The infrastructure API behind AI SDRs and outbound platforms
Provision domains, create mailboxes in bulk, rotate identities, trigger exports, and stream deliverability events — over REST, webhooks, or natively from any MCP client. Included free on every account, not gated behind a $299 plan.
curl -X POST https://api.clayinbox.com/v1/mailboxes/bulk \
-H "Authorization: Bearer cib_live_..." \
-H "Content-Type: application/json" \
-d '{
"domain_id": "dom_acme_co",
"count": 10,
"warmup": true
}'70+ endpoints, six categories
- POST /v1/domains
- GET /v1/domains/{id}/dns
- POST /v1/domains/search
- POST /v1/mailboxes/bulk
- PATCH /v1/mailboxes/{id}
- POST /v1/mailboxes/{id}/replace
- POST /v1/identities/generate
- PUT /v1/mailboxes/bulk/profile
- POST /v1/exports
- GET /v1/exports/{id}/status
- targets: instantly | smartlead | lemlist | emailbison
- GET /v1/monitoring/blacklists
- POST /v1/placement-tests
- GET /v1/mailboxes/{id}/health
- mailbox.created
- mailbox.flagged
- mailbox.replaced
- dns.drift_detected
Manage your infrastructure from Claude, Cursor, or any MCP client
CLAYINBOX ships a native Model Context Protocol server exposing the full API as tools. Connect it to Claude or your agent framework and your AI SDR can buy a domain, spin up 25 mailboxes, wait for warmup, and export to Smartlead — autonomously, with scoped permissions and per-tool audit trail.
# Install the MCP server
npx @clayinbox/mcp --api-key cib_...
# Or HTTP Streamable
# https://mcp.clayinbox.com
# Now your agent can:
# - clayinbox.domains.search("acme")
# - clayinbox.mailboxes.bulkCreate(...)
# - clayinbox.exports.toSmartlead(...)Built for three teams
Auto-scale sending capacity with demand. Provision per-tenant, isolate per-customer.
Script client onboarding end-to-end: domain → mailboxes → export to Smartlead in one pipeline.
Embed white-labeled infrastructure via API + the /whitelabel program.