Changelog

All changes to the ModernFi API are documented here in reverse chronological order. Each entry includes new and updated endpoints, schema changes, deprecations, and removals. Breaking changes are flagged as such and include migration guidance. We recommend reviewing this page closely before beginning development or upgrading to a new API version.
January 9, 2026

v1.5.2

Happy New Year from the ModernFi team! See below for our latest API changes.

This release introduces Pricing Groups — a new resource for managing interest rates at scale across your accounts. Instead of updating rates on individual accounts one at a time, you can now define reusable rate tier structures and assign them to multiple accounts. When a group’s rates change, all assigned accounts are updated automatically.

New Endpoints

  • GET /v1/pricing-groups — List all pricing groups for your institution, including account counts and current rate tiers.
  • POST /v1/pricing-groups — Create a new pricing group with rate tiers. Optionally assign accounts at creation time.
  • GET /v1/pricing-groups/{pricing_group_id} — Retrieve details for a specific pricing group.
  • PATCH /v1/pricing-groups/{pricing_group_id} — Update pricing group name and description. Does not affect rates or account assignments.
  • DELETE /v1/pricing-groups/{pricing_group_id} — Delete a pricing group. Fails if accounts are still assigned — unassign them first.
  • PUT /v1/pricing-groups/{pricing_group_id}/rates — Replace rate tiers for a pricing group. New rates cascade to all assigned accounts on the specified effective date, while preserving historical rate data.
  • POST /v1/pricing-groups/{pricing_group_id}/accounts — Assign accounts to a pricing group. Accounts already in another group will be reassigned.
  • DELETE /v1/pricing-groups/{pricing_group_id}/accounts — Unassign accounts from a pricing group. They retain their current rates but no longer receive automatic updates when the group’s rates change.

Updated Endpoints

  • POST /v1/accounts (Create Account)
    • Added pricing_group_id (uuid, optional) — assign the account to a pricing group at creation. The group’s rate structure will be applied automatically.

Schema Changes

  • AccountResponse

    • Added pricing_group_id (string, nullable) — the pricing group this account belongs to, if any

  • New schemas: PricingGroupResponse, PricingGroupRateTierRequest, PricingGroupRateTierResponse, CreatePricingGroupRequest, UpdatePricingGroupMetadataRequest, UpdatePricingGroupRatesRequest, AssignAccountsToPricingGroupRequest, UnassignAccountsRequest, AccountData