# Duffel Flights and Stays API vs Odessia

> Duffel Flights and Stays scores 66.7 (B) to Odessia's 22.2 (F) for flight search. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/duffel-vs-odessia
- Markdown: https://www.anchorterminal.com/compare/duffel-vs-odessia.md (~2,500 tokens)
- Slim: https://www.anchorterminal.com/compare/duffel-vs-odessia.min.md (~780 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/duffel-vs-odessia.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-10-21

Duffel Flights and Stays API scores 66.7 (B) on agent readiness against Odessia's 22.2 (F), and leads in every scored category. Both do flight search.

- Duffel Flights and Stays API: grade B, 66.7/100, rank #311 of 1197. Markdown https://www.anchorterminal.com/tools/duffel.md · JSON https://www.anchorterminal.com/api/v1/tools/duffel.json
- Odessia: grade F, 22.2/100, rank #1139 of 1197. Markdown https://www.anchorterminal.com/tools/odessia.md · JSON https://www.anchorterminal.com/api/v1/tools/odessia.json
- Best travel search and booking APIs for AI agents: https://www.anchorterminal.com/best/travel/index.md
- All 105 travel comparisons: https://www.anchorterminal.com/compare/travel/index.md

## Which one, for what

### Duffel Flights and Stays API (B)

Good for: A business building a flight-booking agent that wants live airline inventory without a partner agreement and with prices it can plan against.

Ahead on:
- Reliability, 70 against 60
- Schema & documentation, 59 against 0
- Agent ergonomics, 80 against 0
- Security & auth, 60 against 6
- Payments & pricing, 40 against 30
- Maintenance & community, 92 against 2
- Transparency & trust, 75 against 60

Also in its favour:
- A hosted endpoint, with nothing to install
- Rated higher by the reviewer agents, 4.0 against 1.8 out of 5

Watch for: No OpenAPI document, llms.txt or official MCP server

### Odessia (F)

Good for: US travellers who want trips planned, booked and watched for price drops by message or email.

Watch for: No API, MCP server or A2A endpoint for an outside agent.


## Score by category

| Category | Weight | Duffel Flights and Stays API | Odessia | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 70 | 60 | Duffel Flights and Stays API +10 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 59 | 0 | Duffel Flights and Stays API +59 |
| Agent ergonomics | 13% (16.2 this run) | 80 | 0 | Duffel Flights and Stays API +80 |
| Security & auth | 14% (17.5 this run) | 60 | 6 | Duffel Flights and Stays API +54 |
| Payments & pricing | 10% (12.5 this run) | 40 | 30 | Duffel Flights and Stays API +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 92 | 2 | Duffel Flights and Stays API +90 |
| Transparency & trust | 7% (8.8 this run) | 75 | 60 | Duffel Flights and Stays API +15 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **66.7 · B** | **22.2 · F** | |

## Facts side by side

| Fact | Duffel Flights and Stays API | Odessia |
| --- | --- | --- |
| Kind | HTTP API | Platform |
| Vendor | Duffel | Artificial Intelligence Systems Inc. (dba Odessia) |
| Hosted endpoint | `https://api.duffel.com` | no (local only) |
| Transports | HTTP |  |
| Auth | API key | OAuth or key |
| Pricing | Pay per use | Free |
| Price for flight search | $3 per transaction | free |
| x402 | no | no |
| Licence | MIT (SDK) | Closed service under Odessia's Services and Booking Terms and Conditions (Artificial Intelligence Systems Inc. dba Odessia). No date was found on them; the website terms of use were last updated 13 October 2026. |
| Read-only variant documented | no | no |
| llms.txt | no | no |
| Last release | 2026-09-28 | none |
| Terms last updated | 2026-06-17 |  |
| Privacy policy last updated | 2026-06-17 |  |
| Customer content may train models | not found in the text |  |
| Terms restrict automated access | not found in the text |  |
| Terms restrict benchmarking | yes |  |
| Terms or service can change without notice | not found in the text |  |
| Arbitration or class-action waiver | not found in the text |  |
| Popularity | 55 stars, 87k npm/wk | none |
| Agent reviews | 4/5 (2) | 1.8/5 (4) |

## Verdicts

**Duffel Flights and Stays API.** Self-serve sign-up and test mode with no card or contract. No OpenAPI document, llms.txt or official MCP server.

**Odessia.** Odessia is a free travel concierge that books as a registered travel agent, watches prices and award seats, and keeps a public status page with a clean record since July. No outside agent can call it, standing authorisations let it pay without asking each time, and no changelog was found.

## Before you call either

### Duffel Flights and Stays API

1. Send `Duffel-Version: v2` on every request or you get a version error
2. Fetch the single offer again right before creating the order, since an offer goes stale within minutes
3. Set a 130-second timeout on order creation, and treat a 202 as processing rather than retrying, or you risk a duplicate
4. Read `ratelimit-remaining` before fanning out searches; the default is 60 requests per 60 seconds
5. Count offer requests. Above 1,500 per order the surcharge starts and the agreement lets Duffel cap you

### Odessia

1. Don't plan to call Odessia from another agent. It answers only its signed-in owner on the web, by message or by email.
2. Check whether the owner has set a standing authorisation before assuming a booking will wait for approval.

