Open Ephemeris vs BoostedTravel
A side-by-side look at the Open Ephemeris and BoostedTravel MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Open Ephemeris for aerospace & astrodynamics work as a local process; choose BoostedTravel for travel & transportation as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Open Ephemeris when
- You need dedicated capabilities in the Aerospace & Astrodynamics domain.
- You prefer a local stdio subprocess transport.
- You have the keys it needs:
OPENEPHEMERIS_PROFILE, OPENEPHEMERIS_BACKEND_URL, OPENEPHEMERIS_API_KEY. - You want tools like
explore_natal_chart, explore_human_design, explore_human_design_transit.
Choose BoostedTravel when
- You need dedicated capabilities in the Travel & Transportation domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: API key required.
- You have the keys it needs:
LETSFG_BEARER_TOKEN, LETSFG_API_KEY. - You want tools like
search_flights, resolve_location, unlock_flight_offer.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Aerospace & Astrodynamics | Travel & Transportation |
| Quality signal | 64/100 · Good | 72/100 · Great |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | Not declared | API key required |
| Pricing | Not declared | Free |
| Required env vars | OPENEPHEMERIS_PROFILEOPENEPHEMERIS_BACKEND_URLOPENEPHEMERIS_API_KEY | LETSFG_BEARER_TOKENLETSFG_API_KEY |
| Verified owner | Community listing | Community listing |
| GitHub stars | 5 | 2,183 |
| Directory activity | 2 views 0 installs 0 upvotes | 8 views 1 installs 0 upvotes |
| Tools | 39 | 14 |
| Full listing | View Open Ephemeris | View BoostedTravel |
Tools & capabilities
Open Ephemeris tools 39
explore_natal_chartUse this when the user asks 'show me my birth chart', 'what's my rising sign', 'my big 3', 'what's my sun, moon and rising', 'what sign is my Moon / Venus / Mars in', 'what does my chart say about my career / love', 'read my chart', or shares birth details and wants to explore them — any natal / birth-chart / astrology-chart request. Returns an interactive chart wheel rendered inline (Claude and ChatGPT; text summary elsewhere) where any planet, house or aspect line can be clicked for interpretation, with switchable house systems. The birthplace can be given as `location` (a place name — resolved server-side) or as coordinates, together with the birth date and local time and its zone. CREDIT COST: 1 credit per call (+1 to resolve a place name).explore_human_designUse this when the user asks 'what's my Human Design', 'am I a Generator / Projector / Manifestor / Reflector', 'show my bodygraph', 'what's my HD type and profile', 'what's my strategy and authority' or 'what's my incarnation cross'. Returns an interactive bodygraph (inline in Claude and ChatGPT; text summary elsewhere) showing defined/undefined centers, active gates, channels, Type, Profile, Authority and Incarnation Cross, with any center or gate clickable for interpretation. Birthplace may be a place name (`location`). CREDIT COST: 4 credits per call (2 chart + 2 render; +1 to resolve a place name). Human Design was originated by Ra Uru Hu; OpenEphemeris is an independent calculation service, not affiliated with Jovian Archive.explore_human_design_transitUse this when the user asks 'what are today's Human Design transits for me', 'what gates are being activated for me right now', 'which channels does this transit complete in my chart' or 'how is the current sky affecting my bodygraph'. Returns an interactive overlay bodygraph (inline in Claude and ChatGPT; text summary elsewhere) highlighting the channels the transit temporarily COMPLETES with the natal chart and any centers it newly defines, for now or a chosen datetime. Birthplace may be a place name (`location`). CREDIT COST: 5 credits per call (chart 3 + render 2; +1 per place name). Human Design was originated by Ra Uru Hu; OpenEphemeris is an independent calculation service, not affiliated with Jovian Archive.explore_human_design_connectionUse this when the user asks 'are we compatible in Human Design', 'what's our connection chart', 'what channels do we make together' or 'show our composite bodygraph' — two people's HD charts overlaid. Returns an interactive two-person overlay bodygraph (inline in Claude and ChatGPT; text summary elsewhere) with every connected channel classified by HD connection theory: electromagnetic (attraction), companionship (sameness), dominance (one defines), compromise (friction). CREDIT COST: 5 credits per call (composite 3 + render 2). Human Design was originated by Ra Uru Hu; OpenEphemeris is an independent calculation service, not affiliated with Jovian Archive.explore_bi_wheelUse this when the user asks 'are we compatible', 'compare my chart with my partner's', 'what's my horoscope for today', 'what's hitting my chart right now', 'what's my solar return chart this year' or 'my progressed chart on my birth chart' — any two-ring comparison they should SEE. Returns an interactive bi-wheel (inline in Claude and ChatGPT; text summary elsewhere): inner wheel Person 1's natal chart, outer ring by mode — synastry (Person 2's natal; needs their