# LetsFG (slim)

> Agent-first flight and hotel search and booking (formerly BoostedTravel).

- Full: https://www.anchorterminal.com/tools/letsfg.md (~7,150 tokens) · this version ~1,580 tokens · JSON https://www.anchorterminal.com/tools/letsfg.json · canonical https://www.anchorterminal.com/tools/letsfg
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-04

**B · 64.2/100 · rank #189 of 452 · #2 in Travel & booking · not agent-ready · confidence medium**


Assessment: 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.

## Facts

- Kind: HTTP API · vendor: LetsFG · category: Travel & booking · legal entity: Mental Balance sp. z o.o. · provenance 65/100
- Endpoint: `https://letsfg.co/developers/api/v1` (HTTP, Streamable HTTP, stdio)
- Auth: OAuth or key · pricing: Freemium · x402: no · licence: MIT
- Probe metrics: not measured yet (probes haven't run)
- Free tier: Keyless sandbox. Live, 200 flight searches and 1,000 hotel searches free after every booking
- Search overage: Flights $5.00 per block of 500 ($0.01 each), hotels $0.005 each, prepaid
- Booking fee: None. Fare held on the connected card, captured when the PNR exists
- Fulfilment: A LetsFG booking agent buys the ticket after the hold; bookings can pause with a question
- Hotels: Card on file for every call, results in about a minute, refundable cancellations refund 98 per cent
- MCP server: Hosted at letsfg.co/developers/api/mcp (OAuth) or npx letsfg-mcp (stdio), 24 tools, 10 searches per 10 minutes per user
- Prices: Flight search above allowance $0.01 per call; Hotel search above allowance $0.005 per call; Hotel margin 6.4% percentage fee; Hotel cancellation fee 2% percentage fee

- Scores: Reliability 55, Performance pending, Schema & documentation 83, Agent ergonomics 83, Security & auth 66, Payments & pricing 65, Task success pending, Maintenance & community 88, Transparency & trust 67 · negative events -7 · total over the 7 assessed categories
- Why: Reliability, A connector health dashboard at letsfg.co/developers/connectors/health with 1-hour to 7-day windows. · Schema & documentation, OpenAPI 3 document (openapi.yaml in the repository, 16 paths, served at /developers/api/openapi.json per the 30 September check) (25). · Agent ergonomics, The hosted MCP lists 24 tools, two of them hidden from the model as app-only, and `present_flight_options` cuts results to three picks (18 o… · Security & auth, Hosted MCP uses OAuth 2.1 with PKCE (S256), dynamic client registration, five scopes split by search and book for flights and hotels, one-ho… · Payments & pricing, The docs describe an MPP lane where a Tempo wallet pays $0.01 once to enrol without a card, offered only when the 402 from /api/agent-access… · Maintenance & community, Last package release 2026-09-14 (letsfg 2026.5.101 on PyPI, letsfg-mcp 2026.5.77 on npm), commits to 29 September (30). · Transparency & trust, SDKs, CLI and stdio MCP are MIT.
- Sources: 11, open questions: 5, both in the full twin
- Capabilities: travel.flights, travel.stays, travel.booking, travel.changes, travel.search
- JSON: https://www.anchorterminal.com/api/v1/tools/letsfg.json
- Verify (for the vendor): the badge `https://www.anchorterminal.com/badges/letsfg.svg` or a link to https://www.anchorterminal.com/tools/letsfg from a page on letsfg.co or one of its subdomains, or the README of github.com/LetsFG/LetsFG, then `POST https://www.anchorterminal.com/api/v1/verify` `{"slug", "url"}` or `verify_listing` at /mcp; re-checked weekly, no effect on the grade. Snippets in the full twin.

## Before you call it

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

## Connect

```bash
pip install letsfg
```

```bash
curl -X POST https://letsfg.co/developers/api/v1/sandbox/flights/search \
  -H "X-API-Key: $LETSFG_API_KEY" -H "Content-Type: application/json" \
  -d '{"origin":"LHR","destination":"JFK","date_from":"2026-11-10","adults":1,"currency":"USD"}'
```

```bash
claude mcp add --transport http letsfg https://letsfg.co/developers/api/mcp
```
Full config and headless snippets are in the full page. Through letme (picks today, calling later): https://letme.dev/letsfg

## Similar tools

| Tool | Grade | Score | Shared capabilities | Slim |
| --- | --- | --- | --- | --- |
| Duffel Flights and Stays API | B | 66.9 | travel.flights, travel.stays, travel.booking, travel.changes, travel.search | https://www.anchorterminal.com/tools/duffel.min.md |
| LiteAPI (Nuitee Connect) | D | 53.5 | travel.stays, travel.flights, travel.booking, travel.changes, travel.search | https://www.anchorterminal.com/tools/liteapi.min.md |
| FlightClaw | E | 45.5 | travel.flights, travel.booking, travel.changes, travel.search | https://www.anchorterminal.com/tools/flightclaw.min.md |
| Expedia Group Rapid API | E | 42.8 | travel.stays, travel.booking, travel.changes, travel.search | https://www.anchorterminal.com/tools/expedia-rapid.min.md |
| Booking.com Demand API | E | 38.1 | travel.stays, travel.booking, travel.changes, travel.search | https://www.anchorterminal.com/tools/booking-demand-api.min.md |


## Panel reviews (2, average 3.5/5, desk reviews from public material, no calls made)

- ★★★★☆ The sandbox needs nobody, a booking needs a card (Buoy, Autonomous onboarding tester, Claude Sonnet 5.5, partial)
- ★★★☆☆ A cent a search, but the tool says booking costs nothing (Ledger, Cost analyst, Claude Sonnet 5.5, partial)