Smarty

Smarty (formerly SmartyStreets) is an address intelligence company that provides REST APIs for US and international address verification, validation, geocoding, and autocomplete at high volume. The platform supports over 210 million US addresses including 20 million non-USPS addresses, delivering up to 55 metadata points and ZIP9-level geocodes per lookup. Smarty offers both cloud-hosted and on-premises deployment options, supporting embedded-key and secret-key authentication patterns. APIs are designed for high-throughput workloads, with US address lookups reaching up to 25,000 per second, making Smarty suitable for enterprise address validation pipelines and real-time checkout address autocomplete.

Smarty publishes 5 API contracts indexed on the APIs.io network, including Lookup API, Street Address API, Us Enrichment API, and 2 more. Tagged areas include Address Verification, Geocoding, Address Autocomplete, ZIP Code, and Address Intelligence.

The Smarty catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Smarty’s developer surface includes authentication, documentation, engineering blog, pricing, changelog, and 17 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

37.1/100 thin ▬ flat Agent 19/100 agent aware Front door AI 2/6 trace Heartbeat 67/100 alive saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serveFree trial⚡ Free to try

9 published contracts

Address Verification Geocoding Address Autocomplete ZIP CodeAddress IntelligenceLocation DataInternational AddressUS AddressGeospatial

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Information & Data Management

BC-610

Verifystreet-address

GET /street-address POST /street-address GET /verify

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 37.1/100 · thin

Contract Quality 11.4 / 19

Developer Ergonomics 3.8 / 15

Access Clarity 2.2 / 15

Operational Transparency 3.9 / 10

Contract Governance 2.1 / 9

Discoverability 5.4 / 8

Regulatory Posture 1.6 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 19/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 0 / 5

Distinct Operations 0 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented) Ask about this →

10 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 14.9 — up to +17.0 composite points Ask about this →
Developer Ergonomics scores 25.0 — up to +15.0 composite points Ask about this →
Contract Quality scores 60.9 — up to +9.8 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/smarty/apis.yml: open an issue on github.com/api-evangelist/smarty to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Overture Maps Foundation (members + data contributors)	standard	40.7	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

APIs 5

Individual APIs this provider publishes, each with its own machine-readable definition.

Smarty Lookup API

The Lookup API from Smarty — 3 operation(s) for lookup.

Smarty Street Address API

The street-address API from Smarty — 1 operation(s) for street-address.

Smarty Us Enrichment API

The us-enrichment API from Smarty — 8 operation(s) for us-enrichment.

Smarty US Extract API

The US Extract API API from Smarty — 1 operation(s) for us extract api.

Smarty Verify API

The Verify API from Smarty — 1 operation(s) for verify.

Postman Collections 6

Ready-to-run Postman collections for exercising this provider's APIs.

International Address Autocomplete Lookup API

POSTMAN

International Address Autocomplete Lookup reverse-geo API

POSTMAN

International Address Autocomplete Lookup street-address API

POSTMAN

International Address Autocomplete Lookup us-enrichment API

POSTMAN

International Address Autocomplete Lookup US Extract API API

POSTMAN

International Address Autocomplete Lookup Verify API

POSTMAN

Open Collections 6

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

International Address Autocomplete Lookup API

OPEN COLLECTION

International Address Autocomplete Lookup reverse-geo API

OPEN COLLECTION

International Address Autocomplete Lookup street-address API

OPEN COLLECTION

International Address Autocomplete Lookup us-enrichment API

OPEN COLLECTION

International Address Autocomplete Lookup US Extract API API

OPEN COLLECTION

International Address Autocomplete Lookup Verify API

OPEN COLLECTION

Smarty API pricing

Not yet checked against Smarty's own pricing page. Compiled by API Evangelist on 2026-06-12; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free Trial free	—
Free Trial - International free	—
Professional - US Address paid	—
Professional - International Address paid	—
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

: undisclosed requests
: 25000 address lookups per second
: 3500 address lookups per second

Compiled by API Evangelist, not yet checked against Smarty's documentation. Rate-limit details →

Pricing Plans 1

Published pricing tiers and plan structures.

