Computes mean NDVI and an ordinary least-squares daily NDVI trend, then applies yield = in
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.
3000 (raw units)
price
2
calls / 30d
2
unique payers
2026-09-17
updated
Provider
space.halowerk.com · discovered, not yet claimed by its owner
Payment (x402 accepts[])
[
{
"scheme": "exact",
"network": "eip155:8453",
"payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "3000",
"maxTimeoutSeconds": 300
}
]Output schema
{
"bazaar": {
"info": {
"input": {
"body": {
"observations": [
{
"day_after_planting": 30,
"ndvi": 0.38
},
{
"day_after_planting": 45,
"ndvi": 0.57
},
{
"day_after_planting": 60,
"ndvi": 0.68
},
{
"day_after_planting": 75,
"ndvi": 0.7
}
],
"yield_intercept": 1.2,
"yield_per_daily_ndvi_trend": 35,
"yield_per_mean_ndvi": 8.5,
"yield_unit": "tonnes_per_hectare"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"observations": {
"items": {
"additionalProperties": false,
"properties": {
"day_after_planting": {
"maximum": 10000,
"minimum": 0,
"type": "integer"
},
"ndvi": {
"maximum": 1,
"minimum": -1,
"type": "number"
}
},
"required": [
"day_after_planting",
"ndvi"
],
"type": "object"
},
"maxItems": 10000,
"minItems": 2,
"type": "array"
},
"yield_intercept": {
"maximum": 1000000000000,
"minimum": -1000000000000,
"type": "number"
},
"yield_per_daily_ndvi_trend": {
"maximum": 1000000000000000,
"minimum": -1000000000000000,
"type": "number"
},
"yield_per_mean_ndvi": {
"maximum": 1000000000000,
"minimum": -1000000000000,
"type": "number"
},
"yield_unit": {
"maxLength": 64,
"minLength": 1,
"type": "string"
}
},
"required": [
"observations",
"yield_intercept",
"yield_per_mean_ndvi",
"yield_per_daily_ndvi_trend",
"yield_unit"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
}Use it
curl
curl "https://space.halowerk.com/v1/crop-yield-ndvi" # -> 402 Payment Required, accepts[] lists how to pay # retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid
JavaScript
const res = await fetch("https://space.halowerk.com/v1/crop-yield-ndvi");
if (res.status === 402) {
const { accepts } = await res.json();
// pay one of accepts[] via an x402 client, then retry with the payment header
}Python
import httpx
res = httpx.get("https://space.halowerk.com/v1/crop-yield-ndvi")
if res.status_code == 402:
accepts = res.json()["accepts"]
# pay one of accepts[] via an x402 client, then retry with the payment headerMachine-readable
Everything on this page is also available as clean JSON at /resources/15200.json, and this resource appears in /discovery/resources and /discovery/search.