We present a procedure associated with nonlinear wavelet methods
that provides adaptive confidence intervals around $f (x_0)$, in either a white
noise model or a regression setting. A suitable modification in the truncation
rule for wavelets allows construction of confidence intervals that achieve
optimal coverage accuracy up to a logarithmic factor. The procedure does not
require knowledge of the regularity of the unknown function $f$; it is also
efficient for functions with a low degree of regularity.