---
title: "Three-Fund Portfolio Builder · pf-134"
method: POST
path: "/v1/tools/three_fund_portfolio_builder"
---

# Three-Fund Portfolio Builder · pf-134

`POST /v1/tools/three_fund_portfolio_builder`

## Request

- Base URL: `https://ainumbers.co`
- URL: `https://ainumbers.co/v1/tools/three_fund_portfolio_builder`
- Auth: none declared

Build a three-fund lazy portfolio with Vanguard, Fidelity, or Schwab funds. Risk-based presets, custom allocation sliders, 40-year projection, expense ratio impact, and rebalancing guide. Client-side. Works offline. Zero PII.

**Tool URL:** https://ainumbers.co/tools/pf-134-three-fund-portfolio-builder.html
**AP2/Policy Mandate export:** yes

## Request body

- object

## Response `200`

Successful tool execution result

- object
  - `projectedBalance` number
  - `allocationSplit` object
  - `annualDrift` number
  - `mandateJson` object

---

[API](https://skmtc.dev/ainumbers/apis/ainumbers-co-fintech-intelligence-suite.md) · [All operations](https://skmtc.dev/ainumbers/apis/ainumbers-co-fintech-intelligence-suite/llms.txt) · [OpenAPI document](https://skmtc.dev/ainumbers/apis/ainumbers-co-fintech-intelligence-suite/revisions/b462e4f5bb28?raw)