defi-onchain-analytics

name

defi-onchain-analytics

description

Use when profiling wallets, analyzing protocols or pools, inspecting token metrics, evaluating DEX liquidity or LP/vault performance, reading smart contract state, resolving proxy contracts and unknown interfaces, tracing exploit fund flows, or investigating on-chain incidents on EVM chains (Ethereum, Arbitrum, Base, BSC, Polygon, Katana). Make sure to use this skill whenever the user mentions on-chain data, RPC calls, blockchain analysis, DeFi positions, pool metrics, vault share prices, rebalancing events, contract storage, or LP performance — even if they don't explicitly ask for "on-chain analytics". Do NOT use for off-chain data, CEX analytics, or non-EVM chains.

DeFi On-Chain Analytics

Core Principle: 「先固定資料可信度與上下文，再做最小足夠的讀取，之後才做歸因與敘事。」 First fix data confidence and context, then do minimum sufficient reads, then do attribution and narrative.

Every analysis session serves this hierarchy: confidence > efficiency > interpretation.

Two-Layer Architecture

Every step is tagged with its required tier:

Tier	Tag	Requires	Free public RPC?
A	[CORE]	Standard JSON-RPC	Yes
B	[ARCHIVE]	Historical state >128 blocks	Rarely
C	[TRACE]	debug/trace namespace (Geth archive or Erigon)	No
D	[ENRICH]	External source (Etherscan API, Sourcify, 4byte)	Yes but not RPC

Default = Tier A only. Higher tiers are opt-in. If unavailable, disclose the gap — never silently skip.

Looped Workflow

Real investigations evolve — discovery changes the question. The workflow supports iteration, not just linear execution.

digraph phases {
  rankdir=LR;
  P0 [label="Phase 0\nScoping" shape=box style=filled fillcolor="#ffcccc"];
  P1 [label="Phase 1\nDiscovery" shape=box];
  P2 [label="Phase 2\nCollection" shape=box];
  P3 [label="Phase 3\nInterpretation" shape=box];
  P4 [label="Phase 4\nSanity Check" shape=box];
  P5 [label="Phase 5\nSynthesis" shape=box];
  Rescope [label="Rescope?" shape=diamond style=filled fillcolor="#ffffcc"];
  P0 -> P1 -> P2 -> P3 -> Rescope;
  Rescope -> P0 [label="new question\nemerged" style=dashed];
  Rescope -> P4 -> P5 [label="no"];
}

Why no skipping phases: Phase 0 prevents wasted RPC calls on wrong targets or wrong chains. A single eth_getLogs to the wrong address can eat your entire rate limit. Lock scope first, then query.

Scope Amendment (Re-entry)

When Phase 3 interpretation reveals a new analytical question that changes the objective, the investigation loops back to Phase 0 in amendment mode. Without strict rules, this loop degenerates into "ask again" — so the state machine below governs every re-entry.

Valid rescope triggers:

Trigger	Example
New unit of analysis discovered	Investigating a vault → found the strategy contract is the real subject
Objective fundamentally changed	Started with "is this vault profitable?" → discovered potential exploit
Chain expansion needed	Fund flow leads to a bridge contract → need to trace on source chain

NOT a rescope (handle in-phase):

Situation	Instead
Need more data on same target	Continue Phase 2 — add queries
Found unknown contract during analysis	Load contract-inspection.md via cascade trigger
Confidence too low on a finding	Apply Layer 5 (Confidence Deepening) — don't restart

Carry-forward rules: On rescope, the following are preserved unchanged unless explicitly overridden:

• Chain, anchor policy, anchor block, capability tier, RPC endpoint
• All existing evidence register entries
• All pattern files already loaded

Only these fields may change: target, objective, unit of analysis, hypothesis, timeframe, additional pattern files.

