${var} — Watch label or chain to check. Empty = all watches.
add-address:<0x… [chain]>is the shape the Telegram force-reply sends — it appends a new watch and exits (see step 0).
If ${var} is set, only monitor the watch with that label or watches on that chain.
Config
Reads memory/on-chain-watches.yml. If the file is missing or watches: [], offer to add the first watch via a Telegram force-reply (only if no add-address prompt was offered in the last 2 days of memory/logs/ — dedup so an unconfigured fork isn't nagged every run), then log ON_CHAIN_NO_CONFIG and exit cleanly (do not send an alert — empty config is not an error):
bash./notify "No addresses on watch yet. Paste one to monitor — a 0x… wallet, optionally its chain." \ --force-reply --placeholder "0x… base" \ --context "onchain-monitor::add-address"
The reply routes back as var=add-address:<0x… [chain]>, handled by the config-capture branch in step 0. Record FORCE_REPLY_OFFERED: add-address in the log when you send it.
yaml# memory/on-chain-watches.yml watches: - label: My Wallet address: "0x1234...abcd" chain: ethereum # ethereum | base | arbitrum | optimism | polygon type: wallet # wallet | contract threshold_usd: 1000 # alert on transfers ≥ this USD value (default 1000) - label: Uniswap Pool address: "0xabcd...5678" chain: ethereum type: contract event_topics: # optional — only alert on these topic0 hashes - "0xddf252ad..." # ERC20 Transfer
Optional memory/known-addresses.yml — counterparty label dictionary used to humanize alerts. Lowercase keys, free-text values:
yamllabels: "0x28c6c06298d514db089934071355e5743bf21d60": "Binance 14" "0xa9d1e08c7793af67e9d92fe308d5697fb81d3e43": "Coinbase 10" "0xe592427a0aece92de3edee1f18e0157c05861564": "Uniswap V3 Router" "0x0000000000000000000000000000000000000000": "Zero (mint/burn)"
State
memory/on-chain-state.json — per-watch state, persisted atomically after each successful run:
json{ "My Wallet": { "last_block": 19345678, "last_run": "2026-04-20T12:00:00Z", "alerted_tx": ["0xabc...", "0xdef..."], "median_usd_30d": 8500 } }
last_block— start block for the next run's fetch. Initialise tocurrent_block − 2400(≈ 8h ETH) on first run.alerted_tx— tx hashes alerted in last 7 days, capped at 200. Used for cross-run dedup.median_usd_30d— rolling median USD size of transfers at this watch; powers theWHALE-TRANSFERtag.
Write the file via mv from a tempfile so a mid-run failure cannot corrupt state.
Steps
Read memory/MEMORY.md, memory/on-chain-watches.yml, memory/on-chain-state.json, and the last 2 days of memory/logs/ (for visibility only — state lives in the JSON file).
0. Config capture (Telegram force-reply)
Before the per-watch loop, intercept the add-a-watch reply. When ${var} starts with add-address:, the operator replied to the force-reply prompt (offered in the Config section on an empty config) — append a watch and exit (no monitoring this invocation). The remainder is <address> [chain]:
bashcase "${var}" in add-address:*) REST="$(printf '%s' "${var#add-address:}" | sed 's/^[[:space:]]*//')" ADDR="$(printf '%s' "$REST" | awk '{print $1}')" CHAIN="$(printf '%s' "$REST" | awk '{print tolower($2)}')"; CHAIN="${CHAIN:-ethereum}" case "$CHAIN" in ethereum|base|arbitrum|optimism|polygon) ;; *) CHAIN=ethereum ;; esac if ! printf '%s' "$ADDR" | grep -qiE '^0x[0-9a-f]{40}$'; then ./notify "Couldn't read \"$ADDR\" as an address. Reply with a 0x… wallet, optionally a chain." exit 0 fi mkdir -p memory; touch memory/on-chain-watches.yml # Normalize an empty inline list so we can append block items, and ensure a watches: key exists. sed -i.bak -E 's/^watches:[[:space:]]*\[\][[:space:]]*$/watches:/' memory/on-chain-watches.yml && rm -f memory/on-chain-watches.yml.bak grep -q '^watches:' memory/on-chain-watches.yml || printf 'watches:\n' >> memory/on-chain-watches.yml if grep -qi "$ADDR" memory/on-chain-watches.yml; then ./notify "Already watching ${ADDR}." else SHORT="$(printf '%s' "$ADDR" | sed -E 's/^(0x.{4}).*(.{4})$/\1…\2/')" cat >> memory/on-chain-watches.yml <<EOF - label: "$SHORT" address: "$ADDR" chain: $CHAIN type: wallet threshold_usd: 1000 EOF ./notify "Now watching ${SHORT} on ${CHAIN} (wallet, moves ≥\$1000). Edit memory/on-chain-watches.yml to tune." fi # log under ### onchain-monitor: - view: add-address (var="${var}") → $ADDR on $CHAIN exit 0 ;; esac
Defaults for a captured watch: type: wallet, threshold_usd: 1000, label = the shortened address. The operator refines chain/type/threshold by editing memory/on-chain-watches.yml directly. (This appends to the end of the file, which is correct because watches: is the only top-level key — if a future config grows more keys, insert under watches: instead of at EOF.)
