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About Evlio

We documented APIs for 20,000 companies. Docs were never the hard part.

Thousands of teams arrived at Evlio ready to publish, then found nobody could say what their API surface was, who called it, or what would break.

20,000COMPANIES ON EVLIO
YCY COMBINATOR BACKED
AtlassianVENTURES INVESTOR
Fortune 500IN PRODUCTION TODAY
TEAMS THAT TRUST EVLIO WHERE APIS CANNOT GO DOWN
Ticketmaster
Corpay
FISCorgi
SimilarWeb
TNS
Ticketmaster, FIS, Corpay, SimilarWeb. They run on Evlio, and Evlio is the layer they kept asking us for.
2021Evlio launchesAPI docs that write themselves
202320,000 catalogsThe same six questions, every time
2025Agents arriveThe human buffer disappears
NowEvlioThe layer they kept asking for
Why we built it

Why we built Evlio: six questions we could never answer

Teams arrived at the last mile, docs blocking the launch. Then the questions started, and none of them were about docs.

ASKED IN ONBOARDING, AGAIN01 / 06
“How many endpoints do we actually have?”
answer
Nobody knew. The spec covered a third; the rest lived in code three teams had touched.
THE QUEUE
Docs were the symptom. The disease is that almost nobody has a system of record for their own APIs.
What agents changed

What agents changed: same bad field name, two very different Tuesdays

A developer, 2019reads the error, stops
POST /payouts { amount, currency }
← 400 "fee_mode" is required
reads the error
greps the codebase, finds an enum
fixes it once, ships
CALLS1
DAMAGEnone
ClaudeAn agent, todayincident
POST /payouts × 60 args mutating
← 400 "fee_mode" is required
guesses fee_mode: "standard" → 201
no idempotency key, retries anyway
14 duplicate payouts created
reports success to its user
CALLS60
DUPLICATE PAYOUTS14
P952.4s
Evlio brings your APIs into view, ready for developers and AI agents.
Who is building it

Who is building Evlio: people who have carried the pager for an API

ex-MSFTBuilt at Microsoft scaleWhere one bad schema decision reaches millions of callers before anyone notices.
ex-GOOGOperated at Google scaleThousands of internal services, and the versioning discipline that survives them.
20,000API catalogs seenThe good, the undocumented, and the ones held together by one engineer’s memory.
∞Pages carriedPlatform leads who ran the gateways and know which parts should never have been manual.
MANIFESTOfour opinions the product is built on
01The code is the only honest sourceA document a human maintains is a document that will be wrong by Thursday.
02Quality has to be a numberScoring every endpoint turns an argument into a task list.
03Governance that cannot say no is theaterA report about a breaking change is not governance. A publish that gets blocked is.
04Agents are consumers, not a featureIf an agent can call your API, it deserves the same auth, limits, and logs as any partner.

FAQ

Who is behind Evlio?

The team at Evlio, the API documentation platform used by 20,000 companies. Evlio is their answer to what API management needs to become when agents join the consumer list.

Why did we build Evlio?

Years of making API docs readable for humans made the gap obvious: AI agents do not read prose, they read schemas and act on them. Evlio gives APIs the catalog, contracts, and governed access that agents require.

Who operates Evlio?

Evlio is operated by Evlio Inc. The platform lives at evlio.xyz, with documentation at evlio.xyz/docs.

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