Salsa

Salsa is embedded payroll infrastructure that lets SaaS platforms add native, multi-country (US and Canada) payroll to their products through REST and GraphQL APIs, embeddable UI components (Salsa Express), and real-time webhooks. Partner platforms provision employers and workers, run payroll, disburse worker payments, and handle tax setup and filings without leaving their own app. API access is partner-gated - Salsa issues sandbox and production Bearer API keys to approved platform partners.

Salsa publishes 8 APIs on the APIs.io network, including Companies API, Onboarding & Sessions API, Pay Schedules API, and 5 more. Tagged areas include Payroll, Embedded Finance, Payroll as a Service, Fintech, and Payments.

Salsa’s developer surface includes authentication, documentation, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub

33.8/100 thin ▬ flat Agent 20/100 agent aware saas Full breakdown ↓
scored 2026-09-14 · rubric v0.22.0

AccessFreemiumSelf serve⚡ Free to try

1 APIs

Payroll Embedded FinancePayroll as a ServiceFintech Payments HR TaxMulti-Country

Kin Score

Kin Score How this is scored →
scored 2026-09-14 · rubric v0.22.0

Composite quality — 33.8/100 · thin

Contract Quality 9.8 / 19

Developer Ergonomics 3.2 / 15

Access Clarity 5.9 / 15

Operational Transparency 3.3 / 10

Contract Governance 0.0 / 9

Discoverability 5.1 / 8

Regulatory Posture 2.8 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 20/100 · 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 0 / 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

Regulatory Posture applies to this provider. Its tags matched the Payments 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/.

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 github.com/api-evangelist/salsa: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 8

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

Salsa Companies API

Employer (company) entities and configuration.

Salsa Onboarding & Sessions API

User tokens, hosted onboarding, and mock onboarding.

Salsa Pay Schedules API

Worker pay groups and work weeks.

Salsa Payments API

Individual worker payments and disbursements.

Salsa Payrolls API

Payroll runs and reports.

Salsa Tax API

Employer and worker tax setup.

Salsa Webhooks API

Webhook endpoint management.

Salsa Workers API

Employees and contractors.

Scroll for all 8

Open Collections 10

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

API Collection

OPEN COLLECTION

Salsa Payroll Companies API

OPEN COLLECTION

Salsa Payroll Companies Onboarding & Sessions API

OPEN COLLECTION

Salsa Payroll Companies Pay Schedules API

OPEN COLLECTION

Salsa Payroll Companies Payments API

OPEN COLLECTION

Salsa Payroll Companies Payrolls API

OPEN COLLECTION

Salsa Payroll Companies Tax API

OPEN COLLECTION

Salsa Payroll Companies Webhooks API

OPEN COLLECTION

Salsa Payroll Companies Workers API

OPEN COLLECTION

Salsa Payroll API

OPEN COLLECTION

Scroll for all 10

Pricing Plans 1

Published pricing tiers and plan structures.

Salsa Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Salsa Rate Limits

3 limits

RATE LIMITS

FinOps 1

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

Salsa Finops

FINOPS

Security Posture 2

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

Salsa Authentication

http · 1 scheme

SECURITY

Salsa Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access 1

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

Salsa Agentic Access

42 operations · 25 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 2

The organization behind the API

LinkedIn

Website

Website

Source (apis.yml)

