Zapper Skill
Without access to onchain data, agents operate blind to blockchain activity. They lack understanding of what's happening onchain and have limited or no visibility into wallet balances, token prices, market trends, DeFi positions, NFT holdings, and cross-chain activity.
Integrating Zapper with your agent is the equivalent of giving it glasses—enabling it to see live, accurate blockchain data across 60+ chains in real-time. This visibility transforms your agent from simply executing commands to making informed decisions based on actual onchain conditions, portfolio states, and market dynamics.
Making the skill available
The Zapper skill can be installed for agents like Codex, OpenClaw, Claude, or any other agent that supports skills.
Ask your agent to fetch the Zapper skill at https://build.zapper.xyz/skill.md. Make sure your agent not only reads but also saves the skill.md file at the right location — usually ~/.{your-agent-name}/skills/zapper. For example: ~/.codex/skills/zapper.
Example prompt:
Hey agent! Fetch and download the Zapper skill from
https://build.zapper.xyz/skill.md. Follow it, and make it available
to use in your skills.
You may need to restart your agent for the skill to show up and become available.
Using the skill
You can invoke the skill manually or let your agent choose to use it. The first time it does, it will ask you to choose between authenticating via API key or via x402.
x402 authentication
Your agent will create a .zapper-credentials file, in which you can paste your funded wallet's private key.
Your private key is never sent to Zapper. It is used locally to create your signer, which authorizes the transfer of the specific amount required for each request.
API key authentication
Using your Zapper API key is also possible to authenticate requests for the Zapper skill. Paste your Zapper API key (available at build.zapper.xyz/dashboard) directly to your agent, and you're ready to go.
Once authenticated, your agent will automatically run a test query and confirm when it's ready. From that point on, your agent can use the Zapper API fully autonomously using the Zapper skill.