Completion criteria per mode:

Mode	Done when
🔍 Forensic	Root cause attributed with claim type + all fund hops traced to terminus or gap disclosed
📊 Due Diligence	All decision-critical metrics computed + gaps flagged
📈 Monitoring	Current state snapshot complete + health indicators evaluated
🏗️ Protocol Assessment	Key metrics + risk dimensions scored
🛡️ Security	Admin/upgrade/custody risk assessed + findings severity-ranked
🔭 Exploratory	Survey breadth covers user's question + open questions listed

Hard cap: Max 3 scope amendments per session. Beyond that, synthesize what you have and list remaining questions as Open Questions in Phase 5.

---

Phase 0: Scoping Gate — Active Consultation

This phase is a guided conversation, NOT a passive form. Read references/scoping-guide.md for detailed consultation techniques, depth/angle options, field-by-field asking guidance, and anti-patterns. Silently assuming scope details is the #1 cause of wasted RPC calls. Surface your assumptions as explicit questions.

Analysis Modes

Trigger	Mode	Emphasis
Suspicious activity / incident	🔍 Forensic	Fund flows, timeline, counterparties
Investment / trading decision	📊 Due Diligence	Risk, PnL, position health
Portfolio / position monitoring	📈 Monitoring	Current state, health indicators
Protocol evaluation / comparison	🏗️ Protocol Assessment	TVL, risk params, governance
Security review / audit prep	🛡️ Security	Admin keys, upgrades, custody
General curiosity / learning	🔭 Exploratory	Broad survey, teach as you go

If the user's request clearly maps to one mode, propose it rather than asking from scratch.

Required Fields

#	Field	Required?	Default
1	Target	Yes	—
2	Chain	Yes	—
3	Objective	Yes	—
4	Unit of analysis	Yes	—
5	Hypothesis	No	"Exploratory"
6	Timeframe	No	Per depth choice
7	Expected output	No	"Structured findings + narrative"
8	Data source policy	No	raw RPC only
9	Anchor policy	No	safe if supported
10	Capability tier	Auto	Probe-based
11	RPC endpoint	Auto	From references/rpc-endpoints.ts

Unit of analysis — Declare what object is being analyzed: wallet / contract / vault / pool / protocol / token. This prevents scope drift by making the analytical focus explicit. When the unit changes mid-investigation, that's a scope amendment trigger.

Anchor Policy Options

Policy	fromBlock	toBlock	Use Case
safe	—	safe tag	Default. Finalized, no reorg risk.
pinned	specific hex	specific hex	Reproducible snapshot at known block.
latest	—	latest tag	Real-time data, accepts reorg risk.
historical-scan	0 or contract creation block	safe	Full-chain event scanning. Each event gets its own timestamp via eth_getBlockByNumber. Use adaptive chunking (see references/rpc-field-guide.md Section 5).

Decision Dependencies

Some conditions — not just missing data sources — can flip the analytical conclusion entirely:

Condition	Impact	Without Checking
External rewards (Merkl, Angle, etc.)	LP/vault alpha reversal	Raw alpha appears negative when net return is positive
Vesting schedule + unlock events	Supply shock	Circulating supply appears stable when unlocks are imminent
Oracle staleness + backup fallback	Protocol health misjudged	Protocol appears healthy when oracle is stale
Provider endpoint inconsistency	Data conflict	Two endpoints return different logs for the same range — analysis built on partial data
Proxy upgraded during scan window	ABI/layout mismatch	Events decoded with wrong ABI; storage reads return garbage for blocks after upgrade
Unresolved bridge leg	Incomplete fund flow	Funds appear to vanish at bridge contract; actual destination chain not traced
Token/share conversion uncertainty	Value miscalculation	Vault share counted as underlying token; 1 share ≠ 1 token
Partial eth_getLogs coverage	Silent truncation	Provider hit result cap but returned no error; event history appears complete but is missing entries

If any decision-critical condition is unverified, flag it as: ⚠️ DECISION-CRITICAL GAP: [condition] unverified. Conclusion may reverse.

Blind Spot Disclosure

Before confirming, proactively flag what the analysis CANNOT see. See references/scoping-guide.md for templates.

