How Callio Works

One key. One gateway. A predictable way to call external APIs from products, agents, and automation workflows.

1. Pick the tools your agent needs

Browse the catalog by category: search, communications, data, payments, identity, AI tooling, and more. Find the right APIs for whatever your agent needs to accomplish, in one place.

Browse APIs

📧 SendGrid

🤖 OpenAI

💬 Slack

📊 Analytics

🔍 Scraper

🌐 Globe

2. Create a Callio key

Generate a Callio key from your dashboard. Use it to authenticate gateway calls while Callio handles provider routing, usage logs, and upstream credential injection.

Manage keys

// Your Callio API Key

callio_a1b2c3d4e5f6g7h8i9j0k1l2

3. Call the gateway

Call the HTTP proxy directly from any backend, agent runtime, or automation tool. The request path identifies the provider and endpoint while your Callio key controls access.

// Proxy route API call example

curl -X GET \
  "https://callio.dev/api/proxy/jsonplaceholder/posts/1" \
  -H "Authorization: Bearer callio_..."

Why builders choose Callio

One key, every tool

No more juggling N provider signups and N auth flows. One Callio key handles the whole catalog.

Consistent proxy shape

Use one URL pattern across providers instead of rebuilding auth, headers, and endpoint handling for every integration.

BYOK + encrypted

Save your provider keys once. They are encrypted at rest and injected at the proxy, without exposing raw secrets in dashboard logs.

Observable by default

Track status codes, latency, usage, and failures from one dashboard before integration issues reach users.