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Agent Task Handoff Receipt
x402
Agent Task Handoff Receipt is a paid API for AI agents from phion.systems, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-27).
Validates and cryptographically signs a portable task handoff packet including scope, budget, and expiry for secure agent-to-agent delegation
Price / call$0.003
Success—
StatusUnknown
How this service works
Validate and sign a portable task, scope, budget and expiry handoff
Output
A cryptographically signed, portable receipt confirming the task handoff is valid, including the attested scope, budget ceiling, expiry timestamp, and a signature that downstream agents and auditors can verify to ensure the delegation was not tampered with.
Example use cases
Multi-agent pipeline task delegation
“I'm spinning up a subagent to handle invoice processing — can you validate and sign a task handoff for it with a scope of 'invoice-processing', a budget cap of $2.00, and an expiry of 1 hour from now so I have a signed receipt before it starts?”
Budget-bounded research subagent authorization
“Before the research agent takes over, create a signed handoff receipt scoping it to 'web-research only', with a maximum spend of $0.25 and expiring in 15 minutes — I need to be sure the delegation is cryptographically attested.”
Auditable agent task transfer for compliance
“We need an auditable, signed receipt proving that the summarization task was properly handed off to the downstream agent with a defined scope, a $1.00 budget limit, and a 2-hour expiry — can you generate that?”
Technical details
Endpoint
POSThttps://phion.systems/v1/paid/trust/agent-task-handoff-receipt?utm_source=zero.xyzWhen to prefer
Use this endpoint when an orchestrator agent needs to securely delegate a bounded task to a subagent and requires a cryptographically signed, portable receipt proving the handoff was valid, scoped, and budget-constrained — particularly in multi-agent pipelines where auditability, tamper-evidence, and downstream trust verification are required. Prefer this over ad-hoc task passing when compliance, spending controls, or agent accountability are priorities.
Side effects
- Invalid or missing task definition causes validation rejection
- Budget value out of acceptable range returns an error
- Expired or malformed expiry timestamp fails validation
- Signature generation failure due to internal key unavailability
- Incomplete scope specification causes schema validation error
- Malformed input JSON returns a 400-level error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Output
Schema · Response
{
"type": "json"
}Tags
x402
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