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Rate limits are enforced at the Vercel Edge runtime using Upstash Redis counters. All limits are sliding 60-second windows unless noted.

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Default public API rate limit

Applies to all /api/* routes that don’t have a stricter override. Implemented by api/_rate-limit.js (legacy api/*.js edge functions) and server/_shared/rate-limit.ts (the gateway and .ts edge functions).

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MCP server

The MCP per-minute burst is set by plan, and it is per account for OAuth tokens and dashboard-issued wm_… keys alike. See MCP for details.

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Per-plan API rate limits

Authenticated REST API keys (wm_…) are limited per account, not per IP — a key behind a shared egress IP is not throttled by other tenants’ traffic, and all of an account’s keys share one allowance.
  • Per-minute is a hard burst limit — exceeding it returns 429 immediately.
  • Daily included is your plan’s allowance; it resets at 00:00 UTC. Requests beyond it are rejected with 429 — the sold plan limit is authoritative, with no overage headroom. Usage is metered against the same counter that enforces, so the Settings notice and the 429 agree.
  • MCP calls draw on this same daily allowance. An API plan has one budget covering both REST requests and MCP tool calls; there is no separate MCP allowance to track. An MCP call that answers from cache costs the same as one REST request, one that fetches live data downstream costs two, and get_country_brief and get_airspace cost three. See MCP calls against an API plan.
  • The per-minute burst and daily allowance are both per account (shared across all of an account’s wm_… keys), so issuing more keys does not raise your limit. (Operator-issued Enterprise keys are the exception — each is rate-limited independently.)
  • Need a higher limit? Contact support to raise your plan’s allowance.

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MCP calls against an API plan

API Starter and API Business do not carry a separate MCP allowance. Their MCP tool calls draw on the same daily budget as their REST requests, so 1,000 requests/day on API Starter is 1,000 units of work per UTC day however you spend it. A single MCP tool call is not always one unit, because the tools do not cost the same: A weighted call is all-or-nothing. With 999 of 1,000 units spent, a 2-unit call is rejected rather than partly served. describe_tool and get_sources charge nothing, as do all the discovery methods. You do not have to read this table to know what a call costs. Every tools/list and describe_tool entry carries its own price at _meta["worldmonitor/weight"], so a client can budget before it calls. The number is what the tool costs; whether it is charged is _meta["worldmonitor/access"]’s question, and only an API plan pays the weight — Pro and Pro Business pay one unit per call whatever the weight says. Today the REST and MCP halves reserve against separate counters that each hold the plan’s full number, so an MCP-only workload and a REST-only workload both get the whole 1,000 or 10,000. They become one physical counter when REST enforcement turns on. Plan against the combined figure, because that is the allowance the plan sells and the merge will not raise it. Pro and Pro Business are unaffected. They have no REST budget, so their MCP calls are metered on their own counter at 50 and 250 per day, with every call costing one.

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Dashboard AI quota

Dashboard and direct REST AI operations use a separate daily budget from MCP. The counter resets at 00:00 UTC. Free and signed-out dashboard users keep the normal keyword/cache fallback for feed enrichment; they do not consume the paid direct-AI budget. These limits are independent of the MCP allowances above. Signed-out callers are rejected outright, and Pro-gated AI routes deny free accounts before any spend. Separately from these plan allowances, a small non-plan safety floor of 50 requests/day applies to any caller whose paid entitlement cannot be confirmed at request time — a lapsed subscription, or a transient entitlement-lookup outage. It exists so an outage degrades gracefully instead of rejecting paying customers; it is not an allowance any plan includes, and it is never larger than the smallest paid allowance.

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Stock backtest provider-work quota

GET /api/market/v1/backtest-stock is not LLM-backed. On a cache miss it fetches Yahoo Finance history for a caller-chosen symbol, so it must not share llm:direct-usage or dashboardAiCallsPerDay. Independently of the 60 requests / 60 s route policy: The 200 ceiling is four full 50-symbol Pro watchlist hydrations. Cached repeats and invalid symbols do not consume the budget. Exceeding it returns 429 with Retry-After until the next 00:00 UTC. If the quota store cannot prove a reservation, the route fails closed with 503 rather than fetching Yahoo.

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OAuth endpoints

Matches the implementations in api/oauth/register.js, api/oauth/authorize.js, and api/oauth/token.ts. For /api/oauth/token, the limiter key is client_secret hash for client_credentials, then client_id when present, and only falls back to caller IP when neither credential identifier is available. All three grant types (authorization_code, refresh_token, client_credentials) fail open when the Upstash limiter is unconfigured or throws. Token persistence still fails closed when Redis storage is down; a limiter-only 503 would abort MCP client handshakes during an SDK timeout even when the pipeline path still works. client_credentials keeps the operator env-key allowlist as a second gate. Degradation is observable: a bounded/deduplicated [rate-limit] redis-error log and Sentry capture, X-RateLimit-Mode: degraded on the response (listed in Access-Control-Expose-Headers so cross-origin JS can read it), and a usage reason of rate_limit_degraded. Genuine budget exhaustion remains HTTP 429 rate_limit_exceeded. Exceeding any of these during the OAuth flow will cause the MCP client to fail the connection handshake — wait 60 s and retry.

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Provider proxies

Routes that fetch a third-party host on our behalf carry their own per-IP budget, so a single scripted caller cannot drive unbounded traffic to a provider we do not control. These budgets are per IP, not aggregate: they bound any one caller, but they do not cap total egress across all callers. The two edge handlers (/api/skills/fetch-agentskills, /api/youtube/live) enforce their budgets in-handler via checkScopedRateLimit/checkRateLimit; /api/reverse-geocode mirrors its per-IP budget as a literal constant per api/*.js constraints. /api/infrastructure/v1/reverse-geocode is a gateway RPC, so the gateway enforces its per-IP budget through checkEndpointRateLimit (fail-closed on Redis outage). After a shared-cache miss, both reverse-geocode handlers also use one fail-closed provider-wide Redis bucket capped at 1 request per second before they call Nominatim; cache hits do not consume that aggregate budget.

