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Slash

Slash is a business banking and finance platform for modern companies — startups, agencies, e-commerce sellers, and enterprises — combining business checking, unlimited virtual and physical corporate cards, ACH/wire and real-time payments, global USD accounts, stablecoin on/off ramps, treasury, invoicing, expense management, and reporting on one platform. Founded in 2021 and valued at $1.4B after a 2026 Series C led by Ribbit Capital, Slash exposes a REST API (currently in Beta) covering accounts, virtual accounts, cards and card groups, transactions, transfers, invoices, contacts and customers, expense reports, webhooks, and FDX-compliant financial data access — plus an official hosted MCP server, Agent Requests with human-in-the-loop approval, and Python and Node.js SDKs for AI-agent and programmatic integration.

agent native

Reference-quality API operations across every facet — a rich contract, published governance, transparent operations, and machine-readable commercial terms.

Kin Score

API Evangelist profiles Slash the way a machine reads it — 142 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 — Slash scores 69.5/100 (exemplar), with a separate agent-readiness read of 48/100 (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 Kin Score How this is scored →
scored 2026-10-17 · rubric v0.24.0
Slash Kin Score — API readiness rating by API Evangelist

Put this on your own site. The badge is drawn live from Slash's current Kin Score — paste it once and it updates itself every time the score is recomputed. It follows your visitor's light or dark setting, and it links back here so anyone who sees it can read the full breakdown.

<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/slash/"
   title="Slash on API Evangelist — API profile and Kin Score">
  <img src="https://apis.io/badge/slash.svg"
       alt="Slash Kin Score — API readiness rating by API Evangelist" width="150" height="150" loading="lazy">
</a>

More shapes, themes and sizes → · Score as JSON · How badges work

How we profile Slash

Each block below is one kind of artifact we hold for Slash. 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 26

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.

Slash Account API

The Account API from Slash — 4 operation(s) for account.

Slash Agent Requests API

The Agent Requests API from Slash — 2 operation(s) for agent requests.

Slash Analytics API

The Analytics API from Slash — 1 operation(s) for analytics.

Slash Card API

The Card API from Slash — 5 operation(s) for card.

Slash Card Group API

The Card Group API from Slash — 4 operation(s) for card group.

Slash Card Product API

The Card Product API from Slash — 1 operation(s) for card product.

Slash Contact API

The Contact API from Slash — 3 operation(s) for contact.

Slash Crypto API

The Crypto API from Slash — 1 operation(s) for crypto.

Slash Customer API

The Customer API from Slash — 3 operation(s) for customer.

Slash Developer Account API

The Developer Account API from Slash — 1 operation(s) for developer account.

Slash Developer Application API

The Developer Application API from Slash — 2 operation(s) for developer application.

Slash Expense Report API

The Expense Report API from Slash — 7 operation(s) for expense report.

Slash Fdx API

The Fdx API from Slash — 8 operation(s) for fdx.

Slash Invoice API

The Invoice API from Slash — 13 operation(s) for invoice.

Slash Legal Entity API

The Legal Entity API from Slash — 1 operation(s) for legal entity.

Slash Merchant API

The Merchant API from Slash — 2 operation(s) for merchant.

Slash Merchant Category API

The Merchant Category API from Slash — 1 operation(s) for merchant category.

Slash Task API

The Task API from Slash — 4 operation(s) for task.

Slash Tokens API

The Tokens API from Slash — 1 operation(s) for tokens.

Slash Transaction API

The Transaction API from Slash — 5 operation(s) for transaction.

Slash Transfer API

The Transfer API from Slash — 1 operation(s) for transfer.

Slash Transfers API

The Transfers API from Slash — 1 operation(s) for transfers.

Slash Virtual Account API

The Virtual Account API from Slash — 2 operation(s) for virtual account.

Slash Webhook API

The Webhook API from Slash — 2 operation(s) for webhook.

Slash .well Known API

The .well Known API from Slash — 1 operation(s) for .well known.

Slash Oauth2 API

The Oauth2 API from Slash — 2 operation(s) for oauth2.

Scroll within the panel for all 26 ·

Postman Collections 26

A runnable collection turns the contract into something a developer can execute in seconds. We profile them because the fastest way to trust an API is to make a real call against it.

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

Scroll within the panel for all 26 ·

Open Collections 27

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).

Scroll within the panel for all 27 ·

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.

Slash MCP Server

Remote MCP server at mcp.slash.com over HTTP requiring an API key; 3 tools listed.

MCP SERVER

Pricing Plans 2

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.

Slash Plans Pricing

2 plans

PLANS

Slash Price Estimates

0 plans

PLANS

Rate 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.

