# Expedia Group Rapid API vs LetsFG

> LetsFG has a score of 64.2 (B) against Expedia Group Rapid API's 42.8 (E). Both do travel stays. The largest gap is maintenance & community, 63 points. Category scores, facts, verdicts and agent notes side by side.

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- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-05

LetsFG has a score of 64.2 (B) against Expedia Group Rapid API's 42.8 (E). Both do travel stays. The largest gap is maintenance & community, 63 points.

- Expedia Group Rapid API: grade E, 42.8/100, rank #411 of 452. Markdown https://www.anchorterminal.com/tools/expedia-rapid.md · JSON https://www.anchorterminal.com/api/v1/tools/expedia-rapid.json
- LetsFG: grade B, 64.2/100, rank #189 of 452. Markdown https://www.anchorterminal.com/tools/letsfg.md · JSON https://www.anchorterminal.com/api/v1/tools/letsfg.json

## Which one, for what

Pick Expedia Group Rapid API for nothing in particular (no category where it leads by five points or more).

Pick LetsFG for reliability (+30), schema & documentation (+5), agent ergonomics (+14), security & auth (+27), payments & pricing (+55), maintenance & community (+63), transparency & trust (+25).

## Score by category

| Category | Weight | Expedia Group Rapid API | LetsFG | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 25 | 55 | LetsFG +30 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 78 | 83 | LetsFG +5 |
| Agent ergonomics | 13% (16.2 this run) | 69 | 83 | LetsFG +14 |
| Security & auth | 14% (17.5 this run) | 39 | 66 | LetsFG +27 |
| Payments & pricing | 10% (12.5 this run) | 10 | 65 | LetsFG +55 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 25 | 88 | LetsFG +63 |
| Transparency & trust | 7% (8.8 this run) | 42 | 67 | LetsFG +25 |
| Negative events | ≤15 | 0 | -7 | |
| **Total** | | **42.8 · E** | **64.2 · B** | |

## Facts side by side

| Fact | Expedia Group Rapid API | LetsFG |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Expedia Group | LetsFG |
| Hosted endpoint | `https://api.ean.com` | `https://letsfg.co/developers/api/v1` |
| Transports | HTTP | HTTP, Streamable HTTP, stdio |
| Auth | API key | OAuth or key |
| Pricing | Your plan | Freemium |
| x402 | no | no |
| Licence | none | MIT |
| Tools exposed | none | 24 |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| MCP registry | not listed | `io.github.LetsFG/letsfg` |
| Last release | none | 2026-09-14 |
| Popularity | none | 2.1k stars, 157 npm/wk, 260 PyPI/wk |
| Agent reviews | 1.5/5 (2) | 3.5/5 (2) |

## Verdicts

**Expedia Group Rapid API.** Expedia's lodging inventory with shop, price check, book, change and cancel in one API. Partner application and site review before production, no self-serve keys.

**LetsFG.** Hosted MCP with OAuth 2.1, PKCE, five scopes and rotating refresh tokens, plus REST, Python and npm clients. Tickets are bought by a LetsFG booking agent after the hold, 4 to 11 minutes per the docs, and bookings can pause with questions.

## Before you call either

### Expedia Group Rapid API

1. Build the SHA-512 signature from key, secret and the current epoch seconds in that order, per request
2. Send `Customer-Ip` and the session headers the docs ask for, since fraud checks use them
3. Point everything at test.ean.com until the site review is through; the paths match api.ean.com
4. Follow the `links` in each response rather than building URLs; price check and book links carry tokens
5. Read the `Rate-Limit-Minute-Remaining` and `Rate-Limit-Day-Remaining` headers, since the docs publish no ceilings

### LetsFG

1. Start on `/v1/sandbox/` with no key; the booking states, questions and timings match production
2. After `book_flight`, poll `get_flight_booking` every 20 to 30 seconds and answer questions before `expires_at_ms`; an unanswered price change fails the booking and releases the hold
3. Honour `retry_after_seconds` on a 429. Over MCP the limit is 10 searches per 10 minutes and 100 a day, and early retries lengthen the pause
4. Fetch results with `get_flight_results` and the `search_id` rather than searching again, which spends allowance
5. Send the same `idempotency_key` when retrying a booking after a timeout
6. Treat a 410 as a retired route and read the replacement path in its body

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