birthplace), transit (a date; today for a daily horoscope), progressed, solar_arc (target date), solar_return (target year), lunar_return (target month) — with cross-aspects drawn and every planet, aspect line and cusp clickable. Birthplaces may be place names (`location`, `person2_location`). CREDIT COST: 2 credits per call for most modes (1 per wheel; +1 to resolve a place name); solar_return/lunar_return modes cost 6.explore_moon_phaseUse this when the user asks 'what's the moon phase tonight', 'is tonight a full moon', 'show me the moon right now', 'what sign is the Moon in', 'is the Moon void of course' — or has no birth data and wants somewhere to start; it needs no arguments. Returns an interactive Moon dial (inline in Claude and ChatGPT; text summary elsewhere) with: • SVG crescent Moon showing real-time illumination percentage • Phase name and waxing/waning indicator • Current Moon sign with degree • Void-of-Course status with timing details • Lunar age (days in the synodic cycle) and days to the next New and Full Moon • The tightest applying lunar aspects CREDIT COST: 3 credits per call (phase + void-of-course + aspects, 1 each).explore_transit_timelineUse this when the user asks 'what transits are coming up for me', 'what's my forecast for the next year', 'when will Saturn hit my chart', 'show my upcoming transits' or 'what's happening astrologically for me in 2027' — a forecast they should SEE. Returns an interactive, date-ordered timeline (inline in Claude and ChatGPT; text summary elsewhere) of exact transit hits grouped by month — transiting planet glyph, the natal point it contacts, the aspect, zodiac position and retrograde markers — each clickable for a focused interpretation. Every hit carries its in-orb window (when the transit starts and ends, and which pass it is when a retrograde repeats it), and transits already in orb at the start are listed with applying/separating. ASPECT ANGLES: 0 = conjunction/return (default), 180 = opposition, 90 = square, 120 = trine, 60 = sextile. EFFICIENCY: searches run faster when transiting_planets and natal_points are given. MAX SPAN: Explorer/PayG 1y, Pro 5y, Startup 10y, Scale 40y (longer = 400). CREDIT COST: 1 + span price: ≤1y 5 (6 total), ≤3y 10, ≤5y 15, ≤10y 25, ≤20y 40, ≤40y 70.explore_vedic_chartUse this when the user asks 'show my Vedic chart', 'my Jyotish chart', 'what's my nakshatra', 'my sidereal birth chart', 'my rashi chart' or 'what's my lagna'. Returns an interactive South Indian fixed-sign Rashi grid (inline in Claude and ChatGPT; text summary elsewhere) with sidereal (Lahiri by default) placements, nakshatra with pada, navamsa and the Lagna (Ascendant) rashi; click any rashi cell for its themes and the planets placed there. Birthplace may be a place name (`location`). CREDIT COST: 3 credits per call (chart + render; +1 to resolve a place name).bazi_annual_pillarUse this when the user asks 'what element is the year of the Snake', 'what's the pillar, stem and branch or NaYin for my birth year' or 'what's the energy of this year' — a single-year lookup beyond the animal. Returns the year's Heavenly Stem, Earthly Branch, Chinese characters, zodiac animal, element, polarity and NaYin (纳音) resonance image for any Gregorian year 1-9999. CREDIT COST: 3 credits per call.explore_bazi_chartUse this when the user asks 'what's my BaZi', 'my Four Pillars', 'what's my Day Master', 'my Chinese astrology chart', 'what's my Chinese element' or 'my Chinese birth chart'. Returns an interactive Four Pillars (四柱命盘) explorer (inline in Claude and ChatGPT; text summary elsewhere): the Year, Month, Day and Hour pillars — each with Heavenly Stem (天干), Earthly Branch (地支), Ten God label and element color — plus the Day Master identity and a Wu Xing (五行) element balance bar; click any pillar for what it reveals about that life domain. CREDIT COST: 3 credits per call (1 base + 2 visual render).auth_loginUse this when the user asks to 'connect', 'sign in', 'log in' or 'link my OpenEphemeris account'. Returns a verification URL and code for the user to enter in their browser; the server then receives credentials automatically and every call is billed to that account (tier, credits, rate limits).auth_statusUse this when the user asks 'am I logged in', 'which account is this connected to', 'how am I authenticated' or 'when does my token expire'. Returns whether the server is authenticated, the linked account, the method (API key, JWT, device auth) and token expiry.- +27 more on the listing page
BoostedTravel tools 14
