> For the complete documentation index, see [llms.txt](https://docs.term.finance/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.term.finance/terminal-1-execution/concepts/routes-and-atomic-execution.md). # Routes & atomic execution A route is an ordered bundle of dependent actions executed as a single transaction where possible (e.g., swap → repay → settle). Routes are atomic: either every step completes and the route succeeds, or the transaction reverts and no state changes are applied. Terminal 1 builds routes by selecting compatible venues and amounts, then constrains execution with explicit minimums/maximums so the route fails safely if prices, balances, allowances, or market liquidity change. ### Execution environments Terminal 1 can express a route in two ways: * **Atomic execution (single transaction):** the full route executes in one transaction and either completes in full or reverts. This is the primary execution path for EOAs and for workflows that require flash loans. * **Safe mode (native Safe batch):** for Safe wallets, many routes can be expressed as a native Safe batched transaction generated via the Safe API. This makes each step visible in the Safe interface prior to execution. Routes that require flash loans cannot be expressed as a native Safe batch. ### When routes revert * A required approval/permit is missing or too small. * Output is below the minimum after fees/slippage (“output insufficient”). * A venue quote is stale or liquidity moved before inclusion. * A route constraint fails (price impact, buffer, deadline, etc.). ### What to review before signing * Input/output tokens and amounts. * Venue sequence (which protocols/aggregators are used). * Min/Max constraints (slippage + buffers). * Approval scope (token + spending cap). ### What atomic execution does not guarantee * Guarantees: atomicity (all-or-nothing) and bounded authorization where supported. * Doesn’t guarantee: a specific price or fill if market conditions change; the route will revert instead.