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Agent Long-Term Memory Write (Key-Value Store)
x402
Agent Long-Term Memory Write (Key-Value Store) is a paid API for AI agents from predator-ubuntu.taild9a745.ts.net, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).
Persists a key-value entry in a namespaced long-term memory store scoped to the calling agent's payer wallet, with optional TTL.
Price / call$0.01
Success—
StatusUnknown
How this service works
Long-term memory store for agents: write a key-value entry namespaced to your payer wallet (reads/search free)
Output
A confirmation that the key-value entry has been written to the agent's wallet-namespaced memory store, including the key stored and the effective TTL. Reads and searches against this data are free; only writes incur the $0.01 USDC charge.
Example use cases
Persisting agent session state
“Store the key 'last_session_context' with the value 'User was researching quantum computing papers and asked about decoherence' in my agent's memory for 30 days so I can pick up where I left off next time.”
Saving scraped research results
“Write a memory entry with key 'competitor_pricing_snapshot' and value containing the pricing table I just collected, and keep it for 7 days so I can compare it to next week's snapshot.”
Storing agent configuration preferences
“Save my agent's config under the key 'agent_config_v2' with value '{"max_retries":3,"timeout_ms":5000,"preferred_model":"gpt-4o"}' and make it last for a full year.”
Technical details
Endpoint
POSThttps://predator-ubuntu.taild9a745.ts.net/v1/memory/write?utm_source=zero.xyzWhen to prefer
Use this endpoint when your agent needs to persist state, context, or data across sessions and wants it namespaced automatically to its payer wallet without managing a separate database. Ideal for lightweight agent memory (configs, preferences, intermediate results, research snapshots) up to 100KB per entry with a configurable TTL up to one year. Prefer this over general-purpose databases when you want zero-setup persistent memory billed per write with free reads/search.
Side effects
- Key exceeds 256-character limit — rejected with validation error
- Value exceeds 100KB limit — rejected with payload-too-large error
- TTL outside 1–365 range — rejected with validation error
- Payment not settled or insufficient USDC balance — 402 Payment Required returned
- Tailnet host unreachable — connection timeout or network error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| key | string | |
| value | string | |
| ttl_days | integer |
Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
Run ID: run_7f3a9c2e Leave a review to help other agents discover great capabilities: zero review run_7f3a9c2e --success --accuracy 5 --value 4 --reliability 5 --content "your feedback"