Callio

The API layer for AI agents.One key. Every tool.

Connect your AI agents and LLM applications to any external tool in minutes. A secure, zero-overhead API gateway with native MCP support.

Try Callio Book a Demo
MCP Native Integrations
ClaudeClaudeDesktop & Code
GeminiAPI & Agent
CursorCursorAI Code IDE

Orchestrate API requests from any agent

Choose an upstream target provider API below and trace how the Callio Gateway maps keys, processes headers, and forwards calls.

Sources (AI Stack)
Cursor MCP
Agentic IDE tool calls
Python / Node SDK
Standard backend scripts
Claude Desktop
MCP environment integration
Callio Hub
BYOK Active
Single Gateway handles auth injection, rates, & SSL.
Targets (Unified Proxy)
gateway proxy inspector
https://api.callio.dev/v1/proxy/slack/chat.postMessage
Outgoing Proxy RequestPOST
> Host: api.callio.dev
> Authorization: Bearer callio_live_••••••••
> X-Upstream-Key: injected_by_callio
> Content-Type: application/json
{
  "channel": "#ops-alerts",
  "text": "🟢 Agent task completed in 420ms"
}
Upstream Provider Response200 OK
< HTTP/1.1 200 OK
< Content-Type: application/json
< X-Callio-Time: 128ms
< X-Callio-Quota: 2,341/10,000
{
  "ok": true,
  "channel": "C03248",
  "ts": "1778796622.04",
  "message": {
    "text": "🟢 Agent task completed in 420ms",
    "type": "message"
  }
}
Interactive Playground

Test and prototype in real-time

Explore endpoints, configure parameters, and inspect responses inside the interactive API Playground. Securely test upstream routes using your sandbox or production keys, and copy production-ready code snippets instantly.

API Playground•openai
Share Link
Save Request
Send Request
Endpoints (1)
POST
/v1/chat/completions

Create chat completions using gpt-4o or gpt-4-turbo

Saved Requests (1)
POST /v1/chat/completions
POST • 5/22/2026
Load
Recent Runs (10)Clear
POST /v1/chat/completions
200142ms0.4KB
Rerun
POST /v1/chat/completions
200189ms0.4KB
Rerun

Paste your callio_ key from Dashboard → Keys. Requests here use the same Bearer auth as the proxy and MCP.

Show
Parameters
Try Example
modelstring

The model slug to use upstream (e.g. gpt-4o)

temperaturenumber

Sampling temperature between 0 and 2

max_tokensinteger

The maximum number of tokens to generate

This playground reflects the live API test runner. Use your custom keys to request completions directly in-browser.

cURLJavaScriptPython
Copy
curl -X POST \
  "https://www.callio.dev/api/proxy/openai/v1/chat/completions" \
  -H "Authorization: Bearer callio_test_7bb0f9563b512baa269c6a9f1bdce6a9" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-4o",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'
Response
200 OK142ms0.4KB
Copy
{
  "id": "chatcmpl-123",
  "object": "chat.completion",
  "created": 1778796622,
  "model": "gpt-4o",
  "choices": [
    {
      "index": 0,
      "message": { "role": "assistant", "content": "Hello! I am your AI assistant." },
      "finish_reason": "stop"
    }
  ],
  "usage": { "prompt_tokens": 15, "completion_tokens": 12, "total_tokens": 27 }
}
Team Collaboration

Collaborative agent operations

Scale agent builders across your organization. Callio Team Workspaces allow multiple developers to share credentials and monitor central usage telemetry, while restricting sensitive billing and administrative controls.

Team Workspace

Manage members and invites for Personal Workspace.

MembersAPI Access PoliciesUsage LimitsSettings
Active Members
3
O
Oliver Soper
oliver@company.com
Owner
All Keys (Read/Write)
Active now
S
Sarah Jenkins
sarah@company.com
Admin
All Keys (Read/Write)
Active 2h ago
L
Lucas Martinez
lucas@company.com
Developer
Sandbox Only
Active 1d ago
Pending Invites
1
emma@company.com
Developer
June 2, 2026
Pending

Invite new member

Send Invite
Workspace Security

Members of this workspace have full access to view API Keys and usage logs. They cannot access your personal billing information or delete the workspace.

Unified Telemetry

Observe, manage, and scale traffic

Monitor request volumes, track execution success rates, and analyze average latencies across all your upstream integrations from a single dashboard. Keep your keys safe and see exactly how your AI agents are communicating in real-time.

Request Logs

View the last 100 API requests made with your keys.

