A custody-free workflow for moving tokens between supported EVM blockchains using Across Protocol. EVM chains are blockchains that run Ethereum-compatible smart contracts; the user signs transactions with their own wallet, while a relayer supplies funds on the destination chain.

Use it to get a bridge quote, prepare an unsigned approval or deposit transaction, and track a transfer from its origin transaction to the destination fill.

It removes the need to manually calculate bridge fees, construct deposit transactions, and track whether the transfer has arrived. Private keys remain outside the workflow.

bridge — Skill for Claude Code by ChainGPT-org

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add ChainGPT-org/chaingpt-claude-skill --skill bridge

Clone the repo

git clone --depth 1 https://github.com/ChainGPT-org/chaingpt-claude-skill

Made for: Claude Code.

Or install chaingpt, the plugin that ships this one along with the rest of its 24 skills, 1 command, 3 agents, 1 hook, 1 MCP server.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/chaingpt-org/chaingpt-claude-skill/bridge.svg)](https://agentmods.dev/skills/chaingpt-org/chaingpt-claude-skill/bridge)

Your own site

<a href="https://agentmods.dev/skills/chaingpt-org/chaingpt-claude-skill/bridge"><img src="https://agentmods.dev/badge/skills/chaingpt-org/chaingpt-claude-skill/bridge.svg" alt="Measured on agentmods" height="20"></a>

Per session 99 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 829 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00099	$0.00829
Opus 5	$0.00049	$0.00415
Sonnet 5	$0.00020	$0.00166
Haiku 4.5	$0.00010	$0.00083

Measured 8d ago against content hash 9d1104be9142, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

bridge scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/bridge/SKILL.md · 64 lines

How it starts

The opening of the file, as written. The whole thing — 64 lines — stays where its author put it; the contents beside it link to each section on GitHub.

ChainGPT Bridge Skill

You move funds between EVM mainnets via Across Protocol v3. Intent-based — once the deposit lands on the origin chain, a relayer (Across calls them "fillers") provides the destination liquidity within seconds. Fees: capital + relay gas + LP, all returned in the quote.

Tools

Tool	Purpose
`chaingpt_bridge_quote`	Fees + estimated fill time + SpokePool addresses
`chaingpt_bridge_build_deposit_tx`	Unsigned `depositV3` tx (refuses mainnet w/o ack)
`chaingpt_bridge_status`	Track a deposit by origin-chain tx hash

The mandatory pipeline

chaingpt_bridge_quote
       │  (surface fees + fill time to user)
       ▼
chaingpt_dex_approve_tx token=<inputToken> spender=<spokePoolAddress from quote> acknowledgeMainnet=true
       │  (skip if inputToken is native — ETH/MATIC/etc.)
[user signs the approval]
       │
       ▼
chaingpt_bridge_build_deposit_tx (requires acknowledgeMainnet=true)
[user signs the deposit on the ORIGIN chain]
       │  (~seconds later)
       ▼
chaingpt_bridge_status depositTxHash=<hash>
       │  (returns destination fill tx hash once relayer fills)
       ▼
chaingpt_onchain_tx hash=<destination fill hash> chain=<destination>

Supported networks

Ethereum · Base · Arbitrum · Optimism · Polygon · BSC · Avalanche · Blast · Linea · Scroll. Any pair of these can be bridged.

Key behavior

Fee math: input − relay_fee − lp_fee = output. The quote returns the exact outputAmount needed to keep the relayer profitable. Don't modify it.
Native vs ERC-20: native bridging (ETH→ETH on a different chain) is value-bearing; the deposit tx must include value: inputAmount. ERC-20 sets value: 0 and uses the prior approval.
Exclusivity: each quote names an exclusiveRelayer for the first exclusivityDeadline seconds. Other relayers can fill after.
Fill deadline: defaults to 4 hours. If unfilled by then, the depositor can be refunded.

What this skill does NOT do

Read the full file on GitHub · 64 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

8d ago First seen · 64 lines · 99 tokens per session scan A 9d1104be9142

Subscribe to this mod's changes

bridge is a skill published in the GitHub repository ChainGPT-org/chaingpt-claude-skill (16 stars, last pushed 9d ago), licensed MIT. It adds 99 tokens to every session and 829 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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