Open-Source Tool Tracks Live Crypto Price Spreads Across Five Major Exchanges

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A developer has released Crypto Arbitrage Monitor, a free open-source dashboard under the MIT license that tracks real-time bid/ask prices across Binance, Kraken, Coinbase, Bitget, and KuCoin. The tool computes fee-adjusted spreads across 50 cryptocurrency symbols and displays cross-venue arbitrage opportunities on a live dashboard. It pulls only public top-of-book market data, requiring no private API keys, and stores market preferences in a Postgres database. The application does not execute any trades and clearly labels all displayed values as indicative, noting it does not account for slippage, withdrawal fees, transfer times, or execution risk. The project is available on GitHub for anyone to deploy and use freely.

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Mautic 5 users can swap SMTP for Symfony Mailer DSN to improve email deliverability

Mautic 5, the open-source marketing automation platform, has moved from SwiftMailer to Symfony Mailer, enabling users to configure email delivery via a DSN string instead of traditional SMTP. MailKite, an email delivery service, offers a first-party Symfony Mailer transport that provides clearer error messages compared to generic SMTP responses. Users can install the transport via Composer, set an API key in the MAILER_DSN environment variable, and clear Mautic's cache to activate the new configuration. For managed Mautic hosts without Composer access, a standard SMTP fallback using MailKite credentials on port 587 with TLS is also supported. Successful delivery requires that all campaign sender addresses belong to domains with SPF and DKIM records properly configured.

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ProgrammingDEV Community ·

Why Automating a Legacy Windows Desktop App Required a Real Interactive Session

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ProgrammingDEV Community ·

How to Stop AI Tools From Generating Generic Web Designs

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ProgrammingDEV Community ·

Engineer Builds Full AWS Network in 90 Lines of Terraform Code

A developer has shared how a small Terraform project can provision an entire AWS network — including a VPC, two subnets, an internet gateway, a security group, and an EC2 instance — using just two commands. The setup replaces a tedious manual process of clicking through roughly fifteen AWS console screens, which often led to misconfigured route tables and connectivity failures. The project is organized across five files covering provider config, variables, core infrastructure, and outputs, making the setup fully reproducible. One subnet is configured as public with internet access via an internet gateway, while the second remains private and isolated. The author also highlights two specific pitfalls encountered during the build, aiming to help others avoid the same mistakes.

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