Fertilizer Rate

{
  "area": 10,
  "asOf": "2026-10-11T23:40:36.542Z",
  "degraded": false,
  "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
  "elementalKSupplied": 0,
  "elementalPSupplied": 0,
  "k2oSupplied": 0,
  "nSupplied": 150,
  "notChecked": [
    "nutrient credits from soil, manure, previous crops and irrigation water",
    "ammonia loss, leaching and placement efficiency",
    "…2 more"
  ],
  "p2o5Supplied": 0,
  "productRatePerArea": 326.087,
  "productRateUnit": "lb/acre",
  "reasons": [
    "Product needed = target / 0.46 (the N fraction of the product).",
    "Other nutrients in the product come along at the same rate; see nSupplied, p2o5Supplied and k2oSupplied."
  ],
  "source": "computed locally (product = nutrient / analysis fraction)",
  "summary": "326.09 lb/acre of 46-0-0 supplies 150 lb/acre N; 3260.9 lb over 10 acre of field.",
  "targetNutrient": "n",
  "targetRate": 150,
  "totalProduct": 3260.8696,
  "totalProductUnit": "lb",
  "units": "imperial",
  "verdict": "RATE_COMPUTED"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://agri-calc.x402tookit.com/fertilizer-rate?analysis=46-0-0&area=10&nutrient=n&targetRate=150'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://agri-calc.x402tookit.com/fertilizer-rate?analysis=46-0-0&area=10&nutrient=n&targetRate=150' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagri-calc.x402tookit.com%2Ffertilizer-rate
const res = await pay("https://agri-calc.x402tookit.com/fertilizer-rate?analysis=46-0-0&area=10&nutrient=n&targetRate=150");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://agri-calc.x402tookit.com/fertilizer-rate?analysis=46-0-0&area=10&nutrient=n&targetRate=150")
    print(res.status_code, res.text)