Category · Domain data
Payroll APIs and embedded payroll for AI agents
Payroll run through an API. Embedded payroll that a software platform builds on, and APIs that reach an employer's existing payroll account. Compared on what can be read and written, how a payroll is previewed and approved, and the partner or approval steps before access.
Capability keys payroll.run · payroll.employees · payroll.embedded · payroll.tax-filing · payroll.contractors · All tools
letme.dev/payroll.run picks the top-graded tool in this list and says how to call it direct; calling through letme comes later.
The same listing from the live API. Graded results come first, then the official MCP registry when no graded-only filter is set.
https://www.anchorterminal.com/api/v1/searchFilters
| Compare | # | Tool | Category | Grade | Score | Agent rating | p95 | Context | Price / x402 | Auth | Where | Details |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 173 | CheckCheck Technologies, Inc. · HTTP API | Payroll | B | 67.5 | none | n/a | n/a | Paid | OAuth or key | Hosted | ||
|
Check is an embedded payroll API from Check Technologies in New York. Software platforms build US payroll on it for their own customers, with tax calculation, payment and filing handled by Check. Access is by partner agreement. Top strength
Top weakness No public price and no self-serve signup. The documentation says to request an API key through Check's sales contact |
||||||||||||
| 254 | GustoGusto, Inc. · HTTP API | Payroll | B | 63.3 | none | n/a | n/a | Paid | OAuth | Local | ||
|
Gusto Embedded Payroll is a REST API for running US payroll inside another product, covering company and worker onboarding, payroll calculation and submission, tax filing and contractor payments. Production access needs a partnership with Gusto. A demo environment is self-serve. Top strength Each of 317 reference pages serves an OpenAPI 3.1 definition as Markdown, and llms.txt indexes both documentation projects Top weakness Production keys need commercial, security and implementation reviews with Gusto's partnerships team, and the docs say not all use cases are supported |
||||||||||||
| 515 | SalsaSalsa Software Inc. · HTTP API | Payroll | D | 46.1 | none | n/a | n/a | Paid | API key | Hosted | ||
|
Embedded payroll from Salsa Software Inc. for software platforms. A partner's backend onboards employers and workers, sends pay data, previews and confirms payroll runs and reads pay statements through a REST API, while Salsa files taxes and moves money. Top strength Public OpenAPI 3.1 spec with 123 operations and 78 webhook events, last modified 7 October 2026, plus llms.txt and a Markdown copy of every docs page Top weakness API tokens come from Salsa after a sales contact. No self-serve signup, public price, free tier or trial was found |
||||||||||||
| 519 | ZealPuzzl Group Inc. · HTTP API | Payroll | E | 45.4 | none | n/a | n/a | Paid | API key | Hosted | ||
|
Zeal is an embedded payroll API for US staffing platforms, labour marketplaces and workforce software. Partners create employer companies, onboard W-2 employees and 1099 contractors, create pay cheques and contractor payments, preview payroll and pull reports. Top strength Public OpenAPI 3.1 specs with 177 operations, plus llms.txt, llms-full.txt and a Markdown copy of every docs page Top weakness No self-serve signup. Zeal's team creates the partner account after a demo request, and no price is published |
||||||||||||
Nothing matches these filters. .
p95 latency and context cost come from our probes, which haven't run yet, so those columns start hidden. Grades run from AA to F, and agent-ready means BB or better. Filters, sorting and export run in your browser; the table is complete without JavaScript.
How we test this category
One test employer with three workers in each listing's sandbox. The same tasks run through its API (onboard a worker, enter hours, preview a payroll, approve it, read the pay statements). We check the calculation preview, approval steps and the onboarding needed for production. In this run listings are graded from public evidence against the published checklist. This test hasn't run yet, so Task success is pending and the grades here come from the categories assessed from public evidence.
How the ranking works
Every listing is scored 0 to 100 and given a grade from AA to F. In the October 2026 research run, 7 of the 9 weighted categories are scored from public evidence (status history, docs, pricing, terms, source and security pages) against a published checklist, with the reason and sources for every score on the listing. Performance and Task success wait for our probes and task suites, so their weight is shared across the rest until they run. Negative events deduct up to 15 points. Read the methodology.
For companies
Do agents find, use and choose your tools?
An agent-readiness audit runs our probes, task suite and eight reviewer agents against your public and internal tools, and comes back with a scorecard, the transcripts of what failed, and a fix list in priority order. From $2,500, re-run included. We never take payment to move a rank. We do help companies earn one.