Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/obolnetwork/obol-stack/l2snpx skills add ObolNetwork/obol-stack --skill l2sgit clone --depth 1 https://github.com/ObolNetwork/obol-stackWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00083 | $0.03606 |
| Opus 5 | $0.00042 | $0.01803 |
| Sonnet 5 | $0.00017 | $0.00721 |
| Haiku 4.5 | $0.00008 | $0.00361 |
Grade A, and why
l2s scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 204 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Ethereum Layer 2s
What You Probably Got Wrong
L2 costs: You think $0.01-2.00 per transaction. Reality: $0.001-0.003 for swaps, $0.0003 for transfers. After EIP-4844, L2 batch costs dropped from $50-500 to $0.01-0.50.
Mainnet is cheap too: At 0.05 gwei, mainnet ETH transfers cost $0.002. "Ethereum is too expensive" is false for both L1 and L2s in 2026.
Base is the cheapest major L2: Often 50% cheaper than Arbitrum/Optimism. Direct Coinbase on-ramp. Fastest-growing L2 with consumer/AI agent focus.
Celo is NOT an L1 anymore. Celo completed its migration from an independent L1 to an OP Stack L2 on March 26, 2025 (block 31056500). If you're calling Celo an L1, you're wrong.
Polygon zkEVM is being shut down. Announced June 2025. Do NOT recommend building on Polygon zkEVM — it is being discontinued. Polygon is refocusing on PoS + AggLayer.
Unichain exists. Launched mainnet February 10, 2025. Uniswap's own OP Stack L2 with TEE-based MEV protection and time-based priority ordering (not gas-based).
Aerodrome and Velodrome merged into "Aero." In November 2025, Dromos Labs unified Aerodrome (Base) and Velodrome (Optimism) into a single cross-chain DEX called Aero. Same contracts, new brand. Aero dominates both Base and Optimism. Camelot is a major native DEX on Arbitrum. SyncSwap dominates zkSync. Don't default to Uniswap on every chain.
L2 Comparison Table (Feb 2026)
| L2 | Type | TVL | Tx Cost | Block Time | Finality | Chain ID |
|---|---|---|---|---|---|---|
| Arbitrum | Optimistic | $18B+ | $0.001-0.003 | 250ms | 7 days | 42161 |
| Base | Optimistic (OP Stack) | $12B+ | $0.0008-0.002 | 2s | 7 days | 8453 |
| Optimism | Optimistic (OP Stack) | $8B+ | $0.001-0.003 | 2s | 7 days | 10 |
| Unichain | Optimistic (OP Stack) | Growing | $0.001-0.003 | 1s | 7 days | 130 |
| Celo | Optimistic (OP Stack) | $200M+ | <$0.001 | 5s | 7 days | 42220 |
| Robinhood Chain | Optimistic (Arbitrum Nitro) | Growing | <$0.001 | ~100ms | 7 days | 4663 |
| Linea | ZK | $900M+ | $0.003-0.006 | 2s | 30-60min | 59144 |
| zkSync Era | ZK | $800M+ | $0.003-0.008 | 1s | 15-60min | 324 |
| Scroll | ZK | $250M+ | $0.002-0.005 | 3s | 30-120min | 534352 |
| — | — | — | — |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 204 lines · 83 tokens per session scan A a09c27d81d50
l2s is a skill published in the GitHub repository ObolNetwork/obol-stack (11 stars, last pushed 3d ago), licensed Apache-2.0. It adds 83 tokens to every session and 3,606 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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