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Write endpoints

Other write endpoints (/api/brief/share-url, /api/notification-channels, /api/create-checkout, /api/customer-portal, etc.) fall back to the default per-IP limit above.

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Bootstrap / health / version

These mostly use the default public API limit. Cache headers vary by endpoint:
  • GET /api/bootstrap — only the explicitly-marked ?...&public=1 URLs are shared-cacheable. ?tier=fast&public=1 / ?tier=slow&public=1 use browser max-age=60 / max-age=300 and CDN s-maxage=600 / s-maxage=7200. Single-key public URLs: on-demand keys (?keys=<onDemandName>&public=1) inherit the slow profile — browser max-age=300, CDN s-maxage=7200 — unless the key declares its own, which every key published more often than that shield does: correlationCards (browser max-age=60, CDN s-maxage=300), chinaDecisionSignals (browser max-age=60, CDN s-maxage=900), canadaRoads (browser max-age=60, CDN s-maxage=900), albertaRoads (browser max-age=60, CDN s-maxage=900), manitobaRoads (browser max-age=60, CDN s-maxage=900), marketCorrelationSeries (browser max-age=60, CDN s-maxage=900), imdCycloneMarine (browser max-age=60, CDN s-maxage=900), bcOpen511 (browser max-age=60, CDN s-maxage=1800), flightDelays (browser max-age=60, CDN s-maxage=1800), and forecasts (browser max-age=300, CDN s-maxage=3600); ?keys=weatherAlerts&public=1 uses Cache-Control: public, s-maxage=600, stale-while-revalidate=120, stale-if-error=900 with the fast-tier CDN shield. Every other shape — key-authenticated, session-authenticated, the unmarked ?tier=... URLs, and the anonymous ?keys=weatherAlerts path — uses Cache-Control: no-store and emits no CDN cache headers, so a credentialed URL can never be answered from a shared cache. User API key validation also has a fail-closed fixed 60 s per-IP pre-validation limit of 600 attempts.
  • GET /api/health — private, no-store, max-age=0 plus CDN-Cache-Control: no-store.
  • GET /api/version — public, s-maxage=300, stale-while-revalidate=60, stale-if-error=3600.

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Rate limit response headers (self-throttle before a 429)

Every /api/* response — success or error — advertises the IETF RateLimit header fields so an agent can pace itself before it trips a 429:
  • RateLimit-Policy — the applicable quota (q) over a window of w seconds for the default sliding window. Stricter per-endpoint, per-plan, and OAuth limits (see the tables above) apply on those routes.
  • RateLimit-Limit — the same quota as a bare integer, for parsers that predate the structured-field draft.
These are static advertisements, so they add no latency on the hot path. The legacy X-RateLimit-* names are also emitted for back-compat.

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Response when limited

An HTTP 429 additionally carries the live per-window counters (remaining is 0; the reset and Retry-After are delta-seconds) plus the combined RateLimit member:
Note the IETF RateLimit-Reset (and the t value in the combined RateLimit member) is seconds remaining, whereas the legacy X-RateLimit-Reset is an absolute epoch in milliseconds. For a daily-ceiling 429 the Retry-After counts down to the next 00:00 UTC.

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Retry guidance

  • Respect Retry-After. Don’t pound on a 429.
  • For batch work, pace yourself: at 600 req/min/IP the default gives you ~10 req/s headroom.
  • For MCP, the 60/min on Pro, Pro Business and API Starter is generous for conversational use but tight for scripted batch fetches. Prefer the REST API for batch, or API Business at 300/min.
  • Spurious 429s often mean you’re sharing an egress IP (corporate proxy, CI runner). Contact support for a per-key limit bump if needed.

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Customer notifications and paid-plan caps

API and MCP plan caps are tracked against the product catalog limits that ship with entitlements: Pro and Pro Business have no REST allowance, so their MCP calls are counted separately, one unit per call. API plans have one budget. The “MCP calls / day” column is not an additional allowance on top of the API one, it is the same number, spent at the per-tool weight. When a paid user approaches or exceeds one of these limits, WorldMonitor records a compact Convex rollup and opens a current account notice in Settings. The daily count is read from the same per-account meter that governs enforcement, so a warning reflects the same usage number the plan is metered against. Daily limits warn at 80% and switch to over-limit at 100%; burst limits only notify on sustained pressure, not a single isolated spike. If the notice is still current, a Resend-backed lifecycle sends an email at a bounded cadence. The email and dashboard notice explain the current usage, the relevant plan limit, and the available options: reduce traffic, wait for reset, upgrade when a self-serve path exists, or contact support when the next tier is not self-serve. WorldMonitor does not automatically upgrade a user, charge for overages, or move a customer into API Business because they crossed a cap. Any future hard enforcement for paid plans must first pass the internal apiPlanLimitNotices.getEnforcementReadiness gate: no stale usage source, no pending/failed email, and no blocked self-serve upgrade path.

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Hard caps (not soft limits)

  • Webhook callback URLs must be HTTPS (except localhost).
  • api/download file sizes capped at ~50 MB per request.
  • POST /api/scenario/v1/run-scenario globally pauses new jobs when the pending queue exceeds 100 — returns 429.
  • api/v2/shipping/webhooks TTL is 30 days — re-register to extend.