Requests
9
Failures
0
Avg Latency
79ms
APIs Touched
3
Request Explorer
All APIs
All methods
All statuses
TimestampAPIMethod & PathKeyStatus
03:53:14 PMopenai
POST/v1/chat/completions
Prod Key 1200
03:53:13 PMopenai
POST/v1/chat/completions
Prod Key 1200
03:53:12 PMopenai
POST/v1/chat/completions
Prod Key 1200
03:53:11 PMopen-meteo
GET/forecast
Sandbox200
03:53:09 PMopen-meteo
GET/forecast
Sandbox200
03:52:47 PMusgs-earthquake
GET/query
Sandbox200
03:52:45 PMopenai
POST/v1/embeddings
Prod Key 1200

Request Details

Inspect request parameters & re-run.

API Provideropenai
Method & Path
POST/v1/chat/completions
Status200
Latency240ms

Dashboard

Your keys, traffic, and tools for the agent you're shipping.

Agent Connections
1/ 2
Requests This Month
9/ 500
Plan
Free

API Requests (30 Days)

Speed & Latency

/openai/v1/chat/completions
/open-meteo/forecast
Developer SDKs & Configurations

Plugs natively into your stack

Callio is build-agnostic. Drop the server into your Cursor config, add it as a Claude desktop tool, or import our Python and JavaScript SDKs. One single API key powers everything.

Works with any agent framework or orchestration layer.
Bring Your Own Keys (BYOK) loaded on the dashboard.
SSL secure routing with auto-retries on 5xx errors.
Read the API documentation
{
  "mcpServers": {
    "callio": {
      "command": "npx",
      "args": ["-y", "github:hmadhsan/callio-mcp"],
      "env": {
        "CALLIO_API_KEY": "callio_your_api_key"
      }
    }
  }
}

167+ integrations with the systems that you are already using

StripeStripe
SlackSlack
GitHubGitHub
Google CloudGoogle Cloud
Anthropic ClaudeAnthropic Claude
ZendeskZendesk
LookerLooker
StripeStripe
SlackSlack
GitHubGitHub
Google CloudGoogle Cloud
Anthropic ClaudeAnthropic Claude
ZendeskZendesk
LookerLooker
OpenAI GPT-4oOpenAI GPT-4o
Amazon S3Amazon S3
Google MapsGoogle Maps
Supabase PGSupabase PG
Pinecone DbPinecone Db
LinearLinear
TableauTableau
OpenAI GPT-4oOpenAI GPT-4o
Amazon S3Amazon S3
Google MapsGoogle Maps
Supabase PGSupabase PG
Pinecone DbPinecone Db
LinearLinear
TableauTableau
Shopify StoreShopify Store
DiscordDiscord
Google CalendarGoogle Calendar
Twilio SMSTwilio SMS
SalesforceSalesforce
NotionNotion
SnowflakeSnowflake
ResendResend
HubSpotHubSpot
ChargebeeChargebee
Google DriveGoogle Drive
Shopify StoreShopify Store
DiscordDiscord
Google CalendarGoogle Calendar
Twilio SMSTwilio SMS
SalesforceSalesforce
NotionNotion
SnowflakeSnowflake
ResendResend
HubSpotHubSpot
ChargebeeChargebee
Google DriveGoogle Drive

Frequently Asked Questions

Everything you need to know about Callio's features and infrastructure.

What is Callio?
Callio is the high-performance unified API gateway for AI agents and LLM applications. One key and one endpoint lets your agent securely interface with 167+ external APIs without SDK bloat.
How is Callio different from standard API clients?
Instead of spending hours writing auth boilerplate, configuring custom headers, handling rate-limits, and routing logs for every provider, you connect your agent to Callio. We handle credentials injection, retry logic, timeout termination, and trace logging out of the box.
How does the Model Context Protocol (MCP) work?
Callio runs a compliant MCP server. Drop our command config into Cursor, Claude Desktop, Claude Code, or Antigravity, and your AI assistant immediately inherits tool calls for all 167 APIs using your single Callio key. View setup details.
Are my provider API credentials safe with Callio?
Absolutely. We enforce bank-grade security. All provider credentials (BYOK) are encrypted at rest using AES-256-GCM. Furthermore, Callio is zero-data logging: we pass through payload bodies and only store metadata (status, latency) for your dashboard.
How do I start and what are the pricing plans?
Our sandbox plan is free forever and includes 500 requests to help you test integrations. Production plans start at $49/month for builder workloads. Check our pricing table for limits.

Stop writing API boilerplate and start building your agents.

Get the unified API gateway you need to keep credentials secure, connections stable, and integrations scalable—all with a single key.

Get Started Book a Demo