Proof Holdings vs Infobip
Infobip is enterprise CPaaS done properly — omnichannel 2FA with automatic SMS→WhatsApp→RCS→Voice failover and global carrier reach. But failover is a fix for a problem Reverse OTP doesn't have — and every fallback attempt bills again, on top of a monthly base and per-country rates.
Proof doesn't need delivery failover: the user sends the message, so there is no code to lose on the way. From €0.0079 a proof (300 free a month), with a signed token back. That's the enterprise reliability story in one API call.
One API · One key
One key does what a stack of vendors does
Every provider on this page delivers codes to phones. Proof is a single API — the same reverse-OTP flow also covers email and domains, and every verification mints a signed, offline-verifiable ES256 token for each of these:
Same price · Any asset
The same price for every asset — phone, email, and domain today, with wallet and social coming soon. No per-seat or per-MAU fees — the meters that make rivals' bills jump.
- Free every month
- 300 proofs
- Pay as you go
- €0.03 / proof
- At volume
- €0.0079 / proof on the €79 plan
Feature Comparison
Swipe to compare →
| Feature | Proof Holdings | Infobip |
|---|---|---|
| Phone verification | Telegram, WhatsApp, SMS | SMS, WhatsApp, RCS, Voice |
| Email verification | Magic Link, OTP | OTP |
| Domain verification | DNS TXT, HTTP, Admin Email, Auto-Verify | No |
| Wallet verification | Coming soon (8 chains planned) | No |
| Social verification | Coming soon (12+ platforms planned) | No |
| Automatic failover | Configurable per channel | Automatic cross-channel failover |
| Reverse OTP | Yes | No |
| Cryptographic proof tokens | ES256 JWT, offline-verifiable | No |
| Fraud detection | Inherent (user-initiated) | Infobip Signals (AIT detection) |
| HITL approvals | Telegram/WhatsApp with proof tokens | No |
| MCP server | 167 tools | No |
| No code in transit to intercept or phish | Yes | No |
Pricing
Starting price
Proof Holdings
From €0.0079/proof (any asset, any country)
Infobip
Pay-as-you-go, varies by country (e.g. €0.04/SMS Lithuania, €0.08/SMS Netherlands)
International SMS cost
Proof Holdings
Included in the proof price (from €0.0079)
Infobip
€0.04-0.10+ per SMS depending on country (e.g. €0.04 Lithuania, €0.08 Netherlands)
Free tier
Proof Holdings
300 proofs/month
Infobip
No free tier (enterprise-oriented)
Asset coverage
Proof Holdings
Phone, email, domain (wallet & social soon)
Infobip
Phone and email (omnichannel delivery)
The Hidden Cost: Country-Variable Pricing
Infobip starts at approximately $41/month as a base, then adds usage-based channel fees that vary dramatically by destination country. SMS costs range from $0.05 to $0.50+ depending on where your users are.
Their omnichannel failover (SMS → WhatsApp → RCS → Voice) means you pay different rates per channel per country. If SMS fails and falls over to voice, you pay the voice rate. Total cost per verification is unpredictable.
Proof Holdings charges from €0.0079 per proof — the same in any country, any asset type, any channel. No monthly base fee, no country surcharges.
Omnichannel Failover
Infobip's strength is automatic failover across channels. If SMS fails, it tries WhatsApp. If WhatsApp fails, it tries Voice. This improves delivery rates for traditional OTP.
Proof Holdings takes a different approach: Reverse OTP removes the need for delivery failover. Since the user initiates the message, no code has to reach the user, so there is no code delivery to retry on another channel.
Failover sounds sophisticated but it's solving a problem that Reverse OTP doesn't have. Each failover attempt also costs money — compounding the per-verification cost.
Security
Infobip's SMS, WhatsApp, and voice channels are all vulnerable to SIM-swap attacks at the phone number level. Their Signals product detects artificially inflated traffic but doesn't address SIM-swap.
Reverse OTP sends no code to intercept or phish, and on Telegram and WhatsApp a SIM swap alone is not enough — the attacker must also take over the messaging account, which two-step verification blocks when the user has turned it on. Every verification produces an ES256 JWT proof token verifiable offline.
When to use Infobip
- You're an enterprise needing a full CPaaS platform (messaging, voice, chatbots, customer engagement)
- You need Infobip's carrier-level delivery infrastructure and global reach
- Automatic cross-channel failover is a hard requirement
- You're already in the Infobip ecosystem
When to use Proof Holdings
- You need to verify more than phone and email (domain today; wallet & social soon)
- You want predictable pricing without country surcharges or monthly base fees
- You want no codes lost in delivery, without needing failover
- You want cryptographic proof tokens for every verification
- You need HITL approvals for AI agents
- You're a startup or growth-stage company (no $41/month minimum)
Frequently Asked Questions
Ready to try Proof Holdings?
300 free proofs per month. No credit card required.
Building with an AI agent? The 167-tool MCP server and test mode let an agent run a real verification right now — machine quickstart in llms-full.txt.