Microsoft Project · Rate Limits

Microsoft Project Rate Limits

Microsoft Project Online APIs are hosted on SharePoint Online, so they inherit SharePoint's per-user / per-tenant throttling, plus Power Platform request limits via the Microsoft 365 license category. Limits are enforced via 429 / 503 responses with Retry-After headers; clients must honor the header. There is no published per-second cap — Microsoft uses a dynamic algorithm based on resource consumption.

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

It captures 3 rate-limit definitions, measuring varies and requests_per_day.

Limit state is signalled in the retryAfter, ratelimitLimit, ratelimitRemaining, and ratelimitReset response headers, and 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 5 backoff/retry policies defined and response codes documented for throttled and serviceUnavailable.

Tagged areas include Rate Limiting, Project Management, Microsoft, and SharePoint.

3 Limits Exhausted: HTTP 429 retryAfterratelimitLimitratelimitRemainingratelimitReset
Method: generated, dated 2026-05-05.
Written by API Evangelist on 2026-05-05 and not verified against a page the provider published. Treat every limit as unconfirmed until a dated transcription replaces it.
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Rate LimitingProject ManagementMicrosoftSharePoint

Limits

SharePoint Online dynamic throttling account
varies
Dynamic per-user / per-tenant throttling based on resource consumption; no published per-second cap.
SharePoint enforces both 429 and 503 responses. Clients must read Retry-After and back off.
Power Platform requests (Microsoft 365 / Project license) account
requests_per_day · day
6000
Project Online / Plan 1 / Plan 3 fall in the Microsoft 365 + Project Online (Plan 1, 3, 5) category at 6,000 PPR per user per 24 hours.
Power Platform non-licensed pool (Power Apps / Automate, Project tenant) account
requests_per_day · day
25000
Tenant-pooled non-licensed identities (service principals, application users).

Policies

Honor Retry-After
SharePoint and Project Online responses with 429 or 503 include a Retry-After header. Wait for the indicated number of seconds before retrying. Failure to honor results in temporary blocking.
Decorate user-agent
Microsoft requires a meaningful User-Agent header (ISV|company|product/version) on CSOM and REST traffic; undecorated traffic is more aggressively throttled.
Reduce concurrency
Lower the number of parallel threads / connections from a single account before lowering the per-second rate.
Use sandbox (test) tenants
Do not load-test against production; Microsoft does not offer a higher rate for testing.
24-hour PPR window
Power Platform request entitlement is a sliding 24-hour window; limits do not roll over.

Sources

Work with this as data

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

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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

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This rate limit 
curl "https://apis.io/api/v1/rate-limits/microsoft-project-rate-limits"
All rate limits 
curl "https://apis.io/api/v1/rate-limits?limit=25"

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