SMS API
Texts your product can send, with a balance that refills itself.
TxtNexus is a prepaid SMS API. Create an account, save a card, and send with a bearer key. Delivery receipts come back on a signed webhook. US application-to-person traffic goes through 10DLC.
POST /v1/messages
curl https://api.txtnexus.com/v1/messages \
-H "Authorization: Bearer live_sk_..." \
-H "Content-Type: application/json" \
-d '{"to":"+15557654321","from":"+15551234567","body":"Your technician is on the way."}'Platform
Everything between your app and the handset
One send call
To, from, and body. You get a message id, a segment count, and a price.
Prepaid wallet
Sends spend balance. A zero balance returns 402 instead of a surprise invoice.
Auto top-up
When the balance drops under your threshold, the card on file refills it.
Signed webhooks
Delivery and inbound texts hit your URL. You verify them with the secret from signup.
10DLC
Register the brand, the campaign, and the number before US A2P traffic.
Logs
Search a number and see whether the carrier delivered or failed the text.
Built for software that already has the customer
You are not buying a list. You are sending a text the person already agreed to receive.