A personhood check by U.S. mail

We mail yourusers POST cards.

POST Request mails a single-use QR code to a U.S. address. When your user scans it and confirms, a signed webhook tells you they (probably) aren’t an AI (for now).

Run the test loop Read the API reference

Rates from: $0.75 / attempt
Standard schedule: 5–7 business days
Recipient names: Never collected

What your users see

A card. A scan. A stamp.

01 / Delivery
A POST card arrives
It carries a private, single-use QR code on the message side.
02 / Verification
They scan and confirm
The QR code opens a short verification page. Email-bound cards also ask for the code sent to their account.
03 / Return
Signed and returned
They see the green VERIFIED postmark. Your server receives the signed webhook.

POST RequestReturn receipt

FORM PR-01 / COPY B

Delivery record

Card delivered
Credential opened
Verification completed

Card: ...7F3A
Binding: Email OTP
Event: verification.verified

COMPLETE / SIGNED EVENT RETURNED

A completed card fires verification.verified

The delivery loop

One request. One physical checkpoint.

One API call sends the card. One webhook tells you it was received and confirmed.

01
Submit an address
Your server sends a domestic mailing address. We validate it, debit your postage balance, and create a single-use credential. Recipient names are not accepted.
POST /v1/verifications
02
We print and mail
We print the card and hand it to the Postal Service. The QR code prints on the private side, never the side that shows the address.
PRINTED -> IN TRANSIT
03
Your user closes the loop
They scan the card and confirm receipt. Email-bound cards also require the account code. We sign a webhook when complete.
verification.verified

Verification contract

What closing the loop proves.

Read the full attestation

Attested

A person receiving mail at that address completed this exact card. With email binding: the same party also controls the account’s email.

Not attested

Legal identity, one-human uniqueness, permanent residence, or continued control of the address after verification.

Fraud resistance

Make fake accounts expensive.

Every attempt now needs a deliverable address, postage, and several days.

01 / Delivery

A physical step for every attempt

Each verification requires a card sent through the U.S. mail.

02 / Optional binding

Pair the card with email

If you enable email binding, your user confirms with the card and a code sent to their account.

03 / Single use

One card, one completion

The route expires when the verification is complete. The same card cannot be used for another account.

Records schedule

Every record has a schedule.

The Postal Service does not keep a copy of your mail. Neither do we. Addresses stay encrypted for 90 days after a verification ends, then move to a vault with no link to any account. The verification keeps a redacted line and a fingerprint — enough to spot reuse, not to recover the address.

Read the data lifecycle

Record retention / production mode
Record	Plaintext window	After purge
Mailing address (encrypted)	Terminal state + 90 days	Moves to delinked vault
Delinked address vault	18 months	Encrypted / week-level dates
Redacted address + fingerprint	Permanent	Retained with verification
Email (encrypted)	Terminal state + 90 days	Hash + mask remain
External ID + metadata	Permanent	Customer supplied
Recipient name	Never collected	None
QR credential	Plaintext never stored	Hash only

Domestic rates / July 2026

Postage, not seats.

Prepay a dollar balance. Each mailpiece debits its rate. Credits do not expire.

Class	Format and schedule	Rate
Bulk	Postcard / batched weekly / 2–3 weeks	$0.75
Standard Default	Postcard / mailed next day / 5–7 business days	$1.25
Certified	Sealed letter / mailed next day	$3.00

Credits never expire.Postage is non-refundable after print.Bulk is for communities worth waiting for.

Certified class uses an unbranded, security-tinted envelope. No account information is visible in transit.

Integration

A request now. Proof later.

Test mode completes the same loop without buying postage. Move to a live key when the webhook is wired.

1 / Create verificationHTTP

curl https://postrequest.dev/api/v1/verifications \
  -H "Authorization: Bearer pr_live_..." \
  -d '{
    "address": {
      "line1": "1600 EXAMPLE ST",
      "city": "SEATTLE",
      "state": "WA",
      "zip": "98101"
    },
    "class": "standard",
    "external_id": "user_8123"
  }'

2 / Receive proofWEBHOOK

{
  "type": "verification.verified",
  "id": "01JZ3NVJ4M8Q",
  "external_id": "user_8123",
  "status": "verified",
  "verified_at": "2026-07-17T15:02:11Z",
  "binding": "email_otp"
}

Test mode uses simulated mail

Send the first card.

Open the dashboard Documentation

We mail yourusers POST cards.

A card. A scan. A stamp.

A POST card arrives

They scan and confirm

Signed and returned