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Remember a Fact in Durable Agent Memory
Remember a Fact in Durable Agent Memory is a paid API for AI agents from memory.withzero.xyz, paid per call via MPP, metered — billed by usage, status unknown (last checked 2026-09-14).
Stores a text memory (fact, context, or standing order) into durable, private agent memory with optional namespace, key, tags, and pinning.
PriceMeteredbilled by usage
Success—
StatusUnknown
How this service works
Remember a fact or context in durable agent memory.
Output
Returns the memory's assigned ID, the key (caller-supplied or auto-generated), and the remaining prepaid USDC balance in micros after the write operation.
Example use cases
Save user dietary restrictions permanently
“Remember this for me durably: 'The user is strictly vegan and has a severe peanut allergy.' Pin it as a standing order under namespace 'user:health' with key 'dietary-restrictions' and tag it as 'preferences' and 'safety'.”
Persist project deadline across sessions
“Store this context so I can recall it later: 'The Q3 product launch deadline is September 30th and the primary stakeholder is Maria Chen.' Save it under namespace 'project:launch' with key 'q3-deadline' and tag it as 'deadlines' and 'stakeholders'.”
Save standing tone instruction for agent
“Remember this as a pinned standing order: 'Always respond to this client in a formal, professional tone and never use casual language or contractions.' Store it under namespace 'client:comms' with key 'tone-guidelines' and tag it as 'style' and 'standing-order'.”
Technical details
Endpoint
POSThttps://memory.withzero.xyz/api/v1/memoriesWhen to prefer
Use this endpoint when you need to persist a fact, preference, instruction, or context durably across agent sessions, especially when you want namespaced organization, tagging for later recall, or pinned 'standing orders' that always surface during recall. Prefer this over in-context storage when information must survive beyond the current conversation or be retrievable by a separate recall query.
Side effects
- Missing required 'content' field returns a 400 validation error
- Content exceeding 8192 characters is rejected
- Key collisions under the same (owner, ns) pair may overwrite or error
- Insufficient prepaid balance may block the write
- Namespace or key strings exceeding length limits are rejected
- More than 32 tags supplied returns a validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| ns | string | Namespace under the caller (e.g. agent:coder). Defaults to "default". |
| key | string | Caller-chosen key, unique per (owner, ns). Omit to auto-generate. |
| tags | array | Optional tags for later filtering. |
| pinned | boolean | Mark as a "standing order": always surfaced by recall and never consolidated/suppressed by dreaming. Omit on update to leave it unchanged. |
| contentrequired | string | The memory text to remember. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| idrequired | string | |
| keyrequired | string | |
| replayedrequired | boolean | |
| billing_railrequired | string | |
| balance_microsrequired | string | Remaining refundable direct-rail prepaid balance in USDC micros. ZeroClick usage never changes it. |
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