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Port 402 Memory Read
x402
Port 402 Memory Read 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 2026-10-31).
Retrieves a stored value from an agent's persistent key-value memory store by key name.
Price / call$0.001
Success—
StatusUnknown
How this service works
Store a JSON value under a key in your persistent memory (namespace = your paying wallet).
Output
Returns the value associated with the provided key from the agent's persistent memory store. The response is a JSON object containing the stored value (if it exists) for that key. Returns an empty or not-found response if the key does not exist.
Example use cases
Recall saved agent configuration
“Fetch the value I stored under the key 'agent-config:retry-limit' in my persistent memory so I can use it to configure this new task.”
Retrieve workflow state mid-run
“Look up the memory key 'workflow:step3-output' and tell me what value is stored there — I need it to continue processing.”
Check stored user preference
“Pull up whatever I saved under 'session:user-timezone' in my persistent memory so I can schedule this correctly.”
Technical details
Endpoint
PUThttps://port-402-production.up.railway.app/v1/memory/:key?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent needs to read back a value it (or another agent) previously stored in Port 402's persistent key-value memory. Ideal for stateful autonomous agent workflows that require memory between runs without any account setup or API key — only a per-call x402 micropayment is needed. Not suitable for bulk reads or scanning memory contents (use the list-keys sibling endpoint for that).
Side effects
- Key not found — if the key was never written or has been deleted, the endpoint returns an empty or null value
- Invalid key format — keys must match the pattern ^[A-Za-z0-9._:-]{1,128}$; invalid characters or length will cause a 400 error
- Payment failure — if the x402 micropayment of $0.001 USDC cannot be processed, the request is rejected
- Network/service downtime on Railway infrastructure causing 502 or timeout errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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