Supplier API
Connect your SMS infrastructure — gateways, SIM banks, phone farms, or an existing API — and receive activation requests from businesses worldwide. Your inventory competes in the same marketplace as every other source: on price, delivery speed, and measured success rate.
The protocol below is decided and under active build. Full request/response documentation
publishes here once it has been exercised end to end — we document what is proven, not what
is planned. To be notified when it opens, create an account
and enable supplier updates.
01
Register
Create a supplier profile and receive credentials for the connector.
02
Authenticate
Every call carries your supplier key. Scoped, revocable, shown once.
03
Publish countries & services
Declare what you can serve, where, and at what price.
04
Return offers
Answer availability queries with live sellable inventory.
05
Rent
Accept an activation request and assign a number from your stock.
06
Deliver SMS
Push received messages the moment they land.
07
Cancel
Release a number when the customer cancels inside the rules.
08
Complete
Confirm a finished activation so settlement can run.
09
Heartbeat
Prove liveness; silent connectors are routed around, not guessed at.
© 2026 SMSMetro, Inc. · smsmetro.com · Customer API docs