema:
          type: string
      - name: start
        in: query
        required: false
        schema:
          type: string
      responses:
        '200':
          description: Success (shape read from the example response on the page)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/GetV1CentralBankReservesGbResponse'
      x-evidence:
        kind: code-example
        language: curl
        snippet: 'curl -H "X-API-Key: bullion_your_key"  "https://api.bullionapi.dev/v1/central-bank-reserves/gb?start=2024-01-01&end=2025-12-31"

          ```'
  /v1/countries/uk:
    get:
      operationId: get_v1_countries_uk
      tags:
      - Countries
      summary: GET /v1/countries/uk
      x-source: https://bullionapi.dev/docs.md
      responses:
        '200':
          description: Success (shape read from the example response on the page)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/GetV1CountriesUkResponse'
      x-evidence:
        kind: code-example
        language: curl
        snippet: 'curl -H "X-API-Key: bullion_your_key" "https://api.bullionapi.dev/v1/countries/uk"

          ```'
  /v1/gold/{goldid}:
    get:
      operationId: get_v1_gold_goldid
      tags:
      - Gold
      summary: GET /v1/gold/carat
      x-source: https://bullionapi.dev/docs.md
      parameters:
      - name: goldid
        in: path
        required: true
        schema:
          type: string
      - name: currency
        in: query
        required: false
        schema:
          type: string
      responses:
        '200':
          description: Success (shape read from the example response on the page)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/GetV1GoldGoldidResponse'
      x-evidence:
        kind: code-example
        language: curl
        snippet: 'curl -H "X-API-Key: bullion_your_key"  "https://api.bullionapi.dev/v1/gold/carat?currency=USD"

          ```'
        collapsed_from: 7 example path(s) differing only at goldId
  /v1/portfolio/transactions/11111111-1111-4111-8111-111111111111:
    delete:
      operationId: delete_v1_portfolio_transactions_11111111_1111_4111_8111_111111111111
      tags:
      - Portfolio
      summary: DELETE /v1/portfolio/transactions/11111111-1111-4111-8111-111111111111
      x-source: https://bullionapi.dev/docs.md
      responses:
        '200':
          description: Success (status as documented)
      x-evidence:
        kind: code-example
        language: curl
        snippet: 'curl -X DELETE "https://api.bullionapi.dev/v1/portfolio/transactions/11111111-1111-4111-8111-111111111111"  -H "X-API-Key: bullion_your_key"  -H
          ''If-Match: "1"''

          ```'
  /v1/portfolio/{portfolioid}:
    get:
      operationId: get_v1_portfolio_portfolioid
      tags:
      - Portfolio
      summary: GET /v1/portfolio/gains
      x-source: https://bullionapi.dev/docs.md
      parameters:
      - name: portfolioid
        in: path
        required: true
        schema:
          type: string
      - name: uk_tax_year
        in: query
        required: false
        schema:
          type: string
      responses:
        '200':
          description: Success (status as documented)
      x-evidence:
        kind: code-example
        language: curl
        snippet: 'curl -H "X-API-Key: bullion_your_key"  "https://api.bullionapi.dev/v1/portfolio/gains?uk_tax_year=2025-26"

          ```'
        collapsed_from: 3 example path(s) differing only at portfolioId
  /v1/silver/consumption:
    get:
      operationId: get_v1_silver_consumption
      tags:
      - Silver
      summary: GET /v1/silver/consumption
      x-source: https://bullionapi.dev/docs.md
      parameters:
      - name: end
        in: query
        required: false
        schema:
          type: string
      - name: start
        in: query
        required: false
        schema:
          type: string
      responses:
        '200':
          description: Success (shape read from the example response on the page)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/GetV1SilverConsumptionResponse'
      x-evidence:
        kind: code-example
        language: curl
        snippet: 'curl -H "X-API-Key: bullion_your_key"  "https://api.bullionapi.dev/v1/silver/consumption?start=2012-01-01&end=2021-12-31"