aid: salsa
url: https://raw.githubusercontent.com/api-evangelist/salsa/refs/heads/main/apis.yml
name: Salsa
kind: company
description: Salsa is embedded payroll infrastructure that lets SaaS platforms add native, multi-country (US and Canada) payroll
  to their products through REST and GraphQL APIs, embeddable UI components (Salsa Express), and real-time webhooks. Partner
  platforms provision employers and workers, run payroll, disburse worker payments, and handle tax setup and filings without
  leaving their own app. API access is partner-gated - Salsa issues sandbox and production Bearer API keys to approved platform
  partners.
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: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/salsa.png
tags:
- Payroll
- Embedded Finance
- Payroll as a Service
- Fintech
- Payments
- HR
- Tax
- Multi-Country
created: '2026-07-01'
modified: '2026-07-01'
specificationVersion: '0.23'
apis:
- aid: salsa:salsa-companies-api
  name: Salsa Companies API
  description: Employer (company) entities and configuration.
  humanURL: https://docs.salsa.dev/reference
  baseURL: https://api.salsa.dev/api/rest/v1
  tags:
  - Companies
  properties:
  - type: OpenAPI
    url: openapi/salsa-companies-api-openapi.yml
  - type: Documentation
    url: https://docs.salsa.dev/docs/building-with-salsa
  - type: APIReference
    url: https://docs.salsa.dev/reference
  - type: PostmanCollection
    url: collections/salsa.postman_collection.json
  - type: OpenCollection
    url: collections/salsa.opencollection.json
  - type: Documentation
    url: https://docs.salsa.dev/docs/payroll-run-via-api
  - type: Documentation
    url: https://docs.salsa.dev/docs/express-embedded-ui
- aid: salsa:salsa-onboarding-sessions-api
  name: Salsa Onboarding & Sessions API
  description: User tokens, hosted onboarding, and mock onboarding.
  humanURL: https://docs.salsa.dev/reference
  baseURL: https://api.salsa.dev/api/rest/v1
  tags:
  - Onboarding & Sessions
  properties:
  - type: OpenAPI
    url: openapi/salsa-onboarding-sessions-api-openapi.yml
  - type: Documentation
    url: https://docs.salsa.dev/docs/building-with-salsa
  - type: APIReference
    url: https://docs.salsa.dev/reference
  - type: PostmanCollection
    url: collections/salsa.postman_collection.json
  - type: OpenCollection
    url: collections/salsa.opencollection.json
  - type: Documentation
    url: https://docs.salsa.dev/docs/payroll-run-via-api
  - type: Documentation
    url: https://docs.salsa.dev/docs/express-embedded-ui
- aid: salsa:salsa-pay-schedules-api
  name: Salsa Pay Schedules API
  description: Worker pay groups and work weeks.
  humanURL: https://docs.salsa.dev/reference
  baseURL: https://api.salsa.dev/api/rest/v1
  tags:
  - Pay Schedules
  properties:
  - type: OpenAPI
    url: openapi/salsa-pay-schedules-api-openapi.yml
  - type: Documentation
    url: https://docs.salsa.dev/docs/building-with-salsa
  - type: APIReference
    url: https://docs.salsa.dev/reference
  - type: PostmanCollection
    url: collections/salsa.postman_collection.json
  - type: OpenCollection
    url: collections/salsa.opencollection.json
  - type: Documentation
    url: https://docs.salsa.dev/docs/payroll-run-via-api
  - type: Documentation
    url: https://docs.salsa.dev/docs/express-embedded-ui
- aid: salsa:salsa-payments-api
  name: Salsa Payments API
  description: Individual worker payments and disbursements.
  humanURL: https://docs.salsa.dev/reference
  baseURL: https://api.salsa.dev/api/rest/v1
  tags:
  - Payments
  properties:
  - type: OpenAPI
    url: openapi/salsa-payments-api-openapi.yml
  - type: Documentation
    url: https://docs.salsa.dev/docs/building-with-salsa
  - type: APIReference
    url: https://docs.salsa.dev/reference
  - type: PostmanCollection
    url: collections/salsa.postman_collection.json
  - type: OpenCollection
