  We bootstrap the Veneziano superstring amplitude in 10 dimensions from the
bottom-up. Starting with the most general maximally supersymmetric Yang-Mills
EFT, we input information about the lowest-lying massive states, which we
assume contribute via tree-level exchanges to the 4-point amplitude. We show
the following: (1) if there is only a single state at the lowest mass, it must
be a scalar. (2) Assuming a string-inspired gap between the mass of this scalar
and any other massive states, the allowed region of Wilson coefficients has a
new sharp corner where the Veneziano amplitude is located. (3) Upon fixing the
next massive state to be a vector, the EFT bounds have a one-parameter family
of corners; these would correspond to models with linear Regge trajectories of
varying slopes, one of which is the open superstring. (4) When the ratio
between the massive scalar coupling and the $\text{tr}\, F^4$ coefficient is
fixed to its string value, the spin and mass of the second massive state is
determined by the bootstrap and the Veneziano amplitude is isolated on a small
island in parameter space. Finally, we compare with other recent bootstraps
approaches, both the pion model and imposing Regge-inspired maximal spin
constraints.