          ```'
  /v1/{metal}/{id}:
    get:
      operationId: get_v1_metal_id
      tags:
      - Api
      summary: Returns one metal's absolute and percentage change between the final cached observation of two UTC days
      x-source: https://bullionapi.dev/docs.md
      parameters:
      - name: metal
        in: path
        required: true
        schema:
          type: string
      - name: id
        in: path
        required: true
        schema:
          type: string
      - name: currency
        in: query
        required: false
        schema:
          type: string
        description: ISO 4217 base currency. Defaults to USD.
      - name: unit
        in: query
        required: false
        schema:
          type: string
        description: 'Optional output mass unit: gram/g, kilogram/kg, or troy_oz/toz. Defaults to troy_oz.'
      - name: start
        in: query
        required: false
        schema:
          type: string
        description: First UTC day to compare (YYYY-MM-DD).
      - name: end
        in: query
        required: false
        schema:
          type: string
        description: Last UTC day to compare. Requires start.
      - name: period
        in: query
        required: false
        schema:
          type: string
        description: 'Rolling UTC window ending today: 1d, 1w, 1m, or 1y.'
      - name: api_key
        in: query
        required: false
        schema:
          type: string
        description: Fallback credential for clients that cannot set the X-API-Key header.
      responses:
        '200':
          description: Success (status as documented)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/GetV1MetalIdResponse'
      x-evidence:
        kind: documentation
        collapsed_from: 2 example path(s) differing only at id
  /v1/{v1id}:
    get:
      operationId: get_v1_v1id
      tags:
      - Api
      summary: GET /v1/bond-yields returns the latest government bond yields for every covered country.
      x-source: https://bullionapi.dev/docs.md
      parameters:
      - name: v1id
        in: path
        required: true
        schema:
          type: string
      - name: api_key
        in: query
        required: false
        schema:
          type: string
        description: Fallback credential for clients that cannot set the X-API-Key header.
      - name: currency
        in: query
        required: false
        schema:
          type: string
      responses:
        '200':
          description: Success (shape read from the example response on the page)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/GetV1V1IdResponse'
      x-evidence:
        kind: documentation
        collapsed_from: 10 example path(s) differing only at v1Id
  /v1/{v1id}/{country}:
    get:
      operationId: get_v1_v1id_country
      tags:
      - Api
      summary: GET /v1/bond-yields/{country} returns government bond yields for one country.
      x-source: https://bullionapi.dev/docs.md
      parameters:
      - name: v1id
        in: path
        required: true
        schema:
          type: string
      - name: country
        in: path
        required: true
        schema:
          type: string
      - name: tenor
        in: query
        required: false
        schema:
          type: string
        description: 'Filter: 2y|5y|10y|30y.'
      - name: basis
        in: query
        required: false
        schema:
          type: string
        description: 'Filter: nominal|real.'
      - name: api_key
        in: query
        required: false
        schema:
          type: string
        description: Fallback credential for clients that cannot set the X-API-Key header.
      responses:
        '200':
          description: Success (status as documented)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/GetV1V1IdCountryResponse'
      x-evidence:
        kind: documentation
        collapsed_from: 8 example path(s) differing only at v1Id
components:
  schemas:
    GetV1CentralBankGoldDeResponse:
      type: object
      properties:
        status:
          type: string
        portfolio:
          type: object
          properties:
            id:
              type: string
            metals:
              type: array
              items:
                type: string
            reporting_currency:
              type: string
            created_at:
              type: string
              format: date-time
            updated_at:
              type: string
              format: date-time
        summary:
          type: object
          properties:
            gold_quantity_grams:
              type: string
            metals:
              type: array
              items: {}
            cost_basis:
              type: string
            realised_pnl:
              type: string
            valuation:
              type: object
              properties:
                status:
                  type: string
                spot_price:
                  type:
                  - string
                  - 'null'
                current_value:
                  type:
                  - string
                  - 'null'
                unrealised_pnl:
                  type:
                  - string
                  - 'null'
                price_timestamp:
                  type:
                  - string
                  - 'null'
    GetV1CentralBankReservesGbResponse:
      type: object
      properties:
        status:
          type: string
        metric:
          type: string
        country:
          type: string
        country_name:
          type: string
        start:
          type: string
          format: date
        end:
          type: string
          format: date
        series:
          type: array
          items:
