diff --git a/app/routes/v1.py b/app/routes/v1.py
index c6024ac..557106b 100644
--- a/app/routes/v1.py
+++ b/app/routes/v1.py
@@ -61,8 +61,14 @@ def _caller(request: Request) -> tuple[str, str, str]:
     return subject, org_id, user_id
 
 
-async def _rate_limited(request: Request, subject: str, request_id: str):
-    limit = Config.V1_RATE_LIMIT_PER_MINUTE
+async def _rate_limited(request: Request, subject: str, org_id: str, request_id: str):
+    """limit is the caller's organization's plan-specific override
+    (published by omnibioai-billing's gateway_quota_sync_service.py)
+    when one is set, falling back to the configured global default --
+    `is not None`, not `or`, since a plan-specific limit of exactly 0
+    is a real (if unusual) value, not "unset"."""
+    org_limit = await store.rate_limit_for_org(org_id) if org_id else None
+    limit = org_limit if org_limit is not None else Config.V1_RATE_LIMIT_PER_MINUTE
     allowed, remaining, reset = await store.hit_rate_limit(subject, limit)
     headers = {
         "X-RateLimit-Limit": str(limit),
@@ -124,7 +130,7 @@ async def _handle_billable_literature_call(
     except UnsupportedRequestError as exc:
         return _error(400, "unsupported_request", exc.message, request_id, detail={"field": exc.field})
 
-    headers, limited = await _rate_limited(request, subject, request_id)
+    headers, limited = await _rate_limited(request, subject, org_id, request_id)
     if limited:
         return limited
 
@@ -226,8 +232,8 @@ async def literature_studies(request: Request):
     """Free: the queryable studies/domains, from omnibioai-rag GET /v1/studies.
     Rate-limited like every /v1 call, never billed."""
     request_id = getattr(request.state, "trace_id", "")
-    subject, _, _ = _caller(request)
-    headers, limited = await _rate_limited(request, subject, request_id)
+    subject, org_id, _ = _caller(request)
+    headers, limited = await _rate_limited(request, subject, org_id, request_id)
     if limited:
         return limited
     status, response = await _forward(request, "GET", "v1/studies")
@@ -245,8 +251,8 @@ async def literature_domains(request: Request):
     call, reshaped to the public contract. Rate-limited like every /v1
     call, never billed."""
     request_id = getattr(request.state, "trace_id", "")
-    subject, _, _ = _caller(request)
-    headers, limited = await _rate_limited(request, subject, request_id)
+    subject, org_id, _ = _caller(request)
+    headers, limited = await _rate_limited(request, subject, org_id, request_id)
     if limited:
         return limited
     status, response = await _forward(request, "GET", "v1/studies")
@@ -282,7 +288,7 @@ async def literature_usage(request: Request):
         return _error(403, "organization_required",
                       "This API is billed to an organization; your account has none.", request_id)
 
-    headers, limited = await _rate_limited(request, subject, request_id)
+    headers, limited = await _rate_limited(request, subject, org_id, request_id)
     if limited:
         return limited
 
@@ -333,8 +339,8 @@ async def literature_models(request: Request):
     passes back as this endpoint's own `model` request field).
     """
     request_id = getattr(request.state, "trace_id", "")
-    subject, _, _ = _caller(request)
-    headers, limited = await _rate_limited(request, subject, request_id)
+    subject, org_id, _ = _caller(request)
+    headers, limited = await _rate_limited(request, subject, org_id, request_id)
     if limited:
         return limited
     models = [
diff --git a/app/services/v1_store.py b/app/services/v1_store.py
index 22fdb18..8c8a6e5 100644
--- a/app/services/v1_store.py
+++ b/app/services/v1_store.py
@@ -122,6 +122,33 @@ async def hit_rate_limit(self, subject: str, limit: int) -> tuple[bool, int, int
             return True, limit, reset
         return count <= limit, max(0, limit - count), reset
 
