# Send Ethereum to your agent
Hand the extracted package to your coding agent with a concrete install brief instead of figuring it out manually.
## Fast path
- Download the package from Yavira.
- Extract it into a folder your agent can access.
- Paste one of the prompts below and point your agent at the extracted folder.
## Suggested prompts
### New install

```text
I downloaded a skill package from Yavira. Read SKILL.md from the extracted folder and install it by following the included instructions. Tell me what you changed and call out any manual steps you could not complete.
```
### Upgrade existing

```text
I downloaded an updated skill package from Yavira. Read SKILL.md from the extracted folder, compare it with my current installation, and upgrade it while preserving any custom configuration unless the package docs explicitly say otherwise. Summarize what changed and any follow-up checks I should run.
```
## Machine-readable fields
```json
{
  "schemaVersion": "1.0",
  "item": {
    "slug": "ethereum",
    "name": "Ethereum",
    "source": "tencent",
    "type": "skill",
    "category": "AI 智能",
    "sourceUrl": "https://clawhub.ai/ivangdavila/ethereum",
    "canonicalUrl": "https://clawhub.ai/ivangdavila/ethereum",
    "targetPlatform": "OpenClaw"
  },
  "install": {
    "downloadUrl": "/downloads/ethereum",
    "sourceDownloadUrl": "https://wry-manatee-359.convex.site/api/v1/download?slug=ethereum",
    "sourcePlatform": "tencent",
    "targetPlatform": "OpenClaw",
    "packageFormat": "ZIP package",
    "primaryDoc": "SKILL.md",
    "includedAssets": [
      "SKILL.md"
    ],
    "downloadMode": "redirect",
    "sourceHealth": {
      "source": "tencent",
      "slug": "ethereum",
      "status": "healthy",
      "reason": "direct_download_ok",
      "recommendedAction": "download",
      "checkedAt": "2026-05-01T09:02:10.602Z",
      "expiresAt": "2026-05-08T09:02:10.602Z",
      "httpStatus": 200,
      "finalUrl": "https://wry-manatee-359.convex.site/api/v1/download?slug=ethereum",
      "contentType": "application/zip",
      "probeMethod": "head",
      "details": {
        "probeUrl": "https://wry-manatee-359.convex.site/api/v1/download?slug=ethereum",
        "contentDisposition": "attachment; filename=\"ethereum-1.0.0.zip\"",
        "redirectLocation": null,
        "bodySnippet": null,
        "slug": "ethereum"
      },
      "scope": "item",
      "summary": "Item download looks usable.",
      "detail": "Yavira can redirect you to the upstream package for this item.",
      "primaryActionLabel": "Download for OpenClaw",
      "primaryActionHref": "/downloads/ethereum"
    },
    "validation": {
      "installChecklist": [
        "Use the Yavira download entry.",
        "Review SKILL.md after the package is downloaded.",
        "Confirm the extracted package contains the expected setup assets."
      ],
      "postInstallChecks": [
        "Confirm the extracted package includes the expected docs or setup files.",
        "Validate the skill or prompts are available in your target agent workspace.",
        "Capture any manual follow-up steps the agent could not complete."
      ]
    }
  },
  "links": {
    "detailUrl": "https://openagent3.xyz/skills/ethereum",
    "downloadUrl": "https://openagent3.xyz/downloads/ethereum",
    "agentUrl": "https://openagent3.xyz/skills/ethereum/agent",
    "manifestUrl": "https://openagent3.xyz/skills/ethereum/agent.json",
    "briefUrl": "https://openagent3.xyz/skills/ethereum/agent.md"
  }
}
```
## Documentation

### Nonce and Stuck Transactions

Every Ethereum account has a nonce that increments with each transaction — if tx with nonce 5 is pending, nonces 6+ are blocked until 5 confirms
To unstick: send a new tx with the SAME nonce and higher gas — this replaces the pending tx (even a 0 ETH self-transfer works)
MetaMask "Speed up" and "Cancel" buttons do exactly this — they resubmit with same nonce and higher priority fee
Nonce gaps cause permanent stuck state — if nonce 3 was never broadcast but 4 was, 4 will never confirm until 3 is sent

### Gas (EIP-1559)

maxFeePerGas = max total you'll pay per gas unit. maxPriorityFeePerGas = tip to validator. baseFee = burned, set by protocol
Actual cost: min(baseFee + priorityFee, maxFee) × gasUsed — unused gas is refunded, but failed txs still consume gas
Gas limit is separate from gas price — setting limit too low causes "out of gas" revert, but you still pay for gas used up to that point
Check current base fee at etherscan.io/gastracker or via eth_gasPrice RPC — wallets often overestimate by 20-50%

### Token Approvals (Critical Security)

ERC-20 approve() grants a contract permission to spend your tokens — many dApps request unlimited (type(uint256).max) approval
If that contract gets hacked, attacker can drain all approved tokens even years later — audit approvals at revoke.cash
Recommend users approve only the exact amount needed, or revoke after each use
Approvals persist forever until explicitly revoked — changing wallets doesn't help if the old address still has tokens

### Failed Transactions

A reverted transaction is mined and consumes gas — you pay even though nothing happened
Common causes: slippage exceeded, deadline passed, insufficient token balance, contract paused
"Transaction failed" in explorer means it executed but reverted — completely different from "pending" (not yet mined)
Simulating transactions before sending (via Tenderly or wallet preview) catches most revert conditions

### L2 Bridges and Withdrawals

Optimistic rollups (Optimism, Arbitrum, Base) have 7-day withdrawal period to mainnet — this is not a bug, it's the security model
ZK rollups (zkSync, Starknet) have faster finality but bridging back still takes 1-24 hours depending on liquidity
Third-party bridges (Hop, Across) offer faster exits but charge fees and have smart contract risk
Never bridge more than you can afford to wait 7 days for — or use a fast bridge and accept the fee

### MEV Protection

Public mempool transactions can be frontrun or sandwiched — especially swaps on DEXs
Flashbots Protect RPC (protect.flashbots.net) hides transactions from public mempool until mined
Private transaction options: MEV Blocker, Flashbots Protect, or DEXs with native protection (CoW Swap)
Signs of sandwich attack: swap executed at worse price than quoted, with suspicious txs immediately before and after yours

### Address Validation

Ethereum addresses are case-insensitive but the checksum (mixed case) catches typos — 0xABC... vs 0xabc... are the same address
ENS domains can expire — always verify current owner before sending to a .eth name
Contract addresses vs EOA: contracts can reject ETH transfers or behave unexpectedly — check on etherscan if address has code
Some tokens have multiple addresses (official + scam clones) — verify contract address on CoinGecko or project's official site
## Trust
- Source: tencent
- Verification: Indexed source record
- Publisher: ivangdavila
- Version: 1.0.0
## Source health
- Status: healthy
- Item download looks usable.
- Yavira can redirect you to the upstream package for this item.
- Health scope: item
- Reason: direct_download_ok
- Checked at: 2026-05-01T09:02:10.602Z
- Expires at: 2026-05-08T09:02:10.602Z
- Recommended action: Download for OpenClaw
## Links
- [Detail page](https://openagent3.xyz/skills/ethereum)
- [Send to Agent page](https://openagent3.xyz/skills/ethereum/agent)
- [JSON manifest](https://openagent3.xyz/skills/ethereum/agent.json)
- [Markdown brief](https://openagent3.xyz/skills/ethereum/agent.md)
- [Download page](https://openagent3.xyz/downloads/ethereum)