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.
npx skills add ccashwell/evm-cortex --skill cctp-bridginggit clone --depth 1 https://github.com/ccashwell/evm-cortexWrote 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.
[](https://agentmods.dev/skills/ccashwell/evm-cortex/cctp-bridging)<a href="https://agentmods.dev/skills/ccashwell/evm-cortex/cctp-bridging"><img src="https://agentmods.dev/badge/skills/ccashwell/evm-cortex/cctp-bridging/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/ccashwell/evm-cortex/cctp-bridging"><img src="https://agentmods.dev/badge/skills/ccashwell/evm-cortex/cctp-bridging.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00073 | $0.06429 |
| Opus 5.5 | $0.00029 | $0.02572 |
| Sonnet 5.5 | $0.00015 | $0.01286 |
| Haiku 4.5 | $0.00007 | $0.00643 |
Grade A, and why
cctp-bridging scanned grade A with 1 finding 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 1mo 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
const res = await fetch(endpoint); How it starts
The opening of the file, as written. The whole thing — 698 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CCTP Bridging — Circle Cross-Chain Transfer Protocol
Architecture Overview
Cross-Chain Transfer Protocol (CCTP) enables native USDC transfers between chains through a burn-and-mint mechanism:
- Burn — USDC is burned on the source chain via
TokenMessenger.depositForBurn() - Attest — Circle's offchain attestation service observes the burn event and produces a signed attestation
- Mint — Fresh USDC is minted on the destination chain via
MessageTransmitter.receiveMessage()
This is not a lock-and-unlock bridge. USDC is destroyed on the source chain and recreated on the destination chain. There are no wrapped tokens, no liquidity pools, and no bridge TVL risk. Circle is the sole minter/burner.
CCTP V2 Improvements
CCTP V2 (launched 2025) introduced:
- Fast transfers — configurable finality levels allowing ~8-20 second transfers
- Hooks — arbitrary calldata execution on the destination chain after mint
- Per-message burn limits — higher single-transfer caps
- Additional chain support — Unichain, Sei, Linea, and others
Contract Addresses — CCTP V2
TokenMessenger (initiate burns on source chain)
| Chain | Mainnet Address |
|---|---|
| Ethereum | 0xBd3fa81B58Ba92a82136038B25aDec7066af3155 |
| Base | 0x1682Ae6375C4E4A97e4B583BC394c861A46D8962 |
| Arbitrum | 0x19330d10D9Cc8751218eaf51E8885D058642E08A |
| Optimism | 0x2B4069517957735bE00ceE0fadAE88a26365528f |
| Polygon PoS | 0x9daF8c91AEFAE50b9c0E69629D3F6Ca40cA3B3FE |
| Avalanche | 0x6B25532e1060CE10cc3B0A99e5683b91BFDe6982 |
MessageTransmitter (receive messages / mint on destination chain)
| Chain | Mainnet Address |
|---|---|
| Ethereum | 0x0a992d191DEeC32aFe36203Ad87D7d289a738F81 |
| Base | 0xAD09780d193884d503182aD4F75D113B9B6a7c79 |
| Arbitrum | 0xC30362313FBBA5cf9163F0bb16a0e01f01A896ca |
| Optimism | 0x4D41f22c5a0e5c74090899E5a8Fb597a8842b3e8 |
| Polygon PoS | 0xF3be9355363857F3e001be68856A2f96b4C39Ba9 |
| Avalanche | 0x8186359aF5F57FbB40c6b14A588d2A59C0C29880 |
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.
- 1mo ago First seen · 698 lines · 73 tokens per session scan A ae72c14813c3
cctp-bridging is a skill published in the GitHub repository ccashwell/evm-cortex (131 stars, last pushed 17d ago), licensed MIT. It adds 73 tokens to every session and 6,429 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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