NationBuilder
NationBuilder is a community-engagement and organizing platform for political campaigns, advocacy groups, nonprofits, and membership organizations, pairing a supporter CRM with a website/page builder, email and text messaging, event and petition tools, and integrated fundraising. Its developer surface is a REST API offered in two flavors: the current v2 API, which follows the JSON:API specification and authenticates with OAuth 2.0 (authorization-code with optional PKCE and refresh tokens), and a legacy v1 API that uses per-nation API tokens. The API exposes people/signups, donations, events, petitions, memberships, lists, tags, and related resources so integrators can sync supporter data and automate outreach. NationBuilder is multi-tenant: each nation is reached at its own {nation-slug}.nationbuilder.com host.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles NationBuilder the way a machine reads it — 46 machine-readable artifacts across 41 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — NationBuilder scores 48.6/100 (developing), with a separate agent-readiness read of 72/100 (agent native). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile NationBuilder
Each block below is one kind of artifact we hold for NationBuilder. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 41
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
NationBuilder Async Processes API
This endpoint is used to get information about deferred or asynchronous processes returned by other endpoints such as adding and removing signups from a list or tagging and unta...
NationBuilder Automation Enrollments API
AutomationEnrollments link signups to automations. Every AutomationEnrollment belongs to a single Signup and a single Automation. Further information on how signups are enrolled...
NationBuilder Automations API
Automations represent workflows where chains of actions and reactions can be created within a nation. Signups can be enrolled in an automation and are represented via the Automa...
NationBuilder Ballots API
Ballots are a record of an election and how a person voted for said election. Each ballot is associated with a voter and an election and contains information such as when the ba...
NationBuilder Broadcasters API
Broadcasters are the voices who speak publicly on behalf of your nation. All external communications are organized around broadcasters.
NationBuilder Contacts API
Contacts are logged interactions between people in your nation. More information about contacts and the fields found in the UI and API interfaces can be found [here](https://sup...
NationBuilder Custom Fields API
Custom fields are available for Signups and Donations. See [here](https://support.nationbuilder.com/en/articles/2340612-introduction-to-custom-fields) for more information.
NationBuilder Donation Tracking Codes API
Tracking codes are used to identify where a financial transaction came from. Users give the tracking code a custom name/slug and use the code to track where a donation was made....
NationBuilder Donations API
Currently we allow you to record existing donation transactions via API V2. These transactions will not be backed by any kind of financial transaction. See the [docs](https://su...
NationBuilder Elections API
Elections are available on nations with voter features enabled. See more information about election functionality [here](https://support.nationbuilder.com/en/articles/2362732-se...
NationBuilder Event Rsvps API
This resource is for creating, reading, updating, and deleting Event RSVPs. When creating event RSVPs, the rsvp must be given signup data, either by passing a first name, last n...
NationBuilder Event Ticket Levels API
This resource is for creating, reading, updating, and deleting ticket levels for events. manage the ticket levels available for the events. Ticket levels and their prices are di...
NationBuilder Events API
Resource used for managing event data associated with event pages. More details on events within NationBuilder can be found [here](https://support.nationbuilder.com/en/articles/...
NationBuilder Imports API
All kinds of data can be imported into a nation, when this happens we create an import resource as a record of the imported data. Each import has a type attribute defining the k...
NationBuilder Lists API
Lists are collections of signups. Often created from filters they are useful for grouping signups together by common attributes. They can be used to perform batch updates on sig...
NationBuilder Mailings API
Referred to as email blasts, mailings send bulk emails to a group of signups at once. Mailings belong to and are sent via a broadcaster. The recipients of a mailing can be selec...
NationBuilder Membership Types API
Membership types are used to identify memberships assigned to signups. A membership type has many memberships which are assigned a single signup. The only required attribute for...
NationBuilder Memberships API
A membership is a way to organize supporters and provide additional benefits based on actions they've taken or money donated. More information about memberships and the fields f...