Confirmation Gate

Present a structured summary before proceeding. Skipping confirmation risks running hundreds of calls only to discover you answered the wrong question.

═══ ANALYSIS PLAN ═══
🎯 Target: [address/protocol/token]
🔗 Chain: [chain]
📋 Objective: [clear restatement]
🔬 Unit: [wallet/contract/vault/pool/protocol/token]
🧪 Hypothesis: [if any, or "Exploratory"]
⏱️ Timeframe: [window]
📊 Output: [format]
⚡ Data policy: [Tier A / A+D / etc.]
⚓ Anchor: [safe / pinned / latest / historical-scan]
⚠️ Blind spots: [key limitations]
⚠️ Decision gaps: [decision-critical sources unavailable, if any]
Estimated effort: ~[N] RPC calls
═════════════════════

═══ ANALYTICAL CONTRACT ═══
⚙ Tier A baseline: [list the specific RPC calls that must be made before any Tier D source is used]
📜 Script trigger: [YES if any dependent flow / eth_getLogs scan / multi-hop trace is needed]
🔍 Root cause standard: Any causal claim sourced from Tier D only → tagged [UNVERIFIED] until Tier A/B corroboration
🧪 Claim typing: All major findings typed as FACT_ONCHAIN / INFERENCE_ONCHAIN / EXTERNAL_ASSERTION before Phase 4
═══════════════════════════

See references/scoping-guide.md for a filled-in example of the Analytical Contract.

Gate rules:

• User confirms BOTH the Analysis Plan AND the Analytical Contract before Phase 1 begins. If user says "just do it" → present the plan, then proceed.
• Auto-probe capability tier (Field 10) via test calls. Timeout/failure = assume Tier A.
• Auto-select RPC endpoint (Field 11): read references/rpc-endpoints.ts → pick top Tier S/1 → probe with eth_chainId → fallback on failure. For BSC, use endpoint with getLogs: true (Tier 1/2 only).
• Cross-chain check: If target involves bridges or multi-chain activity, flag and expand scope.
• Load relevant pattern file(s) based on objective (see Pattern Loading below).

---

Phase 1: Discovery

RPC-first. External metadata is enrichment, not baseline. The reason: Tier D labels drift and degrade over time. If you build conclusions on Tier D first, you have no way to detect when the label becomes wrong. Tier A data is immutable on-chain.

Step 1 — Contract Classification [CORE]:

1. eth_getCode(address) — EOA (empty) or contract?
2. If contract: eth_getStorageAt for EIP-1967 slots (implementation, beacon, admin)
3. Bytecode pattern match for EIP-1167 minimal clone
4. If proxy detected → read implementation → repeat on implementation

Step 2 — Interface Recovery [CORE] (mandatory for contracts):

When eth_getCode returns non-empty and EIP-1967 slots are non-zero, read references/abi-fetching.md for the full proxy resolution and selector extraction procedures.

If target is a proxy:

1. Resolve implementation address (EIP-1967 → beacon → bytecode → trace)
2. Attempt ABI recovery: Etherscan → Sourcify → 4byte → bytecode extraction
3. If no ABI found: Extract selectors from implementation bytecode, probe each via eth_call to classify return types. See references/proxy-resolver-scaffold.ts for a ready-to-use script.
4. Function selectors vary across implementations of the same protocol. getTotalAmounts() (0xd4789053) may not exist — the equivalent function could have a different name and selector (e.g., 0xc4a7761e). Always verify by probing the actual implementation. Never assume from documentation.

This step is not optional. For any contract beyond a standard ERC-20, interface discovery typically determines whether the investigation succeeds or fails. Skipping it means every subsequent eth_call is a guess.

Watch for same-address multiple roles: Some DeFi systems use a single contract as vault + share token + strategy router simultaneously. If the target serves multiple roles, document all interfaces discovered — don't stop at the first successful ABI match.

