Mono Investment API

openapi: 3.0.3
info:
  title: Mono Connect Investment API
  description: 'A grounded subset of the Mono open banking API for Africa. Mono lets businesses link customer bank accounts and read financial data, assess creditworthiness, collect direct bank payments (DirectPay), and verify identity (Lookup). Server-to-server requests authenticate with a secret key sent in the `mono-sec-key` header. Account linking is completed by the customer through the hosted Mono Connect widget; the widget returns a short-lived authorization code that is exchanged for a permanent account id used on all financial-data calls.


    Endpoint paths and methods here are grounded in the public Mono documentation at docs.mono.co (base host `https://api.withmono.com`, most endpoints under `/v2`; the account-number and Mashup Lookup endpoints are under `/v3`). Request and response bodies are modeled representatively - treat field-level schemas as illustrative and confirm exact payloads against the live reference before relying on them.'
  version: '2.0'
  contact:
    name: Mono
    url: https://mono.co
  x-provenance: Endpoint paths/methods grounded in docs.mono.co (2026-07-12). Request/response schemas are modeled and should be reconciled against the live API reference.
servers:
- url: https://api.withmono.com
  description: Mono production API host
security:
- monoSecKey: []
tags:
- name: Investment
  description: Investment holdings for a linked account.
paths:
  /v2/accounts/{id}/assets:
    parameters:
    - $ref: '#/components/parameters/AccountId'
    get:
      operationId: getAssets
      tags:
      - Investment
      summary: Assets
      description: Retrieves investment assets/holdings for a linked account.
      responses:
        '200':
          description: Investment assets.
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/Asset'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v2/accounts/{id}/earnings:
    parameters:
    - $ref: '#/components/parameters/AccountId'
    get:
      operationId: getEarnings
      tags:
      - Investment
      summary: Earnings
      description: Retrieves investment earnings/returns for a linked account.
      responses:
        '200':
          description: Investment earnings.
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: array
                    items:
                      type: object
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  schemas:
    Asset:
      type: object
      properties:
        name:
          type: string
        type:
          type: string
        cost:
          type: number
        return:
          type: number
        quantity:
          type: number
        currency:
          type: string
    Error:
      type: object
      properties:
        status:
          type: string
        message:
          type: string
  parameters:
    AccountId:
      name: id
      in: path
      required: true
      description: The permanent account id returned by the exchange-token endpoint.
      schema:
        type: string
  responses:
    Unauthorized:
      description: The `mono-sec-key` is missing or invalid.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    monoSecKey:
      type: apiKey
      in: header
      name: mono-sec-key
      description: Secret key for the application, found in the Mono dashboard. Sent on every server-to-server request in the `mono-sec-key` header. Use test keys in the sandbox and live keys in production.