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 agentmods add instructions/bubilife1202/crossfin/agents-mdgit clone --depth 1 https://github.com/bubilife1202/crossfinWrote 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/instructions/bubilife1202/crossfin/agents-md)<a href="https://agentmods.dev/instructions/bubilife1202/crossfin/agents-md"><img src="https://agentmods.dev/badge/instructions/bubilife1202/crossfin/agents-md.svg" alt="Measured on agentmods" height="20"></a>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 | $0.01327 | $0.01327 |
| Opus 5 | $0.00664 | $0.00664 |
| Sonnet 5 | $0.00265 | $0.00265 |
| Haiku 4.5 | $0.00133 | $0.00133 |
Grade A, and why
crossfin AGENTS.md 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 3d 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.
curl https://crossfin.dev/api/health How it starts
The opening of the file, as written. The whole thing — 145 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md — CrossFin
What is CrossFin?
Cross-border crypto routing engine for AI agents. Routes capital across 14 Korean and global exchanges with x402 USDC micropayments on Base.
Architecture
apps/
api/ Hono on Cloudflare Workers — main API (x402, registry, routing, market data)
mcp-server/ MCP server (npm: crossfin-mcp) — 16 tools for Claude, Cursor, etc.
web/ React demo — local ledger UI
live/ Live demo site (live.crossfin.dev)
docs/ VitePress documentation (docs.crossfin.dev)
demo-video/ Remotion video generator
Key Files
apps/api/src/index.ts— All API routes (~11500 lines)apps/api/src/constants.ts— Exchange fees, bridge coins, routing configapps/api/src/types.ts— Type definitions and utility functionsapps/api/src/lib/fetchers.ts— Exchange data fetchersapps/api/src/lib/engine.ts— Routing engine logicapps/api/src/catalog.ts— Service catalog metadata (from catalog/crossfin-catalog.json)apps/mcp-server/src/index.ts— MCP server with 16 toolsapps/mcp-server/src/ledgerStore.ts— Local JSON ledger for agent wallets
API Base URL
Production: https://crossfin.dev
Endpoints Overview
- Free: health, exchange list, fees, pairs, status, arbitrage demo, routing graph, registry, ACP quote
- Paid (x402 USDC on Base): route finding ($0.10), kimchi premium ($0.05), orderbooks ($0.02), Korean stocks ($0.03-$0.05), bundles ($0.10-$0.20)
Discovery Endpoints
/.well-known/crossfin.json— CrossFin agent discovery/.well-known/x402.json— x402 payment discovery/.well-known/agent.json— Google A2A Agent Card/.well-known/ai-plugin.json— OpenAI plugin manifest/llms.txt— LLM-readable site map/api/openapi.json— OpenAPI 3.1 spec/api/docs/guide— Structured agent onboarding guide
Exchanges
Korea: Bithumb, Upbit, Coinone, GoPax Regional: bitFlyer (JPY), WazirX (INR), bitbank (JPY), Indodax (IDR), Bitkub (THB) Global: Binance, OKX, Bybit, KuCoin, Coinbase Bridge coins: BTC, ETH, XRP, SOL, DOGE, ADA, DOT, LINK, AVAX, TRX, KAIA, SUI, APT
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.
- 3d ago First seen · 145 lines · 1,327 tokens per session scan A 84ee18a9af23
crossfin AGENTS.md is an instructions file published in the GitHub repository bubilife1202/crossfin (1 stars, last pushed 6mo ago), licensed MIT. It adds 1,327 tokens to every session, about $0.0066 per session on Opus 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 2026-08-31.
Other instructions, from other repositories
coingecko-mcp-server AGENTS.md
AGENTS.md instructions for cyanheads/coingecko-mcp-server, covering developer protocol, what's next?, core rules, patterns and tool.
coingecko-mcp-server CLAUDE.md
Claude Code instructions for cyanheads/coingecko-mcp-server, covering developer protocol, what's next?, core rules, patterns and tool.
gotron-mcp CLAUDE.md
Claude Code instructions for fbsobreira/gotron-mcp, covering gotron mcp server, quick reference, architecture, adding a new tool and gotron sdk usage.
bitfinex-net
Use Bitfinex.Net when generating C#/.NET code that interacts with Bitfinex, including Spot, margin, derivatives symbols, funding, REST endpoints, WebSocket subscriptions, account management, market data, or order placement. Triggers on Bitfinex integration requests in C#, .NET, dotnet, F#, or VB.NET context.
flarestarter CLAUDE.md
Instructions for FlareStarter/flarestarter: This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
WhiteBit.Net copilot-instructions.md
Instructions for JKorf/WhiteBit.Net, covering copilot instructions for whitebit.net, use whitebit.net, not raw http, client setup, result handling and api structure.