Mempool API pending transactions & MEV across EVM chains
Skip running your own mempool node on every chain. We stream unconfirmed transactions — pending swaps, transfers and the live gas auction — over WebSocket, or fixed-cost Kafka on Enterprise, so you can act on a trade before it ever lands in a block.
Pick your latency. Same pending-tx data underneath.
Design your query once in GraphQL, then read the same pending-tx data over WebSocket or Kafka. For the mempool, latency is everything. Kafka is the fastest lane, at under 500ms on Enterprise. WebSocket is self-service, at about a second.
Enterprise fixed-cost topics with offset replay — never miss a pending tx, backfill on reconnect.
Browser-ready GraphQL subscriptions — subscribe to exactly the pending tx you filter.
The same schema for confirmed history — backtest and hydrate deep ranges on Enterprise.
Pending transactions on Ethereum, BNB Chain, Polygon and Tron.
A single EVM(mempool: true, network: eth) query reads the pending pool on a chain. Filter by sender, recipient, contract or method — and watch swaps, transfers and the gas auction as they form, before anything confirms.
The mempool is noisy, fragmented and per-chain — we already tamed it.
Reading pending transactions yourself means a full node with a wide-open txpool on every chain, custom decoding of calldata into real methods, and constant work to keep up with re-orgs and dropped tx — and it still stops at the chain boundary. We stream the decoded mempool to you over one schema, so you get pre-confirmation signal on Ethereum, BNB Chain and Polygon at once.
The mempool products people ship on us.
Each one is a filter on the same pending-tx firehose — subscribe over WebSocket, or use fixed-cost Kafka on Enterprise for the lowest latency.
Frontrun protection
Watch your wallet or contract for inbound pending tx that could front-run yours, and react — delay, bump gas or reroute — before they confirm.
Read the docs →MEV / arbitrage bot
Stream pending DEX swaps and rank them by gas price to spot sandwich and arbitrage opportunities the instant they hit the mempool.
Read the docs →Liquidation sniper
Monitor the mempool for pending transfers and lending-protocol calls that move a position toward liquidation, and queue your bid first.
Read the docs →What teams say about our data
"We did a thorough search of the market for the best onchain data. Bitquery came out on top — and now powers all live prices across Nansen. We don't think of them as a vendor. They're a partner."
Bitquery does the hard work of parsing blockchain transaction data into a usable form so that we don't have to. We use their interface to diagnose issues with complex transactions and their analytics as a starting point for our own.
They proved they had the technology to deliver sophisticated data solutions. We extended our support through the Binance X fellowship — building an open-source library of visualization widgets on their blockchain data.
The complex raw data is available at different levels of detail and from different viewpoints — whether we need simple aggregated transfers or parameters for failed contract calls. The support is responsive, friendly and quick.
Partnering with Bitquery has been highly cost-effective — leveraging their established infrastructure rather than building our own let us rapidly expand our blockchain support and reach a much broader segment of on-chain users.
Bitquery's products are very intuitive and easy to use. We currently use their products to obtain DEX-related trading and liquidity information, which saves us the manpower and tedious technical details required to develop our own system. Their excellent technical team deserves special praise; they provide near-24/7 support and resolve issues quickly. I greatly appreciate their products and work ethic.
Bitquery provides the infrastructure we rely on every day. Fast, reliable, and comprehensive across the chains that matter to our business.
Pricing
Start free. Scale when you ship.
Self-service plans cover 10 core chains with flat-rate add-ons: no surprise invoices. Every paid plan starts with a 7-day free trial.
Personal
For side projects, learning & testing. Personal use only, no commercial use.
billed annually ($348/yr) · save 41%
- 100k API points / mo ≈ 20k calls
- 30 req/min · 3 simultaneous
- Full GraphQL & REST schema
- Real-time data · 10 core chains 30-day trades · 8 hours to 4 days on-chain
- API only, no streams
- Community support
Pro
For trading bots, alerts & dashboards on live onchain and DEX data.
billed annually ($828/yr) · save 30%
- 1M API points / mo ≈ 200k calls
- 90 req/min · 6 simultaneous
- 100k stream-minutes + 5 GB
- 100 concurrent streams
- All streams onchain + mempool
- Commercial-use license
- Real-time data · 10 core chains 30-day trades · 8 hours to 4 days on-chain
- Community + Telegram support
Scale
For production real-time apps: every stream, scale on demand.
billed annually ($2,388/yr) · save 33%
- 5M API points / mo ≈ 1M calls
- 240 req/min · 12 simultaneous
- 2M stream-minutes + 50 GB
- 1,000 concurrent streams
- All streams onchain + mempool
- Commercial-use license
- Dedicated Slack support
Enterprise
Full history, unlimited streams & bulk delivery at scale.
flat platform fee, no metering
- Complete history · 25 chains
- Unlimited WebSocket streaming no stream-min or GB limit
- Custom points & rate limits
- Kafka fixed-cost · S3 bulk export
- Coinpath® money flow
- SLA · SSO · dedicated support
Flat-rate add-ons: $35 / 1M points on every self-service plan · $35 / 200k stream-minutes and $35 / 5 GB on Pro and Scale (bought yearly · save 30%). Billed only for what you add, with volume packs that cut the rate as you scale.
Historical data is sold separately: self-service plans are real-time only. Per-chain archive packs start at $100/mo ($70/mo billed yearly); transfers, balances & holders are $150/mo ($105/mo yearly) on most chains. EVM and Tron trading and transfers packs include calls and events. See historical add-ons →
Mempool & pending-tx questions, answered.
How do I get mempool data with Bitquery?
Which chains have mempool support?
Can I detect sandwich attacks?
How fast is the mempool stream?
Are pending DEX swaps decoded into methods?
How is this different from the DEX Trades API?
Ship your mempool product this week.
7-day free trial — pending transactions streamed over WebSocket, no node to run. Read the mempool before it confirms in your first call.