Chemistry Spectrum Peak Comparison

{
  "data": {
    "chargedAmount": "10050",
    "inputHash": "sha256:30fbb88bf917898186ff69b92c103ae866e886aecabd482948cc79f5c…",
    "limitations": [
      "Public or synthetic inputs only. Caller labels are declarations,…"
    ],
    "productId": "chemistry-spectrum-peak-comparison",
    "result": {
      "findings": {
        "compoundIdentityEstablished": false,
        "matches": [
          {
            "delta": -0.2,
            "observedIndex": 0,
            "referenceIndex": 0
          }
        ],
        "method": "nearest-unused-reference within absolute tolerance; input-order …",
        "unit": "m/z",
        "unmatchedReferenceIndices": [
          1
        ]
      },
      "limitations": [
        "Public or synthetic research inputs only; no patient, personal g…"
      ],
      "methodVersion": "maha-science50/1.0.0",
      "numericPrecision": "IEEE754-double; finite outputs rounded to 12 significant digits"
    },
    "resultHash": "sha256:aba26fbe68a7c096fd3863c4ee191ecbeb1a47815cf5f277163bcd99e…",
    "sourceContractAmount": "49001",
    "version": "maha-legacy-adapter/1"
  },
  "proof": {
    "settlement_id": "0x00000000000000000000000000000000000000000000000000000000000000…"
  },
  "success": true
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://www.mahastrategies.com/api/v1/compute/chemistry/spectrum-peak-comparison' \
  -H 'content-type: application/json' \
  --data-raw '{"dataClass":"synthetic","observed":[100,200,300],"reference":[100.2,202,400],"tolerance":0.5,"unit":"m/z"}'

# 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 - -X POST 'https://www.mahastrategies.com/api/v1/compute/chemistry/spectrum-peak-comparison' \
  -H 'content-type: application/json' \
  --data-raw '{"dataClass":"synthetic","observed":[100,200,300],"reference":[100.2,202,400],"tolerance":0.5,"unit":"m/z"}' \
  | 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 $0.01005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01005" });
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 $0.01005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fwww.mahastrategies.com%2Fapi%2Fv1%2Fcompute%2Fchemistry%2Fspectrum-peak-comparison&method=POST
const res = await pay("https://www.mahastrategies.com/api/v1/compute/chemistry/spectrum-peak-comparison", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "dataClass": "synthetic",
    "observed": [
      100,
      200,
      300
    ],
    "reference": [
      100.2,
      202,
      400
    ],
    "tolerance": 0.5,
    "unit": "m/z"
  }),
});
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 $0.01005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01005"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://www.mahastrategies.com/api/v1/compute/chemistry/spectrum-peak-comparison",
        json={
            "dataClass": "synthetic",
            "observed": [
                100,
                200,
                300,
            ],
            "reference": [
                100.2,
                202,
                400,
            ],
            "tolerance": 0.5,
            "unit": "m/z",
        },
    )
    print(res.status_code, res.text)