[REPLACE: SKILL_NAME]

A partially templated cryptocurrency price and trading-volume tracker. CoinGecko is a service that provides cryptocurrency market data.

In plain words
What is it for?
Use it as a starting point for fetching price, 24-hour change, and volume data, reading seven days of logs, and preparing anomaly alerts after replacing the template values.
Why use it?
It is intended to compare current data with recent history and identify unusually large movements, but its token and alert settings still contain placeholders.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/aeonfun/aeon/crypto-tracker
Any agent
npx skills add aeonfun/aeon --skill crypto-tracker
Clone the repo
git clone --depth 1 https://github.com/aeonfun/aeon

Made for: Claude Code, Codex.

Per session 34 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 826 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5 $0.00034 $0.00826
Opus 5 $0.00017 $0.00413
Sonnet 5 $0.00007 $0.00165
Haiku 4.5 $0.00003 $0.00083

Measured 2d ago against content hash ba349bc6aa5e, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

[REPLACE: SKILL_NAME] 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 2d 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 -sf -H "x-cg-pro-api-key: $COINGECKO_API_KEY" "$URL" > .token-cache.json
Origin

Copies of this mod

1 near-identical copy found in the catalogue:

docs/examples/skill-templates/crypto-tracker/SKILL.md · 61 lines

How it starts

The opening of the file, as written. The whole thing — 61 lines — stays where its author put it; the contents beside it link to each section on GitHub.

${var} — Optional. Pass a different CoinGecko ID to override the default. If empty, tracks the configured token.

Today is ${today}. Track [REPLACE: TOKEN_SYMBOL] price/volume and alert on anomalies.

Steps

  1. Fetch current state — query CoinGecko for the latest price, 24h change, 24h volume. Use COINGECKO_API_KEY if set, else the keyless endpoint:

    ID="${var:-[REPLACE: COINGECKO_ID]}"
    if [ -n "${COINGECKO_API_KEY:-}" ]; then
      URL="https://pro-api.coingecko.com/api/v3/simple/price?ids=$ID&vs_currencies=usd&include_24hr_change=true&include_24hr_vol=true"
      curl -sf -H "x-cg-pro-api-key: $COINGECKO_API_KEY" "$URL" > .token-cache.json
    else
      URL="https://api.coingecko.com/api/v3/simple/price?ids=$ID&vs_currencies=usd&include_24hr_change=true&include_24hr_vol=true"
      curl -sf "$URL" > .token-cache.json
    fi
    

    If a curl GET is flaky, use WebFetch on the same URL as a fallback (there is no network sandbox — WebFetch is just a convenience for flaky public reads).

  2. Read prior state — last 7 days of memory/logs/YYYY-MM-DD.md for previous prices and volumes (parse lines like **[REPLACE: TOKEN_SYMBOL]**: price=$N, volume_24h=$N).

  3. Detect anomalies — flag if |price_change_24h| >= [REPLACE: ALERT_THRESHOLD_PCT]% OR if 24h volume is >= 2x the 7-day median.

  4. Write output/articles/[REPLACE: SKILL_NAME]-${today}.md with:

    • Current price, 24h change, 24h volume
    • 7-day price chart (sparkline as ▁▂▃▅▇ characters)
    • Anomaly verdict: QUIET / STEADY / ANOMALY (and which fired)
    • Links: CoinGecko page, Etherscan / explorer page if you know the contract address
  5. Notify — if ANOMALY, send via ./notify with the verdict + 1-2 sentences of context. Stay silent on QUIET/STEADY days.

  6. Log — append to memory/logs/${today}.md:

    ## [REPLACE: SKILL_NAME]
    - **[REPLACE: TOKEN_SYMBOL]**: price=$N, change_24h=$N%, volume_24h=$N
    - **Verdict**: QUIET | STEADY | ANOMALY:price | ANOMALY:volume
    

Read the full file on GitHub · 61 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.

  1. 2d ago First seen · 61 lines · 0 tokens per session scan A ba349bc6aa5e

Subscribe to this mod's changes

[REPLACE: SKILL_NAME] is a skill published in the GitHub repository aeonfun/aeon (706 stars, last pushed 2d ago), licensed MIT. It adds 34 tokens to every session and 826 once invoked, about $0.0002 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 2026-08-30.

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