Lob.com
Lob is the direct-mail and address-verification API for developers. Its REST API lets teams programmatically create and mail postcards, letters, checks, self-mailers, snap packs, booklets, buckslips and cards; verify and autocomplete US and international addresses; run direct-mail and USPS Informed Delivery campaigns; manage HTML templates; and track physical delivery through USPS scan events surfaced over webhooks. The API is organized around REST with resource-oriented URLs, HTTP Basic authentication using test_/live_ API keys, cursor pagination, Idempotency-Key support, and standard rate-limit headers. Lob was surfaced as an a16z portfolio company and enriched into the API Evangelist network from its public OpenAPI, docs, SDKs, and registries.
Solid contracts, transparent operations, and an easy start — typically complete on four or five facets with one clear soft spot.
API Evangelist profiles Lob.com the way a machine reads it — 72 machine-readable artifacts across 1 API, 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.com scores 65.6/100 (strong), with a separate agent-readiness read of 44/100 (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. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-08 · rubric v0.20.0
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How we profile Lob.com
Each block below is one kind of artifact we hold for Lob.com. 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 32
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.com Accounts API
The Accounts API from Lob.com — 1 operation(s) for accounts.
Lob.com 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.com Bank Accounts API
Bank Accounts allow you to store your bank account securely in our system. The API provides endpoints for creating bank accounts, deleting bank accounts, verifying bank accounts...
Lob.com Billing Groups API
The Billing Groups API allows you to create and view labels that can be attached to certain consumption-based usages of Letters, Checks, Postcards and Self-Mailers to customize ...
Lob.com Booklets API
The Booklets API from Lob.com — 2 operation(s) for booklets.
Lob.com Buckslip Orders API
The Buckslip Orders endpoint allows you to easily create buckslip orders for existing buckslips. The API provides endpoints for creating buckslip orders and listing buckslip ord...
Lob.com 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.com 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.com Card Orders API
The card orders endpoint allows you to easily create card orders for existing cards. The API provides endpoints for creating card orders and listing card orders for a given card...
Lob.com 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.com 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.com 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.com Identity Validation API
Validates whether a given name is associated with an address.
Lob.com Informed Delivery Campaign API
The Informed Delivery campaigns API allows you to create and view Informed Delivery campaigns.
Lob.com Intl Verifications API
Address verification for non-US addresses
Lob.com 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.com Lob Credits API
The Lob Credits API from Lob.com — 1 operation(s) for lob credits.
Lob.com 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.com QR Codes API
Lob QR codes allow you to generate a QR code that is unique to each mailpiece, thereby allowing each and every customers to receive a personalized link. See the Create endpoint ...
Lob.com Resource Proofs API
The resource proofs endpoint allows you to create a final rendering of any template. This is best practice to ensure that you are visually validating your creative before any ma...
Lob.com Reverse Geocode Lookups API
Find a list of zip codes associated with a valid US location via latitude and longitude.
Lob.com Self Mailers API
The self mailer endpoint allows you to easily print and mail self mailers. The API provides endpoints for creating self mailers, retrieving individual self mailers, canceling se...
Lob.com Snap Packs API
The Snap Packs API from Lob.com — 2 operation(s) for snap packs.
Lob.com Template Versions API
These API endpoints allow you to create, retrieve, update and delete versions of reusable HTML templates for use with the Print & Mail API.
Lob.com Templates API
These API endpoints allow you to create, retrieve, update and delete reusable HTML templates for use with the Print & Mail API.
Lob.com 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.com URL Shortener API
Lob's URL shortener allows you to generate unique short links, either with Lob's own domain or your own custom domains. Each custom link enables Lob to track mail individually a...
Lob.com US Autocompletions API
Given partial address information, this endpoint returns up to 10 address suggestions.
Lob.com US Verifications API
Validate, automatically correct, and standardize the addresses in your address book based on USPS's Codi...
Lob.com Zip Lookups API
Find a list of cities, states and associated information about a US ZIP code.
Lob.com Events API
When various notable things happen within the Lob architecture, Events will be created. To get these events sent to your server automatically when they occur, you can set up [We...
Lob.com Tracking Events API
As mailpieces travel through the mail stream, USPS scans their unique barcodes, and Lob processes these mail scans to generate tracking events.
Certified Tracking Event Deta...
Scroll within the panel for all 32 ·
Open Collections 33
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTIONLob Accounts API
OPEN COLLECTIONLob Addresses API
OPEN COLLECTIONLob Bank Accounts API
OPEN COLLECTIONLob Billing Groups API
OPEN COLLECTIONLob Booklets API
OPEN COLLECTIONLob Buckslip Orders API
OPEN COLLECTIONLob Buckslips API
OPEN COLLECTIONLob Campaigns API
OPEN COLLECTIONLob Card Orders API
OPEN COLLECTIONLob Cards API
OPEN COLLECTIONLob Checks API
OPEN COLLECTIONLob Creatives API
OPEN COLLECTIONLob Events API
OPEN COLLECTIONLob Identity Validation API
OPEN COLLECTIONLob Informed Delivery Campaign API
OPEN COLLECTIONLob Intl Verifications API
OPEN COLLECTIONLob Letters API
OPEN COLLECTIONLob Lob Credits API
OPEN COLLECTIONLob Postcards API
OPEN COLLECTIONLob QR Codes API
OPEN COLLECTIONLob Resource Proofs API
OPEN COLLECTIONLob Reverse Geocode Lookups API
OPEN COLLECTIONLob Self Mailers API
OPEN COLLECTIONLob Snap Packs API
OPEN COLLECTIONLob Template Versions API
OPEN COLLECTIONLob Templates API
OPEN COLLECTIONLob Tracking Events API
OPEN COLLECTIONLob Uploads API
OPEN COLLECTIONLob URL Shortener API
OPEN COLLECTIONLob US Autocompletions API
OPEN COLLECTIONLob US Verifications API
OPEN COLLECTIONLob Zip Lookups API
OPEN COLLECTIONScroll within the panel for all 33 ·
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 things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.
Published pricing tiers and plan structures.
Lobcom 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.
Lobcom Rate Limits
RATE LIMITSEvent Specifications 1
Not every API is request/response. AsyncAPI describes the event-driven and streaming side — the webhooks and channels — so the asynchronous half of the interface is documented the same way the synchronous half is.
AsyncAPI definitions for this provider's event-driven and streaming APIs.
Lobcom Webhooks
ASYNCAPISecurity Posture 3
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 Lob.com — 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 5
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 4
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 9
Pagination, idempotency, versioning, errors, and events
Scroll within the panel for all 9 ·
Build 6
SDKs, sample code, and the tooling you integrate with
Access & Security 4
Authentication, authorization, and security posture
Operate 6
Status, limits, changes, and where to get help
Commercial 5
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 2
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/lobcom · machine-readable index on apis.io
This is an independent, third-party profile of Lob.com, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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