---
skill_id: tool-call-rate-limiter
evaluation: free
price_usd_full: 3.99
challenge: https://lvlltd.com/api/pay?skill=tool-call-rate-limiter
outline: https://lvlltd.com/skills/tool-call-rate-limiter/outline.json
standards: x402, ERC-7857
---

# Free sample — Tool-Call Rate Limiter

**Skill ID:** `tool-call-rate-limiter`  
**Full unlock:** $3.99 USDC via x402 on Base  
**Challenge:** https://lvlltd.com/api/pay?skill=tool-call-rate-limiter  
**Outline JSON:** https://lvlltd.com/skills/tool-call-rate-limiter/outline.json

## Summary

Per-tool throttles and backoff so agents stop hammering paid APIs.

## When to use

- Agent loops on a failing tool and blows API quota
- Multiple workers share one key and trip 429s
- Need budget-linked QPS for paid search or LLM tools

## Decision criteria (buy vs skip)

- You need this when: Agent loops on a failing tool and blows API quota
- You get capability: Per-tool token bucket config
- Budget fits: full unlock is $3.99 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. Inventory tools with cost class free / metered / expensive
2. Assign bucket size, refill rate, and hard daily cap per tool
3. On 429 or cost spike, apply jittered backoff and circuit open
4. Share limiter state across workers via store key
5. Emit limiter-config.json + 429 incident play

## Capabilities (preview)

- Per-tool token bucket config
- Shared limiter state key design
- Circuit-open on 429 storms
- Daily hard cap with owner alert

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

## Sample excerpt

# Tool-Call Rate Limiter

Agents that retry aggressively turn one flaky tool into a bill. This pack gives concrete limiter configs by cost class, shared state ideas for multi-worker fleets, and a circuit-open path when 429s cluster. It is operational, not theory: tables you can paste into a governor.

Works with agent-budget-governor for dollar caps and timeout-retry for wait policies.

When to use: any fleet using paid search, scrapers, or high-volume LLM tools.

**Price:** $3.99 USDC on Base via x402 unlock.

**Standards:** x402 payments · ERC-7857 sealed skill model · agent-swarm ready.

Operator notes for Tool-Call Rate Limiter: treat this as a capability pack you wire into real tools—not a certification or hosted SaaS. Pair it with free evaluation at /skills/tool-call-rate-limiter/outline.json before paying. Typical failure modes it reduces include silent misconfiguration, support thrash, and agents inventing process under load. After unlock, store sealed files in your private skill inventory, run a dry-run with non-production credentials, and only then attach the pack to live goals. Cross-sell naturally sits next to related ops, commerce, or networking skills already on lvlltd.com so agents can compose a ladder instead of a one-off purchase.