Ship fax in hours,
not weeks.
The only fax API with AI diagnostics built in. FaxDr tells you exactly why a fax failed — carrier mismatch, T.38 rejection, SIP timeout — before your customer ever calls support.
$ curl -X POST api.faxdr.io/v1/send \ -H "X-FaxDr-Api-Key: faxdr_sk_live_..." -d '{"to": "+16165551234", "pdf_url": "https://..."}' # → { "fax_id": "fx_9k2m...", "status": "queued" }
$ curl api.faxdr.io/v1/faxes/ fx_9k2m/diagnose # → { "root_cause": "T.38 rejected", "fix": "Use G.711 passthrough", "confidence": 0.94 }
"We spent 3 hours on a 4-way conference call with AT&T, the receiver's IT team, and their carrier. Verdict: inconclusive." — That's the status quo FaxDr replaces.
FaxDr tries 4 different carrier routes in 2 minutes, delivers the fax, and hands you a diagnostic package showing exactly which hop was broken. No hold music required.
How It Works
Three steps to production fax
Provision
Get a dedicated fax number in seconds. Search by state and city, provision with one API call.
Send & Receive
Send PDFs via API, receive inbound faxes via webhook. Real-time status updates for every page.
AI Diagnoses
When faxes fail, Gemini AI analyzes the SIP trace and tells you exactly why — carrier mismatch, codec rejection, T.38 negotiation failure.
Features
Everything you need to ship fax
Production-grade infrastructure so you can focus on your product, not your fax stack.
AI-Powered Diagnostics
Gemini 2.5 Flash analyzes telecom traces in seconds. Get root cause analysis, not just error codes.
Sub-50ms Webhook Ingestion
Decoupled Pub/Sub architecture ensures 100% webhook resilience. Never miss an inbound fax.
Send & Receive API
One API to send PDFs, receive inbound faxes, and track delivery status. E.164 numbers, any carrier.
Outbound Webhooks
Real-time push notifications with HMAC-SHA256 signatures. Stripe-style verification.
Usage & Billing API
Metered billing via Stripe. Track pages, overages, and invoices programmatically.
Number Management
Search, provision, release, and reclaim fax numbers via API. 30-day grace period on releases.
Multi-Carrier Route Discovery
GPS for fax. We find the detour.
When a fax fails between two carriers, the telecom route is blocked — like road construction with no detour sign. FaxDr tries different carrier routes until one gets through, then tells you exactly which road was blocked and why.
Without FaxDr
3-4 hours. Verdict: “inconclusive.”
- 1Fax fails. Staff notices hours later — or when the receiving clinic calls asking "where's the referral?"
- 2You open a ticket with your fax provider. Generic error: "Communication Error."
- 3You call AT&T. 45 minutes on hold. They say "it's the receiving carrier."
- 4Spectrum says "it's AT&T's problem." The blame game begins.
- 5You get the fax software vendor on the phone. They say "it's a carrier issue."
- 64-way conference call: AT&T, receiver's IT, their carrier, software vendor. Everyone points fingers.
Result
3-4 hours of engineer time burned. Verdict: “We don't know.” Meanwhile, every fax to that destination has been failing silently.
With FaxDr Relay
~2 minutes. Fax delivered. Root cause found.
AI Diagnostic Package
Root cause: AT&T's intermediate gateway is stripping T.38 headers on routes to Spectrum. All pcaps attached. Working route: Lumen → Spectrum. Confidence: 96%.
3-4 hrs
Traditional troubleshooting time
~2 min
FaxDr route discovery + delivery
$680+
Cost per incident (engineer time)
$0
Engineer hours with FaxDr Relay
Every attempt is a diagnostic.
Each relay attempt captures a full SIP trace and pcap. The AI analyzes all of them together — triangulating the exact point of failure from multiple carrier vantage points. Something no single-carrier provider can do.
Carrier Lookup
Instantly identifies the destination's carrier and line type. FaxDr knows which routes historically work for AT&T → Spectrum, Comcast → Lumen, and thousands of other combinations.
AI Root Cause Analysis
Gemini 2.5 Flash analyzes the SIP traces across all relay attempts. Root cause in plain English — not “lineError: 53” but “T.38 re-INVITE rejected at hop 3.”
Diagnostic Package
Full report with all pcaps, SIP traces, AI analysis, and the recommended permanent fix. Delivered via webhook and viewable in the portal. Verify independently if you want.