Slash Rate Limits

0 limits

RATE LIMITS

Event 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.

Slash Webhooks

ASYNCAPI

Semantic Vocabularies 1

JSON-LD contexts give the data shared meaning across APIs. We profile them because semantics are what let a machine reconcile 'customer' here with 'customer' somewhere else.

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

Slash Context

119 classes · 307 properties

JSON-LD

Spectral Rules 1

Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.

Slash API Rules

18 rules · 13 errors · 4 warnings

SPECTRAL

JSON Schema 51

Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.

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

Account

8 properties

JSON SCHEMA

AgentRequest

5 properties

JSON SCHEMA

AuthorizationWebhookConfig

0 properties

JSON SCHEMA

AuthorizationWebhook

7 properties

JSON SCHEMA

Balance

5 properties

JSON SCHEMA

CardGroup

4 properties

JSON SCHEMA

CardGroupUtilization

3 properties

JSON SCHEMA

CardModifier

0 properties

JSON SCHEMA

CardProduct

3 properties

JSON SCHEMA

Card

19 properties

JSON SCHEMA

Contact

8 properties

JSON SCHEMA

Address

9 properties

JSON SCHEMA

Wallet

6 properties

JSON SCHEMA

Customer

7 properties

JSON SCHEMA

DeveloperApplicationData

9 properties

JSON SCHEMA

DeveloperApplicationModel

9 properties

JSON SCHEMA

DeveloperApplicationType

0 properties

JSON SCHEMA

DeveloperApplicationScope

0 properties

JSON SCHEMA

FeeTransaction

7 properties

JSON SCHEMA

LegalEntity

3 properties

JSON SCHEMA

MerchantCategory

2 properties

JSON SCHEMA

Merchant

3 properties

JSON SCHEMA

PaginationResponse

2 properties

JSON SCHEMA

PartialSpendingConstraint

5 properties

JSON SCHEMA

PostRequest

1 properties

JSON SCHEMA

PostResponse

4 properties

JSON SCHEMA

Account

0 properties

JSON SCHEMA

AccountWithBalance

0 properties

JSON SCHEMA

DepositTransaction

14 properties

JSON SCHEMA

InvestmentTransaction

23 properties

JSON SCHEMA

LineOfCreditTransaction

14 properties

JSON SCHEMA

LoanTransaction

13 properties

JSON SCHEMA

UserInfoResponse

4 properties

JSON SCHEMA

paths.task._dto.TaskResponse

0 properties

JSON SCHEMA

ParsedReceipt

3 properties

JSON SCHEMA

PublicExpenseReportWithMetadata

0 properties

JSON SCHEMA

ReimbursementSource

0 properties

JSON SCHEMA

IAddressModel

6 properties

JSON SCHEMA

InvoiceAggregate

3 properties

JSON SCHEMA

InvoiceDetailsInput

8 properties

JSON SCHEMA

InvoiceSeriesInput

10 properties

JSON SCHEMA

InvoiceSeries

14 properties

JSON SCHEMA

InvoiceSettingsData

9 properties

JSON SCHEMA

InvoiceSlashPaymentMethodConfig

0 properties

JSON SCHEMA

SpendingConstraint

5 properties

JSON SCHEMA

Transaction

31 properties

JSON SCHEMA

VirtualAccountCommissionDetails

0 properties

JSON SCHEMA

VirtualAccountCommissionRule

3 properties

JSON SCHEMA

VirtualAccountModel

7 properties

JSON SCHEMA

VirtualAccount

4 properties

JSON SCHEMA

Webhook

10 properties

JSON SCHEMA

Scroll within the panel for all 51 ·

Security 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.

Slash Authentication

apiKey/http · 3 schemes

SECURITY

Slash Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Slash Vulnerability Disclosure

security.txt · contact published

SECURITY

Scopes 1

OAuth scopes are the vocabulary of least-privilege access. Profiling them shows exactly what an integration — or an agent acting on a user's behalf — is allowed to do.

OAuth scopes governing access to this provider's APIs.

Slash Scopes

52 scopes

52 scopes

SCOPES

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.

Slash Agentic Access

105 operations · 47 acting

105 operations · 47 acting

AGENTIC

Resources

Every other property we hold for Slash — 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.

Documentation 2

Reference material describing how the API behaves

Company 3

The organization behind the API

← All providers · Data indexed from github.com/api-evangelist/slash · machine-readable index on apis.io

Where this information came from

This is an independent, third-party profile of Slash, 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.

info@apievangelist.com · Read the full data-sourcing policy →
On a security or compliance team? Put security in the subject line and you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.