NationBuilder Pages API
Pages are published on your site. Each page type offers different features, you can view them [here](https://support.nationbuilder.com/en/articles/2319593-types-of-nationbuilder...
NationBuilder Path Histories API
Documents a signup's step along a path journey.
NationBuilder Path Journey Status Changes API
Documents the status change of a path journey.
NationBuilder Path Journeys API
Path journeys are the relationship between signups and paths. Further information available [here](https://support.nationbuilder.com/en/articles/3055899-create-paths#create-a-pa...
NationBuilder Path Steps API
Path steps name the positions within a path a signup can be assigned to. Further information available [here](https://support.nationbuilder.com/en/articles/3055899-create-paths#...
NationBuilder Paths API
Paths store information about path journeys and steps. They are related to signups via path journeys. A path can be assigned many path journeys and path steps. Further informati...
NationBuilder Petition Signatures API
Petition signatures are the relationship between petitions and signups.
NationBuilder Petitions API
Petitions are pages on your site that can be signed and shared by your supporters. Learn more about them [here](https://support.nationbuilder.com/en/articles/2327303-create-a-pe...
NationBuilder Pledges API
Pledges are a promise from a signup to donate to your cause. These are not donations. Further information available [here](https://support.nationbuilder.com/en/articles/2344197-...
NationBuilder Precincts API
Precincts are districts used by political campaigns. Read more about them [here](https://support.nationbuilder.com/en/articles/2471652-creating-and-viewing-political-precincts).
NationBuilder Relationships API
Valid relationship types are ["affiliate-affiliate", "alum-school", "assistant-assisted", "board_member-organization", "candidate-committee", "chapter-parent", "child-parent", "...
NationBuilder Signup Profiles API
Profile information for a signup that can be displayed on a public site page. Read more on public profiles [here](https://support.nationbuilder.com/en/articles/2327657-how-publi...
NationBuilder Signup Taggings API
Signup taggings are the relation between a signup and a tag.
NationBuilder Signup Tags API
Tags are used to quickly identify signups by certain characteristics. They are related to signups through SignupTaggings. Read more about them [here](https://support.nationbuild...
NationBuilder Signups API
Signups store information about people in your nation. Further information available [here](https://support.nationbuilder.com/en/articles/8810042-how-records-are-added-to-the-pe...
NationBuilder Sites API
A site is how supporters interact with your nation. Each site has a theme and many pages that can be drafted and published later to be viewed publicly. Read more about sites [he...
NationBuilder Suggestion Boxes API
Suggestion boxes are containers for collecting suggestions from your community. They live on website pages, and define the settings, auto-responses, categorization tags, and mod...
NationBuilder Suggestions API
Suggestions are individual ideas or proposals submitted to suggestion boxes on your site. They can be responded to, categorized, and managed by administrators. **Responding to S...
NationBuilder Survey Question Possible Responses API
The potential answers to a survey question.
NationBuilder Survey Question Responses API
User responses to Survey Questions.
NationBuilder Survey Questions API
Questions asked within a survey.
NationBuilder Surveys API
Surveys have questions with possible responses. These questions also have responses from the users.
NationBuilder Voters API
Voter records store the ballot history of a single signup.
Scroll within the panel for all 41 ·
MCP Servers 1
Model Context Protocol servers expose these APIs directly to AI agents. We profile them because agent-native access is the fastest-growing way this provider's capabilities actually get used.
Model Context Protocol servers that expose these APIs to AI agents.
nationbuilder-mcp.yml
MCP SERVERRate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Nationbuilder Rate Limits
RATE LIMITSSecurity Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for NationBuilder — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 3
Portal, sign-up, and the first successful call
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 4
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 5
Pagination, idempotency, versioning, errors, and events
Build 2
SDKs, sample code, and the tooling you integrate with
Access & Security 2
Authentication, authorization, and security posture
Operate 6
Status, limits, changes, and where to get help
Commercial 3
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 1
Properties that don't map to a standard resource type
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