Solution
Block bots draining your free credits.
An AI startup gives away tokens on signup. A scraper rents a thousand residential proxies and burns the budget by lunch. Tellr separates real humans from automation in under 80ms.
{ "verdict": "block", "score": 0.94, "reasons": [ "tls_fingerprint_headless", "webdriver_flag_set" ], "signals": 267}
99.4%
Recall on automated signups during a recent attack.
<80ms
P95 verdict latency at the edge.
267
Signals scored before a single token is spent.
How it works
Three quick steps wired through one single API call.
Score on signup and on the first call.
Hit the check API at account creation. Hit it again before you mint the API key. That gives you two checks running off one signal set.
Tellr fingerprints the runtime.
We use TLS fingerprint, canvas hash, headless detection plus behavior cadence. We can tell a real browser from a bot ring.
Mint keys only for humans.
Block on a verdict score above your threshold. Send borderline accounts to a soft challenge. Mint the rest.
Signals we score
Every dimension covered by every single check.
Automation
91 signals- tls_fingerprint_headless
- webdriver_flag_set
- puppeteer_signature
- playwright_signature
- cdp_runtime_present
Plus 86 more in this group.
Network
86 signals- residential_proxy_class
- asn_proxy_known
- ip_velocity_5m
- tor_exit_node
- datacenter_range_match
Plus 81 more in this group.
Behavior
90 signals- no_pointer_events
- instant_form_fill
- typing_entropy_low
- mouse_path_synthetic
- time_to_signup_under_2s
Plus 85 more in this group.
267 signals in total. Every one of them computed by Tellr and every one of them in the response.
What teams get
Built for the people who actually ship the product.
Built for AI signup flows.
We see bots before they spend a token. Your free tier survives launch week.
Real humans pass straight through.
Real users see no challenge. The verdict stays invisible while the signal capture runs silently.
Replay the attack later.
When a wave hits, you see the exact cluster along with the exact ASN plus the exact fingerprint. The fix is data, not guesswork.
Thresholds live per project.
Strict on credit minting and loose on read only. You own the policy while Tellr owns the signals.
Pricing
Pay per request. No seats. No feature tiers.
One signal set. One verdict format. Pick a plan by how much signup traffic you protect each month.
Starter
For early stage products validating signup quality on the way to product market fit.
50 checks per week included
Get started- 1,000 check API calls each month
- 267 signals on every verdict
- 7 day signal retention window
Starter includes
- Browser SDK plus REST API access
- Threat intel for Tor, cloud plus disposable email
- One project paired with one environment
Pro
Most popularFor growing SaaS teams running real trial flows day in and day out.
2,500 checks per month included
Get started- 2,500 check API calls each month
- Rules engine paired with shadow mode
- 30 day retention with webhooks included
Everything in Starter, plus
- Custom rules tested in shadow mode
- Signed webhooks streaming to billing or SIEM
- Up to five projects with role based access
Business
For scaled products that want dedicated infrastructure plus a real SLA on every verdict.
10,000 checks per month included
Get started- 10,000 check API calls each month
- Dedicated infrastructure plus SLA
- 12 month retention, bring your own storage
Everything in Pro, plus
- Single tenant deployment option
- SOC2 Type II report alongside a custom DPA
- Named CSM with 24/7 incident response
For custom enterprise solutions contact us now so we can scope volume, deployment plus SLA against your traffic.
Wire it up just once and sleep right through the next attack.
Free for 50 checks a week on the Starter plan, upgrade only when you need more.