# 561-Group Pacing Analysis

> 561-Group Pacing Analysis is a paid API for AI agents from market.561.group, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-10).

Analyzes caller-submitted biometric observations to produce a full pacing report including rolling baselines, morning deviation, resting-heart-rate threshold estimate, and PEM risk flag for ME/CFS energy management.

## Facts

- Endpoint: POST https://market.561.group/v1/pacing/analysis?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/561-group-pacing-analysis-2b78331c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AooF_WH-5CxT4wJmsKdzq

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability 561-group-pacing-analysis-2b78331c -d '<json body>'
```

Example prompt: Run a full pacing analysis on my biometric data — here are my resting heart rate readings and morning measurements from the past two weeks — and tell me my rolling baseline, morning deviation, estimated HR threshold, and whether I'm at conservative PEM risk.

## When to prefer this

Choose this endpoint when you need a comprehensive, single-call pacing report that combines rolling baseline computation, morning deviation scoring, HR threshold estimation, and PEM risk flagging in one response — especially for ME/CFS or similar post-viral fatigue contexts. Prefer it over the sibling 561-group-hr-threshold endpoint when you want the full multi-metric analyzePacing report rather than just the isolated Workwell Foundation threshold calculation.

## Known failure modes

- Insufficient biometric observations provided — too few data points to compute a meaningful rolling baseline
- Missing or malformed morning heart rate fields causing deviation computation to fail
- Heart rate values outside plausible physiological ranges rejected as invalid input
- Payment not completed or underfunded resulting in 402 response before analysis runs
- Schema validation error if required observation fields are absent or incorrectly typed

## How this service works

Pacing Analysis: the full analyzePacing report over caller-submitted biometric observations -- rolling baselines, morning deviation, resting-heart-rate threshold estimate, and conservative PEM risk flags, each with citations and epistemic labels. Stateless: nothing submitted or computed is stored.

## Output

Returns a full analyzePacing report containing: rolling heart rate baseline computed from submitted observations, morning deviation score relative to that baseline, an estimated resting-heart-rate-based pacing ceiling (Workwell Foundation +15 bpm heuristic), and a conservative binary PEM risk flag indicating whether the submitter is approaching or exceeding safe exertion limits.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/561-group-pacing-analysis-2b78331c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from market.561.group](https://www.zero.xyz/host/market.561.group/llms.txt)