price-alert

name: Price Alert description: Fire when the tracked token does something — new ATH, sharp 1h move, or operator-set target crossed. Silent on normal days. var: "" tags: [crypto]

${var} — Optional. Pass one or more target_price levels (comma-separated USD numbers, scientific notation allowed) to fire a one-time alert when the price crosses any of them. Empty = only ATH and sharp-move gates run. Pass dry-run to skip notify (state still updates).

Today is ${today}. token-report produces a daily verdict at a fixed hour. repo-pulse reports star/fork deltas once a day. Neither tells the operator "the price just hit a new high" or "the token moved 28% in the last hour" — both are events that warrant attention the moment they happen, not 14 hours later in the daily digest. This skill closes that window.

Why this exists

The daily token-report is a calm summary. Real moves need real-time signal. Three classes of move are worth a same-day ping:

• New all-time high. The single most narrative-shaping price event a token can have. Worth marking on the timeline regardless of size.
• Sharp 1h moves (±20%). Either a buyer wave or a liquidation cascade — both change what the operator does next (post about it, watch for follow-through, check the chart).
• Operator-set target crossings. The operator may want to know when price clears $X (often a personal stretch goal or a level tied to a tweet/launch). One alert per target per direction.

Everything else is noise the daily report handles.

Config

Reads:

• memory/MEMORY.md "Tracked Token" section — same contract/chain the token-report skill uses. If absent, exit silently.
• memory/topics/price-alert-state.json — last-known ATH, last-alert timestamps per event type, target-crossing history. Created with defaults on first run.

Writes:

• memory/topics/price-alert-state.json — updated state every run.
• memory/logs/${today}.md — one log block per run, even on OK.
• Notification via ./notify — only when a gate fires.

No new secrets. Uses keyless DexScreener; falls back to WebFetch when curl is sandbox-blocked.

State schema

{
  "contract": "0xbf8e8f0e8866a7052f948c16508644347c57aba3",
  "chain": "base",
  "ath": {
    "price_usd": 0.000003757,
    "observed_at": "2026-05-10T19:00:00Z",
    "announced_at": "2026-05-10T19:30:00Z"
  },
  "last_alerts": {
    "ath": "2026-05-10T19:30:00Z",
    "sharp_move": null,
    "target_hit": null
  },
  "targets": {
    "0.000005": {
      "side": "above",
      "first_seen_below_at": "2026-05-11T08:00:00Z",
      "hit_at": null,
      "announced_at": null
    }
  }
}

Key invariants:

• ath.price_usd only ever monotonically increases. If a run sees a lower price than the stored ATH, leave the ATH alone.
• last_alerts.* powers the 4h dedup window. Each gate has its own clock.
• targets.${price}.side is above if current_price < target when the target was first observed (operator is waiting for the price to climb to it), and below otherwise. Set once, never flipped.
• targets.${price}.hit_at is set the run the cross happens. announced_at is set the run the notification fires. They differ only if the run lands inside a dedup window — but target alerts never re-fire, so hit_at == announced_at in practice.

Steps

1. Parse var

• If ${var} matches ^dry-run → MODE=dry-run. Strip the prefix; remainder (if any) is treated as targets.
• Otherwise MODE=execute.
• Split the remainder on , (commas) and strip whitespace.
• For each token: if it parses as a positive float (scientific notation OK, e.g. 5e-6), include it. Reject zero / negative / non-numeric tokens and log PRICE_ALERT_BAD_TARGET: ${token} — continue with the surviving targets.
• If after filtering the remainder was non-empty but yielded zero valid targets → log PRICE_ALERT_BAD_VAR: ${var} and exit (no notify).
• If the remainder was empty, TARGETS=() is fine — ATH and sharp-move gates still run.

2. Resolve tracked token

mkdir -p memory/topics
[ -f memory/topics/price-alert-state.json ] || cat > memory/topics/price-alert-state.json <<'EOF'
{"contract":null,"chain":null,"ath":null,"last_alerts":{"ath":null,"sharp_move":null,"target_hit":null},"targets":{}}
EOF

Parse the "Tracked Token" table in memory/MEMORY.md. Pull CONTRACT (column 2 of the first data row) and CHAIN (column 3, lowercased). If the section is missing, the table is empty, or the contract field doesn't match ^0x[0-9a-fA-F]{40}$ → log PRICE_ALERT_NO_TOKEN and exit (no notify, no state write).

