Api(dot)securerpc(dot)com/v1 --> Response: flashbot-Method is not supported

Describe the bug flashbots methods are not working api(dot)securerpc(dot)com/v1. I always get a Response: ā€œMethod ā€˜METHODNAMEā€™ is not supported.ā€ tested with flashbots_getUserStats and eth_callBundle

To Reproduce sent header: {ā€˜X-Manifold-Signatureā€™: ā€˜0x9889FAD4DB79deC094264De686b35CB557C7BD37:0xf463a4253957c9859af89bd1db99bab1e6c11e774ad18bb04b4bbfd015d2bd950850ccd493e3c5c59560177605d9c1f2bb9953ab98bf96990c8754c6204eb3171cā€™, ā€˜Content-Typeā€™: ā€˜application/jsonā€™} sent body: ā€˜{ā€œjsonrpcā€: ā€œ2.0ā€, ā€œidā€: ā€œgUS_5BvR2ulyQā€, ā€œmethodā€: ā€œflashbots_getUserStatsā€, ā€œparamsā€: [{ā€œblockNumberā€: ā€œ0xec2810ā€}]}ā€™

response: {ā€˜errorā€™: {ā€˜codeā€™: -32601, ā€˜messageā€™: ā€œMethod ā€˜flashbots_getUserStatsā€™ is not supported.ā€}, ā€˜idā€™: ā€˜gUS_5BvR2ulyQā€™, ā€˜jsonrpcā€™: ā€˜2.0ā€™}

Additional context 2 weeks ago flashbots_getUserStats worked this way. Has there anything changed?