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README.md

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+---
+license: cc-by-nc-4.0
+tags:
+- ethereum
+- evm
+- blockchain
+- cryptocurrency
+- crypto
+- onchain-data
+- tabular
+- timeseries
+- datasets
+- pandas
+- polars
+- duckdb
+pretty_name: BlockDB Swap Prints - Sample
+size_categories:
+- 10M<n<100M
+---
+
+## Sample Notice
+
+This dataset contains **a small sample** of the full BlockDB Swap Prints dataset.  
+It is provided **for evaluation, research, and interoperability testing only**.
+
+If you need full historical coverage, real-time streaming, or end-of-day (EOD) exports
+please contact us directly:
+
+📧 **support@blockdb.io**  
+🌐 https://www.blockdb.io  
+
+
+## Dataset Overview
+Executed swap "prints": realized price from actual swap events. Each row represents a single swap execution with directional token pair (token_in → token_out), amounts, and computed execution price. No liquidity or quote data—only realized trades.
+
+
+## Chains and Coverage
+ETH, BSC, Base, Arbitrum, Unichain, Avalanche, Polygon, Celo, Linea, Optimism (others on request).
+Full history from chain genesis; reorg-aware real-time ingestion and updates.
+
+
+## Schema
+List of columns exactly as delivered:
+
+	•	id BIGINT – Unique swap print identifier (primary key)
+	•	pool_uid BYTEA – Unique pool identifier (FK to liquidity_pools)
+	•	exchange_id INTEGER – Exchange/DEX identifier
+	•	type_id INTEGER – Pool type identifier (FK to liquidity_pool_types)
+	•	block_number BIGINT – Block when the swap was executed
+	•	block_time TIMESTAMPTZ – UTC timestamp when the block was mined
+	•	tx_index INTEGER – Transaction index within the block
+	•	log_index INTEGER – Log index within the block
+	•	token_in BYTEA – 20-byte address of input token
+	•	token_out BYTEA – 20-byte address of output token
+	•	amount_in NUMERIC(78,0) – Raw input amount (lossless)
+	•	amount_out NUMERIC(78,0) – Raw output amount (lossless)
+	•	exec_price NUMERIC(78,18) – Realized execution price (token_out per 1 token_in, decimals-adjusted)
+	•	exec_price_exact TEXT – Lossless exact price representation
+	•	_tracing_id BYTEA – Tracing ID of this swap print record
+	•	_genesis_tracing_ids BYTEA[] – Tracing IDs of the genesis records leading to this record
+	•	_parent_tracing_ids BYTEA[] – Tracing IDs of the parent records leading to this record
+	•	_created_at TIMESTAMPTZ – Record creation timestamp
+	•	_updated_at TIMESTAMPTZ – Record last update timestamp
+
+
+### Notes
+	•	Direction: The "print" is token_in → token_out; exec_price = amount_out / amount_in (decimals-adjusted).
+	•	Unique constraint: (pool_uid, token_in, token_out, block_number, tx_index, log_index) guarantees one print per swap log per direction.
+	•	exec_price may be NULL for extreme values; exec_price_exact is always populated.
+	•	Indexes on (pool_uid, block_number DESC, tx_index DESC, log_index DESC), (block_number, tx_index, log_index), block_time, and (token_in, token_out, block_time DESC) support fast lookups.
+
+
+## Lineage
+Each swap print record includes deterministic _tracing_id, _genesis_tracing_ids, and _parent_tracing_ids, providing:
+
+	•	Provenance tracking from raw logs to decoded swap events
+	•	Reproducible analytics and signal extraction
+	•	Cross-system consistency checks (RPC vs. indexers vs. internal warehouses)
+
+
+## Common Use Cases
+	•	Building trade-level analytics and execution quality metrics
+	•	TWAP/VWAP calculation from realized trades
+	•	MEV detection and sandwich attack analysis
+	•	Arbitrage opportunity identification across pools
+
+
+## Quality
+	•	Verifiable lineage: deterministic cryptographic hashes per row
+	•	Reorg-aware ingestion: continuity and consistency across forks
+	•	Complete historical coverage: from chain genesis to present

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