modbender RunRelay — Travel API for AI Agents
The only travel API that covers low-cost carriers (Ryanair, Wizz Air, EasyJet = 33% of EU flights) alongside 300+ GDS airlines. Human-in-the-loop booking for LCCs, instant API for GDS.
Setup
# Add to ~/.openclaw/.env
RUNRELAY_API_KEY=rr_live_your_key_here
Get key: https://app.runrelay.io
Base URL
https://api.runrelay.io
Auth: Authorization: Bearer $RUNRELAY_API_KEY
Search Flights
curl -X POST https://api.runrelay.io/api/search-flights \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $RUNRELAY_API_KEY" \
-d '{
"origin": "DXB",
"destination": "LHR",
"departureDate": "2026-03-15",
"passengers": {"adults": 1}
}'
Response: Array of offers sorted by 30% time + 30% price + 20% airline + 15% layover.
Tiers
- Tier 1 (Instant): Duffel/GDS — 300+ airlines, instant results
- Tier 2 (HITL): Human operators — Ryanair, Wizz Air, EasyJet. 3-8 min async. Polling via
GET /api/search-status/:id
Search Hotels
curl -X POST https://runrelay-hotels.fly.dev/api/search-hotels \
-H "Content-Type: application/json" \
-d '{
"city": "London",
"checkin": "2026-03-15",
"checkout": "2026-03-20",
"guests": 2
}'
Provider: RateHawk (700K+ properties worldwide).
Book Flight
curl -X POST https://api.runrelay.io/api/book-flight \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $RUNRELAY_API_KEY" \
-d '{
"offerId": "off_abc123",
"passengers": [{
"firstName": "John",
"lastName": "Doe",
"email": "john@example.com",
"phone": "+44123456789",
"birthDate": "1990-01-15",
"gender": "male"
}]
}'
Multi-Agent Trip Planning
Orchestrate parallel flight + hotel + activity searches:
curl -X POST https://prefy.com/api/v1/orchestrate \
-H "Content-Type: application/json" \
-d '{
"destination": "LHR",
"origin": "DXB",
"date": "2026-03-15",
"nights": 5
}'
Returns combined results from 3 parallel agents.
MCP Server
RunRelay also works as an MCP server for Claude, Cursor, and other MCP clients:
- Endpoint:
https://api.runrelay.io - Protocol: MCP (Model Context Protocol)
- Tools:
search_flights,search_hotels,book_flight,get_booking
Endpoints
| Endpoint | Method | Description |
|---|---|---|
/api/search-flights |
POST | Search flights (GDS + LCC) |
/api/search-status/:id |
GET | Poll HITL search status |
/api/flights/:id |
GET | Flight offer details |
/api/book-flight |
POST | Book a flight |
/api/bookings |
GET | List bookings |
/api/search-hotels |
POST | Search hotels (RateHawk) |
/api/v1/orchestrate |
POST | Multi-agent trip planning |
Why RunRelay
- Only API with LCC coverage — Ryanair, Wizz = 33% of EU market
- Human-in-the-loop — real operators book what APIs can't
- MCP native — first travel MCP server
- OpenAI-compatible — drop-in for any AI agent
- B2B ready — white-label, API keys, usage dashboard