Simple. Transparent.
Built for scale.

Start for free, then scale as your protocol grows. No credit cards. No lock-in. Pay native USDC via any Solana wallet.

SPEC SHEET

Growth$9950k sends included

DeveloperFree1k sends

Growth$9950k sends

Scale$299250k sends

EnterpriseCustom1M+ sends

Channels

All

ZK Receipts

API Keys

∞

Team Space

∞

Uptime SLA

99.9%

99.99%

Support

Base

Standard

Priority

24/7 CSM

Custom DKIM

Nitro TEE

Scalable Protocol Infrastructure

ZK Receipts & Nitro Enclaves
Standard on all tiers.

Base Tier

Email Volume

Volume+100,000

Estimated Overage

$200.00USDC

"Scaling shouldn't be a pricing ambush. Our overage rates are transparent and decrease as you move up tiers."

Your first notification is one install away

Install the SDK, call notify(), and Herald handles encryption, on-chain resolution, and delivery.

$npm i @herald-protocol/sdk