diff --git a/backend/internal/provider/adobe/client.go b/backend/internal/provider/adobe/client.go
index ceaf531..b377cff 100644
--- a/backend/internal/provider/adobe/client.go
+++ b/backend/internal/provider/adobe/client.go
@@ -38,6 +38,15 @@ var (
 	ErrDeadUpstream      = errors.New("adobe upstream fatal error")
 )
 
+// bodyHasInsufficientCredits reports whether an Adobe response body signals the
+// account has run out of generation credits ("insufficient credits"). Such an
+// account is out of quota for this kind of generation, so it's treated as
+// ErrQuotaExhausted: the pool marks it 限额 (per image/video kind) and fails over
+// to the next account instead of surfacing a hard error to the caller.
+func bodyHasInsufficientCredits(body []byte) bool {
+	return strings.Contains(strings.ToLower(string(body)), "insufficient credit")
+}
+
 var profileURLs = []string{
 	"https://ims-na1.adobelogin.com/ims/profile/v1",
 	"https://adobeid-na1.services.adobe.com/ims/profile/v1",
@@ -459,6 +468,9 @@ func (c *Client) submitImage(ctx context.Context, client tlsclient.HttpClient, t
 	if err != nil {
 		return nil, "", err
 	}
+	if bodyHasInsufficientCredits(respBody) {
+		return respBody, "", ErrQuotaExhausted
+	}
 	if resp.StatusCode == 401 || resp.StatusCode == 403 {
 		if strings.EqualFold(resp.Header.Get("x-access-error"), "taste_exhausted") {
 			return respBody, "", ErrQuotaExhausted
@@ -533,6 +545,9 @@ func (c *Client) pollImage(ctx context.Context, client tlsclient.HttpClient, tok
 		if readErr != nil {
 			return nil, nil, readErr
 		}
+		if bodyHasInsufficientCredits(body) {
+			return nil, nil, ErrQuotaExhausted
+		}
 		if b := string(body); strings.Contains(b, "system under load") || strings.Contains(b, "timeout_error") {
 			return nil, nil, ErrTemporaryUpstream
 		}
@@ -631,6 +646,9 @@ func (c *Client) submitVideo(ctx context.Context, client tlsclient.HttpClient, t
 	if err != nil {
 		return nil, "", err
 	}
+	if bodyHasInsufficientCredits(respBody) {
+		return respBody, "", ErrQuotaExhausted
+	}
 	if resp.StatusCode == 401 || resp.StatusCode == 403 {
 		if strings.EqualFold(resp.Header.Get("x-access-error"), "taste_exhausted") {
 			return respBody, "", ErrQuotaExhausted
@@ -707,6 +725,9 @@ func (c *Client) pollVideo(ctx context.Context, client tlsclient.HttpClient, tok
 		if readErr != nil {
 			return nil, nil, readErr
 		}
+		if bodyHasInsufficientCredits(body) {
+			return nil, nil, ErrQuotaExhausted
+		}
 		if resp.StatusCode == 401 || resp.StatusCode == 403 {
 			return nil, nil, fmt.Errorf("%w (%d %s: %s)", ErrAuth, resp.StatusCode, resp.Header.Get("x-access-error"), clip(body, 300))
 		}