diff --git a/client/duneapi/client.go b/client/duneapi/client.go
index da1e611..5d88a89 100644
--- a/client/duneapi/client.go
+++ b/client/duneapi/client.go
@@ -69,7 +69,6 @@ func New(log *slog.Logger, cfg Config) (*client, error) { // revive:disable-line
 }
 
 // SendBlock sends a block to DuneAPI
-// TODO: support batching multiple blocks in a single request
 func (c *client) SendBlock(ctx context.Context, payload models.RPCBlock) error {
 	buffer := c.bufPool.Get().(*bytes.Buffer)
 	defer c.bufPool.Put(buffer)
@@ -87,12 +86,14 @@ func (c *client) buildRequest(payload models.RPCBlock, buffer *bytes.Buffer) (Bl
 	if c.cfg.DisableCompression {
 		request.Payload = payload.Payload
 	} else {
+		// not thread safe, multiple calls to the compressor here
 		buffer.Reset()
 		c.compressor.Reset(buffer)
 		_, err := c.compressor.Write(payload.Payload)
 		if err != nil {
 			return request, err
 		}
+		c.compressor.Close()
 		request.ContentEncoding = "application/zstd"
 		request.Payload = buffer.Bytes()
 	}
@@ -146,7 +147,9 @@ func (c *client) sendRequest(ctx context.Context, request BlockchainIngestReques
 		return err
 	}
 	defer resp.Body.Close()
-	responseStatus = resp.Status
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("unexpected status code: %v, %v", resp.StatusCode, resp.Status)
+	}
 	err = json.NewDecoder(resp.Body).Decode(&response)
 	if err != nil {
 		return err