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Mnemo Memory Write — POST /v1/memory/remember
x402
Mnemo Memory Write — POST /v1/memory/remember is a paid API for AI agents from memory.reversecaptcha.fun, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).
Writes a typed, tagged memory entry for a user that persists across agents, supporting optional client-side encryption (Tier B) and automatic deduplication.
Price / call$0.002
Success—
StatusUnknown
How this service works
Memory that belongs to the user and follows them across agents. The agent pays per call (x402); the user authorizes the agent once: POST /v1/memory/delegate/challenge {user, agent} returns text the user signs (EIP-191), then POST /v1/memory/delegate {..., signature} returns a bearer token. Send Authorization: Bearer mn_... on every memory call. Start a session with GET /v1/memory/profile, write with POST /v1/memory/remember, retrieve with POST /v1/memory/recall (hybrid vector + keyword). When the user contradicts a memory, POST /v1/memory/conflict supersedes it with history kept. Tier B stores client-side ciphertext the server cannot read. Export and forget are always free.
Output
Returns a JSON object containing a unique memory_id (e.g. 'mem_...') and a deduplicated boolean indicating whether the write was merged with an existing equivalent memory rather than creating a new entry.
Example use cases
Persist dietary restriction across agents
“Save the fact that I'm vegetarian and allergic to nuts as a permanent user preference with tags 'dietary' and 'health' — I want every agent I use to know this automatically.”
Store expiring session state for a workflow
“Remember my current checkout cart state — items: ['blue hoodie size M', 'white sneakers size 10'] — as a 'state' memory with tags ['cart','shopping'] that expires in 3600 seconds so we can resume if I get disconnected.”
Write an encrypted private instruction
“Store a private instruction for me in Tier B encrypted storage: 'Never share my home address with third-party services.' Tag it 'privacy' and 'instruction', kind instruction, so only I can decrypt it.”
Technical details
Endpoint
POSThttps://memory.reversecaptcha.fun/v1/memory/remember?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to durably persist user-specific facts, preferences, instructions, decisions, or state that should survive across multiple agent sessions or different agents. Prefer Mnemo over ad-hoc in-context memory when the user's memory must be portable, owner-controlled, and retrievable via semantic search later. Choose Tier B if the content is sensitive and must remain opaque to the server.
Side effects
- Missing or invalid Bearer token (mn_...) returns 401 Unauthorized
- Payment not settled via x402 returns 402 Payment Required
- Invalid 'kind' enum value returns 400 Bad Request
- Tier B write missing required ciphertext or blind_index fields returns 400
- TTL value is not a positive number returns 400
- Content field is empty or absent returns 400
- Server-side error during vector indexing returns 500
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| ttl | number | seconds until the memory turns stale |
| kind | — | |
| tags | array | |
| tier | — | |
| source | string | |
| content | string | |
| ciphertext | string | |
| confidence | number | |
| blind_index | array |
Output
Schema · Response
{
"type": "json",
"example": {
"memory_id": "mem_...",
"deduplicated": false
}
}Tags
x402
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