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561 Group Heart-Rate Threshold
x402
561 Group Heart-Rate Threshold is a paid API for AI agents from market.561.group, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-14).
Computes the Workwell Foundation resting-heart-rate+15bpm pacing ceiling heuristic to determine a safe heart-rate threshold for pacing, labeled as an unvalidated clinical rule of thumb.
Price / call$0.01
Success—
StatusUnknown
How this service works
Heart-Rate Threshold: the Workwell Foundation resting-heart-rate+15bpm pacing-ceiling heuristic, labeled as an unvalidated clinical rule of thumb. Stateless: nothing submitted or computed is stored.
Output
Returns the computed heart-rate pacing ceiling in bpm (resting heart rate + 15 bpm), accompanied by a label noting this is the Workwell Foundation heuristic and is unvalidated as a clinical rule. No data is stored; the computation is fully stateless.
Example use cases
ME/CFS daily pacing ceiling check
“My resting heart rate this morning was 72 bpm. Can you calculate my heart rate pacing ceiling using the resting HR plus 15 rule so I know what to stay under during any activity today?”
Fitness app safe-zone boundary
“A user's average resting heart rate is 58 bpm. What does the Workwell Foundation heuristic say their maximum safe heart rate threshold should be for pacing purposes?”
Telehealth pre-session pacing briefing
“Before my patient's session, can you compute their pacing ceiling? Their resting heart rate is 80 bpm — apply the plus-15 bpm heuristic and note that it's an unvalidated rule of thumb.”
Technical details
Endpoint
POSThttps://market.561.group/v1/pacing/heart-rate-threshold?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, stateless, single-call computation of the Workwell Foundation pacing ceiling heuristic (resting HR + 15 bpm) — especially in ME/CFS, chronic illness, or post-exertional malaise contexts. Prefer it over the full 561-group-pacing-analysis endpoint when you only need the threshold value and not a rolling biometric observation report. Ideal for apps, agents, or telehealth tools that want a cheap ($0.01), fast, no-storage calculation with a clear unvalidated-heuristic disclaimer included in the response.
Side effects
- Missing or non-numeric resting heart rate input returns a validation error
- Resting heart rate value outside physiologically plausible range may be rejected or flagged
- Payment failure via x402 protocol results in a 402 response with no computation returned
- Malformed request body returns a 400-level error
Tags
x402
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