postcoder.com

What It Is

Postcoder is a customer data validation service from Allies Computing. It provides global address lookup, bank account, email, mobile number, and SMS OTP verification for websites and mobile apps. It is not positioned as a general-purpose developer platform; instead, it is designed to be embedded into form flows such as registration, checkout, donations, account opening, and follow-up processes to reduce user input and improve data accuracy.

Core Capabilities and Developer Experience

Its feature coverage is fairly comprehensive: address autocomplete, address/postcode lookup, reverse geocoding, UK sort code and account number validation, email deliverability checks, mobile network status verification, and OTP sending and verification. The API is called with a key, returns JSON, and also provides operational endpoints such as status and creditsabovethreshold. The documentation is solid, with a Quick start, API reference, Sample code, Credit costs, Troubleshooting, and API key security sections. Examples cover JavaScript, Python, PHP, and C#, and there is also a CodePen demo. On the security side, it supports rate limiting, trusted IPs, trusted website URLs, and optional 2FA in the dashboard.

Pricing

The captured content shows a 30-day free trial with no credit card required, including 300 credits. A standard UK address lookup costs about 2 credits, allowing around 150 test lookups. After launch, users can buy credit bundles or set up a monthly plan, with prices starting from £27. Credit bundles do not require a subscription commitment. Different APIs consume credits at different rates; for example, email/mobile number verification costs 1.2 credits, while OTP sending costs 3.7 credits. The full tiered pricing was not present in the main text, so buyers should still check the pricing page or contact sales before purchasing.

Pros and Cons

The main advantages are its focused and practical coverage, especially for teams that want to integrate address, contact, and OTP validation through a single provider. The documentation and troubleshooting guidance are detailed, and the “get started in 15 minutes” path seems credible. The drawbacks are that there does not appear to be a self-hosted option, so it depends on a cloud API; some datasets or features need to be enabled; and the default limit of 5 requests per IP every 5 minutes may quickly trigger a 403 during testing or when calling directly from the frontend.

Best Fit and Access from China

Postcoder is suitable for ecommerce and retail, financial services and insurance, public-sector services, travel, automotive, and SaaS form-based products, especially teams that need UK/global address validation and UK bank account verification. The source text provides no evidence regarding access from mainland China, so this is rated as unknown; payment methods are also not specified. If your business is mainly in China, you may also want to evaluate Amap/Baidu Maps geocoding, domestic SMS providers, and local data validation solutions for Chinese address and mobile number use cases.