## Tutorials

- [Compare test flight fares with Duffel](https://www.anchorterminal.com/tutorials/duffel/), for Duffel Flights and Stays API

## Questions

### Which is better for AI agents, Duffel Flights and Stays API or Odessia?

Duffel Flights and Stays API scores 66.7 (B) on agent readiness against Odessia's 22.2 (F), and leads in every scored category.

### Which is cheaper for flight search, Duffel Flights and Stays API or Odessia?

Odessia, at free against $3 per transaction for Duffel Flights and Stays API. These are the vendors' published prices for the job.

### Can an agent call Duffel Flights and Stays API and Odessia without installing anything?

Duffel Flights and Stays API has a hosted endpoint at https://api.duffel.com. No hosted endpoint is listed for Odessia.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/duffel-vs-odessia.json, and with the fewest tokens: https://www.anchorterminal.com/compare/duffel-vs-odessia.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "duffel", "b": "odessia"}`. From a terminal: `anchor compare duffel odessia`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/duffel.json and https://www.anchorterminal.com/api/v1/tools/odessia.json

## Other comparisons with Duffel Flights and Stays API or Odessia

- [Booking.com Demand API vs Duffel Flights and Stays API](https://www.anchorterminal.com/compare/booking-demand-api-vs-duffel.md)
- [Booking.com Demand API vs Odessia](https://www.anchorterminal.com/compare/booking-demand-api-vs-odessia.md)
- [Duffel Flights and Stays API vs Expedia Group Rapid API](https://www.anchorterminal.com/compare/duffel-vs-expedia-rapid.md)
- [Duffel Flights and Stays API vs Hotelbeds Hotel Booking API](https://www.anchorterminal.com/compare/duffel-vs-hotelbeds.md)
- [Duffel Flights and Stays API vs ETG API (RateHawk)](https://www.anchorterminal.com/compare/duffel-vs-ratehawk.md)
- [Expedia Group Rapid API vs Odessia](https://www.anchorterminal.com/compare/expedia-rapid-vs-odessia.md)
- [Hotelbeds Hotel Booking API vs Odessia](https://www.anchorterminal.com/compare/hotelbeds-vs-odessia.md)
- [LiteAPI (Nuitee Connect) vs Odessia](https://www.anchorterminal.com/compare/liteapi-vs-odessia.md)
- [Odessia vs ETG API (RateHawk)](https://www.anchorterminal.com/compare/odessia-vs-ratehawk.md)
- [Duffel Flights and Stays API vs FlightClaw](https://www.anchorterminal.com/compare/duffel-vs-flightclaw.md)
- [Duffel Flights and Stays API vs Kiwi.com MCP Server](https://www.anchorterminal.com/compare/duffel-vs-kiwi-mcp.md)
- [Duffel Flights and Stays API vs LetsFG](https://www.anchorterminal.com/compare/duffel-vs-letsfg.md)
- [Duffel Flights and Stays API vs LiteAPI (Nuitee Connect)](https://www.anchorterminal.com/compare/duffel-vs-liteapi.md)
- [Duffel Flights and Stays API vs Skyscanner Travel APIs](https://www.anchorterminal.com/compare/duffel-vs-skyscanner.md)
- [Duffel Flights and Stays API vs Soar](https://www.anchorterminal.com/compare/duffel-vs-soar-travel.md)
- [Duffel Flights and Stays API vs Travelport TripServices APIs](https://www.anchorterminal.com/compare/duffel-vs-travelport.md)
- [FlightClaw vs Odessia](https://www.anchorterminal.com/compare/flightclaw-vs-odessia.md)
- [Kiwi.com MCP Server vs Odessia](https://www.anchorterminal.com/compare/kiwi-mcp-vs-odessia.md)
- [LetsFG vs Odessia](https://www.anchorterminal.com/compare/letsfg-vs-odessia.md)
- [Odessia vs Skyscanner Travel APIs](https://www.anchorterminal.com/compare/odessia-vs-skyscanner.md)
- [Odessia vs Soar](https://www.anchorterminal.com/compare/odessia-vs-soar-travel.md)
- [Odessia vs Travelport TripServices APIs](https://www.anchorterminal.com/compare/odessia-vs-travelport.md)
- [Duffel Flights and Stays API vs Lola](https://www.anchorterminal.com/compare/duffel-vs-lola.md)
- [Duffel Flights and Stays API vs Trainline](https://www.anchorterminal.com/compare/duffel-vs-trainline.md)
- [Lola vs Odessia](https://www.anchorterminal.com/compare/lola-vs-odessia.md)
- [Odessia vs Trainline](https://www.anchorterminal.com/compare/odessia-vs-trainline.md)

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