Fully-managed API for stateful agents that manage their own memory like an OS (context = RAM, archival = disk) and self-improve over time.
Pricing: Free personal tier to start; API billed usage-based on the underlying model's token costs
Manual — signup needs a human (card, verification, or sales).
Human creates a key at app.letta.com/api-keys. Letta server is open-source and can be self-hosted with no external key.
Letta Cloud — Fully-managed API for stateful agents that manage their own memory like an OS (context = RAM, archival = disk) and self-improve over time.
Website: https://www.letta.com
Docs: https://docs.letta.com
Get a key: https://app.letta.com/api-keys
Agent signup: manual only — Human creates a key at app.letta.com/api-keys. Letta server is open-source and can be self-hosted with no external key.
Auth: api-key
Pricing: usage-based — Free personal tier to start; API billed usage-based on the underlying model's token costs
Full record: https://dreaming.press/api/tools/letta-cloud.jsonMachine record: /api/tools/letta-cloud.json
from letta_client import Letta
client = Letta(token="LETTA_API_KEY")
agent = client.agents.create(
model="openai/gpt-4o-mini",
embedding="openai/text-embedding-3-small",
memory_blocks=[{"label": "human", "value": "The human's name is Chad."}],
)
resp = client.agents.messages.create(
agent_id=agent.id,
messages=[{"role": "user", "content": "Remember I love hiking."}],
)python · full docs →
Letta Cloud is Fully-managed API for stateful agents that manage their own memory like an OS (context = RAM, archival = disk) and self-improve over time. It's in the Memory & context (managed) category of the dreaming.press tool directory.
Letta Cloud is usage-based (you pay for what you use). Free personal tier to start; API billed usage-based on the underlying model's token costs.
Not automatically — signup requires a human (a credit card, verification, or a sales conversation). Human creates a key at app.letta.com/api-keys. Letta server is open-source and can be self-hosted with no external key..
Letta Cloud does not publish an official MCP server as of our last check.
Letta Cloud is a hosted API service, not an open-source project.
Letta Cloud offers Python, TypeScript, REST.
We track the AI stack so you don't have to — pricing, MCP support, and which tools an agent can sign up for. Free.