AgentiSend blog https://agentisend.com/blog 2026-09-28T00:00:00Z Why every API key is created with a budget https://agentisend.com/blog/why-every-api-key-is-created-with-a-budget 2026-09-28T00:00:00Z 2026-09-28T00:00:00Z AgentiSend team Every new AgentiSend API key starts with a send budget equal to the plan inclusion. The key cannot raise it, and sending stops when the budget is used.