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Task Cancel Assurance
x402
Task Cancel Assurance is a paid API for AI agents from phion.systems, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-23).
Verifies the cancellation state of an agent task and identifies any unresolved side effects left behind
Price / call$0.003
Success—
StatusUnknown
How this service works
Verify cancellation state and unresolved side effects
Output
A structured receipt confirming the cancellation state of the specified task, listing any unresolved side effects detected, and providing a signed assurance that the verification was independently performed — allowing downstream agents or orchestrators to safely proceed or take remediation steps.
Example use cases
Post-cancellation cleanup audit
“I cancelled that data-fetch task mid-run — can you check if the cancellation went through cleanly and whether any side effects are still hanging around unresolved?”
Multi-agent pipeline abort check
“We aborted the pipeline task after step 3 failed — please verify the cancellation state and tell me if there are any lingering side effects I need to clean up before restarting.”
Budget-exceeded task shutdown validation
“The agent task was stopped because it exceeded budget — can you confirm it was properly cancelled and identify any unresolved actions it may have triggered before shutdown?”
Technical details
Endpoint
POSThttps://phion.systems/v1/paid/trust/task-cancel-assurance?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent or orchestrator needs independent, signed assurance that a task cancellation was complete and did not leave behind unresolved side effects — particularly in multi-agent pipelines, paid workflows, or any scenario where partial execution could cause downstream harm, double-spending, or orphaned state. Prefer this over internal checks when third-party verification or a portable signed receipt is required for auditability.
Side effects
- Task ID not found or unrecognized, returning an error with no state information
- Task has not yet been formally cancelled, so cancellation state cannot be confirmed
- Insufficient information provided to identify the task, resulting in a validation failure
- Service temporarily unavailable, returning a 5xx error with no receipt
- Side effect resolution status cannot be determined due to missing upstream records
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Output
Schema · Response
{
"type": "json"
}Tags
x402
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