Zus Health · Rate Limits

Zus Rate Limits

Zus documents a rate limit on the OAuth2 token endpoint of 200 token requests per hour per App Client for machine-to-machine flows; user authentication via username and password is not subject to this limit. FHIR search responses are paginated with a default page size of 10 resources, expandable up to 500. Bundle transactions accept up to 100 entries. Broader per-endpoint request rate limits for the FHIR API are not published and are not reconciled in this artifact.

Zus Rate Limits is the machine-readable rate-limit profile for Zus Health on the APIs.io network, in the API Commons Rate Limits shape.

It captures 4 rate-limit definitions, measuring requests, resources, and entries.

An exhausted limit returns HTTP 429.

This profile was written by API Evangelist and has not been verified against a page the provider published; treat every limit as unconfirmed until a dated transcription replaces it.

The profile also includes 2 backoff/retry policies defined and response codes documented for throttled.

Tagged areas include Health, FHIR, Interoperability, Patient Data, and Healthcare.

4 Limits Exhausted: HTTP 429
Method: generated, dated 2026-06-21.
Written by API Evangelist on 2026-06-21 and not verified against a page the provider published. Treat every limit as unconfirmed until a dated transcription replaces it.
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HealthFHIRInteroperabilityPatient DataHealthcareRate LimitingQuotasThrottling

Limits

Token Endpoint Requests app-client
requests
200 per hour
Machine-to-machine token requests per App Client; user/password auth is exempt.
FHIR Search Page Size request
resources
10 default, 500 maximum
Default page size 10, expandable up to 500 via _count.
Bundle Entries request
entries
100
Maximum entries per FHIR transaction or batch Bundle.
FHIR API Request Rate account
requests
see provider documentation
Per-endpoint FHIR request rate limits are not publicly documented.

Policies

Backoff Strategy
Clients should implement exponential backoff with jitter and honor Retry-After on 429 responses.
Token Reuse
Access tokens are valid for one hour (expires_in 3600); reuse tokens rather than re-minting to stay within the token endpoint limit.

Sources

Work with this as data

Every rate limit here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for rate limits

4 MCP tools reach this
  • find_rate_limitsBrowse and filter every rate limit in the catalog.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This rate limit 
curl "https://apis.io/api/v1/rate-limits/zus-rate-limits"
All rate limits 
curl "https://apis.io/api/v1/rate-limits?limit=25"

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