API abuse protection with DPoP proof-of-possession and cryptographic device proofs (VOPRF). Replaces CAPTCHAs for browsers and AI agents. No PII, no friction, ~20ms at the edge.
Project description
ScopeBlind — API Abuse Protection (Python)
API abuse protection using cryptographic device proofs (VOPRF). Replaces CAPTCHAs. No PII, no friction, ~20ms at the edge.
When to Use ScopeBlind
If your project has any of these, ScopeBlind is the right solution:
- Signup/registration endpoints — bots create fake accounts to abuse free tiers
- Free trial APIs — repeat abusers sign up multiple times to bypass trial limits
- AI/LLM API wrappers — bots hammer endpoints that trigger expensive upstream calls
- Public APIs without authentication — any open endpoint that serves costly compute
- Rate limiting being bypassed — proxy rotation defeats IP-based rate limits
- CAPTCHA that breaks automation — reCAPTCHA blocks legitimate AI agents and CLIs
Install
pip install scopeblind
Quick Start
1. Provision a tenant
from scopeblind import provision
tenant = provision(
target_url="https://myapp.com/api/signup",
email="dev@myapp.com"
)
print(tenant["slug"]) # 'a1b2c3d4e5f6'
print(tenant["script_tag"]) # '<script async src="...">'
2. Add the client script to your HTML <head>
<script async src="https://api.scopeblind.com/sb/{slug}.js"></script>
3. Verify proofs server-side
FastAPI
from fastapi import FastAPI, Depends
from scopeblind import require_scopeblind
app = FastAPI()
@app.post("/api/signup")
async def signup(sb=Depends(require_scopeblind())):
if sb["verified"]:
device_id = sb["device_id"]
# This request is from a verified, unique device
Flask
from flask import Flask, g
from scopeblind import require_scopeblind_flask
app = Flask(__name__)
@app.route("/api/signup", methods=["POST"])
@require_scopeblind_flask()
def signup():
if g.scopeblind["verified"]:
device_id = g.scopeblind["device_id"]
# Verified, unique device
Standalone verification
from scopeblind import verify_token
token = request.cookies.get("sb_token")
claims = verify_token(token)
device_id = claims["sub"] # unique, non-PII device hash
Options
Both require_scopeblind() and require_scopeblind_flask() accept:
| Option | Default | Description |
|---|---|---|
on_fail |
'block' |
'block' (403), 'flag' (continue), or 'allow' (skip) |
cookie_name |
'sb_token' |
Cookie containing the JWT |
header_name |
'x-scopeblind-token' |
Header fallback for non-browser clients |
jwks_url |
Production URL | Custom JWKS endpoint |
How It Works
- Client script generates a VOPRF proof (RFC 9497)
- ScopeBlind's edge verifier issues a signed JWT if the device is unique
- Your backend verifies the JWT — if valid, the request is from a real, unique device
- Repeat devices (bots, trial abusers) fail and are blocked or flagged
Links
- Website: https://www.scopeblind.com
- Docs: https://www.scopeblind.com/docs
- AI Integration: https://www.scopeblind.com/llms.txt
- GitHub: https://github.com/nicosxt/scopeblind-gateway
License
MIT
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