post-grid-verify

name

post-grid-verify

description

PostGrid Verify is an address validation API that standardizes, verifies, and enriches postal addresses using global reference data, allowing developers and operations teams to improve deliverability, reduce returned mail, and maintain cleaner customer address records across applications and workflows. Read and write PostGrid Verify data through One: addverlists, addverlistscompletions, addressverifications, addresssuggestions, zipcodes, addverlistsparses and more, 11 actions with real parameter documentation. Use whenever the user asks to look something up in PostGrid Verify, create or update a record there, or build code against the PostGrid Verify API.

PostGrid Verify through One

PostGrid Verify is an address validation API that standardizes, verifies, and enriches postal addresses using global reference data, allowing developers and operations teams to improve deliverability, reduce returned mail, and maintain cleaner customer address records across applications and workflows.

One exposes PostGrid Verify through four MCP tools. The table below carries real action ids from One's knowledge base, so for a common operation you can skip search and go straight to reading the action's parameters.

How to run an action

1. Find the action in the table below, or call search_one_platform_actions with platform post-grid-verify if it is not listed.
2. Call get_one_action_knowledge with the action id. Do this every time, including for actions in this table. The table gives you the id, not the parameters.
3. Call execute_one_action with parameters copied from that knowledge.

Never guess a parameter name, a body field, or an enum value. The knowledge has the real schema, and a guessed field is either a 400 or a silent write of the wrong thing.

Before you start

Call list_one_integrations once and confirm PostGrid Verify is connected. If it is missing, the user has not connected it: say so and point them at https://app.withone.ai rather than reaching for raw HTTP.

Each connection carries an access field. If it reports {"policy": "methods", "methods": ["GET"]} the agent is read-only here, so plan a read-only answer instead of attempting a write that will be refused.

Before a write

Creates, updates, deletes and sends land on a real PostGrid Verify account and cannot be recalled. State the action and the specific target in one line before the first write in a task, and let the user stop you. Reads need no confirmation.

Actions

AddverLists

Action	Method	Path	Action id
List Lists	GET	/v1/addver_lists/	conn_mod_def::GLopuYM-CXA::WbGiL8uLSAWgMAnXfy3UmQ
Retrieve Addver List	GET	/v1/addver_lists/{{id}}	conn_mod_def::GLopuaRj7Cg::SwpOY1TKRMmz0o3OWvH1wQ
City States Lookup Using Addver Lists	POST	/v1/addver/city_states	conn_mod_def::GLopuhiU20g::B0eWn6A0R6msGSOcJMwL6w
Upload List Using Addver Lists	POST	/v1/addver_lists/	conn_mod_def::GLopuXvgwKA::KCnPiS5WQ5GgMawRk475FA

AddverListsCompletions

Action	Method	Path	Action id
Get Autocomplete Previews Using Addver Lists Completions	GET	/v1/addver/completions	conn_mod_def::GLopugLPwHA::OfroiZNSQxiDhPu9ZtKqWw
Completions Using Addver Lists	POST	/v1/addver/completions	conn_mod_def::GLopuXkd62g::8lpDmCgZQHqCOTD6phHvFQ

AddressVerifications

Action	Method	Path	Action id
Batch Verify Addresses	POST	/v1/addver/verifications/batch	conn_mod_def::GLopuYII4Og::xxa-6b3lQIC3WPZ2BOb0KQ

AddressSuggestions

Action	Method	Path	Action id
Suggest Addresses	POST	/v1/addver/suggestions	conn_mod_def::GLopufr0H-A::K5QlUp44TaCBYDuGCegtxg

ZipCodes

Action	Method	Path	Action id
Lookup ZIP Codes From US City/State	POST	/v1/addver/zip_codes	conn_mod_def::GLopuf7MPXg::JpQvUA1sSJSn8U_oHovAZA

AddverListsParses

Action	Method	Path	Action id
Parse an Address	POST	/v1/addver/parses	conn_mod_def::GLopuiFnnXg::5wppiFACSdiYwKP7usKR7g

AddressVerification

Action	Method	Path	Action id
Verify a Structured Address	POST	/v1/addver/verifications	conn_mod_def::GLopuo6-jSg::MWjrxtTmTNmhZ9PbiP2scw

When a call fails

The error comes from PostGrid Verify, not from One. A 400 or 422 means your parameters do not match the schema, so re-read the knowledge and fix the field. A 401 or 403 means the connection needs re-authorizing, which no retry will fix. A 404 means the id is not on this account. A 429 means slow down. Never retry a write more than once: the first attempt may have landed.

Full catalog: https://www.withone.ai/knowledge/post-grid-verify

Integration knowledge by One (withone.ai), licensed under One-Knowledge-1.0. Attribution must be preserved in derivative works.