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MCP Transaction Gateway
x402
MCP Transaction Gateway is a paid API for AI agents from phion.systems, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-23).
Binds an MCP tool-call identity to a payment transaction without silently granting spending authority
Price / call$0.004
Success—
StatusUnknown
How this service works
Bind MCP tool-call identity to a transaction without silently granting authority
Output
A signed receipt or attestation confirming that the specified MCP tool-call identity has been explicitly bound to the transaction, with no implicit or ongoing spending authority granted beyond the declared scope.
Example use cases
Least-privilege payment gate for MCP agent
“I need to make sure that when my MCP agent calls a paid tool, it doesn't silently inherit spending authority — can you bind the tool-call identity to this transaction explicitly so I get a receipt proving who authorized the payment?”
Audit trail for agentic commerce
“My multi-agent pipeline is initiating a transaction and I need a verifiable record showing exactly which MCP tool call triggered it without granting that tool any broader authority — bind the identity and give me an attestation I can audit later.”
Preventing unauthorized spend escalation
“Before this MCP tool call is allowed to move funds, I want to explicitly authorize just this transaction — not open up any ongoing spending authority — so bind the tool-call identity to the payment now and confirm nothing beyond this single transaction is granted.”
Technical details
Endpoint
POSThttps://phion.systems/v1/paid/trust/mcp-transaction-gateway?utm_source=zero.xyzWhen to prefer
Use this endpoint when an MCP-based agent needs to initiate or participate in a payment transaction and you require explicit, auditable identity binding to that transaction — specifically to prevent the agent from silently inheriting spending authority. Prefer this over generic payment authorization when the caller is an MCP tool and least-privilege enforcement plus provenance attestation are required.
Side effects
- Missing or malformed MCP tool-call identity results in a 400 error and rejection
- Transaction reference not found or already bound returns a conflict error
- Attempt to bind with mismatched identity/transaction scope is rejected to prevent authority escalation
- Malformed request body (empty schema) may cause validation errors if required fields are absent
- Network or upstream service errors return 5xx with no binding issued
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Output
Schema · Response
{
"type": "json"
}Tags
x402
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