Smarty Plans Pricing

5 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Smarty Rate Limits

3 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Smarty Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Smarty Context

6 classes · 46 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Smarty — jsonschema rules

5 rules · 4 warn-severity 1 info-severity

SPECTRAL

JSON Schema 2

Standalone JSON Schema definitions for this provider's data models.

Smarty US Address Request

12 properties

JSON SCHEMA

Smarty US Address Response

11 properties

JSON SCHEMA

Examples 2

Example request and response payloads for these APIs.

Smarty Us Autocomplete Response

1 fields

EXAMPLE

Smarty Us Reverse Geocode Response

1 fields

EXAMPLE

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Smarty Authentication

apiKey · 3 schemes

SECURITY

Smarty Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

Recommended x-agentic-access execution contracts for AI agents.

Smarty Agentic Access

16 operations · 2 acting

AGENTIC

Resources

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

JSONSchema

JSONSchema

JSONSchema

JSONSchema

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Vocabulary

Vocabulary

JSONLDContext

JSONLDContext

Build 3

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace

PostmanWorkspace

GitHubOrganization

GitHubOrganization

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 3

Status, limits, changes, and where to get help

StatusPage

StatusPage

ChangeLog

ChangeLog

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

Other 2

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: smarty
name: Smarty
description: Smarty (formerly SmartyStreets) is an address intelligence company that provides REST APIs for US and international
  address verification, validation, geocoding, and autocomplete at high volume. The platform supports over 210 million US
  addresses including 20 million non-USPS addresses, delivering up to 55 metadata points and ZIP9-level geocodes per lookup.
  Smarty offers both cloud-hosted and on-premises deployment options, supporting embedded-key and secret-key authentication
  patterns. APIs are designed for high-throughput workloads, with US address lookups reaching up to 25,000 per second, making
  Smarty suitable for enterprise address validation pipelines and real-time checkout address autocomplete.
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: true
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium (free trial) · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/smarty.png
tags:
- Address Verification
- Geocoding
- Address Autocomplete
- ZIP Code
- Address Intelligence
- Location Data
- International Address
- US Address
- Geospatial
url: https://raw.githubusercontent.com/api-evangelist/smarty/refs/heads/main/apis.yml
created: '2026-06-12'
modified: '2026-09-16'
specificationVersion: '0.23'
apis:
- aid: smarty:smarty-lookup-api
  name: Smarty Lookup API
  description: The Lookup API from Smarty — 3 operation(s) for lookup.
  humanURL: https://www.smarty.com/products/apis/us-street-api
  baseURL: https://us-street.api.smarty.com/street-address
  tags:
  - Lookup
  properties:
  - type: OpenAPI
    url: openapi/smarty-lookup-api-openapi.yml
  - type: Documentation
    url: https://www.smarty.com/docs/apis/us-street-api/reference
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-autocomplete-pro-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-zipcode-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-reverse-geo-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-enrichment-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-extract-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/international-street-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/international-autocomplete-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/international-postal-code-api
- aid: smarty:smarty-street-address-api
  name: Smarty Street Address API
  description: The street-address API from Smarty — 1 operation(s) for street-address.
  humanURL: https://www.smarty.com/products/apis/us-street-api
  baseURL: https://us-street.api.smarty.com/street-address
  tags:
  - street-address
  properties:
  - type: OpenAPI
    url: openapi/smarty-street-address-api-openapi.yml
  - type: Documentation
    url: https://www.smarty.com/docs/apis/us-street-api/reference
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-autocomplete-pro-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-zipcode-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-reverse-geo-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-enrichment-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-extract-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/international-street-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/international-autocomplete-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/international-postal-code-api
- aid: smarty:smarty-us-enrichment-api
  name: Smarty Us Enrichment API
  description: The us-enrichment API from Smarty — 8 operation(s) for us-enrichment.
  humanURL: https://www.smarty.com/products/apis/us-street-api
