anygas-mcp

anygas-mcp

Integrate, don't replicate. This package is MIT — integrate Robyn into your app, agent, or product freely, no restrictions. The license covers only this client library; Robyn's relayer, smart contracts, and network are proprietary and are not licensed here. Don't use it (or the Robyn API) to run a competing gasless-relay service or to replicate Robyn. See NOTICE. Build with Robyn: yes. Clone Robyn to cut it out: no.

Gasless cross-chain for AI agents, as an MCP server.

Give any MCP-capable agent (Claude Desktop, Cursor, agent frameworks) the ability to move value across 22 EVM chains + Stellar with one signature and zero gas management — no native token, no per-chain balances, no bridge picking. Robyn's relayer fronts all gas on both chains and is reimbursed from the token being moved.

Tools

Tool	Needs key	What it does
robyn_mesh	no	List the gasless chains + cross-chain route graph (22 EVM nodes + Stellar).
robyn_quote	no	Best gasless route for a move — estimated output, bridge, duration, fee. Read-only.
robyn_route_status	no	Track an in-flight route (BRIDGING → DONE) with the destination tx.
robyn_cross_chain	yes	Execute a gasless cross-chain move. Signs one Permit2 intent; the agent pays no gas.

Read tools work with no credentials. robyn_cross_chain only activates when ROBYN_SIGNER_KEY is set — otherwise the server is safely read-only.

Configure (Claude Desktop)

{
  "mcpServers": {
    "robyn": {
      "command": "npx",
      "args": ["-y", "anygas-mcp"],
      "env": {
        "ROBYN_SVC": "https://api.anygas.xyz/svc",
        "ROBYN_SIGNER_KEY": "0x…"          // optional — omit for read-only
      }
    }
  }
}

One-time setup (only for execution)

Permit2 SignatureTransfer requires a single, standard approval per (token, chain) — done once by the signer:

await token.approve("0x000000000022D473030F116dDEE9F6B43aC78BA3", ethers.MaxUint256);

After that, every cross-chain move is a single gasless signature — the agent never holds native gas anywhere.

Example

Agent: "Move 25 USDC from Base to Arbitrum." Calls robyn_cross_chain({ fromChain: 8453, fromToken: "0x833589…", amount: "25000000", toChain: 42161, toToken: "0xaf88…" }) → { id: "rt_…", status: "BRIDGING", gasless: true }, then robyn_route_status → DONE.

Stellar is a first-class destination too — set toChain: "stellar" and toToken: "USDC".

Security notes

• ROBYN_SIGNER_KEY is a hot key. Fund it only with what an agent should be able to move; treat the MCP env as a secret.
• The signer never submits a transaction or spends gas — it only signs Permit2 intents. Robyn's relayer executes and fronts gas.
• Leave ROBYN_SIGNER_KEY unset to run a safe, read-only quoting/tracking server.

MIT.