diff --git a/checker/interactive.go b/checker/interactive.go
deleted file mode 100644
index 4c00bd5..0000000
--- a/checker/interactive.go
+++ /dev/null
@@ -1,48 +0,0 @@
-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 7952ae0..8066ae2 100644
--- a/checker/report.go
+++ b/checker/report.go
@@ -5,8 +5,6 @@ import (
 	"fmt"
 	"html/template"
 	"strings"
-
-	sdk "git.happydns.org/checker-sdk-go/checker"
 )
 
 // ── HTML report ───────────────────────────────────────────────────────────────
@@ -289,9 +287,9 @@ li { margin-bottom: .15rem; }
 )
 
 // GetHTMLReport implements sdk.CheckerHTMLReporter.
-func (p *matrixProvider) GetHTMLReport(ctx sdk.ReportContext) (string, error) {
+func (p *matrixProvider) GetHTMLReport(raw json.RawMessage) (string, error) {
 	var r MatrixFederationData
-	if err := json.Unmarshal(ctx.Data(), &r); err != nil {
+	if err := json.Unmarshal(raw, &r); err != nil {
 		return "", fmt.Errorf("failed to unmarshal matrix report: %w", err)
 	}
 
diff --git a/checker/rule.go b/checker/rule.go
index 8184137..5132325 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 8c5c78c..28304e8 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 v1.2.0
+require git.happydns.org/checker-sdk-go v0.0.1
diff --git a/go.sum b/go.sum
index 272600a..5282be1 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,2 @@
-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=
+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=