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Agent Session Continuity
x402
Agent Session Continuity is a paid API for AI agents from phion.systems, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-20).
Verifies hash-linked session identity and monotonic sequence continuity for AI agent sessions
Price / call$0.003
Success—
StatusUnknown
How this service works
Verify hash-linked session identity and monotonic sequence continuity
Output
A verification result indicating whether the session's hash linkage is valid and the sequence number is monotonically continuous, including any detected anomalies such as gaps, reversals, or hash mismatches in the session chain.
Example use cases
Pre-payment session integrity check
“Before authorizing this payment, check that our agent session chain is intact — verify the current session hash is correctly linked to the previous one and that the sequence number is monotonically increasing with no gaps.”
Long-running task session audit
“We're on step 12 of this multi-turn workflow — can you verify that the session identity and message sequence are still continuous and unbroken from the start?”
Detecting session replay attacks
“I want to make sure no one has replayed or reordered messages in our agent session — validate the hash linkage and confirm the sequence hasn't jumped backward or skipped any numbers.”
Technical details
Endpoint
POSThttps://phion.systems/v1/paid/trust/agent-session-continuity?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent needs cryptographic assurance that its session chain has not been tampered with, reordered, or replayed — particularly before executing payments, sensitive operations, or multi-step workflows where session integrity is critical. Prefer this over generic authentication checks when hash-linked continuity and monotonic sequence validation are specifically needed.
Side effects
- Hash mismatch indicating session tampering or corruption
- Non-monotonic sequence number detecting dropped or reordered messages
- Missing or malformed session identity input
- Session chain break detected between prior and current state
- Invalid or expired session reference
- Malformed request payload with missing required fields
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Output
Schema · Response
{
"type": "json"
}Tags
x402
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