Products
Three building blocks for physical mail.
Compose letters, certified mail, and address verification into whatever your workflow needs — through one API and one dashboard.
01
Letters
In the dashboard and the API
Black-and-white or color, single or multi-page. #10 or flat envelopes, simplex or duplex, address window or printed.
- B&W or full color, simplex or duplex
- #10 and flat envelope formats
- Address window or printed recipient block
POST /v1/letters
POST /v1/letters
{
"to": "Acme Corp, 500 Main St, Austin, TX 78701",
"from": "Your Co, 1 Market St, SF, CA 94105",
"file": "@notice.pdf",
"color": false,
"double_sided": true
}02
Certified Mail
In the dashboard and the API
USPS Certified with electronic return receipt. Tracking and proof of delivery on every piece — built for legal and compliance workflows.
- USPS Certified with electronic return receipt
- Tracking number and proof of delivery
- Timestamped status history for your audit trail
POST /v1/letters
POST /v1/letters
{
"to": "Acme Corp, 500 Main St, Austin, TX 78701",
"from": "Your Co, 1 Market St, SF, CA 94105",
"file": "@notice.pdf",
"certified": true,
"return_receipt": true
}03
Address Verification
In the dashboard and the API
CASS-certified validation, standardization, and NCOA move-update run on every send — so mail lands instead of bouncing.
- CASS-certified validation and standardization
- NCOA move-update on every send
- Deliverability flags before you spend postage
POST /v1/addresses/verify
POST /v1/addresses/verify
{
"address": "500 Main St, Austin, TX 78701"
}
200 OK
{ "deliverable": true, "standardized": "500 MAIN ST, AUSTIN TX 78701-3447" }