Smarty
Zipcodestack
PostalDataPI
Geoco.io
Melissa Data Quality
Loqate
usZIPCodes.org
REST API for US ZIP, ZIP+4, and Canadian postal codes. Single unified endpoint covers address validation and standardization, radius search (centroid haversine and true spatial polygon intersection), point-to-point distance, autocomplete/typeah

Fireblocks
Request Finance
Paybear
Payercoins
TrustCheck
Security-first stablecoin payout verification layer for wallet ownership, network and asset matching, mismatch detection, and audit trail.

Which is more popular?
Website, pricing, platforms and company facts side by side.
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ZIP
ZIP Code API
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|---|---|---|
| Website | zip-codes.com | payeeproof.com |
| Company | Startup from the United States · 2026 | — |
| Listed in |
In their own words, as submitted to SaaSHub.

API for US ZIP, ZIP+4, and Canadian postal code data. One unified endpoint set covers North America — no separate APIs by country or data type. What it does Address validation and standardization — production-grade parser with ZIP+4 append, refreshed monthly Radius search — centroid haversine and...
No description of PayeeProof yet.
What each product offers, as listed by its team.

Possible disadvantages
An editorial look at what each product does well and who it suits.

Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using ZIP Code API and PayeeProof. For example, how are they different and which one is better?
When comparing ZIP Code API and PayeeProof, you can also consider the following products.

Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.
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Fireblocks is an all-in-one digital asset custody, settlement, and transfer platform that is intended for institutions, providing secure transfer and storing of digital assets.
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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A suite of financial tools to make your life easier - crypto freelancers & organizations use Request Finance for invoices, expenses, payroll, and accounting.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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Easily accept 7+ cryptocurrencies in your shop or app.
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