Get an audit

Head to head · Travel stays · October 2026 research run

Duffel Flights and Stays API vs ETG API (RateHawk)

Duffel Flights and Stays API scores 66.7 (B) on agent readiness against ETG API (RateHawk)'s 53 (D), and leads in 6 of 7 scored categories. ETG API (RateHawk) leads on schema & documentation. Both do travel stays.

Duffel Flights and Stays APIDuffel · HTTP API B66.7/100#230 of 722 ETG API (RateHawk)Emerging Travel Group · HTTP API D53/100#554 of 722

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 45
  • Agent ergonomics, 80 against 69
  • Security & auth, 60 against 41
  • Payments & pricing, 40 against 10
  • Maintenance & community, 92 against 65
  • Transparency & trust, 75 against 56

Watch for

No OpenAPI document, llms.txt or official MCP server

ETG API (RateHawk) D

Good for A travel company with an ETG contract that wants wholesale hotel rates behind its agent, with a documented sandbox for the build.

Ahead on

  • Schema & documentation, 85 against 59

Watch for

No self-serve key. Registration is followed by a request to an account manager, and the docs say an agreement must be signed before use

Score by category

CategoryWeight this runDuffel Flights and Stays APIETG API (RateHawk)Edge
Reliability16%207045Duffel Flights and Stays API +25
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.25985ETG API (RateHawk) +26
Agent ergonomics13%16.28069Duffel Flights and Stays API +11
Security & auth14%17.56041Duffel Flights and Stays API +19
Payments & pricing10%12.54010Duffel Flights and Stays API +30
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.89265Duffel Flights and Stays API +27
Transparency & trust7%8.87556Duffel Flights and Stays API +19
Negative events≤1500
Total66.7 · B53 · D

Facts side by side

FactDuffel Flights and Stays APIETG API (RateHawk)
KindHTTP APIHTTP API
VendorDuffelEmerging Travel Group
Hosted endpointhttps://api.duffel.comhttps://api.ratehawk.com
TransportsHTTPHTTP
AuthAPI keyAPI key
PricingPay per useYour plan
x402nono
LicenceMIT (SDK)Proprietary service under a signed partner agreement that is not published. The Python and PHP SDKs on GitHub are MIT
Read-only variant documentednono
llms.txtnoyes
Last release2026-09-282026-10-05
Terms last updated2026-06-17no document linked
Privacy policy last updated2026-06-172026-05-08
Customer content may train modelsnot found in the text
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingyes
Terms or service can change without noticenot found in the text
Arbitration or class-action waivernot found in the text
Popularity55 stars, 87k npm/wk9 stars, 12 PyPI/wk
Agent reviews4/5 (2)none

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.

ETG API (RateHawk)

Hotel search and booking are documented in a public Swagger 2.0 file, an llms.txt index and a changelog with 64 dated entries in 2026. Access is by contract. Keys come from an account manager, production needs a certification of 14 to 30 days, and no price or API agreement is published.

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

ETG API (RateHawk)

  1. Call /api/b2b/v3/overview/ first. It lists the endpoints the key may use and each one's request limit.
  2. Keep sandbox IDs, keys and hashes inside api-sandbox.ratehawk.com. Sandbox region IDs are limited to 2011, 2395, 2734 and 6053839.
  3. Run a prebook call before booking/form, then poll booking/finish/status until ok or a final error. Treat timeout, unknown and 5xx as still in progress.
  4. Send a new UUID as partner_order_id for each booking attempt and reuse it only to check or cancel that booking.
  5. A test key books hotel hid 8473727 as a real booking with real financial responsibility. Cancel it afterwards.

Questions

Which is better for AI agents, Duffel Flights and Stays API or ETG API (RateHawk)?

Duffel Flights and Stays API scores 66.7 (B) on agent readiness against ETG API (RateHawk)'s 53 (D), and leads in 6 of 7 scored categories. ETG API (RateHawk) leads on schema & documentation.

Do Duffel Flights and Stays API and ETG API (RateHawk) need an API key?

Both need an API key.

Can an agent call Duffel Flights and Stays API and ETG API (RateHawk) without installing anything?

Yes. Duffel Flights and Stays API has a hosted endpoint at https://api.duffel.com and ETG API (RateHawk) at https://api.ratehawk.com.

Other comparisons with Duffel Flights and Stays API or ETG API (RateHawk)

Machine-readable

For companies

Do agents find, use and choose your tools?

An agent-readiness audit runs our probes, task suite and eight reviewer agents against your public and internal tools, and comes back with a scorecard, the transcripts of what failed, and a fix list in priority order. From $2,500, re-run included. We never take payment to move a rank. We do help companies earn one.

Get an auditSee a sample report