Step 3 — Address Context [CORE]:

• eth_getBalance, eth_getTransactionCount, eth_getStorageAt for owner/admin slots
• Lineage (deployer, creation tx): [ENRICH] — mark N/A in strict RPC mode

Step 4 — Source Bootstrap [ENRICH] (opt-in):

• Etherscan getsourcecode, Sourcify, 4byte.directory
• Entity labels → heuristic, confidence auto-downgraded

Tier D Precondition: Before using any Tier D source for a given finding, the equivalent Tier A query must already exist in the evidence register. Tier D enriches; it never substitutes. The reason: if the Tier D source is wrong or stale, you need the Tier A data to detect the discrepancy.

Output: Reconnaissance summary table. Every field tagged with source tier. Unavailable fields marked N/A (requires Tier X).

---

Phase 2: Data Collection

Rule: Block-anchor everything. Probe before assuming. Disclose gaps.

Read references/rpc-field-guide.md when choosing RPC methods or when eth_getLogs returns an error code. Load ABI references by objective: references/abis-core-tokens-vaults.md (tokens/vaults), references/abis-dex-v3-v4-clamm.md (Uniswap/Algebra CLAMM), and references/abis-proxy-and-multicall.md (proxy slots/Multicall3).

Tier 1 — Batch Reads [CORE]:

• Multicall3 or JSON-RPC batch, pinned to single block number
• Use for: balances, vault positions, pool reserves, oracle prices

Tier 2 — Event Logs [CORE]:

• Unbounded block ranges trigger provider-side timeouts or 10K result caps, silently truncating your event history. Always bound ranges.
• Adaptive chunking: probe provider limit, bisect on cap, paginate. See references/rpc-field-guide.md Section 5 for the algorithm and TypeScript template.
• Filter: address + topics[0] when possible; adapt for anonymous/factory scans

Tier 3 — Traces [TRACE] (opportunistic):

• callTracer(withLog:true) — internal calls + logs per frame
• prestateTracer(diffMode:true) — pre/post state diff
• trace_filter (Erigon) — address-range internal tx search
• Iron rule: If native ETH flow + Tier C available → traces mandatory. If unavailable → disclose: "Native ETH internal transfers not captured. Fund flow covers ERC20 only."

Tier 4 — State Override [TRACE]:

• eth_call with stateOverride / blockOverride for hypothesis testing
• Use stateDiff (merge) not state (wipe) unless intended. Accidental use of state zeros out all unlisted slots, producing garbage results.

Tier 5 — Specialized (probe first):

• eth_getProof [CORE], eth_getBlockReceipts [varies], eth_createAccessList [CORE]

Script generation decision:

Condition	Mode
Independent trivial reads (balance, nonce, single slot)	Inline curl
Any dependent / sequential calls	Generate TS script (viem)
Any eth_getLogs scan (any range)	Generate script
Multicall3 batch	Generate script
Multi-hop fund flow tracing	Generate script

Scripts must be self-contained, use viem, and runnable via bun run script.ts. Do not create package.json or install packages locally — bun auto-resolves npm imports from its global cache, leaving no artifacts in the working directory.

For bulk data collection (>100 RPC calls): Read references/data-collection-scaffold.ts — covers rate limiting, endpoint rotation, checkpoint/resume, and CSV output. This saves reinventing these patterns from scratch each time.

Scaffold: For incident forensics, start from references/forensic-script-scaffold.ts.

Execution discipline:

• Log purpose before every query
• Decode all hex inline — raw hex in output means the analysis is unreadable to the user
• Use fallback endpoints on failure
• Disclose when methods are skipped due to tier

Practical failure modes to watch for:

• Silent eth_getLogs truncation: Provider hit result cap but returned no error — event history appears complete but has gaps. Cross-check total event count against a second endpoint or block explorer if feasible.
• Endpoint disagreement: Two providers return different log counts for the same range. This typically means one hit an undocumented limit. Always note which endpoint was used per query.
• L2 timestamp mismatch: On OP Stack and Arbitrum, block.timestamp semantics differ from L1. Sorting by timestamp across chains without normalization produces incorrect chronology.
• Scan window crosses proxy upgrade: If the target contract was upgraded during your fromBlock→toBlock range, events before and after the upgrade may have different ABIs. Check Upgraded events on the proxy before scanning.