+    # ---------------- rate limit override (maintained by omnibioai-billing)
+    def _org_rate_limit_key(self, org_id: str) -> str:
+        # Nested under the same "quota:" prefix omnibioai-billing's
+        # gateway_quota_sync_service.py already writes allowance keys
+        # to -- deliberately not a new "ratelimit:" top-level prefix,
+        # so this reuses that service's existing Redis ACL grant
+        # (~gateway:v1:quota:*) exactly as-is. See that module's own
+        # docstring for the full reasoning.
+        return f"{_PREFIX}quota:{org_id}:ratelimit"
+
+    async def rate_limit_for_org(self, org_id: str) -> Optional[int]:
+        """The org's plan-specific requests-per-minute override, or
+        None when no plan override is set (every plan this platform
+        currently seeds leaves it unset -- a real number is a product
+        decision, not an engineering one) or on a Redis error. Callers
+        fall back to the configured global default in either case."""
+        try:
+            raw = await self.redis.get(self._org_rate_limit_key(org_id))
+        except Exception:
+            return None
+        if raw is None:
+            return None
+        try:
+            return int(raw)
+        except ValueError:
+            return None
+
     # ---------------- quota (maintained by omnibioai-billing) -------------
     def _quota_key(self, org_id: str, resource: str) -> str:
         return f"{_PREFIX}quota:{org_id}:{resource}"
diff --git a/tests/test_v1_literature.py b/tests/test_v1_literature.py
index ee0bfb0..37aeb31 100644
--- a/tests/test_v1_literature.py
+++ b/tests/test_v1_literature.py
@@ -222,6 +222,65 @@ def test_rate_limit(client, redis, upstream, monkeypatch):
     assert len(_usage(redis)) == 2
 
 
+def test_rate_limit_uses_the_organizations_plan_specific_override(client, redis, upstream, monkeypatch):
+    """omnibioai-billing publishes this org's plan-specific override
+    under gateway:v1:quota:{org}:ratelimit (see
+    gateway_quota_sync_service.py) -- when set, it wins over the
+    configured global default."""
+    monkeypatch.setattr(Config, "V1_RATE_LIMIT_PER_MINUTE", 100)
+    redis.kv["gateway:v1:quota:42:ratelimit"] = 1
+
+    first = _post(client)
+    assert first.status_code == 200
+    assert first.headers["X-RateLimit-Limit"] == "1"
+    second = _post(client)
+    assert second.status_code == 429
+
+
+def test_rate_limit_falls_back_to_the_global_default_when_no_override_is_set(client, redis, upstream, monkeypatch):
+    monkeypatch.setattr(Config, "V1_RATE_LIMIT_PER_MINUTE", 100)
+    # No gateway:v1:quota:42:ratelimit key at all.
+
+    resp = _post(client)
+    assert resp.headers["X-RateLimit-Limit"] == "100"
+
+
+def test_rate_limit_override_of_zero_is_honored_not_treated_as_unset(client, redis, upstream, monkeypatch):
+    """`is not None`, not a truthiness/`or` check -- a plan-specific
+    limit of exactly 0 is a real (if unusual) value."""
+    monkeypatch.setattr(Config, "V1_RATE_LIMIT_PER_MINUTE", 100)
+    redis.kv["gateway:v1:quota:42:ratelimit"] = 0
+
+    resp = _post(client)
+    assert resp.status_code == 429
+    assert resp.headers["X-RateLimit-Limit"] == "0"
+
+
+def test_rate_limit_override_fails_open_on_redis_error(client, upstream, monkeypatch):
+    """A broken Redis for the rate-limit *lookup* must still let the
+    request through at the global default -- the same fail-open
+    posture every other V1Store method takes on a Redis error."""
+    monkeypatch.setattr(Config, "V1_RATE_LIMIT_PER_MINUTE", 100)
+
+    class BrokenGetRedis:
+        async def get(self, key):
+            raise ConnectionError("redis down")
+
+        async def incr(self, key):
+            return 1
+
+        async def expire(self, key, ttl):
+            return True
+
+    with patch.object(v1.store, "redis", BrokenGetRedis()), \
+         patch.object(v1.store, "usage_redis", BrokenGetRedis()), \
+         patch.object(v1.store, "outbox", Outbox(":memory:")):
+        resp = _post(client)
+
+    assert resp.status_code == 200
+    assert resp.headers["X-RateLimit-Limit"] == "100"
+
+
 def test_quota_exhausted_returns_402_without_calling_upstream(client, redis, upstream):
     redis.kv["gateway:v1:quota:42:literature.answer"] = 0
     resp = _post(client, idem="q-1")
@@ -511,6 +570,17 @@ def test_store_edge_cases(tmp_path):
     assert asyncio.run(store.idempotency_begin("s", "k", "f")) == {"state": "in_progress"}
 
 
+def test_rate_limit_for_org_edge_cases(tmp_path):
+    import asyncio
+    with patch("app.services.v1_store.aioredis.from_url", return_value=FakeRedis()):
+        store = V1Store("redis://x", "redis://y", outbox_path=str(tmp_path / "outbox.db"))
+    assert asyncio.run(store.rate_limit_for_org("1")) is None  # no key set at all
+    store.redis.kv["gateway:v1:quota:1:ratelimit"] = "not-a-number"
+    assert asyncio.run(store.rate_limit_for_org("1")) is None
+    store.redis.kv["gateway:v1:quota:1:ratelimit"] = "30"
+    assert asyncio.run(store.rate_limit_for_org("1")) == 30
+
+
 def test_memory_store_semantics():
     import asyncio