Lob
Lob is a software platform that automates the process of sending direct mail, allowing businesses to create, personalize, and track physical mail pieces at scale through a digital interface, essentially bringing the convenience of email marketing to traditional mail by integrating with existing CRM systems and automating printing, addressing, and postage processes.
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 Lob the way a machine reads it — 51 machine-readable artifacts across 46 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 — Lob scores 52.5/100 (developing), with a separate agent-readiness read of 47/100 (agent ready). 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 Lob
Each block below is one kind of artifact we hold for Lob. 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 46
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.
Lob Accounts API
The Accounts API from Lob — 1 operation(s) for accounts.
Lob Addresses API
To add an address to your address book, you create a new address object. You can retrieve and delete individual addresses as well as get a list of addresses. Addresses are ident...
Lob Bank Accounts API
The Bank Accounts API from Lob — 1 operation(s) for bank accounts.
Lob Bank_id API
The Bank_id API from Lob — 2 operation(s) for bank_id.
Lob Bg_id API
The Bg_id API from Lob — 1 operation(s) for bg_id.
Lob Billing Groups API
The Billing Groups API from Lob — 1 operation(s) for billing groups.
Lob Booklet_id API
The Booklet_id API from Lob — 1 operation(s) for booklet_id.
Lob Booklets API
The Booklets API from Lob — 1 operation(s) for booklets.
Lob Buckslip_id API
The Buckslip_id API from Lob — 2 operation(s) for buckslip_id.
Lob Buckslips API
The Buckslips endpoint allows you to easily create buckslips that can later be used as add-ons for Letters Campaigns. Note that a Letter Campaign with Buckslip add-on requires a...
Lob Bulk API
The Bulk API from Lob — 2 operation(s) for bulk.
Lob Campaigns API
The campaigns endpoint allows you to create and view campaigns that can be used to send multiple letters or postcards. The API provides endpoints for creating campaigns, updatin...
Lob Cards API
The cards endpoint allows you to easily create cards that can later be affixed to Letters. The API provides endpoints for creating cards, retrieving individual cards, creating c...
Lob Checks API
Checks allow you to send payments via physical checks. The API provides endpoints for creating checks, retrieving individual checks, canceling checks, and retrieving a list of c...
Lob Creatives API
The creatives endpoint allows you to create and view creatives. Creatives are used to create reusable letter and postcard templates. The API provides endpoints for creating crea...
Lob Crv_id API
The Crv_id API from Lob — 1 operation(s) for crv_id.
Lob Domains API
The Domains API from Lob — 2 operation(s) for domains.
Lob Exports API
The Exports API from Lob — 2 operation(s) for exports.
Lob Files API
The Files API from Lob — 1 operation(s) for files.
Lob Identity Validation API
The Identity Validation API from Lob — 1 operation(s) for identity validation.
Lob Informed Delivery Campaign API
The Informed Delivery Campaign API from Lob — 1 operation(s) for informed delivery campaign.
Lob Intl Verifications API
The Intl Verifications API from Lob — 2 operation(s) for intl verifications.
Lob Letters API
The letters endpoint allows you to easily print and mail letters. The API provides endpoints for creating letters, retrieving individual letters, canceling letters, and retrievi...
Lob Links API
The Links API from Lob — 2 operation(s) for links.
Lob Ltr_id API
The Ltr_id API from Lob — 1 operation(s) for ltr_id.
Lob Orders API
The Orders API from Lob — 2 operation(s) for orders.
Lob Postcards API
The postcards endpoint allows you to easily print and mail postcards. The API provides endpoints for creating postcards, retrieving individual postcards, canceling postcards, an...
Lob Psc_id API
The Psc_id API from Lob — 1 operation(s) for psc_id.
Lob Q R Codes API
The Q R Codes API from Lob — 1 operation(s) for q r codes.
Lob Reports API
The Reports API from Lob — 1 operation(s) for reports.
Lob Reverse Geocode Lookups API
The Reverse Geocode Lookups API from Lob — 1 operation(s) for reverse geocode lookups.
Lob Self Mailers API
The Self Mailers API from Lob — 1 operation(s) for self mailers.
Lob Send API
The Send API from Lob — 1 operation(s) for send.
Lob Sfm_id API
The Sfm_id API from Lob — 1 operation(s) for sfm_id.
Lob Snap_pack_id API
The Snap_pack_id API from Lob — 1 operation(s) for snap_pack_id.
Lob Snap Packs API
The Snap Packs API from Lob — 1 operation(s) for snap packs.
Lob Template Versions API
The Template Versions API from Lob — 1 operation(s) for template versions.
Lob Templates API
These API endpoints allow you to create, retrieve, update and delete reusable HTML templates for use with the Print & Mail API.
Lob U S Autocompletions API
The U S Autocompletions API from Lob — 1 operation(s) for u s autocompletions.
Lob U S Verifications API
The U S Verifications API from Lob — 2 operation(s) for u s verifications.
Lob Uploads API
The uploads endpoint allows you to upload audience files that are then associated with a given campaign. At this time, only CSV files are allowed. The API provides endpoints for...
Lob Usps_campaign_id API
The Usps_campaign_id API from Lob — 1 operation(s) for usps_campaign_id.
Lob Verify API
The Verify API from Lob — 1 operation(s) for verify.
Lob Versions API
The Versions API from Lob — 2 operation(s) for versions.
Lob Zip Lookups API
The Zip Lookups API from Lob — 1 operation(s) for zip lookups.
Scroll within the panel for all 46 ·
Pricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the six things the Kin Score reads for commercial clarity.
Published pricing tiers and plan structures.
Lob Plans Pricing
PLANSRate 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.
Lob Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Lob Finops
FINOPSSecurity 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.
Resources
Every other property we hold for Lob — 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 1
Portal, sign-up, and the first successful call
Design & Contract 2
Pagination, idempotency, versioning, errors, and events
Build 2
SDKs, sample code, and the tooling you integrate with
Access & Security 3
Authentication, authorization, and security posture
Operate 3
Status, limits, changes, and where to get help
Commercial 3
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
Other 2
Properties that don't map to a standard resource type
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