What is match and append?

You send a customer file. GSDSI matches it against its own data and returns the fields you are missing, such as email, phone, postal address, demographics, or hashed identifiers.

How do I know the match rate before I buy?

Send a sample of your own file. GSDSI runs it and returns the result so you can measure match rate and field quality before licensing.

What can I send to match on?

Name and address, email, or phone, depending on the files in scope. The order form lists the input keys and the returned fields.

Are there limits on how I use appended data?

Yes. It is marketing data, not consumer-report data, so it cannot be used for credit, employment, insurance eligibility, or tenant screening.

Match & Append Services: Batch and Real-Time

Q: Can appends run in real time?

Yes, for scoped programs. A real-time API takes one input, such as a phone number, and returns the matched person and the fields in scope. Each program is scoped individually and starts with a test.

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Overview

GSDSI matches a customer file against its own data and returns the fields you are missing. In batch, a buyer sends names, addresses, emails, or phone numbers and receives appended email, phone, postal address, demographic, and hashed-identifier fields. For programs that need an answer while a record is in motion, GSDSI also supports real-time appends through an API, such as resolving a phone number to a person. A matched sample on your own file shows the match rate before you license anything.

Need an API key + JSON sample?

For technical evaluation, we can provide a sample payload, schema notes, and delivery options (S3/SFTP/Snowflake) aligned to your workflow.

Request API key + JSON sample Developer hub

Data Types

Email append
Phone append
Postal address update
Demographic append
Hashed-identifier (MAID and hashed email) match
Real-time API append

Delivery Formats

CSVTXTParquetAPI

Key Features

Batch file append
Real-time API append
Match test on your own file
Hashed-identifier output

Sample fields

A representative slice of the Match & Append Services schema. The data dictionary shared during evaluation lists every field with its type, nullability, join keys, and refresh cadence.

Field	What it contains
input_key	The field you send to match on, such as name and address, email, or phone.
match_status	Whether the input matched a record.
appended_fields	The fields returned for a matched record, as scoped in the order form.
hashed_email	Hashed email returned for privacy-safe onboarding, where scoped.

Batch Match and Append

In a batch append the buyer sends a file and GSDSI returns it with the agreed fields added. The match runs against GSDSI's consumer, email, phone, B2B, and identity files, depending on what the buyer sent and what the buyer needs back. Typical returns are an email address for a record that has only a name and postal address, a phone number for a record with no contact number, an updated postal address, and demographic or lifestyle attributes. Hashed outputs are available for buyers that onboard to digital platforms.

Real-Time Append API

Some programs cannot wait for a batch. A real-time append API takes one input, for example a phone number, and returns the matched person and the fields in scope while the interaction is still happening. Real-time programs are scoped individually, including the input keys, the returned fields, and the volume, and they start with a test so the buyer can see the match rate on live inputs.

How a Match Test Works

Send a sample of your own file. GSDSI runs it against the files in scope and returns the matched result, so you can measure the match rate and the quality of the appended fields before you license. Use a seed list you already know to check accuracy, not just coverage. Appended data is marketing data, not consumer-report data, and it must not be used for credit, employment, insurance eligibility, or tenant screening.

How buyers diligence match and append

Append buyers should measure match rate and field accuracy on their own seed list, and confirm which files each input is matched against.

Run a seed list you already know and measure match rate and accuracy of each appended field.
Confirm the input keys, the returned fields, and which GSDSI files each is matched against.
For real-time programs, test latency and match rate on live inputs at your expected volume.
Document permitted use, retention of your file, and hashed or raw output in the order form.

Request a Quote Sourcing methodology Request a matched sample

Match & Append Services