Developer Platform

Build on wealth data that's already clean.

Stop normalizing custodian data before you can use it. Milemarker's API delivers clean, joined, wealth-management-native data to your advisor tools, client portals, and analytics applications.

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REST API · 130+ sources normalized · SOC 2 Type II

The Real Cost

Building on raw custodian APIs takes months before you can start.

You want to build an advisor dashboard, a client portal, or an AI-powered tool. But before you write a single line of product code, you have to normalize data from five custodians, join it with CRM records, and figure out what a "household" means in each system.

Milemarker's API gives you a head start. Clean, normalized, wealth-management-native data from day one — positions, performance, accounts, households, transactions, and fees — all joinable with a single query.

How It Works

From credentials to product in three steps

1

Authenticate with Milemarker

Standard OAuth 2.0 authentication. Scoped by data domain so your application only sees what it needs.

2

Query normalized wealth data

REST endpoints for accounts, households, positions, transactions, performance, advisors, and fees — all using consistent field names regardless of the underlying custodian.

3

Build your application

Your team focuses on the product experience. Milemarker handles the normalization, the custodian connections, and the daily data refresh.

What the API Delivers

Every endpoint your application needs. Already normalized.

Consistent field names, consistent structures, consistent behavior — regardless of which custodians your firm uses.

Positions endpoint

Query current positions across all custodians for any account or household. Same field names whether assets are at Schwab or Fidelity.

Performance endpoint

Time-weighted and money-weighted returns, benchmark comparisons, sub-period performance — computed from normalized transaction data. No building your own calculation engine.

Household hierarchy

Query households with all accounts, advisors, and relationships already linked. No joining across tables to understand who belongs to what.

Transaction history

Buys, sells, dividends, transfers, fees — normalized across custodians with consistent transaction type classification.

Webhooks for real-time events

Subscribe to business events — new accounts, significant trades, compliance flags — and get notified the moment they happen in normalized form.

Sandbox environment

Test against a realistic sandbox populated with normalized sample data. Build before connecting to live firm data.

130+
Sources Normalized
<100ms
Median API Latency
REST + GraphQL
Query Options
Who It's For

Built for the teams building the product

Engineering Lead

"We spent 6 months building custodian integrations before we could start on the actual product. Milemarker's API gives us the normalized data layer we were building — on day one."

Head of Product

"Our roadmap was stuck behind data infrastructure. Milemarker unlocked it. Our engineers moved from cleaning data to building features."

Common Questions

What developers ask before they build

Does Milemarker offer a REST API?
Yes. Standard REST endpoints for all major data domains — accounts, households, positions, performance, transactions, advisors, and fees.
What authentication does the API use?
OAuth 2.0 with scoped access. Your application is credentialed for the specific data domains it needs — nothing more.
Can I use the API to write data back to custodians?
Milemarker's API is read-focused. For write-back workflows (CRM updates, order placement), we use Milemarker Relay, our automation layer.
What's the rate limit?
Rate limits scale with your plan. Most advisor-facing applications operate well within standard tier limits — we scope this during onboarding.
Related Resources
Data Platform Wealth Management Data Warehouse: Purpose-Built for Investment Firms Data Warehouse Snowflake for Wealth Management: Native Integration with Milemarker Data Engineering ETL for Wealth Management: Stop Building Pipelines from Scratch Data Model Unified Data Model for Wealth Management: One Schema for Every Source

Stop building data infrastructure. Start building your product.

Milemarker's API gives your engineering team clean, normalized wealth management data from day one. See what they can build when the data layer is already done.

130+ sources normalized · REST + GraphQL · SOC 2 Type II