    url: collections/salsa.opencollection.json
  - type: Documentation
    url: https://docs.salsa.dev/docs/payroll-run-via-api
  - type: Documentation
    url: https://docs.salsa.dev/docs/express-embedded-ui
- aid: salsa:salsa-payrolls-api
  name: Salsa Payrolls API
  description: Payroll runs and reports.
  humanURL: https://docs.salsa.dev/reference
  baseURL: https://api.salsa.dev/api/rest/v1
  tags:
  - Payrolls
  properties:
  - type: OpenAPI
    url: openapi/salsa-payrolls-api-openapi.yml
  - type: Documentation
    url: https://docs.salsa.dev/docs/building-with-salsa
  - type: APIReference
    url: https://docs.salsa.dev/reference
  - type: PostmanCollection
    url: collections/salsa.postman_collection.json
  - type: OpenCollection
    url: collections/salsa.opencollection.json
  - type: Documentation
    url: https://docs.salsa.dev/docs/payroll-run-via-api
  - type: Documentation
    url: https://docs.salsa.dev/docs/express-embedded-ui
- aid: salsa:salsa-tax-api
  name: Salsa Tax API
  description: Employer and worker tax setup.
  humanURL: https://docs.salsa.dev/reference
  baseURL: https://api.salsa.dev/api/rest/v1
  tags:
  - Tax
  properties:
  - type: OpenAPI
    url: openapi/salsa-tax-api-openapi.yml
  - type: Documentation
    url: https://docs.salsa.dev/docs/building-with-salsa
  - type: APIReference
    url: https://docs.salsa.dev/reference
  - type: PostmanCollection
    url: collections/salsa.postman_collection.json
  - type: OpenCollection
    url: collections/salsa.opencollection.json
  - type: Documentation
    url: https://docs.salsa.dev/docs/payroll-run-via-api
  - type: Documentation
    url: https://docs.salsa.dev/docs/express-embedded-ui
- aid: salsa:salsa-webhooks-api
  name: Salsa Webhooks API
  description: Webhook endpoint management.
  humanURL: https://docs.salsa.dev/reference
  baseURL: https://api.salsa.dev/api/rest/v1
  tags:
  - Webhook
  tags_raw:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/salsa-webhooks-api-openapi.yml
  - type: Documentation
    url: https://docs.salsa.dev/docs/building-with-salsa
  - type: APIReference
    url: https://docs.salsa.dev/reference
  - type: PostmanCollection
    url: collections/salsa.postman_collection.json
  - type: OpenCollection
    url: collections/salsa.opencollection.json
  - type: Documentation
    url: https://docs.salsa.dev/docs/payroll-run-via-api
  - type: Documentation
    url: https://docs.salsa.dev/docs/express-embedded-ui
- aid: salsa:salsa-workers-api
  name: Salsa Workers API
  description: Employees and contractors.
  humanURL: https://docs.salsa.dev/reference
  baseURL: https://api.salsa.dev/api/rest/v1
  tags:
  - Workers
  properties:
  - type: OpenAPI
    url: openapi/salsa-workers-api-openapi.yml
  - type: Documentation
    url: https://docs.salsa.dev/docs/building-with-salsa
  - type: APIReference
    url: https://docs.salsa.dev/reference
  - type: PostmanCollection
    url: collections/salsa.postman_collection.json
  - type: OpenCollection
    url: collections/salsa.opencollection.json
  - type: Documentation
    url: https://docs.salsa.dev/docs/payroll-run-via-api
  - type: Documentation
    url: https://docs.salsa.dev/docs/express-embedded-ui
common:
- type: AgenticAccess
  url: agentic-access/salsa-agentic-access.yml
- type: DomainSecurity
  url: security/salsa-domain-security.yml
- type: Authentication
  url: authentication/salsa-authentication.yml
- type: GitHubOrganization
  url: https://github.com/salsa-payroll
- type: LinkedIn
  url: https://www.linkedin.com/company/salsa-dev
- type: Website
  url: https://www.salsa.dev/
- type: Documentation
  url: https://docs.salsa.dev/
- type: Plans
  url: plans/salsa-plans-pricing.yml
- type: RateLimits
  url: rate-limits/salsa-rate-limits.yml
- type: FinOps
  url: finops/salsa-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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