Add dataset card

README.md

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+---
+license: cc-by-4.0
+language:
+  - en
+tags:
+  - blockchain
+  - ethereum
+  - evm
+  - stablecoin
+  - erc20
+  - usdc
+  - usdt
+  - dai
+  - blockdb
+  - parquet
+---
+
+# Stablecoin Transfers — Ethereum Cryptocurrency Data
+
+ERC-20 transfer events for USDC, USDT, and DAI on Ethereum mainnet.
+
+| | |
+|---|---|
+| **Chain** | Ethereum mainnet (`chain_id` 1) |
+| **Coverage** | `2017-11` → `2024-12` (UTC, by `block_timestamp`) |
+| **Tokens** | USDC, USDT, DAI |
+| **Format** | Parquet, Hive partitions `data/year=YYYY/month=MM/` |
+| **Source** | [BlockDB](https://www.blockdb.io) `blockdb0304_token_transfers_v1` |
+| **Schema** | [Token Transfers — data catalog](https://docs.blockdb.io/data-catalog/evm/transfers/token-transfers) |
+
+## Files
+
+```
+data/
+  year=YYYY/month=MM/part-NNNN.parquet
+```
+
+## Load
+
+```python
+import duckdb
+
+duckdb.sql("""
+  SELECT block_timestamp, from_address, to_address, token_address, amount_adj
+  FROM read_parquet('hf://datasets/BlockDB/Stablecoin-Transfers-Ethereum-Cryptocurrency-Data/data/year=2024/month=01/*.parquet')
+  LIMIT 10
+""")
+```
+
+## Need more than this snapshot?
+
+- **Filters, other tokens, or recent history** — [BlockDB Historic REST API](https://docs.blockdb.io/api-reference/overview/home).
+- **Real-time streams** — [BlockDB WebSocket feed](https://docs.blockdb.io/wss-reference/overview/introduction).
+- **Custom extracts** (anything we can derive from on-chain data) — [support@blockdb.io](mailto:support@blockdb.io).