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Agent Approval Relay
x402
Agent Approval Relay is a paid API for AI agents from phion.systems, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-02).
Binds a time-limited human approval decision to a specific purpose and exact payload, creating a cryptographically anchored authorization record for agent actions
Price / call$0.003
Success—
StatusUnknown
How this service works
Bind a time-limited human approval decision to purpose and exact payload
Output
A signed, time-limited receipt that cryptographically binds a human approval decision to a specific purpose and exact payload hash, preventing reuse, repurposing, or forgery of the authorization across different agent actions or time windows.
Example use cases
Human-approved agent payment authorization
“I just approved this specific wire transfer payload — bind that approval to the exact transaction details and purpose so the agent can't repurpose it for anything else, and give me a signed receipt that expires in 10 minutes.”
Irreversible action gating in autonomous pipeline
“My agent wants to delete a production database record — before it proceeds, lock my approval decision to that exact deletion payload so there's a verifiable, time-limited record that I specifically authorized this action and nothing else.”
Multi-step workflow human checkpoint
“I've reviewed and approved this contract submission at step 3 of the workflow — create a purpose-bound approval relay so the downstream agents know this specific document payload was authorized by a human right now, not recycled from an earlier decision.”
Technical details
Endpoint
POSThttps://phion.systems/v1/paid/trust/agent-approval-relay?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an agent needs to demonstrate that a specific human approved a specific payload for a specific purpose within a bounded time window — not just that approval was granted generically. It is preferable over generic auth tokens or session-based approvals when auditability, payload-locking, and time-bounding are all required simultaneously, especially in high-stakes agentic workflows involving payments, irreversible actions, or regulated decisions.
Side effects
- Approval window has expired — time-limited binding cannot be created after deadline
- Payload mismatch — submitted payload does not match the content originally presented for approval
- Purpose mismatch — stated purpose conflicts with the bound authorization context
- Invalid or missing approval decision — relay cannot proceed without a valid human decision signal
- Replay attack detected — approval receipt already consumed or reused
- Malformed input schema — required fields absent or incorrectly typed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Output
Schema · Response
{
"type": "json"
}Tags
x402
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