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Documentation Index

Fetch the complete documentation index at: https://docs.sendmux.ai/llms.txt

Use this file to discover all available pages before exploring further.

Billing is team-scoped. Sendmux uses the team balance for paid email activity and records purchases, usage, auto top-ups, refunds, and adjustments as transactions.

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Email usage

Sendmux charges email usage from the team balance.
ActivityRate
Standard outgoing mail through your own providers$0.15 / 1,000 emails
Outgoing mail through the managed Amazon SES route$0.25 / 1,000 emails
Accepted inbound mail$0.15 / 1,000 emails
Inbound usage is counted when a message is accepted into a mailbox. Mail rejected by mailbox allow or block rules is not billed. Usage transactions can be grouped, so the transaction table may show one Incoming email usage line for several received messages in a short period.

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Balance

The Billing page shows current balance, purchased amount over the last 30 days, and consumed amount over the last 30 days. If balance is too low, sending requests can fail with insufficient_credits. Top up before retrying.

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Manual top-up

Choose a top-up amount, then complete checkout. Supported amounts are: 
$20, $50, $100, $250, $500, $1,000, $2,500, $5,000
The balance updates after the purchase completes.

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Auto top-up

Auto top-up adds balance when your team drops below a threshold.
SettingOptions
Balance threshold50,50, 100, 200,200, 500
Top-up amount100,100, 200, 500,500, 1,000, $2,000
Monthly limit500,500, 1,000, 2,000,2,000, 5,000, $10,000
Use a monthly limit that covers expected usage but still caps unexpected spend.

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Low-balance alerts

Low-balance alerts email you when team balance drops below the selected threshold. 
$5, $10, $25, $50, $100, $250
Alerts are sent at most once every 24 hours for the same team and user.

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Transactions

The transaction table shows balance movements with type, amount, date, and description. Use it to reconcile purchases, auto top-ups, usage, refunds, and manual adjustments.

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API access

Use the Management API to read balance, summary, and transaction history from your own reporting tools.

Management API

Open the generated Billing endpoint reference.

Send by HTTP

Handle insufficient_credits on sending requests.

Team limits

See which limits are separate from balance.

Mailboxes

Use sender rules to reject unwanted inbound mail before it is billed.

API keys

Create keys for billing reporting.