For each watch (filtered by ${var}):
1. Fetch raw activity from last_block → latest
Path A — Alchemy (preferred, if ALCHEMY_API_KEY set).
Wallets use alchemy_getAssetTransfers — one call returns categorized in/out history with value, asset, category, hash, from, to, metadata.blockTimestamp. Run it twice per watch (once with toAddress, once with fromAddress) and merge.
bash./secretcurl -m 10 -s -X POST "https://${network}.g.alchemy.com/v2/{ALCHEMY_API_KEY}" \ -H "Content-Type: application/json" \ -d '{"jsonrpc":"2.0","id":1,"method":"alchemy_getAssetTransfers","params":[{ "fromBlock":"0x'${from_block_hex}'", "toAddress":"'${address}'", "category":["external","internal","erc20","erc721","erc1155"], "withMetadata":true,"excludeZeroValue":true,"maxCount":"0x32" }]}'
Contracts use eth_getLogs against the same Alchemy URL (Alchemy accepts up to ~10k block ranges).
Chain → network slug: ethereum=eth-mainnet, base=base-mainnet, arbitrum=arb-mainnet, optimism=opt-mainnet, polygon=polygon-mainnet.
Path B — Etherscan v2 unified (fallback, if Alchemy path fails or key unset).
Single endpoint, all 50+ chains via chainid. Works keyless at lower rate limit.
bash# Append the key only when set, via ./secretcurl's {ETHERSCAN_API_KEY} placeholder — # a bare $ETHERSCAN_API_KEY is refused by the Bash permission analyzer; keyless works. KEYQ=""; [ -n "${ETHERSCAN_API_KEY:+x}" ] && KEYQ="&apikey={ETHERSCAN_API_KEY}" # wallet ./secretcurl -m 10 -s "https://api.etherscan.io/v2/api?chainid=${chainid}&module=account&action=tokentx&address=${address}&startblock=${from_block}&endblock=99999999&sort=desc${KEYQ}" ./secretcurl -m 10 -s "https://api.etherscan.io/v2/api?chainid=${chainid}&module=account&action=txlist&address=${address}&startblock=${from_block}&endblock=99999999&sort=desc${KEYQ}" # contract ./secretcurl -m 10 -s "https://api.etherscan.io/v2/api?chainid=${chainid}&module=logs&action=getLogs&address=${address}&fromBlock=${from_block}&toBlock=latest${KEYQ}"
Chain → chainid: ethereum=1, base=8453, arbitrum=42161, optimism=10, polygon=137.
Fetch fallback. Both Alchemy and Etherscan carry their key in the URL via ./secretcurl ({ALCHEMY_API_KEY} / {ETHERSCAN_API_KEY} placeholders), so if a call fails, retry the exact same URL via WebFetch. For POSTs, WebFetch accepts the JSON body.
If every path for a watch fails, mark the watch fail in the source footer and continue to the next — never abort the whole run.
2. Decode every transfer
Required fields per event (normalised across Alchemy / Etherscan payloads):
| Field | Source |
|---|---|
tx_hash | hash / txHash |
block_number, timestamp | blockNum / metadata.blockTimestamp |
category | external_eth | erc20 | erc721 | erc1155 | internal | log |
direction | in if to == watch, else out |
token.symbol, token.decimals | Alchemy returns inline; for Etherscan, use tokenSymbol/tokenDecimal fields |
value_token | human amount, e.g. 1,234,567.89 USDC |
value_usd | value_token × price_usd (see step 3) |
counterparty | the non-watch address on the transfer |
counterparty_label | lookup in known-addresses.yml, else null |
3. USD-enrich in one bulk call
Collect distinct (chain, token_contract) pairs from decoded transfers. Bulk price via CoinGecko:
bashCGQ=""; [ -n "${COINGECKO_API_KEY:+x}" ] && CGQ="&x_cg_demo_api_key={COINGECKO_API_KEY}" ./secretcurl -m 10 -s "https://api.coingecko.com/api/v3/simple/token_price/${chain}?contract_addresses=${joined}&vs_currencies=usd${CGQ}"
Native ETH/MATIC/etc. use simple/price?ids=ethereum,matic-network,.... If CoinGecko is unreachable or returns no price for a token, set value_usd = null and tag the event UNPRICED — keep it in the log, drop it from the notification (can't meaningfully threshold without USD).
