Attempted API with flask and sampled

sampled_api.py

from flask import Flask,request, jsonify
from sampled import sampled
import numpy as np
import pymc3 as pm
import theano.tensor as tt
import pandas as pd

app = Flask(__name__)

@sampled
def student():
    difficulty = pm.Beta('difficulty', alpha=5, beta=5)
    intelligence = pm.Beta('intelligence', alpha=5, beta=5)
    SAT = pm.Beta('SAT', alpha=20 * intelligence, beta=20 * (1 - intelligence))
    grade_avg = 0.5 + 0.5 * tt.sqrt((1 - difficulty) * intelligence)
    grade = pm.Beta('grade', alpha=20 * grade_avg, beta=20 * (1 - grade_avg))
    recommendation = pm.Binomial('recommendation', n=1, p=0.7 * grade)

@app.route('/predict', methods=['POST'])
def predict():
    json_ = request.json
    with student(SAT=json_):
        prior = pm.sample(draws=1000, tune=500)
    return jsonify({'recommendation': prior.get_values('recommendation').mean()})

if (__name__=='__main__'):
    app.run(port=5808)

For some reason this doesn't work - I've tried testing it with
curl -i -X POST -H "Content-Type: application/json" -d "{"SAT":"0.5"}" http://localhost:5808/predict

It looks like the data is probably malformed (too many double quotes!) -d '{"SAT": 0.5}' is what I would try