Fertilizer Rate

{
  "analysis": "10-10-10",
  "areaSqFt": 2500,
  "asOf": "2026-10-11T20:20:02.734Z",
  "bagsNeeded": 1,
  "degraded": false,
  "deliveredPer1000SqFt": {
    "elementalKLb": 0.83,
    "elementalPLb": 0.436,
    "k2oLb": 1,
    "nLb": 1,
    "p2o5Lb": 1
  },
  "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
  "notChecked": [
    "your soil's actual needs: only a soil test shows what to add (phosphorus and potassium are often not needed on established lawns and gardens)",
    "slow-release versus quick-release products and the maximum safe single application on the label (fast nitrogen over about 1 pound N per 1000 sq ft can burn turf)",
    "…2 more"
  ],
  "nutrient": "nitrogen",
  "productKgPerHectare": 488.2,
  "productLbPer1000SqFt": 10,
  "productOzPer100SqFt": 16,
  "reasons": [
    "Product = target nutrient / (analysis % / 100). The analysis lists N, P2O5 and K2O (oxides), not elemental P and K.",
    "Elemental P = P2O5 x 0.4364; elemental K = K2O x 0.8301."
  ],
  "source": "computed locally",
  "summary": "To apply 1 lb of nitrogen per 1000 sq ft with 10-10-10, spread 10 lb of product per 1000 sq ft: 25 lb (0.5 bags of 50 lb) over 2500 sq ft. That delivers 1 lb N, 1 lb P2O5 and 1 lb K2O per 1000 sq ft.",
  "targetKgPerHectare": 48.8,
  "targetLbPer1000SqFt": 1,
  "totalDelivered": {
    "k2oLb": 2.5,
    "nLb": 2.5,
    "p2o5Lb": 2.5
  },
  "totalProductKg": 11.34,
  "totalProductLb": 25,
  "verdict": "COMPUTED"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://garden-calc.x402tookit.com/fertilizer-rate?analysis=10-10-10&areaSqFt=2500&bagLb=50&nutrient=n&targetLbPer1000SqFt=1'

# 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://garden-calc.x402tookit.com/fertilizer-rate?analysis=10-10-10&areaSqFt=2500&bagLb=50&nutrient=n&targetLbPer1000SqFt=1' \
  | 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%2Fgarden-calc.x402tookit.com%2Ffertilizer-rate
const res = await pay("https://garden-calc.x402tookit.com/fertilizer-rate?analysis=10-10-10&areaSqFt=2500&bagLb=50&nutrient=n&targetLbPer1000SqFt=1");
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://garden-calc.x402tookit.com/fertilizer-rate?analysis=10-10-10&areaSqFt=2500&bagLb=50&nutrient=n&targetLbPer1000SqFt=1")
    print(res.status_code, res.text)