Verification API vs building your own SAML SSO

If you have never run a SAML service provider, the scope is easy to underestimate. The core work is not reading an XML assertion — it is everything around it:

• Federation membership. You register as a service provider with each federation you want to reach, publish metadata, and comply with its policy. Reaching institutions worldwide means dealing with eduGAIN's aggregate and its member federations.
• Metadata lifecycle. Identity providers add, remove and rename themselves constantly. Someone has to fetch, parse, validate and store that metadata — and keep it fresh — or logins silently break.
• Certificate rotation. Entities rotate signing certificates on their own schedule. Miss a rotation and verification fails.
• Per-IdP behaviour. Support for NameID formats varies. Some providers advertise none, some reject certain requests, and some require particular settings. A request that works for most institutions can fail for a specific one you have never heard of.
• The identifier problem. Deciding what counts as a stable, usable identifier across thousands of providers — and handling the cases where there is not one — is a design problem, not just a parsing problem.
• Ongoing operations. This is not a one-time integration. It is a service you now run, monitor and debug.

None of it is impossible; all of it is a distraction from your actual product.

You do not have to choose once and forever. A sensible path:

1. Start hosted. Ship the academic gate with the two endpoints, so the product outcome is live while you evaluate the operational load.
2. Measure what you would own. Track the metadata failures, per-IdP exceptions and certificate events the hosted service absorbs for you. That list is your build backlog if you ever decide to.
3. Revisit only with a reason. Build your own SP when you have a concrete requirement the API cannot meet — a bespoke attribute, a policy mandate, or a scale where the operational cost is clearly justified.
4. Keep the contract if you migrate. Because you consume authIdentifier, entityId and affiliations, you can swap the implementation behind that interface later without rewriting your product logic.

If your need is a platform feature rather than protocol control, the research platforms use case shows the hosted path in full.

The line item people forget is not the protocol library — it is the standing service:

• Engineering time. Initial integration plus the recurring work of chasing metadata and provider changes.
• Operations. Monitoring, alerting and incident response when a login path breaks for one institution out of thousands.
• Federation overhead. eduGAIN participation is reached through a national federation; membership policy and any fees vary by federation, and each one you join is a separate relationship.
• Opportunity cost. Every hour on identity plumbing is an hour not spent on your product.

Studid's side of that ledger is two calls, a free API and a documented contract. The trade is control for time, and for most teams building an academic gate, the time is the scarcer resource.

If you do proceed, be honest about the shape of the work. A production service provider is not one library; it is a small system with a long tail:

• An SP endpoint set. Request generation, assertion consumption, and a signed-metadata endpoint the IdPs can fetch.
• A metadata consumer. Fetch, parse, validate, cache and version the federation aggregate — plus a refresh schedule and failure alerting.
• Certificate handling. Trust anchors per IdP, rotation monitoring, and a safe path to update them without an outage.
• A per-IdP policy layer. NameID format selection, AllowCreate behaviour, and exceptions for providers that deviate from the spec.
• An identifier strategy. The rules that turn heterogeneous assertions into a stable identifier, including the cases where none exists.
• Operations. Dashboards, alerts and a runbook for the subset of institutions that break on any given day.

None of these is exotic, and a competent identity engineer can build each one. The point is that they are ongoing: items on a runbook, not checkboxes on a launch plan. The hosted alternative is not that the work is impossible, but that it is not your work to own.

An evaluation checklist. If you are seriously considering building, confirm:

• Who is the on-call owner for identity incidents?
• Can you name the federations you must join, and their membership terms?
• How will you handle an IdP that rotates a certificate without notice?
• What is your plan for an institution that advertises no NameID format?
• Is there a bespoke attribute you truly need, or is entityId enough?

Building is a defensible choice, and it is worth being clear about when:

• You are the service provider of record. Policy, audit or a contractual obligation may require that the SP is yours, not a vendor's.
• You need a bespoke attribute. If the decision depends on a claim no standard provider releases and no API normalizes, you own the parsing.
• Identity is your product. If federation and identity plumbing are core to what you sell, the control is worth the operations.
• You already run one. If you operate other SPs and have the tooling, monitoring and on-call, this is a marginal addition rather than a new capability.

For everyone else — teams whose product is not identity infrastructure — the two-endpoint contract is the shorter path, and it leaves the hard operational parts to someone whose job they are.

• The returned contract is documented in the integration guide.
• The supported coverage is on the network page.
• The implementation is open on GitHub.

Methodology: This page reflects Studid's own engineering experience operating a SAML service provider across federated academic identity, as of September 2026.