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HCAD Parcel Value History
x402
HCAD Parcel Value History is a paid API for AI agents from hcad-api.canvas-cart.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
Returns every tax year's assessed, appraised, and market values for a single Harris County (Texas) parcel by HCAD account number.
Price / call$0.02
Success—
StatusUnknown
How this service works
Every tax year's assessed, appraised, and market value for one Harris County parcel. Get the acct from GET /search?addr=<street>. Raw HCAD roll values, verbatim, no interpretation.
Output
A list of records — one per tax year — each containing the assessed value, appraised value, and market value for the specified Harris County parcel, sourced verbatim from the HCAD appraisal roll with no interpretation or transformation.
Example use cases
Track home value appreciation over time
“Can you show me how the appraised and market value has changed year by year for my Houston property? The HCAD account number is 1234560000012.”
Property tax protest preparation
“I'm getting ready to protest my property tax assessment — can you pull the full HCAD valuation history for account 0520070020024 so I can see how this year's assessed value compares to prior years?”
Real estate due diligence before purchase
“Before I make an offer on this Harris County property, can you get me the complete HCAD appraisal and assessed value history for account number 0741230000018?”
Technical details
Endpoint
GEThttps://hcad-api.canvas-cart.workers.dev/parcel/:acct/historyWhen to prefer
Use this endpoint when you need the complete multi-year valuation history (assessed, appraised, market) for a single Harris County parcel and already have the HCAD account number. It is ideal for year-over-year comparison, tax protest research, and real estate due diligence. Use the companion /search endpoint first if you only have a street address. Prefer this over general real estate APIs when you specifically need raw, authoritative HCAD roll values.
Side effects
- Invalid or non-existent HCAD account number returns an error or empty result
- Account number not in 13-digit format may cause a validation error
- Parcel with no history in HCAD system returns empty array
- Network or worker timeout if HCAD upstream is slow
- Payment failure (x402) if USDC balance is insufficient
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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