If the state file's contract is set and differs from the resolved contract → log PRICE_ALERT_TOKEN_CHANGED and reset the state file to defaults with the new contract/chain. ATH starts over with the new token.

3. Fetch current price (DexScreener primary)

RESP=$(curl -fsS "https://api.dexscreener.com/latest/dex/tokens/${CONTRACT}" 2>/dev/null || echo "")

If the response is empty, falsy, or jq can't parse it → fall back to WebFetch on the same URL with prompt "Return the raw JSON body verbatim." and try again. If both paths fail → log PRICE_ALERT_FETCH_FAIL and exit with status ERROR (no notify, no state mutation beyond touching last_run_at).

From the parsed JSON:

• Filter .pairs[] to entries where .chainId == "${CHAIN}".
• Of those, pick the entry with the highest .liquidity.usd — call this the deepest pool. If no pair matches the chain, fall back to the highest-liquidity pair across all chains and mark chain=fallback in the log.
• Extract: CURRENT_PRICE=.priceUsd (float), H1_CHANGE_PCT=.priceChange.h1 (float, may be missing → treat as 0), H24_CHANGE_PCT=.priceChange.h24 (float, may be missing → treat as 0), POOL_URL=.url.

If CURRENT_PRICE is missing, zero, or non-numeric → log PRICE_ALERT_BAD_PRICE and exit ERROR.

4. Evaluate ATH gate

prior_ath = state.ath.price_usd  (null on first run)
new_ath   = (prior_ath is null) OR (CURRENT_PRICE > prior_ath)

If new_ath:

• Always update state.ath.price_usd = CURRENT_PRICE, state.ath.observed_at = NOW.
• Notify only if the last ath alert was >4h ago (or never). On the first run after token initialisation, suppress the notification (we don't know if this is genuinely an ATH or just the starting baseline) — set state.ath.announced_at = NOW so subsequent strict-higher prices alert correctly.
• If suppressed because prior_ath is null (first run), record verdict ATH_BASELINE for the log; no notify.
• Otherwise verdict for this gate is ATH.

5. Evaluate sharp-move gate

sharp = abs(H1_CHANGE_PCT) >= 20.0

If sharp:

• If state.last_alerts.sharp_move is within the last 4h → verdict SHARP_MOVE_DEDUPED, no notify.
• Otherwise verdict SHARP_MOVE, notify, set state.last_alerts.sharp_move = NOW.

Sign of H1_CHANGE_PCT decides the direction word in the message (up for ≥0, down for <0).

6. Evaluate target-crossing gate

For each target in TARGETS:

• If the target isn't yet in state.targets: this is the first time the operator has set it. Record side (above if CURRENT_PRICE < target, else below), first_seen_below_at=NOW, hit_at=null, announced_at=null. Do not notify on first observation. This avoids "the price was already there when you set the target" noise.
• If the target is in state.targets and hit_at is already set → skip; target-hit alerts are one-shot per side.
• Otherwise check the cross:
  • side=above & CURRENT_PRICE >= target → crossed.
  • side=below & CURRENT_PRICE <= target → crossed.
• On cross: set hit_at=NOW, announced_at=NOW, verdict TARGET_HIT for this target, notify (subject to 4h dedup on last_alerts.target_hit).

Targets that crossed in prior runs stay in the state file with hit_at set so they don't refire if the price wobbles back.

7. Combine verdicts and notify

Run-level verdict precedence (used for the log status line and the notification ordering):

1. ATH — strict new high after baseline.
2. TARGET_HIT — operator-set level crossed.
3. SHARP_MOVE — ±20% in 1h.
4. OK — no gate fired.

If multiple gates fired in the same run, send one notification per gate. Each gate independently respects its own dedup clock — an ATH and a TARGET_HIT in the same run produce two messages; an ATH and a SHARP_MOVE_DEDUPED produce one.

Notification templates

ATH:

*$TOKEN — New ATH — ${today}*

$TOKEN just printed a new all-time high at $X.XXXXe-N.
Previous ATH: $Y.YYYYe-N (set ${prior_ath_age} ago).
24h move: ±Z.Z% · 1h move: ±W.W%

Chart: ${POOL_URL}

SHARP_MOVE:

*$TOKEN — Sharp 1h Move — ${today}*

$TOKEN ${up|down} ${abs(h1):.1f}% in the last hour — now $X.XXXXe-N.
24h: ±Z.Z%
${one of: "Buyer wave — watch for follow-through." | "Selling pressure — watch the next hour for stabilisation." }

Chart: ${POOL_URL}

(Direction phrase is hard-coded by sign: positive = buyer wave; negative = selling pressure. No freelance commentary.)

