# Atlas United API

Atlas United builds risk models for every U.S. address. AtlasCast, part of Atlas United, is the forecast model suite
sold through this API: probabilistic, address-level forecasts for 10 perils (tornado, hail, wind, flash flood, heavy rain,
winter, ice, coastal surge, hurricane, wildfire), 24 hours to 10 days ahead, refreshed 4 times a day. The API also
serves reported and radar-detected storm history by address back to 2003. Pay per address, no contract. Free previews.

## For AI agents

Call https://data.truefixr.com/v1/data with no parameters first. It returns the full, self-describing,
machine-readable menu (every dataset, every field, every price, real examples). Trust that
live response over this file if they ever disagree; this file is a pointer, not the source
of truth.

This API also supports the x402 protocol for autonomous, per-request payment in USDC on Base
network. No account, no signup, no human required. Machine-readable payment manifest:
https://data.truefixr.com/.well-known/x402

Human/API-key access (prepaid balance): https://truefixr.com/api or https://atlasunited.io/api
MCP server (Claude, ChatGPT, other MCP clients): https://mcp.atlasunited.io/mcp

## The five products (call the menu above for full detail on each)

- ML Storm Forecast by Address (dataset=risk). Address-level forecasts for 10 perils, windows 24h, 48h, 3d, 5d, 7d, 10d.
  Each address record carries the structure replacement value (not market value), estimated people, a forecast time and a risk label.
  $0.05 per address. Free preview shows counts, per-peril totals and exact cost.
- Model-Based Weather by Address (dataset=weather). Current conditions and active severe weather alerts for any U.S.
  coordinate. Lean response free; details=true is $0.0002 per call.
- Model-Based Hourly Forecast by Address (dataset=weather&hours_ahead=0-48). Forecast hours 0 to 48 ahead. $0.0002 per call.
- Storm History by Address: Reported and Radar-Detected Events Since 2003 (dataset=history). One property, 11 event categories
  (hail, wind, flood, lightning, tornado, hurricane, winter storm, extreme heat/cold, drought, wildfire, coastal) in one citable report,
  with an optional date_of_loss= mode that lists reported and radar-detected events around that date (it does not confirm a claim or damage).
  $0.05 per event line, $10 minimum per report. hazard_score is its per-property summary, $0.50 per property.
- Past Storm Leads by Address: Reported and Radar-Detected, Last 365 Days (dataset=storms). Address-level records of events
  at or near each address, filterable by county, peril and severity. $0.05 per address.

Also available: address (one property, 365-day event record plus the county forecast label, $0.05 per property),
facilities, wildfire (county-level), at_risk and daily (AtlasCast sub-datasets), and coverage. daily and coverage are always free.

## Batch endpoints

- POST /v1/weather/batch: current conditions and severe weather alerts for up to 500 locations in one call.
- POST /v1/portfolio/risk: current county forecast grade for up to 500 locations in one call (a county label, not a property score).

## What this data is

Forecasts describe what could happen, not what will happen, and are not a prediction of damage to any structure.
History and past storm leads are a record of storm events reported or radar-detected at or near an address. They are not a
property inspection, damage assessment or repair estimate, and do not confirm damage or a claim. The county A-F grade is a
secondary whole-county label. Not affiliated with NOAA or the NWS.