  baseURL: https://us-street.api.smarty.com/street-address
  tags:
  - us-enrichment
  properties:
  - type: OpenAPI
    url: openapi/smarty-us-enrichment-api-openapi.yml
  - type: Documentation
    url: https://www.smarty.com/docs/apis/us-street-api/reference
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-autocomplete-pro-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-zipcode-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-reverse-geo-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-enrichment-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-extract-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/international-street-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/international-autocomplete-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/international-postal-code-api
- aid: smarty:smarty-us-extract-api-api
  name: Smarty US Extract API
  description: The US Extract API API from Smarty — 1 operation(s) for us extract api.
  humanURL: https://www.smarty.com/products/apis/us-street-api
  baseURL: https://us-street.api.smarty.com/street-address
  tags:
  - US Extract API
  properties:
  - type: OpenAPI
    url: openapi/smarty-us-extract-api-api-openapi.yml
  - type: Documentation
    url: https://www.smarty.com/docs/apis/us-street-api/reference
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-autocomplete-pro-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-zipcode-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-reverse-geo-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-enrichment-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-extract-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/international-street-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/international-autocomplete-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/international-postal-code-api
- aid: smarty:smarty-verify-api
  name: Smarty Verify API
  description: The Verify API from Smarty — 1 operation(s) for verify.
  humanURL: https://www.smarty.com/products/apis/us-street-api
  baseURL: https://us-street.api.smarty.com/street-address
  tags:
  - Verify
  properties:
  - type: OpenAPI
    url: openapi/smarty-verify-api-openapi.yml
  - type: Documentation
    url: https://www.smarty.com/docs/apis/us-street-api/reference
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-autocomplete-pro-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-zipcode-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-reverse-geo-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-enrichment-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/us-extract-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/international-street-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/international-autocomplete-api
  - type: Documentation
    url: https://www.smarty.com/docs/cloud/international-postal-code-api
common:
- type: CapabilityMap
  url: capabilities/smarty-capability-edges.yml
  name: Smarty Business Capability Map
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/smarty/overview
- type: AgenticAccess
  url: agentic-access/smarty-agentic-access.yml
- type: DomainSecurity
  url: security/smarty-domain-security.yml
- type: Authentication
  url: authentication/smarty-authentication.yml
- type: Website
  url: https://www.smarty.com/
- type: Documentation
  url: https://www.smarty.com/docs
- type: GitHubOrganization
  url: https://github.com/smartystreets
- type: GitHubOrganization
  url: https://github.com/smarty
- type: LinkedIn
  url: https://www.linkedin.com/company/smarty-digital-llc
- type: Blog
  url: https://www.smarty.com/blog
- type: Pricing
  url: https://www.smarty.com/pricing
- type: StatusPage
  url: https://status.smarty.com/
- type: ChangeLog
  url: https://www.smarty.com/docs/changelog
- type: X
  url: https://x.com/smartycompany
- type: Plans
  url: plans/smarty-plans-pricing.yml
- type: RateLimits
  url: rate-limits/smarty-rate-limits.yml
- type: FinOps
  url: finops/smarty-finops.yml
- type: Vocabulary
  url: vocabulary/smarty-vocabulary.yml
- type: JSONLDContext
  url: json-ld/smarty-context.jsonld
- type: JSONSchema
  url: json-schema/smarty-us-address-request.json
- type: JSONSchema
  url: json-schema/smarty-us-address-response.json
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Smarty API — frequently asked questions

Does Smarty have an API?

Yes. APIs.io lists 5 APIs from Smarty, including Smarty Lookup API, Smarty Street Address API and Smarty Us Enrichment API, and 2 more.

Is there an OpenAPI specification for the Smarty API?

Yes. APIs.io indexes 5 OpenAPI specifications for Smarty, each linked for download from this page.

How do I authenticate with the Smarty API?

Smarty uses bearer-token authentication (apiKey · 3 schemes). The details are profiled on APIs.io as Smarty Authentication.

How much does the Smarty API cost?

APIs.io lists 5 pricing plans for Smarty, with each plan's price, limits and inclusions under Pricing on this page.

Is the Smarty API ready for AI agents?

Smarty has a Kin Score of 37.1 out of 100 (thin) and an Agent Readiness score of 19.3 (agent-aware), scored by API Evangelist on 2026-11-13.

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