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A2A Transaction Bridge
x402
A2A Transaction Bridge is a paid API for AI agents from phion.systems, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-20).
Binds an A2A (Agent-to-Agent) task identity to a financial transaction while preserving explicit authority gaps between agents
Price / call$0.004
Success—
StatusUnknown
How this service works
Bind A2A task identity to a transaction while preserving explicit authority gaps
Output
Returns a binding record that links the A2A task identity to the specified transaction, including annotations describing explicit authority gaps between agents involved, confirmation of the binding, and metadata about the task-transaction relationship for audit and compliance purposes.
Example use cases
Audit trail for agent-initiated payments
“We just ran an A2A task that triggered a payment — can you bind that task's identity to the transaction record so we have a clear audit trail showing which agent authorized what, with all authority gaps marked?”
Multi-agent workflow payment accountability
“In our multi-agent pipeline, agent A delegated a subtask to agent B which triggered a transaction — bind those task identities to the transaction now, preserving the authority gap between them so we know neither agent had full authority alone.”
Compliance-ready task-transaction linkage
“For compliance purposes, I need the task identity from our A2A job to be formally bound to the outgoing transaction, with explicit notes on where authority boundaries were respected — can you set that up?”
Technical details
Endpoint
POSThttps://phion.systems/v1/paid/trust/a2a-transaction-bridge?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to formally associate an A2A agent task identity with a financial transaction while maintaining explicit records of authority gaps — particularly important in multi-agent systems where no single agent holds full authority and auditability of delegated actions is required. Prefer this over generic logging or state-storage endpoints when the binding must carry semantic meaning about agent authority boundaries.
Side effects
- Invalid or unrecognized A2A task identity returns a binding failure with task-not-found error
- Transaction reference does not exist or is already bound, resulting in conflict or rejection
- Authority gap specification is malformed or inconsistent, causing validation failure
- Missing required fields in the empty input schema may cause unpredictable behavior
- Network or service unavailability returns a 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Output
Schema · Response
{
"type": "json"
}Tags
x402
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