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Rate Limit

Discover how TheirStack API rate limits work across free and paid tiers, with sliding windows, IETF-compliant headers, and retry best practices.

All API endpoints are rate limited to ensure reliability and fair usage. When a limit is exceeded, the API returns HTTP 429 Too Many Requests. Limits are applied per user with sliding windows; multiple windows may apply simultaneously.

Tiered endpoints and limits

Endpoints covered by tier-based limits:

  • POST /v1/jobs/search (Jobs Search)
  • POST /v1/companies/search (Companies Search)
  • POST /v1/companies/technologies (Technographics)

Shared limits across all three endpoints:

TierAPI limits
Free4/second, 10/minute, 50/hour, 400/day
Paid4/second
  • Paid tier applies to users who have made at least one payment.
  • Free tier applies to all other users (users who have never paid or users without any payments done).

Multiple limits are applied simultaneously. A request is rejected if it exceeds any active window.

Rate limit headers

The API returns rate limit information in every response. We follow the IETF HTTPAPI draft for RateLimit headers: RateLimit header fields for HTTP. When multiple rate limits apply, header items are comma-separated and ordered consistently across headers.

IETF compliant headers

  • RateLimit: Current quota status per policy. Format: "<policy-name>"; r=<remaining-requests>; t=<time-until-reset>; pk=<partition-key>.
  • RateLimit-Policy: Applied policy definition. Format: "<policy-name>"; q=<limit>; w=<window-seconds>.

Other headers

These are included for client convenience:

  • RateLimit-Limit: Total allowed requests for each window
  • RateLimit-Remaining: Requests remaining in each window
  • RateLimit-Reset: Seconds until the current window resets

The order of values in legacy headers matches the order of RateLimit items.

Example response headers:

RateLimit: "per-second";r=3;t=1;pk="dXNlcjoxMjM0", "per-minute";r=9;t=60;pk="dXNlcjoxMjM0", "per-hour";r=49;t=3600;pk="dXNlcjoxMjM0", "per-day";r=399;t=86400;pk="dXNlcjoxMjM0"
RateLimit-Policy: "per-second";q=4;w=1, "per-minute";q=10;w=60, "per-hour";q=50;w=3600, "per-day";q=400;w=86400
RateLimit-Limit: 4, 10, 50, 400
RateLimit-Remaining: 3, 9, 49, 399
RateLimit-Reset: 1, 60, 3600, 86400

Exceeding limits and best practices

  • Retry with exponential backoff on HTTP 429 responses.
  • Monitor RateLimit or RateLimit-Remaining and RateLimit-Reset to avoid hitting limits.
  • Prefer batching and caching to reduce request counts.
  • Avoid concurrent bursts that violate per-second limits.

How is this guide?

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Pagination

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Free count

Discover how to use TheirStack's free count feature to estimate matching records in Job and Company Search endpoints without spending API credits.

On this page

Tiered endpoints and limits
Rate limit headers
IETF compliant headers
Other headers
Exceeding limits and best practices