feat(onchain): replace paid Arkham lookup with a free multi-source aggregator#159
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Arkham costs ~$1K/10k requests. Replace the single paid adapter with a free,
provenance-tagged attribution aggregator that fans out in parallel and merges
by explicit precedence (never throws — failed sources just don't contribute):
tier 0 our wallets DB — OFAC sanctioned / ScamSniffer scam / curated
tier 1 MistTrack — OPTIONAL BYO-key (MISTTRACK_API_KEY): entity
label + AML risk (score/level); off → skipped
tier 2 DefiLlama — 7.6k protocols → name + category (free REST)
tier 3 Blockscout — open-source explorer: contract name, is-contract,
token info, public tags (REST v2, no key)
`onchain.lookup` agent tool now calls services/onchainLookup.ts. Return shape
stays backward-compatible (entityName/entityType/label/isContract/unattributed)
and adds riskScore/riskLevel/tags/sources[]. Deleted services/arkham.ts +
arkham.test.ts; ARKHAM_API_KEY no longer read (remove it from prod .env).
Verified live (no key): Uniswap router → Blockscout "UniswapV2Router02";
a DB scam address → DB-first wins (scamsniffer, conf 75) with Blockscout
corroborating; random EOA → unattributed, no throw. New onchain-lookup.test.ts
covers merge precedence + DB-wins + graceful-empty. gateway tsc + full api
suite green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
rinjanianalytics
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Jun 17, 2026
fix(onchain): wire BLOCKSCOUT_API_KEY (lost in the #159 merge)
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Why
Arkham costs ~$1K / 10k requests. This removes the paid dependency and replaces it with a free, provenance-tagged attribution aggregator.
How
onchain.lookupnow callsservices/onchainLookup.ts, which fans out to several sources in parallel and merges by explicit precedence. It never throws — a source that errors simply doesn't contribute (same graceful-degradation pattern asrag.search).confidence)MISTTRACK_API_KEY)riskScore/riskLevel; skipped if no keyReturn shape stays backward-compatible (
entityName,entityType,label,isContract,unattributed) so the agent tool + dashboard keep working, and addsriskScore,riskLevel,tags[], andsources[](provenance — which source said what). Attribution stays a claim: only our DB carries aconfidence.Removed
services/arkham.ts+arkham.test.tsdeleted.ARKHAM_API_KEYno longer read — delete it from the droplet.env(no rotation needed since the account is being cancelled).Verified live (no key)
UniswapV2Router02(contract)scamsniffer, conf 75) with Blockscout corroborating insourcesunattributed, no throwNew
onchain-lookup.test.tscovers merge precedence + DB-wins + graceful-empty. Gatewaytsc+ full api suite (69 files) green. No migration (reuseswallets).Next (separate PRs)
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