# FillBench

> Reproducible, automatically-updated benchmarks for crypto trading tools and exchange APIs. We measure things bot builders actually care about (REST API latency, tail behavior, real cost to trade, US eligibility) from a fixed US East server, publish the raw data, and show our method.

FillBench is independent and reader-supported. Benchmarks are run on a schedule from one consistent vantage point so results are comparable over time. Raw data is downloadable and the method is documented.

## Datasets

- [Exchange API latency, latest run (JSON)](https://fillbench.com/data/latency-latest.json): p50/p95/p99/mean and TLS connect time per exchange, plus US-reachability probes, from the most recent run.
- [Exchange API latency, daily history (JSON)](https://fillbench.com/data/latency-history.json): daily p50 + p95 per exchange over time, one record per UTC day. Time series for trend analysis.
- [Real cost to trade, latest run (JSON)](https://fillbench.com/data/fees-latest.json): total one-way taker cost in basis points per US exchange (published base-tier fee + measured half-spread + order-book slippage) at $10k and $100k order sizes, from the most recent run.
- [Real cost to trade, daily history (JSON)](https://fillbench.com/data/fees-history.json): daily total-cost bps per exchange over time, one record per UTC day. Time series for trend analysis.
- [Real cost to trade SOL, latest run (JSON)](https://fillbench.com/data/fees-sol-latest.json): same total-cost-to-trade metric for Solana (SOL), a mid-cap where measured spread and slippage genuinely differ by venue, at $10k and $100k order sizes.
- [Real cost to trade SOL, daily history (JSON)](https://fillbench.com/data/fees-sol-history.json): daily total-cost bps per exchange for SOL over time, one record per UTC day.

## Benchmarks and guides

- [Best US Crypto Exchange (2026), Ranked on Measured Data](https://fillbench.com/best-us-crypto-exchange): every US-clear exchange ranked by measured real cost to trade and API latency, with US eligibility as a hard gate and an honest use-case pick (cheapest, best all-around, best for pros). Joins the cost and latency benchmarks; no bought placement.
- [Crypto Exchange API Latency, Benchmarked](https://fillbench.com/exchange-api-latency): measured keep-alive REST latency across 9 exchanges, ranked by p95 tail latency, with a US-eligibility column and a p95-over-time trend chart.
- [Real Cost to Trade BTC on US Exchanges](https://fillbench.com/exchange-fees): total one-way cost to market-buy BTC on 5 US exchanges, ranked cheapest first, combining published base-tier taker fee with live measured half-spread and order-book slippage at $10k and $100k.
- [Real Cost to Trade Solana (SOL) on US Exchanges](https://fillbench.com/exchange-fees-sol): the same measured cost-to-trade breakdown for SOL, a mid-cap pair where order-book depth (spread + slippage) differs meaningfully by venue, unlike deeply liquid BTC.
- [Coinbase vs Kraken API for developers](https://fillbench.com/coinbase-vs-kraken-api): SDKs, auth/signing, REST/WebSocket/FIX support, and rate limits compared from official docs.
- [Best Crypto Trading Bot for US Traders](https://fillbench.com/best-crypto-trading-bot-us): 3Commas vs Cryptohopper, tied to which US-legal exchange you can actually run on.
- [3Commas vs Cryptohopper](https://fillbench.com/3commas-vs-cryptohopper): trading-bot platform comparison.
- [Koinly vs CoinLedger](https://fillbench.com/koinly-vs-coinledger): crypto tax software comparison.

## Method and provenance

- [Methodology](https://fillbench.com/methodology): how each benchmark is run and why, so results are reproducible.
- [About](https://fillbench.com/about): who runs FillBench and how it stays independent.