{
 "generated": "2026-09-18",
 "provider": {
  "name": "Ethereum Signature Database (4byte.directory)",
  "slug": "4byte-directory",
  "category": "data_apis",
  "category_label": "Data & indexing",
  "url": "https://www.4byte.directory/",
  "pricing_url": "https://www.4byte.directory/",
  "capabilities": [
   "api.contract",
   "4-byte function selector lookup",
   "32-byte event topic lookup",
   "bulk scrape / self-host copy"
  ],
  "chains_note": "Chain-agnostic. Maps EVM 4-byte function selectors and 32-byte event topics back to human-readable signatures, so it applies to any EVM chain including Avalanche C-Chain and Robinhood Chain; it stores signatures, not chain state.",
  "chain_families": [
   "evm"
  ],
  "network_support": {
   "families": [
    "evm"
   ],
   "claims": [
    {
     "target": {
      "kind": "family",
      "id": "evm"
     },
     "status": "supported",
     "evidence": {
      "text": "Chain-agnostic. Maps EVM 4-byte function selectors and 32-byte event topics back to human-readable signatures, so it applies to any EVM chain including Avalanche C-Chain and Robinhood Chain; it stores signatures, not chain state.",
      "source_refs": [],
      "verified": true,
      "last_verified": "2026-09-18"
     }
    },
    {
     "target": {
      "kind": "network",
      "id": "avalanche-c-chain",
      "name": "Avalanche C-Chain",
      "family": "evm",
      "chain_id": 43114
     },
     "status": "supported",
     "evidence": {
      "text": "Applies to Avalanche C-Chain as it does to any EVM chain: the database maps function selectors and event topics, not chain state, so there is no per-chain coverage to verify.",
      "source_refs": [],
      "verified": true,
      "last_verified": "2026-09-18"
     }
    },
    {
     "target": {
      "kind": "network",
      "id": "robinhood-chain",
      "name": "Robinhood Chain",
      "family": "evm",
      "chain_id": 4663
     },
     "status": "supported",
     "evidence": {
      "text": "Chain-agnostic. Maps EVM 4-byte function selectors and 32-byte event topics back to human-readable signatures, so it applies to any EVM chain including Avalanche C-Chain and Robinhood Chain; it stores signatures, not chain state.",
      "source_refs": [],
      "verified": true,
      "last_verified": "2026-09-18"
     }
    },
    {
     "target": {
      "kind": "ecosystem",
      "id": "avalanche",
      "name": "Avalanche ecosystem",
      "family": "evm"
     },
     "status": "supported",
     "evidence": {
      "text": "Chain-agnostic. Maps EVM 4-byte function selectors and 32-byte event topics back to human-readable signatures, so it applies to any EVM chain including Avalanche C-Chain and Robinhood Chain; it stores signatures, not chain state.",
      "source_refs": [],
      "verified": true,
      "last_verified": "2026-09-18"
     }
    }
   ],
   "raw": {
    "chains_note": "Chain-agnostic. Maps EVM 4-byte function selectors and 32-byte event topics back to human-readable signatures, so it applies to any EVM chain including Avalanche C-Chain and Robinhood Chain; it stores signatures, not chain state.",
    "avalanche_support": "Applies to Avalanche C-Chain as it does to any EVM chain: the database maps function selectors and event topics, not chain state, so there is no per-chain coverage to verify."
   }
  },
  "capability_classes": [
   "index.selfhost"
  ],
  "capability_support": [
   {
    "raw": "api.contract",
    "class_ids": [],
    "status": "reported",
    "scope": "provider",
    "source_refs": [],
    "verified": true,
    "last_verified": "2026-09-18"
   },
   {
    "raw": "4-byte function selector lookup",
    "class_ids": [],
    "status": "reported",
    "scope": "provider",
    "source_refs": [],
    "verified": true,
    "last_verified": "2026-09-18"
   },
   {
    "raw": "32-byte event topic lookup",
    "class_ids": [],
    "status": "reported",
    "scope": "provider",
    "source_refs": [],
    "verified": true,
    "last_verified": "2026-09-18"
   },
   {
    "raw": "bulk scrape / self-host copy",
    "class_ids": [
     "index.selfhost"
    ],
    "status": "reported",
    "scope": "provider",
    "source_refs": [],
    "verified": true,
    "last_verified": "2026-09-18"
   }
  ],
  "freshness": {
   "band": "fresh",
   "age_days": 0,
   "last_verified": "2026-09-18",
   "as_of": "2026-09-18"
  },
  "status": "active",
  "promo_state": "none",
  "avalanche_support": "Applies to Avalanche C-Chain as it does to any EVM chain: the database maps function selectors and event topics, not chain state, so there is no per-chain coverage to verify.",
  "avalanche_flag": "c-chain",
  "access_model_raw": "key-free-public",
  "access_model": "key-free-public",
  "free_tier": "Entirely free and key-free, with 1,460,431 function and event signatures in the database as of 2026-09-18. The site states the data is given free of any license or restrictions on how it may be used.",
  "rate_limit": "No numeric limit published. The only stated restriction is that usage must not disrupt the service; scraping is explicitly permitted 'with limited concurrency', and heavy users are encouraged to host their own copy of the data.",
  "paid_from": "No paid tier.",
  "pricing_unit": "n/a (free, no billing)",
  "promos": null,
  "notes": "[2026-09-18] Added. Serves the EVM bytecode focus area as the long-standing selector-lookup dependency. No SLA and no published rate limit, so treat availability as best-effort; the site itself recommends self-hosting a copy for heavy use. The signature count (1.46M) is far below the Sourcify-rebuilt openchain successor (9.34M), which also covers error signatures.",
  "sources": [
   "https://www.4byte.directory/"
  ],
  "verified": true,
  "last_verified": "2026-09-18",
  "page": "/providers/4byte-directory.html"
 },
 "changes": [
  {
   "date": "2026-09-18",
   "provider": "Ethereum Signature Database (4byte.directory)",
   "type": "new-service",
   "title": "Ethereum Signature Database (4byte.directory) added to the tracker (data_apis)",
   "summary": "Newly tracked provider. Free tier: Entirely free and key-free, with 1,460,431 function and event signatures in the database as of 2026-09-18. The site states the data is given free of any license or restrictions on how it may be used. Rate limit: No numeric limit published. The only stated restriction is that usage must not disrupt the service; scraping is explicitly permitted 'with limited concurrency', and heavy users are encouraged to host their own copy of the data. Paid from: No paid tier.",
   "sources": [
    "https://www.4byte.directory/"
   ],
   "verified": true
  }
 ]
}