Wren Credits API

openapi: 3.2.0
info:
  title: Wren Credits API
  description: The Wren API is a JSON REST API that lets you offset carbon dioxide through Wren's portfolio of verified carbon sequestration projects. Create offset orders by tonnage, fund specific projects by dollar amount, plant trees, manage a prepaid credit balance, and list portfolios, purchases, and donations. Most endpoints require an API token (team live token, wren_test_ sandbox token, or legacy personal token) via HTTP Basic or Bearer auth.
  version: '2026-07-21'
  contact:
    name: Wren Support
    email: support@wren.co
    url: https://www.wren.co/faq
  termsOfService: https://www.wren.co/terms-of-use
servers:
- url: https://www.wren.co
  description: Production
security:
- basicAuth: []
- bearerAuth: []
tags:
- name: Credits
  description: Manage the prepaid credit balance
paths:
  /api/credits/top-up:
    post:
      operationId: topUpCredits
      tags:
      - Credits
      summary: Add credits to your balance
      description: Charges the payment method on file and adds the amount to the credit balance. Team tokens top up the team wallet; legacy personal tokens top up the user wallet.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - amountInUsdCents
              properties:
                amountInUsdCents:
                  type: integer
                  minimum: 100
                  description: Amount to add in USD cents. Minimum 100 ($1.00).
            examples:
              basic:
                value:
                  amountInUsdCents: 10000
      responses:
        '200':
          description: Credits added
          content:
            application/json:
              schema:
                type: object
                properties:
                  amountCharged:
                    type: integer
                    description: In the user currency's smallest denomination
                  id:
                    type: string
                    description: Stripe charge ID
                  creditBalance:
                    type: integer
                    description: Updated credit balance in USD cents
        '400':
          $ref: '#/components/responses/BadRequest'
        '403':
          $ref: '#/components/responses/Forbidden'
  /api/credits/balance:
    get:
      operationId: getCreditBalance
      tags:
      - Credits
      summary: Get your current credit balance
      description: Returns the authenticated team or user's current credit balance. Test tokens return a canned $1,000.00 balance.
      responses:
        '200':
          description: Current credit balance
          content:
            application/json:
              schema:
                type: object
                properties:
                  creditBalanceUsdCents:
                    type: integer
                    description: Current balance in USD cents (e.g. 10000 = $100.00).
        '403':
          $ref: '#/components/responses/Forbidden'
  /api/credits/ledger:
    get:
      operationId: listCreditLedger
      tags:
      - Credits
      summary: List your credit transactions
      description: Returns the credit transaction history, most recent first. Test tokens return a small canned sample ledger.
      parameters:
      - name: limit
        in: query
        schema:
          type: integer
          default: 50
          maximum: 200
        description: Number of entries to return.
      - name: offset
        in: query
        schema:
          type: integer
          default: 0
        description: Number of entries to skip.
      responses:
        '200':
          description: Credit ledger entries
          content:
            application/json:
              schema:
                type: object
                properties:
                  entries:
                    type: array
                    items:
                      $ref: '#/components/schemas/CreditLedgerEntry'
        '403':
          $ref: '#/components/responses/Forbidden'
components:
  schemas:
    CreditLedgerEntry:
      type: object
      properties:
        id:
          type: string
        amountUsdCents:
          type: integer
        createdAt:
          type: string
          format: date-time
        description:
          type: string
    Error:
      type: object
      properties:
        message:
          type: string
          description: Human-readable description of the validation or auth failure.
  responses:
    Forbidden:
      description: Missing or invalid authentication, or account not eligible for the operation.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    BadRequest:
      description: Invalid payload, missing required fields, or validation failure.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    basicAuth:
      type: http
      scheme: basic
      description: 'Recommended for curl: pass the API token as the username with an empty password (-u [api_token]:). Token types: team live token (UUID), team test token (wren_test_ prefix, sandbox), legacy personal token (UUID).'
    bearerAuth:
      type: http
      scheme: bearer
      description: 'Authorization: Bearer [api_token] with the same token types as Basic auth.'
externalDocs:
  description: Wren API Documentation
  url: https://www.wren.co/docs/api
x-provenance:
  generated: '2026-07-21'
  method: derived
  source:
  - https://www.wren.co/docs/api
  - https://www.wren.co/docs/api/wren-api.postman_collection.json
  - https://www.wren.co/docs/api/offset-orders
  - https://www.wren.co/docs/api/project-orders
  - https://www.wren.co/docs/api/tree-orders
  - https://www.wren.co/docs/api/portfolios
  - https://www.wren.co/docs/api/purchases
  - https://www.wren.co/docs/api/project-donations
  - https://www.wren.co/docs/api/credits
  note: Wren publishes complete REST reference documentation and a Postman collection but no OpenAPI document. This spec was derived faithfully from the published docs and collection by the API Evangelist enrichment pipeline; it is not an official Wren artifact.