            type: object
            properties:
              id:
                type: string
              label:
                type: string
              unit:
                type: string
              frequency:
                type: string
              method:
                type: string
              observations:
                type: array
                items:
                  type: object
                  properties:
                    date:
                      type: string
                      format: date
                    value:
                      type: string
    GetV1CountriesUkResponse:
      type: object
      properties:
        status:
          type: string
        country:
          type: string
        country_name:
          type: string
        aliases:
          type: array
          items:
            type: string
        datasets:
          type: array
          items:
            type: object
            properties:
              metric:
                type: string
              path:
                type: string
    GetV1GoldGoldidResponse:
      type: object
      properties:
        status:
          type: string
        currency:
          type: string
        unit:
          type: string
        as_of:
          type: string
          format: date-time
        karats:
          type: object
          properties:
            24k:
              type: string
            23k:
              type: string
            22k:
              type: string
            21.6k:
              type: string
            21k:
              type: string
            18k:
              type: string
            16k:
              type: string
            14k:
              type: string
            12k:
              type: string
            10k:
              type: string
            9k:
              type: string
            8k:
              type: string
            6k:
              type: string
    GetV1SilverConsumptionResponse:
      type: object
      properties:
        status:
          type: string
        metric:
          type: string
        metal:
          type: string
        start:
          type:
          - string
          - 'null'
        end:
          type:
          - string
          - 'null'
        series:
          type: array
          items:
            type: object
            properties:
              id:
                type: string
              label:
                type: string
              unit:
                type: string
              frequency:
                type: string
              method:
                type: string
              geography:
                type: string
              category:
                type: string
              definition:
                type: string
              collected_at:
                type: string
                format: date-time
              freshness:
                type: string
              source:
                type: object
                properties:
                  attribution:
                    type: string
                  notice:
                    type: string
              observations:
                type: array
                items:
                  type: object
                  properties:
                    date:
                      type: string
                      format: date
                    value:
                      type: string
                    period_start:
                      type: string
                      format: date
    GetV1MetalIdResponse:
      type: object
      properties:
        status:
          type: string
        metric:
          type: string
        metal:
          type: string
        currency:
          type: string
        unit:
          type: string
        start:
          type: object
        end:
          type: object
        change:
          type: string
        change_percent:
          type: string
    GetV1V1IdResponse:
      type: object
      properties:
        status:
          type: string
        portfolio:
          type: object
          properties:
            id:
              type: string
            metals:
              type: array
              items:
                type: string
            reporting_currency:
              type: string
            created_at:
              type: string
              format: date-time
            updated_at:
              type: string
              format: date-time
        summary:
          type: object
          properties:
            gold_quantity_grams:
              type: string
            metals:
              type: array
              items: {}
            cost_basis:
              type: string
            realised_pnl:
              type: string
            valuation:
              type: object
              properties:
                status:
                  type: string
                spot_price:
                  type:
                  - string
                  - 'null'
                current_value:
                  type:
                  - string
                  - 'null'
                unrealised_pnl:
                  type:
                  - string
                  - 'null'
                price_timestamp:
                  type:
                  - string
                  - 'null'
    GetV1V1IdCountryResponse:
      type: object
      properties:
        status:
          type: string
        metric:
          type: string
        country:
          type: string
        series:
          type: array
  securitySchemes:
    apiKey:
      type: apiKey
      in: header
      name: X-API-Key
security:
- apiKey: []
tags:
- name: Api
- name: Central Bank Gold
- name: Central Bank Reserves
- name: Countries
- name: Gold
- name: Portfolio
- name: Silver