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Welcome to Blockline

Blockline is a professional MEV analytics API for Solana, providing deep insights into transaction context, front-running detection, and competitive intelligence for MEV teams and traders.

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What is Blockline?

Blockline, born from the soltop ecosystem, is a commercial-first product designed specifically for MEV analysis on Solana. It provides real-time and historical analysis of on-chain activity, helping you understand who traded before and after you, detect sandwich attacks, and gain competitive advantages in the MEV landscape.

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Key Features

Front-Running Detection

Analyze transactions within ±N slots of your trade to see who got in before you

Sandwich Attack Analysis

Detect MEV sandwich attacks by identifying matching signers before and after your transaction

PoH Tick Precision

Understand exact transaction ordering with Proof of History tick offsets

Transaction Context

See all market activity surrounding your trades with detailed metadata

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Quick Start

Get started with Blockline in three simple steps:
1

Get your API key

Sign up at blockline.soltop.sh and generate your API key from the dashboard
2

Make your first request

Use your API key to analyze a transaction and see who competed with you
3

Explore use cases

Learn advanced patterns like sandwich detection and competitive analysis

Start with the Quickstart Guide

Follow our quickstart guide to make your first API call

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Core Endpoints

Analyze Trade Context

Find all transactions that touched your market within ±N slots

Get Transaction Details

Retrieve detailed transaction information with validator metadata

Fetch Wallet Signatures

Get transaction history for any wallet with intelligent caching

Enhance Metadata

Enrich transactions with balance changes and financial details

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Use Cases

Blockline is designed for:
  • MEV Teams: Analyze competition, optimize strategies, detect attacks
  • Traders: Understand market microstructure and transaction timing
  • Researchers: Study MEV patterns and validator behavior
  • Developers: Build MEV-aware trading applications

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Authentication

All endpoints require API key authentication. Your API key should be included in the Authorization header: 
curl -H "Authorization: Bearer sk_live_YOUR_API_KEY" \
  https://api.soltop.sh/transaction/SIGNATURE
Get your API key from the Blockline Dashboard.

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Need Help?

API Reference

Explore all endpoints and their parameters

Use Cases & Patterns

Learn how to detect front-running and sandwich attacks

Code Examples

See practical examples in JavaScript and Python

Dashboard

Manage your API keys and subscription