PostalDataPI
Smarty
Melissa Data Quality
Ahrefs
SEMRush
Moz
Serpstat
SE Ranking
Surfer SEO
SEO PowerSuite
Ubersuggest
PostalDataPI is a global postal code validation and enrichment API covering 240+ countries and territories. One API, one key, one flat rate โ $0.000028 per query with no tiers or subscriptions.
What you get back: Up to 18 metadata fields per postal code โ city, state/region, coordinates, timezone, three levels of administrative hierarchy, elevation, and more. Sub-5ms cached responses.
Works everywhere: US ZIP codes, UK postcodes, German PLZ, Japanese postal codes, Canadian FSAs, and 230+ more. Format normalization handles case, spacing, and hyphen variations automatically.
Get started in 60 seconds: 1,000 free queries on signup, no credit card required. SDKs for Python and Node.js. MCP server for AI agents (Claude, Cursor, etc.).
Built for developers: REST API, consistent JSON responses across all countries, OpenAPI spec, llms.txt for AI agent discovery.
Ahrefs is trusted by SEOs and marketing professionals worldwide as the ultimate toolset for SEO, powered by industry-leading data. Ahrefs crawls the web, stores tons of data and makes it easily accessible via a simple user interface. The data can be used to aid keyword research, link building, content marketing and SEO strategies. Ultimately, the tool helps to accelerate the growth of organic search traffic to a website.
PostalDataPI AhrefsI've enjoyed using Ahrefs to inform content creation due to their keyword explorer being so useful for finding low difficulty keywords. I do prefer the legacy version of their site explorer in comparison to the new format so I hope that they do not retire certain elements of the platform.
Based on our record, Ahrefs seems to be more popular. It has been mentiond 123 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Marketing-led growth (MLG) involves extensive marketing initiatives to drive customer acquisition, retention, and expansion. Brands such as HubSpot and Ahrefs have found success with MLG by leveraging large content libraries to generate interest in their products. - Source: dev.to / 4 months ago
Ahrefs provides industry-leading backlink analysis alongside powerful content research capabilities that help WordPress sites build authority. Site Explorer reveals your complete backlink profile while identifying link-building opportunities through competitor analysis. Content Explorer surfaces top-performing articles in any niche, showing what earns links and engagement. - Source: dev.to / 7 months ago
Domain Rating is a proprietary metric developed by Ahrefs that measures the strength of your website's backlink profile. - Source: dev.to / about 1 year ago
Iโve manually reviewed dozens of these winners using Ahrefs, SERP screenshots, and side-by-side structure comparisons. And patterns started to emerge โ repeatable markers of content that works, even if it was AI-assisted. - Source: dev.to / about 1 year ago
Iโve been using the most excellent ARefs site to get information about how good the on-page SEO is for many of my sites. Every couple of weeks, ARefs crawls the site and will give me a list of suggestions of things I can improve. And for a long time, I had been putting off dealing with one of the biggest issues โ because it seemed so difficult. - Source: dev.to / about 1 year ago
Smarty - Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Melissa Data Quality - Melissa helps companies to harness Big Data, legacy data, and people data (names, addresses, phone numbers, and emails).
Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.
