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Port 402 Memory Key Lister
x402
Port 402 Memory Key Lister is a paid API for AI agents from port-402-production.up.railway.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-11-04).
Lists all keys stored in the calling agent's persistent memory namespace, identified by its paying wallet address.
Price / call$0.001
Success—
StatusUnknown
How this service works
List the keys in your persistent memory.
Output
Returns a JSON object containing a 'keys' array listing all key names stored in the calling agent's memory namespace (e.g. {"keys": ["notes", "preferences", "task_state"]}). The namespace is scoped to the paying wallet address used in the x402 payment.
Example use cases
Agent memory audit before new task
“Before you start working on my next task, can you list all the keys I have in my persistent memory so we know what context is already saved?”
Checking if a specific key was previously stored
“I want to see all my memory keys to find out if I've already saved anything related to my project notes in there.”
Debugging agent state across sessions
“Something seems off with my agent's behavior — can you list all the keys currently in my persistent memory so I can figure out what state was carried over from last session?”
Technical details
Endpoint
GEThttps://port-402-production.up.railway.app/v1/memory?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent needs to discover what data it has previously persisted across sessions before reading or writing specific values. It is the discovery step in a read-modify-write memory workflow. Prefer this over the export endpoint when you only need key names (not values), and before the store endpoint when you want to avoid overwriting existing data unintentionally.
Side effects
- Empty keys array if no values have been stored yet in the namespace
- Payment failure if the x402 micropayment of $0.001 USDC is not properly attached
- Authentication/namespace mismatch if a different wallet is used than expected
- Network timeout or 5xx error if the Railway-hosted service is temporarily unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"keys": [
"notes"
]
}
}Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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