diff --git a/checker/interactive.go b/checker/interactive.go
new file mode 100644
index 0000000..4c00bd5
--- /dev/null
+++ b/checker/interactive.go
@@ -0,0 +1,48 @@
+package checker
+
+import (
+	"errors"
+	"net/http"
+	"strings"
+
+	sdk "git.happydns.org/checker-sdk-go/checker"
+)
+
+// RenderForm implements sdk.CheckerInteractive.
+func (p *matrixProvider) RenderForm() []sdk.CheckerOptionField {
+	return []sdk.CheckerOptionField{
+		{
+			Id:          "serviceDomain",
+			Type:        "string",
+			Label:       "Matrix domain",
+			Placeholder: "matrix.org",
+			Required:    true,
+		},
+		{
+			Id:          "federationTesterServer",
+			Type:        "string",
+			Label:       "Federation Tester Server",
+			Placeholder: "https://federationtester.matrix.org/api/report?server_name=%s",
+			Default:     "https://federationtester.matrix.org/api/report?server_name=%s",
+			Description: "URL template of the federation tester API; %s is replaced by the domain.",
+		},
+	}
+}
+
+// ParseForm implements sdk.CheckerInteractive.
+func (p *matrixProvider) ParseForm(r *http.Request) (sdk.CheckerOptions, error) {
+	domain := strings.TrimSpace(r.FormValue("serviceDomain"))
+	if domain == "" {
+		return nil, errors.New("Matrix domain is required")
+	}
+
+	opts := sdk.CheckerOptions{
+		"serviceDomain": domain,
+	}
+
+	if tester := strings.TrimSpace(r.FormValue("federationTesterServer")); tester != "" {
+		opts["federationTesterServer"] = tester
+	}
+
+	return opts, nil
+}
diff --git a/checker/report.go b/checker/report.go
index 8066ae2..7952ae0 100644
--- a/checker/report.go
+++ b/checker/report.go
@@ -5,6 +5,8 @@ import (
 	"fmt"
 	"html/template"
 	"strings"
+
+	sdk "git.happydns.org/checker-sdk-go/checker"
 )
 
 // ── HTML report ───────────────────────────────────────────────────────────────
@@ -287,9 +289,9 @@ li { margin-bottom: .15rem; }
 )
 
 // GetHTMLReport implements sdk.CheckerHTMLReporter.
-func (p *matrixProvider) GetHTMLReport(raw json.RawMessage) (string, error) {
+func (p *matrixProvider) GetHTMLReport(ctx sdk.ReportContext) (string, error) {
 	var r MatrixFederationData
-	if err := json.Unmarshal(raw, &r); err != nil {
+	if err := json.Unmarshal(ctx.Data(), &r); err != nil {
 		return "", fmt.Errorf("failed to unmarshal matrix report: %w", err)
 	}
 
diff --git a/checker/rule.go b/checker/rule.go
index 5132325..8184137 100644
--- a/checker/rule.go
+++ b/checker/rule.go
@@ -27,14 +27,14 @@ func (r *matrixRule) ValidateOptions(opts sdk.CheckerOptions) error {
 	return nil
 }
 
-func (r *matrixRule) Evaluate(ctx context.Context, obs sdk.ObservationGetter, opts sdk.CheckerOptions) sdk.CheckState {
+func (r *matrixRule) Evaluate(ctx context.Context, obs sdk.ObservationGetter, opts sdk.CheckerOptions) []sdk.CheckState {
 	var data MatrixFederationData
 	if err := obs.Get(ctx, ObservationKeyMatrix, &data); err != nil {
-		return sdk.CheckState{
+		return []sdk.CheckState{{
 			Status:  sdk.StatusError,
 			Message: fmt.Sprintf("Failed to get Matrix federation data: %v", err),
 			Code:    "matrix_federation_error",
-		}
+		}}
 	}
 
 	domain, _ := opts["serviceDomain"].(string)
@@ -42,14 +42,14 @@ func (r *matrixRule) Evaluate(ctx context.Context, obs sdk.ObservationGetter, op
 
 	if data.FederationOK {
 		version := strings.TrimSpace(data.Version.Name + " " + data.Version.Version)
-		return sdk.CheckState{
+		return []sdk.CheckState{{
 			Status:  sdk.StatusOK,
 			Message: fmt.Sprintf("Running %s", version),
 			Code:    "matrix_federation_ok",
 			Meta: map[string]any{
 				"version": version,
 			},
-		}
+		}}
 	}
 
 	var statusLine string
@@ -73,9 +73,9 @@ func (r *matrixRule) Evaluate(ctx context.Context, obs sdk.ObservationGetter, op
 		statusLine = fmt.Sprintf("Federation broken. Check https://federationtester.matrix.org/#%s", domain)
 	}
 
-	return sdk.CheckState{
+	return []sdk.CheckState{{
 		Status:  sdk.StatusCrit,
 		Message: statusLine,
 		Code:    "matrix_federation_fail",
-	}
+	}}
 }
diff --git a/go.mod b/go.mod
index 28304e8..8c5c78c 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,4 @@ module git.happydns.org/checker-matrix
 
 go 1.25.0
 
-require git.happydns.org/checker-sdk-go v0.0.1
+require git.happydns.org/checker-sdk-go v1.2.0
diff --git a/go.sum b/go.sum
index 5282be1..272600a 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,2 @@
-git.happydns.org/checker-sdk-go v0.0.1 h1:4RxCJr73HWKxjOyU/6NJMO8lXJmH0gMLA68EzTqLbQI=
-git.happydns.org/checker-sdk-go v0.0.1/go.mod h1:aNAcfYFfbhvH9kJhE0Njp5GX0dQbxdRB0rJ0KvSC5nI=
+git.happydns.org/checker-sdk-go v1.2.0 h1:v4MpKAz0W3PwP+bxx3pya8w893sVH5xTD1of1cc0TV8=
+git.happydns.org/checker-sdk-go v1.2.0/go.mod h1:aNAcfYFfbhvH9kJhE0Njp5GX0dQbxdRB0rJ0KvSC5nI=