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

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 | payeeproof.com | zip-codes.com |
| Company | — | Startup from the United States · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.

No description of PayeeProof yet.
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...
What each product offers, as listed by its team.

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Overall verdict
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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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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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Easily accept 7+ cryptocurrencies in your shop or app.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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