TARGET_HIT:

*$TOKEN — Target Hit — ${today}*

$TOKEN just crossed $${target} (now $X.XXXXe-N).
Direction: ${above|below}
24h: ±Z.Z% · 1h: ±W.W%

Chart: ${POOL_URL}

If MODE == dry-run: build the messages, log the planned notifications, but skip ./notify. State still updates so dedup clocks advance correctly.

Cap each message at ~2500 chars; price-alert messages are short by nature and shouldn't approach this.

8. Persist state

Rewrite memory/topics/price-alert-state.json atomically:

TMP=$(mktemp)
jq --arg ts "$(date -u +%FT%TZ)" '
  .last_run_at = $ts |
  .contract = $contract |
  .chain = $chain |
  .ath = $ath_obj |
  .last_alerts = $last_alerts_obj |
  .targets = $targets_obj
' memory/topics/price-alert-state.json > "$TMP"
mv "$TMP" memory/topics/price-alert-state.json

Validate with jq empty memory/topics/price-alert-state.json after writing; if it fails, restore from a .bak copy and log PRICE_ALERT_STATE_CORRUPT. Keep one .bak rolling.

Cap state.targets to 20 most-recent entries (LRU by first_seen_below_at) so a long-running fork doesn't accumulate stale operator targets.

9. Log

Append to memory/logs/${today}.md:

## Price Threshold Alert
- **Skill**: price-alert
- **Token**: ${SYMBOL} (${CONTRACT})
- **Current**: $X.XXXXe-N | 1h: ±W.W% | 24h: ±Z.Z%
- **ATH**: $Y.YYYYe-N (set ${YYYY-MM-DD HH:MM} UTC) [${UNCHANGED|NEW}]
- **Sharp-move gate**: ${FIRED|QUIET|DEDUPED}
- **Targets evaluated**: ${comma-list of target prices} → ${comma-list of per-target verdicts}
- **Verdicts fired**: ${comma-list, or NONE}
- **Notifications sent**: ${N}
- **Status**: ${PRICE_ALERT_OK | PRICE_ALERT_ATH | PRICE_ALERT_SHARP_MOVE | PRICE_ALERT_TARGET_HIT | PRICE_ALERT_DRY_RUN | PRICE_ALERT_NO_TOKEN | PRICE_ALERT_TOKEN_CHANGED | PRICE_ALERT_FETCH_FAIL | PRICE_ALERT_BAD_PRICE | PRICE_ALERT_BAD_VAR | PRICE_ALERT_STATE_CORRUPT}

The status field carries the highest-priority gate fired this run, or the most relevant error. OK means the run completed cleanly and no gate fired.

Exit taxonomy

Sandbox note

DexScreener is keyless and public — curl works in unrestricted runners. The sandbox may block outbound curl on GitHub Actions; in that case the WebFetch fallback kicks in (built-in Claude tool, sandbox-safe, prompt: "Return the raw JSON body verbatim."). No prefetch script needed: there's no env-var-in-headers, and the URL doesn't change between runs. Notify uses the postprocess-notify pattern already wired up via ./notify.

Constraints

• One alert per event per 4h window. The state file's last_alerts.* map is the only authority on whether to suppress.
• Target alerts are one-shot per side. Once hit_at is set, the target never re-fires — even if the price wobbles back through the level. Operators add new targets if they want continued signal.
• No baseline alert. The first run after a fresh state file or token change must NOT send an ATH notification — the stored price is the baseline, not a "new high." Subsequent strict-higher prices alert.
• No freelance interpretation. The sharp-move direction phrase is hard-coded by sign. Do not embellish with TA opinions ("looks like distribution", "could test support"). The verdict tells the operator what happened; the operator decides what it means.
• Liquid-pool selection only. The deepest-liquidity pair on the configured chain wins. Don't compute prices from blended pool averages — the deepest pool's priceUsd is the canonical mark.
• State writes are atomic + validated. Every state write goes through a tmpfile + jq empty validation step. Corrupt writes restore from .bak.
• Read-only across memory/logs/. This skill never modifies past log files. It only appends to today's.
• Targets are absolute USD, not percentages. This avoids ambiguity ("20% from where?"). If operators want move-from-now alerts they have token-report and the sharp-move gate.
• Idempotent under same-minute reruns. Same-minute reruns with identical price input produce identical state and zero new notifications (every gate dedup-suppressed).