anygas

Gasless cross-chain for AI agents — one signature moves value across 22 EVM chains + Stellar, no native gas.

An AI agent (or any automated system) holds a single verified asset (WETH / USDG / …) and transacts by signing off-chain intents. Robyn's relayer fronts the gas on every chain and is repaid from the asset. The signer needs zero native balance on any chain — it only signs.

pip install anygas

Quickstart

from anygas import Robyn

ag = Robyn(signer="0x<private-key>")                                  # or an eth_account LocalAccount
ag.pay(token=USDG, to=merchant, amount=25_000000)                     # gasless transfer, one signature
ag.cross_chain(fromChain=8453, fromToken=USDC_BASE, amount=25_000000, # MOVE value across chains,
               toChain=42161, toToken=USDC_ARB)                       # gasless on BOTH sides

That's it. With no svc argument the client talks to the hosted gateway at https://api.anygas.xyz/svc — zero config. Read-only methods (info, mesh, quote, route, route_status) work with no signer at all.

AnyGas is a friendly alias for Robyn:

from anygas import AnyGas
ag = AnyGas()                       # read-only, hosted gateway
print(ag.mesh())                    # the cross-chain route graph

One-time Permit2 setup (for cross_chain)

cross_chain uses a Permit2 SignatureTransfer. Once per (token, chain) the agent must approve Permit2 to spend the token:

token.approve(client.permit2, MaxUint256)   // standard one-time Permit2 approval

After that, every cross-chain move is a single gasless signature — no native token ever.

Methods

Method names are snake_case; wire payload keys stay camelCase exactly as the reference JS SDK sends them (fromChain, toToken, verifiedAsset, …).

Notes on the execution methods

• pay / buy / pay_any sign an EIP-712 intent and an EIP-2612 token permit. The permit requires reading the token's name() and nonces(owner) from chain — pass rpc="https://…" to the constructor so the client can do those read-only eth_calls (this mirrors the ethers provider in the JS SDK).
• cross_chain uses Permit2 and needs no RPC — just a signer and the hosted gateway.
• Execution methods raise RobynError if no signer was provided.

Signing

• Intents (Pay / Call / PayAny) are EIP-712 typed data over the Robyn router domain (RobynGaslessRouter / RobynAnyGasRouter, version 1).
• Permit2 (cross_chain) signs PermitTransferFrom(TokenPermissions permitted, address spender, uint256 nonce, uint256 deadline) over the domain {name:"Permit2", chainId, verifyingContract:0x000000000022D473030F116dDEE9F6B43aC78BA3} (no version field), via eth_account.

Integrate, don't replicate

The client in this package is MIT — vendor it, fork it, wrap it, ship it inside your agent. The Robyn relay, router, and on-chain contracts it talks to are proprietary infrastructure, operated by Any-Gas Systems. This SDK is a thin, permissively-licensed door into that hosted service. Build on it — please don't try to clone the relay behind it. See NOTICE.

License

MIT © 2026 Any-Gas Systems. See LICENSE.