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Halowerk Crop Yield NDVI Estimator
x402
Halowerk Crop Yield NDVI Estimator is a paid API for AI agents from space.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).
Estimates crop yield by computing mean NDVI and an OLS daily NDVI trend from time-series observations, then applying a caller-supplied linear model (intercept + mean_coefficient×mean_NDVI + trend_coefficient×daily_trend).
Price / call$0.003
Success—
StatusUnknown
How this service works
Computes mean NDVI and an ordinary least-squares daily NDVI trend, then applies yield = intercept + mean_coefficient×mean_NDVI + trend_coefficient×daily_trend. It does not derive NDVI from imagery, account for crop stage or weather, or provide an agronomically calibrated forecast unless the caller supplies valid coefficients.
Output
Returns the computed mean NDVI across all observations, the OLS-fitted daily NDVI trend slope, and the estimated yield value (intercept + mean_coefficient×mean_NDVI + trend_coefficient×daily_trend) expressed in the caller-specified yield unit. Does not derive NDVI from imagery or apply agronomic calibration beyond the supplied coefficients.
Example use cases
Seasonal maize yield forecast
“I have weekly NDVI readings for a maize field over 140 days after planting. Can you estimate the yield in kg/ha using an intercept of 800, a mean NDVI coefficient of 6200, and a daily trend coefficient of 40000? Here are the readings: day 7: 0.28, day 14: 0.38, day 21: 0.52, day 28: 0.63, day 35: 0.71, day 42: 0.75, day 49: 0.72, day 56: 0.68, day 63: 0.60, day 70: 0.49, day 77: 0.39, day 84: 0.30, day 91: 0.24, day 98: 0.19, day 105: 0.15, day 112: 0.12, day 119: 0.10, day 126: 0.09, day 133: 0.08, day 140: 0.07.”
Early-season yield potential screening
“I want to check early yield potential using NDVI values at day 20: 0.41, day 40: 0.58, and day 60: 0.67. Use yield unit 'bushels/acre', intercept 45.0, mean NDVI coefficient 120.0, and daily trend coefficient 800.”
Comparing two field zones
“Compare yield estimates for two field zones: zone A has NDVI at day 0: 0.3, day 45: 0.65, day 90: 0.55; zone B has day 0: 0.25, day 45: 0.58, day 90: 0.50. For both, use yield unit 't/ha', intercept 2.0, mean NDVI coefficient 9.0, and daily trend coefficient 200. Which zone should we prioritize?”
Technical details
Endpoint
POSThttps://space.halowerk.com/v1/crop-yield-ndviWhen to prefer
Choose this endpoint when you already have a pre-validated linear yield model (intercept and coefficients) and a time-series of NDVI values per day after planting, and you need a fast, deterministic yield estimate without invoking a full remote-sensing pipeline. It is ideal for lightweight agronomic dashboards, automated field monitoring agents, or batch yield screening across multiple fields where NDVI data is already available from a separate source.
Side effects
- Fewer than 2 observations provided — validation error
- NDVI values outside [-1, 1] range — schema validation failure
- Missing required coefficients yields mathematically undefined output
- Invalid or missing yield_unit string causes schema rejection
- Poorly calibrated coefficients produce agronomically meaningless estimates with no warning
- Collinear or flat NDVI time series may produce degenerate OLS trend slopes
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| yield_unit | string | |
| observations | array | |
| yield_intercept | number | |
| yield_per_mean_ndvi | number | |
| yield_per_daily_ndvi_trend | number |
Tags
x402
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