ValidateTopologyPrecision — Returns non-precise vertices in the topology.
geometry ValidateTopologyPrecision(name  toponame, geometry bbox, float8 gridSize);
Returns all vertices that are not rounded to the topology or given gridSize as a puntal geometry, optionally limiting the check to the area specified by the bbox parameter. 
Availability: 3.6.0
SELECT ST_AsEWKT(g) FROM
 topology.ValidateTopologyPrecision(
    'city_data',
    gridSize =
> 2,
    bbox =
> ST_MakeEnvelope(0,0,20,20)
) g;
      st_asewkt
----------------------
 MULTIPOINT(9 6,9 14)
(1 row)