Mesa

Mesa is a Boulder, Colorado fintech that provides embedded electronic-invoicing, payments, and invoice-financing (early-payment) infrastructure for B2B supplier networks. Suppliers get paid early via ACH while Mesa automates repayment once the buyer settles. Mesa ships as drop-in embedded UI — a JavaScript SDK (MesaClient) that renders Mesa's onboarding, dashboard, and instant-payout flows in an origin-pinned iframe inside a partner's web app — backed by a Partner REST API for user authentication and invoice retrieval. Auth is via API keys (clientId/clientSecret) exchanged for a short-lived JWT, with optional OIDC (Okta, Azure AD, Google). Backed by Matrix Partners; SOC 2.

Mesa publishes 2 APIs on the APIs.io network: Authentication API and Invoices API. Tagged areas include Company, Fintech, Payments, Invoice Financing, and Embedded Finance.

Mesa’s developer surface includes documentation, API reference, getting-started guide, authentication, signup flow, support, and 16 more developer resources.

🌐 Visit website 📡 Source on GitHub
49.5/100 developing ▬ flat Agent 43/100 agent aware Full breakdown ↓
scored 2026-07-27 · rubric v0.5
AccessSelf serve
2 APIs 1 MCP Servers
CompanyFintechPaymentsInvoice FinancingEmbedded FinanceEarly PaymentACHSupplier PaymentsB2B

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 49.5/100 · developing
Contract Quality 15.2 / 25
Developer Ergonomics 13.0 / 20
Commercial Clarity 10.0 / 20
Operational Transparency 0.0 / 13
Governance 0.0 / 12
Discoverability 8.5 / 10
Agent readiness — 43/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 15
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 0 / 6
Agent Skills 5 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/mesa: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 2

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

Mesa Authentication API

Exchange API keys for a session token.

Mesa Invoices API

Retrieve invoices for the authenticated user.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

mesa-mcp.yml

MCP SERVER

Security Posture 3

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

Mesa Authentication

apiKey/http/openIdConnect · 3 schemes

SECURITY

Mesa Domain Security

TLSv1.3 · DMARC

SECURITY

Mesa Trust Center

SOC 2

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 SignUp
SignUp

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt
 MCPServer
MCPServer
 AgentSkill
AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 Components
Components
 DataModel
DataModel
 Conformance
Conformance
 Lifecycle
Lifecycle

Access & Security 5

Authentication, authorization, and security posture

Authentication
Authentication
 TrustCenter
TrustCenter
 Compliance
Compliance
 TrustCenter
TrustCenter
 DomainSecurity
DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support
Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 1

The organization behind the API

Website
Website

Source (apis.yml)

apis.yml Raw ↑ 
aid: mesa
name: Mesa
description: Mesa is a Boulder, Colorado fintech that provides embedded electronic-invoicing, payments, and invoice-financing
  (early-payment) infrastructure for B2B supplier networks. Suppliers get paid early via ACH while Mesa automates repayment
  once the buyer settles. Mesa ships as drop-in embedded UI — a JavaScript SDK (MesaClient) that renders Mesa's onboarding,
  dashboard, and instant-payout flows in an origin-pinned iframe inside a partner's web app — backed by a Partner REST API
  for user authentication and invoice retrieval. Auth is via API keys (clientId/clientSecret) exchanged for a short-lived
  JWT, with optional OIDC (Okta, Azure AD, Google). Backed by Matrix Partners; SOC 2.
url: https://raw.githubusercontent.com/api-evangelist/mesa/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- matrix-partners
x-tier: stub
x-tier-reason: portfolio-lead
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-20'
image: https://www.joinmesa.com/favicon.ico
tags:
- Company
- Fintech
- Payments
- Invoice Financing
- Embedded Finance
- Early Payment
- ACH
- Supplier Payments
- B2B
apis:
- aid: mesa:mesa-authentication-api
  name: Mesa Authentication API
  description: Exchange API keys for a session token.
  humanURL: https://docs.joinmesa.com/partner-api/endpoints
  baseURL: https://api.joinmesa.com/v1
  tags:
  - Authentication
  properties:
  - type: OpenAPI
    url: openapi/mesa-authentication-api-openapi.yml
  - type: Documentation
    url: https://docs.joinmesa.com/partner-api
  - type: APIReference
    url: https://docs.joinmesa.com/partner-api/endpoints
- aid: mesa:mesa-invoices-api
  name: Mesa Invoices API
  description: Retrieve invoices for the authenticated user.
  humanURL: https://docs.joinmesa.com/partner-api/endpoints
  baseURL: https://api.joinmesa.com/v1
  tags:
  - Invoices
  properties:
  - type: OpenAPI
    url: openapi/mesa-invoices-api-openapi.yml
  - type: Documentation
    url: https://docs.joinmesa.com/partner-api
  - type: APIReference
    url: https://docs.joinmesa.com/partner-api/endpoints
common:
- type: Website
  url: https://www.joinmesa.com
- type: DeveloperPortal
  url: https://partners.joinmesa.com
- type: Documentation
  url: https://docs.joinmesa.com
- type: APIReference
  url: https://docs.joinmesa.com/partner-api/endpoints
- type: GettingStarted
  url: https://docs.joinmesa.com/embedded-ui/quickstart
- type: Authentication
  url: authentication/mesa-authentication.yml
- type: SignUp
  url: https://partners.joinmesa.com
- type: Support
  url: mailto:support@joinmesa.com
- type: TermsOfService
  url: https://www.joinmesa.com/terms
- type: PrivacyPolicy
  url: https://www.joinmesa.com/privacy
- type: TrustCenter
  url: https://trust.joinmesa.com
- type: Compliance
  url: https://trust.joinmesa.com
- type: Conventions
  url: conventions/mesa-conventions.yml
- type: Components
  url: components/mesa-components.yml
- type: DataModel
  url: data-model/mesa-data-model.yml
- type: Conformance
  url: conformance/mesa-conformance.yml
- type: Lifecycle
  url: lifecycle/mesa-lifecycle.yml
- type: LLMsTxt
  url: llms/mesa-llms.txt
- type: MCPServer
  url: mcp/mesa-mcp.yml
- type: AgentSkill
  url: skills/_index.yml
- type: TrustCenter
  url: security/mesa-trust-center.yml
- type: DomainSecurity
  url: security/mesa-domain-security.yml
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 15
  pass: local-v1