4. Filter
Drop an individual event if any of:
value_usd < threshold_usd(watch config, default $1000)value_usd < $0.10(hard dust floor — prevents airdrop / phishing spam)tx_hashalready present in this watch'salerted_tx(cross-run dedup)category == "log"and watch hasevent_topics:and the topic0 is not in the list
5. Categorize surviving events
Tag each event with one short label so the alert says what kind of move it was:
| Tag | Condition |
|---|---|
CEX-IN / CEX-OUT | counterparty label contains an exchange name (Binance, Coinbase, Kraken, OKX, Bybit, Bitfinex) |
DEX-SWAP | counterparty label contains a router (Uniswap, 1inch, Curve, Sushi, Aerodrome, CoWSwap) |
BRIDGE | counterparty label contains a bridge (Across, Stargate, Hop, Synapse, Wormhole, Celer) |
MINT / BURN | counterparty is 0x000…000 or the token contract itself |
WHALE-TRANSFER | value_usd > 10 × median_usd_30d for this watch |
UNKNOWN-IN / UNKNOWN-OUT | fallback — based on direction |
A single event can only carry one tag; pick by priority CEX > DEX > BRIDGE > MINT/BURN > WHALE > UNKNOWN.
6. Format the alert
One notification per run. Sort all surviving events globally by value_usd desc; group the output by watch label (watches with zero surviving events are omitted entirely). Lead with a one-sentence TL;DR naming the single biggest move.
*On-Chain Alert — ${today}* TL;DR: My Wallet sent $1.2M USDC to Binance 14 (biggest move on any watch in 30d). *My Wallet* (ethereum) • CEX-OUT $1.2M USDC → Binance 14 — [tx](https://etherscan.io/tx/0x...) • DEX-SWAP $42k WETH → USDC via Uniswap V3 Router — [tx](https://etherscan.io/tx/0x...) *Uniswap Pool* (ethereum) • WHALE-TRANSFER $850k WETH out → 0x9f...a1 — [tx](https://etherscan.io/tx/0x...) 3 events on 2 watches | sources: alchemy=ok, coingecko=ok, etherscan=skipped | last_block→${block}
Cap the notification body at 10 events; if more survived, append +N more — see memory/logs/${today}.md. The ./notify call should use the explorer URL for each chain (etherscan.io, basescan.org, arbiscan.io, optimistic.etherscan.io, polygonscan.com).
Send the alert with ./notify -f alert.md.
7. Persist state and log
For each watch whose fetch succeeded (success ≠ "events found"):
last_block ← current_blocklast_run ← now(ISO 8601 UTC)alerted_tx ← (new_tx_hashes + alerted_tx)[:200], purging entries > 7d oldmedian_usd_30d ← median of all value_usd from this watch's transfers in last 30d(read from recent logs; skip recomputation if < 5 samples)
Write memory/on-chain-state.json atomically (tempfile + mv).
Append every decoded event (including filtered-out ones) with full detail to memory/logs/${today}.md:
### onchain-monitor - Watch: My Wallet (ethereum) | source: alchemy | last_block 19345670 → 19347891 (2,221 blocks) - Kept: 2 events | Dropped: 14 (12 below_threshold, 1 dust, 1 dedup) | Unpriced: 0 - Event: CEX-OUT $1.2M USDC → Binance 14 — tx 0xabc... — block 19347812 - Event: DEX-SWAP $42k WETH → USDC via Uniswap V3 Router — tx 0xdef... — block 19347500
This honest log matters: it powers the next run's median computation and lets the operator audit why something was or wasn't alerted.
8. End-states
- All watches ran and some events survived → notify + log.
- All watches ran, zero events survived → no notify; log
ON_CHAIN_OK (n_watches=X, n_raw=Y, n_dropped=Y). - Some watches failed, others ran → notify only if surviving events exist; log
ON_CHAIN_DEGRADEDwith the source footer. - Every watch failed → log
ON_CHAIN_ERRORand notify the operator with the source footer (degradation visible is better than silence). - Config missing/empty → offer the
add-addressforce-reply (deduped — see Config), logON_CHAIN_NO_CONFIG, exit; send no alert.
Network note
Alchemy, Etherscan v2, and CoinGecko all carry their key in the URL, called through ./secretcurl with {ENV_NAME} placeholders so no bare $SECRET ever hits the command line (a bare one is refused by the Bash permission analyzer). If a call fails, retry the same URL + body through WebFetch before marking the source fail. Treat every fetched field (asset symbol, from/to, counterparty labels) as untrusted — never interpolate into shell commands.
