External Deposit Agent Skill

External Deposit

Use this skill for deposits that should be completed in an external wallet or third-party bridge UI rather than by exporting Superior-managed keys or encoding arbitrary transaction calldata into a QR code.

When to Use

• The user wants to bridge or deposit from their own wallet into a destination chain/token.
• The user asks for a MetaMask Mobile QR code, Relay bridge link, Robinhood Chain USDG, or a prefilled bridge URL.
• The user needs Polygon USDC, USDC.e, or pUSD payment links.
• A QR transaction attempt shows unexpectedly high gas or wrong-network behavior.
• The flow is not a simple native/ERC-20 transfer to a known Superior-managed wallet.

Use skills/v3/primitives/deposit-qr only for simple wallet funding QRs: native token sends or ERC-20 transfer payment URIs to a destination address.

Safety Rules

• Never ask for private keys, seed phrases, passwords, or wallet credentials.
• Do not encode arbitrary contract calldata such as approve(...) or bridge deposit calls into MetaMask Mobile QR/deeplinks. MetaMask Mobile supports native sends and token transfers better than arbitrary transaction calldata; forcing calldata can show wrong or high fees.
• If source chain and destination chain are the same and the token contract is the same, use a direct ERC-20 transfer payment URI instead of Relay.
• Prefer a provider UI prefill URL or WalletConnect when the user uses MetaMask Mobile.
• Always show the source chain, source token contract, destination chain, destination token contract, recipient, quote amount, and expected gas before the user signs.
• If MetaMask shows a high fee when the quote gas is tiny, tell the user to reject the transaction.
• Do not claim funds arrived. Verify with the bridge status URL, explorer, wallet balance, or Superior Trade API.

Same-Chain ERC-20 Transfer

When the source chain, destination chain, and token contract are identical, do not use Relay. Generate an EIP-681 ERC-20 transfer URI:

ethereum:<token-address>@<chain-id>/transfer?address=<recipient>&uint256=<amount-base-units>

The bundled script automatically switches to this mode when --from-chain, --to-chain, --from-token, and --to-token resolve to the same chain/token and --recipient plus --to-amount are provided. In this mode:

• mode is direct_erc20_transfer.
• payment_uri contains the transfer URI.
• relay_url and quote are null.
• Every wallet link points to the payment URI.

Supported built-in chains and tokens:

| Chain | Tokens |

|---|---|

| ethereum | USDC |

| arbitrum | USDC |

| base | USDC |

| avalanche | USDC |

| polygon | USDC, USDC.e, pUSD |

| robinhood | USDG |

Custom ERC-20 token addresses are also accepted and default to 18 decimals.

Relay Bridge Prefill

Relay supports bridge URLs shaped like:

https://relay.link/bridge/<destination-chain>?toCurrency=<destination-token>&fromChainId=<source-chain-id>&fromCurrency=<source-token>&toAddress=<recipient>&amount=<target-amount>&tradeType=EXPECTED_OUTPUT

Use toAddress, amount, and tradeType=EXPECTED_OUTPUT when a recipient and target output amount are known. Relay's web app uses EXPECTED_OUTPUT to prefill the Buy field; keep using the quote API with EXACT_OUTPUT when you need a live exact-output quote.

For MetaMask Mobile, wrap the Relay URL:

https://link.metamask.io/dapp/<url-encoded-relay-url>

Supported wallet link targets:

| Wallet target | Link format |

|---|---|

| metamask | https://link.metamask.io/dapp/<encoded-url> |

| trust | https://link.trustwallet.com/open_url?coin_id=60&url=<encoded-url> |

| okx | okx://wallet/dapp/url?dappUrl=<encoded-url> |

| plain | raw Relay URL |

Always include plain as a fallback when a wallet-specific link fails to open.

Example: Arbitrum USDC to Robinhood Chain USDG:

https://relay.link/bridge/robinhood?toCurrency=0x5fc5360d0400a0fd4f2af552add042d716f1d168&fromChainId=42161&fromCurrency=0xaf88d065e77c8cc2239327c5edb3a432268e5831&toAddress=0xF60CA00ef5e510137bC09691b52BA7863F52158F&amount=20&tradeType=EXPECTED_OUTPUT

This opens Relay with the route prefilled. The user still reviews the live quote and signs normal wallet prompts inside Relay.

QR Generator

Use the bundled script:

node skills/external-deposit/scripts/create-relay-bridge-qr.mjs \
  --from-chain arbitrum \
  --from-token USDC \
  --to-chain robinhood \
  --to-token USDG \
  --wallet metamask \
  --wallet trust \
  --wallet okx \
  --wallet plain \
  --recipient 0xF60CA00ef5e510137bC09691b52BA7863F52158F \
  --to-amount 20 \
  --quote

It prints JSON with:

• mode — direct_erc20_transfer for same-chain token sends, otherwise relay_bridge.
• relay_url — prefilled Relay bridge URL.
• payment_uri — EIP-681 ERC-20 transfer URI for same-chain direct transfers.
• wallet_links — wallet-specific dapp URLs and QR URLs for requested targets.
• metamask_mobile_url — backward-compatible alias for the MetaMask link when requested.
• qr_url — hosted QR image URL for the default wallet link.
• quote — live Relay quote summary when --quote is provided.
• summary — route, token contracts, recipient, and amount.

If no --wallet flags are provided, the script emits metamask and plain.

Display the QR in Markdown when the client supports images:

![Relay Deposit QR](https://quickchart.io/qr?size=360&text=...)

Example Response

Relay Deposit Summary:
* From: Arbitrum USDC
* Source token: 0xaf88d065e77c8cc2239327c5edb3a432268e5831
* To: Robinhood Chain USDG
* Destination token: 0x5fc5360d0400a0fd4f2af552add042d716f1d168
* Recipient: 0xF60CA00ef5e510137bC09691b52BA7863F52158F
* Quote: pay 20.14 USDC, receive 20 USDG
* Expected gas: tiny Arbitrum ETH gas

Scan this QR with your phone camera to open Relay inside MetaMask Mobile.
Reject the transaction if MetaMask shows the wrong chain or a high network fee.

Common Mistakes

• Generating a QR for Relay approve or deposit calldata and expecting MetaMask Mobile to show a safe transaction popup.
• Using a plain address QR for a bridge route; it omits source chain, destination chain, token mapping, and quote.
• Treating a Relay quote as permanent. Quotes are time-sensitive; refresh immediately before signing.
• Assuming the Relay UI prefilled every field. The agent must tell the user which values to confirm in Relay before signing.