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The knowledge base for AI agents and production crosschain apps.

Skills

Across Protocol Skill

core

The entry point. Decision tree, opinionated defaults, and operating procedure for all crosschain integrations.

Swap API

core

The recommended integration path. Covers GET /swap/approval for crosschain swaps and POST /swap/approval for embedded actions. Includes trade types, slippage, error codes, and end-to-end code examples.

Suggested Fees API

integration

Legacy bridge-only path using GET /suggested-fees for fee quotes and manual depositV3 construction on the SpokePool contract.

Embedded Crosschain Actions

core

Execute contract calls on the destination chain immediately after a bridge or swap. Bridge + mint, stake, or deposit in a single transaction.

Deposit Tracking

integration

Track deposit lifecycle via GET /deposit/status. Covers status values, polling patterns, latency expectations, and bulk retrieval.

Chains & Tokens

reference

Reference for chain IDs, token addresses, and discovery endpoints. Covers mainnet and testnet chains with canonical token addresses.

Security Checklist

reference

Comprehensive security review for Across integrations. Covers approvals, slippage, refund handling, embedded action safety, 8 audits, and $1M bug bounty.

Resources & Links

reference

Canonical reference for documentation, SDK links, API base URLs, contract addresses, and community links.

MCP Server

core

Connect any AI agent to Across via the MCP server. Get live quotes, execute swaps, track deposits, and query chains and tokens — all through a standard tool interface.

How to Use

Just Tell Your Agent

Paste the skill URL in your AI agent's context and ask it to build with Across.

Fetch https://raw.githubusercontent.com/across-protocol/skills/master/skills/SKILL.md and use it to bridge USDC from Arbitrum to Base

curl / fetch

Fetch any skill file directly. All files have CORS enabled.

curl https://raw.githubusercontent.com/across-protocol/skills/master/skills/swap/SKILL.md

Claude Code Skill

Install as a Claude Code skill for persistent context across sessions.

/skill add across-protocol-ai-agent-skill

MCP Server

Connect any AI agent to live Across tools — quotes, swaps, tracking, and more.

https://mcp.across.to/mcp