Head to head · Payroll run · October 2026 research run
Gusto vs Salsa
Gusto scores 63.3 (B) on agent readiness against Salsa's 46.1 (D), and leads in every scored category. Both do payroll run.
Which one, for what
Gusto B
Good for A software platform that wants to run US payroll for its own customers and can pass Gusto's partner reviews.
Ahead on
- Reliability, 58 against 36
- Schema & documentation, 86 against 73
- Agent ergonomics, 82 against 48
- Payments & pricing, 15 against 5
- Maintenance & community, 76 against 50
- Transparency & trust, 61 against 51
Watch for
Production keys need commercial, security and implementation reviews with Gusto's partnerships team, and the docs say not all use cases are supported
Salsa D
Good for A software platform that wants to sell payroll to its own business customers and can sign a partner agreement, with Salsa handling tax filing and money movement.
Also in its favour
- A hosted endpoint, with nothing to install
Watch for
API tokens come from Salsa after a sales contact. No self-serve signup, public price, free tier or trial was found
Score by category
| Category | Weight this run | Gusto | Salsa | Edge |
|---|---|---|---|---|
| Reliability | 16%20 | 58 | 36 | Gusto +22 |
| Performance | 10%pending | pending | pending | not scored in this run |
| Schema & documentation | 13%16.2 | 86 | 73 | Gusto +13 |
| Agent ergonomics | 13%16.2 | 82 | 48 | Gusto +34 |
| Security & auth | 14%17.5 | 60 | 56 | Gusto +4 |
| Payments & pricing | 10%12.5 | 15 | 5 | Gusto +10 |
| Task success | 10%pending | pending | pending | not scored in this run |
| Maintenance & community | 7%8.8 | 76 | 50 | Gusto +26 |
| Transparency & trust | 7%8.8 | 61 | 51 | Gusto +10 |
| Negative events | ≤15 | 0 | 0 | |
| Total | 63.3 · B | 46.1 · D |
Facts side by side
| Fact | Gusto | Salsa |
|---|---|---|
| Kind | HTTP API | HTTP API |
| Vendor | Gusto, Inc. | Salsa Software Inc. |
| Hosted endpoint | no (local only) | https://api.salsa.dev/api/rest/v1 |
| Transports | HTTP | HTTP |
| Auth | OAuth | API key |
| Pricing | Paid | Paid |
| x402 | no | no |
| Licence | Proprietary service under Gusto's API Policy and Developer Terms of Service. The API clients on GitHub are MIT, and the React SDK and the Gusto CLI are Apache-2.0 | Proprietary service. The website Terms of Use are public and the partner agreement isn't. The browser library @salsa-payroll/salsa-js on npm is MIT |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-01 | 2026-10-07 |
| Terms last updated | couldn't be read | 2022-04-07 |
| Privacy policy last updated | no document linked | 2025-09-24 |
| Customer content may train models | couldn't be read | not found in the text |
| Terms restrict automated access | couldn't be read | yes |
| Terms restrict benchmarking | couldn't be read | not found in the text |
| Terms or service can change without notice | couldn't be read | yes |
| Arbitration or class-action waiver | couldn't be read | yes |
| Popularity | 2 stars, 25k npm/wk | 435 npm/wk |
Verdicts
Gusto
This listing covers the Embedded Payroll API. Every reference page carries an OpenAPI 3.1 definition, payroll is calculated as a preview before submission, and each API version gets 12 months of deprecation support. Production needs commercial and security approval, no price was readable, and the status page lists 11 incidents between 14 July and 5 October 2026, five marked major.
Salsa
Salsa is reached as an embedded-payroll partner, not through an employer's existing payroll account. The REST API has a public OpenAPI 3.1 spec with 123 operations, a payroll preview, a separate confirm step and short-lived user tokens limited by role. Access starts with a sales conversation, and no public price, self-serve sandbox, status page or API changelog was found.
Before you call either
Gusto
- Develop against https://api.gusto-demo.com. Production at https://api.gusto.com needs keys Gusto issues after its reviews
- Send
X-Gusto-API-Version: 2026-06-15on every call. Without it the application's minimum version applies - Send the resource's current
versionwith every PUT, and only the fields to change. A stale version returns 409 - Calculate and submit return 202. Poll GET on the payroll until
calculated_atis set or the status is processed, and readsubmission_blockersfirst - For a company already on Gusto, the Embedded API is the wrong route. Use the Gusto CLI or the MCP server at https://mcp.api.gusto.com, which draft payroll but can't submit it
Salsa
- Use the sandbox token against https://api.sandbox.salsa.dev and the production token against https://api.salsa.dev. Each environment has its own token
- Call POST /payroll-runs/preview before creating a run, then confirm the PENDING run in a separate call. Confirming starts the employer debit
- Send your own externalId on every create. A repeat returns a uniqueness error, which is the only duplicate protection
- Make sure externalId values are unique across all employers, since each entity type has one namespace
- Mint a user token with the lowest role and the fewest employerIds the task needs, and keep the partner token on the server
Questions
Which is better for AI agents, Gusto or Salsa?
Gusto scores 63.3 (B) on agent readiness against Salsa's 46.1 (D), and leads in every scored category.
Do Gusto and Salsa need an API key?
Gusto uses an OAuth sign-in. Salsa needs an API key.
Can an agent call Gusto and Salsa without installing anything?
No hosted endpoint is listed for Gusto. Salsa has a hosted endpoint at https://api.salsa.dev/api/rest/v1.
Other comparisons with Gusto or Salsa
Machine-readable
- This page as Markdown
/compare/gusto-vs-salsa.md· slim.min.md· JSON.json(or sendAccept: text/markdown) - Each listing in full
/api/v1/tools/gusto.json·/api/v1/tools/salsa.json - From a terminal
anchor compare gusto salsa(the CLI) - Over MCP
compare_tools {"a": "gusto", "b": "salsa"}at/mcp, no key