Agent memory, save: key value store for agents

$0.002 per call · failed calls are never charged · no account or API key needed

Save a value (up to 8,000 characters of text or JSON) under a key in your own namespace, so an agent can remember facts, preferences or task state between runs. Overwrites an existing key; expires after 1 to 30 days (default 30). Values are kept until they expire (at most 30 days) or are deleted; reads anywhere may lag a write made elsewhere by up to a minute. Use to persist what an agent learned for a later call to memory_get.

Run it free (25 free calls) Buy credits by card (from $5) Example result (JSON)

Try it with your own inputs

Your namespace: a secret of 16 to 128 letters, digits, - or _ that you choose and reuse. Anyone who knows it can…
The key, up to 200 characters
The text or JSON to save, up to 8,000 characters

Uses one of your 25 free calls. Nothing is charged, and a call that fails is not counted.

Inputs

NameTypeDescription
namespace (required)stringYour namespace: a secret of 16 to 128 letters, digits, - or _ that you choose and reuse. Anyone who knows it can read and write it, so treat it like a password; send it in a POST body to keep it out of URLs.
key (required)stringThe key, up to 200 characters
value (required)stringThe text or JSON to save, up to 8,000 characters
daysstringDays to keep it, 1 to 30 (default 30)

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://agent-data-tools.revmesh2074.workers.dev/memory/set?namespace=demo-agent-memory-7f3c9a21&key=user-preferences&value=%7B%22language%22%3A%22en%22%2C%22units%22%3A%22metric%22%7D"

Or one of your 25 free calls, no key:

curl "https://agent-data-tools.revmesh2074.workers.dev/memory/set?namespace=demo-agent-memory-7f3c9a21&key=user-preferences&value=%7B%22language%22%3A%22en%22%2C%22units%22%3A%22metric%22%7D&trial=1"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum or Solana over x402; Base or Tempo over MPP) and retries.

Example result

{
  "key": "user-preferences",
  "saved": true,
  "updatedAt": "2026-10-25T15:00:00.000Z",
  "expiresAt": "2026-11-24T15:00:00.000Z",
  "size": 34
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is memory_set, and the first 25 successful calls are free:

https://agent-data-tools.revmesh2074.workers.dev/mcp

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