Ethereum History — Agent Skill

Ethereum History exposes read-only, factual data about historical Ethereum mainnet contracts. Use this skill when the user asks about:

• A specific contract address (what is it, when was it deployed, who deployed it, bytecode, decompiled code, documented history)
• Early Ethereum contracts, deployment era (Frontier, Homestead, DAO fork, etc.), or undocumented/notable contracts
• Contract facts: deployer, deployment block/timestamp, short description, historical summary, links, metadata

All endpoints are GET only. No authentication required. Responses are JSON with snake_case keys.

Base URL

• Production: https://ethereumhistory.com
• Manifest (full schema): GET {BASE_URL}/api/agent/manifest

Endpoints

1. Contract facts (one address)

GET {BASE_URL}/api/agent/contracts/{address}

Returns full factual data for one contract: address, era, deployer, deployment block/timestamp, runtime_bytecode, decompiled_code (when available), short_description, historical_summary, historical_significance, historical_context, token metadata, heuristics, links, metadata. Use when the user provides or asks about a specific contract address.

Example: GET https://ethereumhistory.com/api/agent/contracts/0xdbf03b407c01e7cd3cbea99509d93f8dddc8c6fb

2. Discovery (list contracts)

GET {BASE_URL}/api/agent/contracts

Query params (all optional):

• era_id — Filter by era (e.g. frontier, homestead, dao, tangerine, spurious)
• featured — true or 1 for featured contracts only
• undocumented_only — true or 1 for contracts with no short_description yet
• limit — Max 200, default 50
• offset — Pagination offset, default 0

Returns a list with minimal fields: address, era_id, deployer_address, deployment_timestamp, has_short_description, decompilation_success, etherscan_contract_name, token_name, token_symbol. Use for discovery; then fetch full facts via endpoint 1 if needed.

3. Temporal queries (by time range)

GET {BASE_URL}/api/agent/contracts?from_timestamp=...&to_timestamp=...

Query params:

• from_timestamp — ISO 8601 (e.g. 2015-07-30T00:00:00Z)
• to_timestamp — ISO 8601
• era_id, limit, offset — Same as discovery

Use when the user asks for contracts deployed in a date range or era.

Requests and responses

1. Contract facts — GET {BASE_URL}/api/agent/contracts/{address}

Request

• Path: address — Ethereum address (0x + 40 hex chars). Required.

Success (200)

{
  "data": {
    "address": "string",
    "era_id": "string | null",
    "era": { "id": "string", "name": "string", "start_block": number, "end_block": number | null, "start_date": "string", "end_date": "string | null" } | null,
    "deployer_address": "string | null",
    "deployment_tx_hash": "string | null",
    "deployment_block": number | null,
    "deployment_timestamp": "string | null",
    "runtime_bytecode": "string | null",
    "decompiled_code": "string | null",
    "decompilation_success": boolean,
    "code_size_bytes": number | null,
    "gas_used": number | null,
    "gas_price": "string | null",
    "heuristics": { "contract_type": "string | null", "confidence": number, "is_proxy": boolean, "has_selfdestruct": boolean, "is_erc20_like": boolean },
    "etherscan_contract_name": "string | null",
    "etherscan_verified": boolean,
    "source_code": "string | null",
    "abi": "string | null",
    "token_name": "string | null",
    "token_symbol": "string | null",
    "token_decimals": number | null,
    "token_logo": "string | null",
    "short_description": "string | null",
    "description": "string | null",
    "historical_summary": "string | null",
    "historical_significance": "string | null",
    "historical_context": "string | null",
    "verification_status": "string",
    "links": [{ "id": number, "title": "string | null", "url": "string", "source": "string | null", "note": "string | null", "created_at": "string" }],
    "metadata": [{ "key": "string", "value": "string | null", "json_value": unknown, "source_url": "string | null", "created_at": "string" }]
  },
  "meta": { "timestamp": "string (ISO 8601)", "cached": false }
}

Errors

• 400 — Invalid address format. Body: { "error": "Invalid Ethereum address format. Must be 0x followed by 40 hex characters." }
• 404 — Contract not found. Body: { "error": "Contract not found in our historical archive." }
• 500 — Server error. Body: { "error": "string" }

---

2. Discovery / temporal — GET {BASE_URL}/api/agent/contracts

Request (query params, all optional)

Success (200)

{
  "data": [
    {
      "address": "string",
      "era_id": "string | null",
      "deployer_address": "string | null",
      "deployment_timestamp": "string | null",
      "has_short_description": boolean,
      "decompilation_success": boolean,
      "etherscan_contract_name": "string | null",
      "token_name": "string | null",
      "token_symbol": "string | null"
    }
  ],
  "meta": {
    "timestamp": "string (ISO 8601)",
    "cached": false,
    "limit": number,
    "offset": number,
    "count": number
  }
}

When the database is not configured, response is still 200 with "data": [] and meta.message indicating discovery requires PostgreSQL.

---

3. Manifest — GET {BASE_URL}/api/agent/manifest

Request: None.

Success (200): JSON object with name, id, description, version, base_url, capabilities, endpoints, terms. See the live URL for full shape.

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Usage notes

• Read-only. No opinions or editorial stance. Data as documented on EthereumHistory.com.
• Factual only. What something is and is not. No hype or persuasion.
• When history (short_description, etc.) is not yet documented, contract facts still include runtime_bytecode and decompiled_code when available.
• For the full machine-readable manifest (capabilities, endpoints, terms), call GET {BASE_URL}/api/agent/manifest.