Route Intelligence
Every fax builds a smarter route table. Over time, FaxDr predicts which carrier route will succeed before trying — skipping known-bad paths entirely. It gets smarter with every fax.
Use Cases
Built for your stack
Whether you're wiring up an EHR, automating a pharmacy queue, or consolidating fax servers across a clinic portfolio — FaxDr has an integration pattern for you.
Your EHR handles data.
FaxDr handles the fax.
The problem
HL7/FHIR pipelines move in real time. Referrals that arrive by fax sit in a queue. Staff manually sort, route, and re-enter data — creating delays, errors, and missed appointments.
The FaxDr solution
FaxDr webhooks fire in under 50ms. Wire inbound referral faxes directly into your HL7 ADT feed or FHIR DocumentReference workflow. No polling, no queues, no manual sorting.
- < 50ms webhook delivery
- HL7 v2 & FHIR R4 compatible
- Inbound OCR available via webhook
# Receive a referral fax and push to your FHIR endpoint
@app.post("/webhooks/faxdr")
def handle_inbound_fax(event: FaxEvent):
if event.type == "fax.received":
# Signed URL to download PDF — never stores PHI raw
pdf_url = event.data["pdf_signed_url"]
# Push to your EHR intake pipeline
fhir_client.create_document_reference(
content_url=pdf_url,
category="referral",
patient_id=extract_patient_id(pdf_url)
)Pricing
Simple, transparent pricing
Pricing below reflects our Q3 2026 launch rates. Join the waitlist for early access — founding members get 3 months free.
Growth
- ✓5,000 pages included
- ✓$0.04/page thereafter
- ✓AI failure diagnostics
- ✓Outbound webhooks (HMAC)
- ✓REST API + SDKs
- ✓Community support
Founding members get 3 months free
Enterprise
- ✓20,000+ pages included
- ✓Everything in Growth
- ✓Signed BAA for HIPAA
- ✓Custom data retention
- ✓SLA guarantee (99.95%)
- ✓Dedicated Slack + 4h SLA
BAA on Enterprise launch · Q3 2026
Pricing subject to change before launch. Fax PDFs auto-delete after 48h.
Security
Built for healthcare compliance
HIPAA Ready
Signed BAA available. PHI encrypted at rest and in transit.
SOC II Architecture
Immutable audit trails, timing-safe auth, zero PHI in logs.
48-Hour Auto-Delete
Fax PDFs auto-purge from storage. Private bucket, signed URLs only.
Ed25519 Webhooks
Every inbound event cryptographically verified. 5-minute replay window.
FAQ
Everything you need to know
HIPAA buyers have tough questions. We have direct answers.
Yes. Enterprise plan customers receive a signed BAA automatically during onboarding. BAA is available within 24 hours of upgrade. Our BAA covers all data processing activities and meets HIPAA Subpart C requirements.
Fax PDFs are stored in a private GCS bucket with signed-URL-only access and auto-purge after 48 hours. We never log PHI in application or observability pipelines. Storage region: us-central1 (Iowa, USA). All data at rest is AES-256 encrypted.
Every failed fax returns a detailed error code plus AI-generated root cause analysis via the /diagnose endpoint. You'll get the exact failure mode (T.38 negotiation, carrier timeout, codec rejection) and a specific recommended fix. You can retry immediately via API or configure auto-retry logic in your webhook handler.
99.95% monthly uptime SLA with financial credits for violations. You get a dedicated Slack channel and a 4-hour response time for P1 incidents. We publish a live status page at status.faxdr.io.
Number porting is available on the Enterprise plan. We support all major US carriers. Provisioning new numbers takes under 30 seconds via API — search by area code, state, or city prefix.
Our architecture follows SOC 2 Type II principles: immutable audit trails, timing-safe authentication, and zero PHI in observability pipelines. We are actively pursuing formal SOC 2 Type II certification, expected Q3 2026. A security architecture review is available on request for Enterprise prospects.
Three key differences: (1) AI diagnostics — we're the only fax API that tells you WHY a fax failed and how to fix it, not just that it did. (2) Developer-first design — Stripe-style HMAC-signed webhooks, typed SDKs, OpenAPI spec, and an MCP server for AI tooling. (3) HIPAA-native architecture — compliance is built into the data model, not bolted on after.
Growth plan ($299/mo): $0.04/page after 5,000 pages. Enterprise plan ($999/mo): custom overage rates negotiated at contract time. You'll receive an automated alert at 80% of your monthly page limit so you're never surprised.
Still have questions?
Talk to our team →