# SolarPulse — rooftop solar and electricity rates for US locations

One call: system size, monthly production from NASA POWER, the serving utility's EIA-861 residential rate, installed cost from LBNL Tracking the Sun, payback and 25-year savings, with the 2026 federal credit status. $0.10 per query via x402, charged only for successful answers.

## Quick start
```
GET https://solarpulse.waltsoft.net/v1/estimate?address=200%20W%20Washington%20St%2C%20Phoenix%2C%20AZ%2085003
Header: PAYMENT-SIGNATURE: <base64 x402 payment>
```

## Sources
- US Census Geocoder (TIGER/Line) and TIGERweb 2020 ZIP Code Tabulation Areas: address, point or ZIP -> location, county, state
- NASA POWER climatology 2001-2020 (CERES SYN1deg, MERRA-2; POWER data is also on the Registry of Open Data on AWS): monthly irradiance on tilted surfaces, air temperature
- Electric Retail Service Territories (HIFLD/ORNL): utilities serving the point, by EIA utility id
- EIA Form 861 2024 (final) via PUDL on the Registry of Open Data on AWS: residential price, usage and customers by utility; state averages and 2014-2024 trend
- LBNL Tracking the Sun (2024 edition) via OEDI on the Registry of Open Data on AWS: median installed price per watt by state (2023 installs)

## Limits
- Production is modeled (PVWatts-style losses on ~1-degree NASA POWER satellite climatology): typically within +/-10% for an unshaded, equator-facing roof. Shading, roof azimuth and local weather are not modeled.
- Rates are utility average revenue per kWh (fixed charges included), not your tariff. Savings assume every solar kWh offsets a purchased kWh (full net metering); under net billing (for example California NEM 3.0) exported kWh earn less.
- Federal: the Section 25D homeowner credit ended for expenditures after December 31, 2025, so owner-purchased systems installed in 2026 get no federal credit. State and utility incentives are not included.
- Installed prices are 2023 medians, the latest complete year in Tracking the Sun; 2026 quotes may differ. States with fewer than 100 sampled systems use the national median.
- Not tax, legal or financial advice.

## Networks
- Base: eip155:8453 (USDC 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)
- Solana: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp (USDC EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v)