---

Phase 3: Interpretation

Read the relevant domain pattern file for analytical methods. Apply the Investigation Discipline protocol throughout this phase (see below and references/investigation-discipline.md).

Claim typing — mandatory for every major finding: FACT_ONCHAIN (proven by Tier A/B artifact) / INFERENCE_ONCHAIN (derived from Tier A/B) / EXTERNAL_ASSERTION (from Tier D — tag [UNVERIFIED] if used as root cause without Tier A/B corroboration). See Phase 3 Exit Gate in references/investigation-discipline.md.

Classification-first. Tag every finding before narrative:

Category	Source	Confidence	Min Tier
State-based	Storage, balances, rates	Highest	A
Flow-based (events)	Transfer/Swap events	High	A
Flow-based (traces)	Internal calls, native ETH	High	C
Label-based	Entity attribution	Medium (degrades)	D
Inferred	Patterns, correlation	Lowest	varies

Time-alignment: block number → tx index → log index → traceAddress

Mental models (in order):

1. Attribution hierarchy — state > flow > label > inference
2. Follow the money — traces if Tier C; events if Tier A (disclose native ETH gap)
3. Behavioral pattern matching — against domain reference patterns
4. MEV noise awareness — same-block buy+sell, tx index adjacency, known builders → flag
5. Entity clustering — shared funding, synchronized timing → "wallet" upgrades to "entity"
6. Anomaly flagging — rolling baseline if available; rule-based flags if no stable baseline

Tokenomics mandatory check:

Property	Impact	Detection
Rebasing	Balance changes without Transfer events	balanceOf delta without Transfer
Fee-on-transfer	Sent ≠ received	Transfer amount vs balanceOf delta
ERC-4626 shares	Share ≠ underlying	Read convertToAssets()
Wrapped staking	Conversion rate drifts	Read wrapper rate function

Scope amendment trigger: If interpretation reveals a new analytical question that changes the original objective, re-enter Phase 0 in amendment mode (see Scope Amendment above).

---

Phase 4: Sanity Check

Always-on checks:

• All reads anchored to same block / finality level?
• Internal txs accounted for (traces if ETH flow + Tier C)?
• Gaps disclosed if traces unavailable?
• Proxy vs implementation resolved?
• Labels cross-referenced, not blindly trusted?
• Off-chain blind spots acknowledged? (CEX internal, L2, OTC)
• Every finding tagged with tier dependency?
• Phase 3 Exit Gate passed? (claim typing, Dismissal Log, counter-hypotheses — see references/investigation-discipline.md)
• Blind Spot Audit completed? (Layer 4 — see references/investigation-discipline.md)
• Gap Log produced? (Layer 7 — every skipped method/source logged with reason and impact)
• Confidence-triggered deepening applied? (Layer 5 — no Medium-confidence significant findings left unaddressed)

Domain-specific pitfall packs — load based on Phase 0 objective. Full checklists in each pattern file.

---

Phase 5: Synthesis

Output profile determined by Phase 0 analysis mode. The reproducibility footer is always required — without it, nobody can verify or reproduce your findings.

Mode	Profile	Required Sections
🔍 Forensic	Full Evidence Grade	All 7: Findings, Narrative, Confidence Matrix, Visualization, Open Questions, Reproducibility Footer, Evidence Register
📊 Due Diligence	Performance Analysis	Findings + Benchmarks + Confidence Matrix + Open Questions + Reproducibility Footer
📈 Monitoring	Snapshot	Current State + Health Indicators + Alerts + Reproducibility Footer
🏗️ Protocol Assessment	Diligence Memo	Executive Summary + Key Metrics + Risk Factors + Reproducibility Footer
🛡️ Security	Security Report	Findings + Severity + Recommendations + Evidence Register + Reproducibility Footer
🔭 Exploratory	Survey	Findings + Narrative + Open Questions + Reproducibility Footer

Reproducibility footer format:

Chain / Anchor block / Anchor policy / RPC provider
Capability tier / Trace-enabled / Archive / External sources
Total RPC calls / Analysis timestamp

Evidence register (required for 🔍 Forensic and 🛡️ Security, recommended for others): Per finding: claim type (FACT_ONCHAIN / INFERENCE_ONCHAIN / EXTERNAL_ASSERTION), RPC method, params, block ref, cross-validation.

