Pacing Analysis

{
  "activity": {
    "baseline": {
      "insufficientData": true,
      "mad": null,
      "median": null,
      "missingCount": 0,
      "n": 0,
      "windowDays": 14
    },
    "deviation": {
      "deviation": null,
      "mad": null,
      "median": null,
      "rawDelta": null,
      "status": "insufficient-baseline"
    },
    "today": null
  },
  "hrv": {
    "baseline": {
      "insufficientData": false,
      "mad": 3.4,
      "median": 42.1,
      "missingCount": 1,
      "n": 13,
      "windowDays": 14
    },
    "deviation": {
      "deviation": -4.3,
      "mad": 3.4,
      "median": 42.1,
      "rawDelta": -10.9,
      "status": "ok"
    },
    "today": {
      "status": "observed",
      "timestamp": "2026-08-30T07:00:00Z",
      "value": 31.2
    }
  },
  "note": "Descriptive statistics and labeled heuristic flags only. No diagnosis, prediction, or confirmation of post-exertional malaise is made or implied.",
  "observationCount": 15,
  "restingHeartRate": {
    "latestValue": 58,
    "thresholdEstimate": {
      "ceilingBpm": 73,
      "evidenceStatus": "Workwell Foundation clinical rule of thumb; no validating primary study found (targeted PubMed search, 2026-09-01). Present as an informal heuristic, never as a validated instrument.",
      "formula": "resting heart rate + 15 bpm",
      "restingHr": 58
    }
  },
  "risk": {
    "dataQuality": {
      "activity": "insufficient-baseline",
      "hrv": "ok",
      "sleep": "insufficient-baseline"
    },
    "flags": [
      {
        "code": "HRV_SUPPRESSED_VS_OWN_BASELINE",
        "evidenceStatus": "Directionally consistent with Aboagye et al. 2025 (single post-COVID cohort, n=68, not externally validated) and Ruijgt et al. 2026 (observational, no validated threshold). Not a diagnostic or predictive claim.",
        "message": "Today's HRV (RMSSD) deviates notably below this person's own rolling baseline."
      }
    ],
    "note": "Descriptive deviation-from-own-baseline flags only. No output of this function diagnoses, predicts, or confirms post-exertional malaise."
  },
  "sleep": {
    "baseline": {
      "insufficientData": true,
      "mad": null,
      "median": null,
      "missingCount": 0,
      "n": 0,
      "windowDays": 14
    },
    "deviation": {
      "deviation": null,
      "mad": null,
      "median": null,
      "rawDelta": null,
      "status": "insufficient-baseline"
    },
    "today": null
  },
  "usableObservationCount": 15,
  "windowDays": 14
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://market.561.group/v1/pacing/analysis' \
  -H 'content-type: application/json' \
  --data-raw '{"observations":[{"measuredAt":"2026-08-30T07:00:00Z","measurement":{"precision":"1","unit":"ms","value":"42.1"},"metric":"hrv-rmssd","missingness":{"status":"observed"},"recordType":"nutrition-biometric-observation","schemaVersion":"1.0.0"}],"windowDays":14}'

# 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://market.561.group/v1/pacing/analysis' \
  -H 'content-type: application/json' \
  --data-raw '{"observations":[{"measuredAt":"2026-08-30T07:00:00Z","measurement":{"precision":"1","unit":"ms","value":"42.1"},"metric":"hrv-rmssd","missingness":{"status":"observed"},"recordType":"nutrition-biometric-observation","schemaVersion":"1.0.0"}],"windowDays":14}' \
  | 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 $0.05 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.05" });
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 $0.05 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fmarket.561.group%2Fv1%2Fpacing%2Fanalysis&method=POST
const res = await pay("https://market.561.group/v1/pacing/analysis", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "observations": [
      {
        "measuredAt": "2026-08-30T07:00:00Z",
        "measurement": {
          "precision": "1",
          "unit": "ms",
          "value": "42.1"
        },
        "metric": "hrv-rmssd",
        "missingness": {
          "status": "observed"
        },
        "recordType": "nutrition-biometric-observation",
        "schemaVersion": "1.0.0"
      }
    ],
    "windowDays": 14
  }),
});
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 $0.05 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.05"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://market.561.group/v1/pacing/analysis",
        json={
            "observations": [
                {
                    "measuredAt": "2026-08-30T07:00:00Z",
                    "measurement": {
                        "precision": "1",
                        "unit": "ms",
                        "value": "42.1",
                    },
                    "metric": "hrv-rmssd",
                    "missingness": {
                        "status": "observed",
                    },
                    "recordType": "nutrition-biometric-observation",
                    "schemaVersion": "1.0.0",
                },
            ],
            "windowDays": 14,
        },
    )
    print(res.status_code, res.text)