x402email

Pay-per-send email. No API keys. No accounts. One HTTP request.

Powered by x402 protocol

How it works

  1. 1POST your email to /api/send
  2. 2Get back a 402 with payment requirements ($0.02 USDC on Base)
  3. 3Pay and resend — email delivered via AWS SES

Example

POST /api/send
{
  "to": ["alice@example.com"],
  "subject": "Hello from x402",
  "text": "Sent and paid in one HTTP request.",
  "replyTo": "you@example.com"
}
Response
HTTP/1.1 402 Payment Required
PAYMENT-REQUIRED: <base64 payment details>

// Pay with any x402 client, then:

{
  "success": true,
  "messageId": "ses-abc123",
  "from": "relay@x402email.com"
}

Endpoints

EndpointPrice
POST /api/send

Send from relay@x402email.com

$0.02
POST /api/subdomain/buy

Purchase yourname.x402email.com

$5
POST /api/subdomain/send

Send from your subdomain

$0.005
POST /api/subdomain/signers

Add/remove authorized wallets

Free
GET /api/subdomain/status

Check DNS/SES verification

Free
POST /api/inbox/buy

Buy username@x402email.com (30 days)

$1
POST /api/inbox/topup

Extend inbox 30 days

$1
POST /api/inbox/topup/quarter

Extend inbox 90 days (save 17%)

$2.50
POST /api/inbox/topup/year

Extend inbox 365 days (save 34%)

$8
POST /api/inbox/send

Send from your inbox address

$0.005
GET /api/inbox/status

Check inbox status and expiry

Free
POST /api/inbox/update

Change forwarding address

Free
POST /api/inbox/cancel

Cancel inbox and get pro-rata refund

Free

Forwarding inbox

Buy username@x402email.com for $1/month. Emails forwarded to your real address. Send from your inbox address for $0.005/email. Bulk discounts: 90 days for $2.50 (save 17%), 365 days for $8 (save 34%). Anyone can top up any inbox. Cancel anytime for a pro-rata refund.

Custom subdomains

Buy yourname.x402email.com for $5. Send from any address on your subdomain. Add up to 50 authorized wallet signers via SIWX.

Discovery

x402 resource discovery at /.well-known/x402

Agent instructions at /llms.txt