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Loop Gate – Agentic Loop Continuation Decision
x402
Loop Gate – Agentic Loop Continuation Decision is a paid API for AI agents from agent402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-30).
Decides whether an agentic loop should continue iterating, stop, or escalate, based on goal progress, budget, iteration count, history, and constraints.
Price / call$0.001
Success—
StatusUnknown
How this service works
Should the loop run another iteration? Send the goal, the iteration that just finished (lastOutput, iteration), and optionally maxIterations, a budget { spentUsd, maxUsd }, the history of earlier iterations (up to 20 of { iteration, summary }, oldest first) and constraints; get back decision (continue, stop or escalate), reason, confidence (0 to 1), the checks that produced it (goalMet, budgetExceeded, iterationsExhausted, repeating, stuck, constraintBreached) and nextStep (iterate.
Output
Returns a JSON object with: decision (one of 'continue', 'stop', or 'escalate'), a human-readable reason string, a confidence score between 0 and 1, a nextStep suggestion, and a checks object containing boolean flags for goalMet, budgetExceeded, iterationsExhausted, repeating, stuck, and constraintBreached.
Example use cases
Budget-aware research agent loop
“I'm running a research agent that's trying to 'compile a list of 20 venture-backed AI startups from 2024'. It just finished iteration 5 out of a max of 10, found 14 startups so far, and has spent $0.07 of my $0.15 budget. Should it keep going or stop?”
Detecting a stuck code-generation loop
“My coding agent is on iteration 8 trying to 'fix a type error in the TypeScript codebase' and has produced almost identical output for the last 3 iterations. I have a constraint that it must not modify test files. Check if it's stuck and tell me whether to continue, stop, or escalate.”
Constraint-checking before final loop iteration
“My data-cleaning agent just finished iteration 4 out of 5 working toward 'produce a fully deduplicated customer CSV with no nulls in required fields'. The last output still has 3 null email addresses. My constraints are no deletions of records and max $0.05 spend — $0.038 used so far. Should it run one more iteration?”
Technical details
Endpoint
POSThttps://agent402.tools/api/loop-gate?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a neutral, stateless arbitration layer to decide loop continuation in an autonomous agent workflow — especially when you want transparent reasoning with per-check flags (stuck, repeating, constraintBreached) rather than implementing custom termination logic yourself. Ideal for multi-iteration agents that need budget guardrails, goal-completion detection, and escalation paths built in.
Side effects
- Missing required fields (goal or iteration) returns a 400 validation error
- Goal string too vague for meaningful goalMet evaluation, resulting in low-confidence decisions
- History array exceeding 20 items may be truncated or rejected
- Budget values inconsistent (spentUsd > maxUsd on first iteration) may yield immediate budgetExceeded=true
- Payment failure (x402 protocol) returns 402 Payment Required before processing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| goal | string | |
| budget | object | |
| history | array | |
| iteration | integer | |
| lastOutput | — | |
| constraints | array | |
| maxIterations | integer |
Tags
x402
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