---

Pattern File Loading

Objective keywords	Load
wallet, address, PnL, whale, smart money, entity	patterns/wallet-analytics.md
TVL, protocol, risk, yield, pool, lending	patterns/protocol-analytics.md
token, holder, distribution, supply, vesting	patterns/token-analytics.md
DEX, swap, liquidity, LP, impermanent loss, volume	patterns/dex-analytics.md
vault, CLAMM, concentrated liquidity, share price, rebalance, LP performance	patterns/clamm-vault-analytics.md
contract, storage, events, proxy, upgrade, ABI	patterns/contract-inspection.md

Multiple files may load if objective spans domains. Reference files (references/) loaded on-demand during Phase 1-2. For incident forensics, references/forensic-script-scaffold.ts is the canonical starting script.

Cascade Triggers

During Phase 2-3, load additional patterns when the investigation reveals new dimensions:

Trigger (during analysis)	Load
Entities or wallets identified that need profiling	patterns/wallet-analytics.md
Unknown contract requiring ABI resolution	patterns/contract-inspection.md
Token supply or holder distribution analysis needed	patterns/token-analytics.md
Protocol-level risk or TVL assessment triggered	patterns/protocol-analytics.md
DEX swap or LP position analysis required	patterns/dex-analytics.md
Vault rebalance, share-price, or concentrated IL analysis	patterns/clamm-vault-analytics.md

Investigation Discipline — 7-Layer Defense

Read references/investigation-discipline.md for full methodology, DeFi-specific anti-rationalization phrases, iterative depth protocol, and adversarial self-review questions.

#	Layer	Rule	Active
1	Anti-Rationalization	Dismissal instincts are investigation signals. Wanting to say "probably normal" → investigate that exact thing deeper.	Always
2	Iterative Depth	Phase 3 runs multiple passes. Pass 2 (Forensic/Deep History): adversarial re-examination — "if this were malicious, what would the evidence look like?"	🔍🔴
3	Anti-Normalization	"Looks normal" is evidence of sophistication, not innocence. Adversarial actors design on-chain footprints to appear normal. "Too clean" = red flag.	Always
4	Blind Spot Audit	Phase 4 must list what was NOT investigated and what each gap could hide. Empty blind spot audit = failed Phase 4.	Always
5	Confidence Deepening	Confidence < High + significance ≥ Medium → additional query, cross-validation, OR explicit UNRESOLVED. No "Medium confidence, probably fine."	Always
6	Adversarial Self-Review	Per major finding: "What is the opposite interpretation?" + "What adjacent pattern does this obscure?" + "What would falsify this?" + "Does any other finding enable this?"	Always (documented in 🔍)
7	Gap Logging	Every skipped method/source logged with reason and potential impact. Silent omission = discipline violation.	Always

Banned Dismissal Phrases & Common Rationalizations

See references/investigation-discipline.md for the full list. The core rule: if you catch yourself wanting to dismiss a finding as "probably normal," that's an investigation signal, not a conclusion. Skipping Phase 0 "just for a quick check" is how wrong-chain queries happen.

Red Flags — STOP

These five signals indicate you're violating the workflow's core purpose. If any appear, stop and correct course:

• Making RPC calls before completing Phase 0 — you're guessing, not analyzing
• Using "latest" without explicitly choosing it — you're accepting reorg risk unconsciously
• Leaving raw hex values in output — your analysis is unreadable
• Querying eth_getLogs without bounded block range — you're risking silent truncation
• Dismissing a finding without asking "What would make this significant?" — you're rationalizing, not investigating