---
skill_id: agent-memory
evaluation: free
price_usd_full: 0.002
challenge: https://lvlltd.com/api/pay?skill=agent-memory
outline: https://lvlltd.com/skills/agent-memory/outline.json
standards: x402, ERC-7857
---

# Free sample — Agent Memory

**Skill ID:** `agent-memory`  
**Full unlock:** $0.002 USDC via x402 on Base  
**Challenge:** https://lvlltd.com/api/pay?skill=agent-memory  
**Outline JSON:** https://lvlltd.com/skills/agent-memory/outline.json

## Summary

Persistent wallet-scoped key-value memory for agents. remember / recall / list / forget metered per call in USDC on Base via x402. Best-effort durability; no subscription.

## When to use

- Agent needs durable state across sessions
- Per-call metering preferred over monthly host plan
- Multiple wallets must not leak private keys

## Decision criteria (buy vs skip)

- You need this when: Agent needs durable state across sessions
- You get capability: Wallet-scoped private / shared / public memory
- Budget fits: full unlock is $0.002 USDC on Base
- You can automate unlock via HTTP 402 without a browser
- You only need teaser/outline first — sealed src/ops stay locked until payment

## Outline (preview)

1. remember(key, value, scope) — write with wallet isolation
2. recall(key, scope) — read back
3. list(prefix, scope) — enumerate keys under a prefix
4. forget(key, scope) — delete
5. x402 per-call USDC on Base; exact atomic amounts
6. Best-effort storage — not SLA-backed in this tier

## Capabilities (preview)

- Wallet-scoped private / shared / public memory
- Per-call x402 metering (remember, recall, list, forget)
- Rate limiting per wallet
- Isolation-tested no cross-tenant leakage
- Pluggable store (KV / Postgres)

## What you get after payment

- SKILL.md (teaser public)
- agent-install.json (public meta)
- src/index.js (stub public; full after unlock)
- Full sealed: src/, schemas/, ops/* (when present) after verified X-PAYMENT

## Agent buy path (zero human UI)

```
GET  https://lvlltd.com/skills/agent-memory/outline.json
GET  https://lvlltd.com/api/pay?skill=agent-memory   → HTTP 402
# transfer maxAmountRequired USDC to payTo on Base
POST https://lvlltd.com/api/pay
  X-PAYMENT: {"txHash":"0x…","skill":"agent-memory"}
# response.sealed_pack.files = full pack
```

## Sample excerpt

# Agent Memory

**Price:** $0.002 USDC  
**Category:** Memory  
**Version:** 1.0.0  
**Protocols:** x402, ERC-7857  
**Tags:** memory, kv, persistence, x402, base, usdc, agent-ops, depth:deep, pricing:per_call  

## Summary

Persistent wallet-scoped key-value memory for agents. remember / recall / list / forget metered per call in USDC on Base via x402. Best-effort durability; no subscription.

## Description

Persistent wallet-scoped key-value memory for agents. remember / recall / list / forget metered per call in USDC on Base via x402. Best-effort durability; no subscription.

## When to use

- Agent needs durable state across sessions
- Per-call metering preferred over monthly host plan
- Multiple wallets must not leak private keys

## After purchase (lvlltd.com)

1. Pay USDC on Base via x402 to the treasury
2. POST `/api/pay` with `X-PAYMENT: {"txHash","skill":"agent-memory"}`
3. Receive `sealed_pack.files` (code + docs)
4. Install: `node scripts/install-unlocked-pack.mjs unlock.json ./skills`
5. `import { createSkill } from './skills/agent-memory/src/index.js'`

## Standards

- x402 micropayments (Base USDC / USDbC)
- ERC-7857 sealed iNFT ownership record (marketplace unlock ≠ runtime design)
- Operational packages ship as sealed pack files after verified payment

## Safety

- No secrets, private keys, or exploit content
- Human escalate on high blast-radius actions
- Not legal, tax, medical, or financial advice