search_flightsSearch hundreds of airlines for live flight prices — completely FREE, unlimited, read-only. Returns structured offers with prices, airlines, times, durations, and stopovers. Some offers carry `starlink` for in-flight Starlink Wi-Fi: "confirmed_all" / "confirmed_some" mean the carrier has FULLY fitted that aircraft type, "likely_all" / "likely_some" mean the rollout on that type is underway but incomplete. State only "confirmed_*" as fact; describe "likely_*" as "the airline is fitting this aircraft type, not guaranteed on your flight". Anything ending in "_some" has at least one leg WITHOUT it. An absent field means no information, NOT an absence of Wi-Fi. Covers airlines across all continents including low-cost carriers. Search is async: this tool polls for you, including waiting out the late split-ticket merge. Some offers are SPLIT TICKETS: two separately-issued tickets through a hub, each leg booked from whatever is cheapest for it (usually two different airlines), because no one seller offers the combination as a single ticket. They carry `split_ticket: "true"`, `combo_type: "virtual_interlining"` and `self_transfer: "unprotected"`. ALWAYS tell the user when an offer is a split ticket and what unprotected means: the tickets are not linked, so if the first flight is late and the connection is missed, the second airline owes nothing — no rebooking, no refund. Never present a split ticket as though it were one through-fare. Requires LETSFG_BEARER_TOKEN or LETSFG_API_KEY. See letsfg://guide resource for the full authenticate->search->book workflow.resolve_locationConvert a city/airport name to IATA codes. Always call before search_flights if you only have a city name. Read-only, safe to call multiple times.unlock_flight_offer[Developer API only] Confirm live price with the airline and reserve the offer for 30 minutes. NOT part of the agent flow and NOT needed before book_flight. It requires LETSFG_API_KEY (the paid, prepaid Developer API) and refuses to run on a Bearer token, because the PFS unlock endpoint does not exist — calling it that way used to 404. If you authenticated with `letsfg auth`, go straight from search_flights to book_flight. Requires a Developer API key. Legacy path — not idempotent.book_flightBook a flight from a search result. FLOW: authenticate (once) -> search_flights -> book_flight CHARGES: nothing from LetsFG. A completed booking pays the airline prices from airlines and the major booking sites. RESULT: either {"booked": true, "order_id": "..."} or {"booked": false, "booking_url": "..."} — the second means the booking genuinely did not complete and nothing was charged. That is a normal outcome, NOT a transient error: do not retry, give the user the booking_url. SAFETY: use REAL passenger details — names must match passport, email receives the e-ticket.get_flight_bookingPoll a flight booking started by book_flight. REQUIRED to learn the outcome: on a PFS Bearer token book_flight returns a booking_ref and state "booking_in_progress", not a PNR - the booking itself takes 4-11 minutes. Call it every 20-30 s with that booking_ref until state is terminal: completed -> PNR issued, card charged failed -> the hold was released, nothing was charged needs_attention -> a human is looking at it; do NOT rebook Do not rebook while the state is still moving, and do not treat a slow poll as a failure - the money is HELD, not taken, until the airline confirms. Refs last one hour past the booking start.resolve_hotel_cityConvert a place name to the supplier city id that search_hotels needs. Always call this first if you only have a city name. Read-only and safe to repeat. Use `Id` from the first result as city_id and `Name` as city_name.search_hotelsSearch real, bookable hotel inventory. Requires a payment method on file — the SAME card that authorises flight booking. That applies to search too, not just booking, because a search opens a real session at the supplier. Only free-cancellation, pay-later rates are returned, so everything you see can actually be booked on these terms. The result set is smaller than a metasearch and that is deliberate. `price` is what the guest pays. Keep `session_id` and the chosen offer's `combination_id_v2` — together they identify that exact rate, and book_hotel needs both. Takes up to a few minutes.book_hotelBook one hotel rate. Charges 5% of the price to the card on file immediately as a NON-REFUNDABLE reservation fee; the balance is paid directly to the supplier through the pay link we return, by balance_due_by (the supplier's own auto-cancellation date). Returns a booking_job_id, NOT the booking — a booking takes minutes. Poll get_hotel_booking until status is succeeded or failed. The fee is charged BEFORE the room is committed, so a declined card costs nothing: no reservation exists and nothing is charged. Send expected_price and expected_balance back exactly as search returned them. NOT idempotent — calling twice for the same rate books the room twice and charges two fees.get_hotel_bookingCollect the result of a booking started with book_hotel. Poll every ~20s. status is in_progress, succeeded or failed. On success you get confirmation, reservation_fee_charged, pay_link, balance_due, balance_due_by and the full cancellation ladder. Read-only and safe to repeat.cancel_hotel_bookingRelease a hotel reservation. Free until balance_due_by; after that the hotel's own ladder applies and can reach 100%. The ladder is in the booking terms, so check the cost first. The 5% reservation fee is NOT refunded. Takes over a minute; if it times out do NOT assume it failed — re-check before retrying.authenticateExplain how to connect a card so this server can search and book. Nothing is charged to connect — a 0.00 Revolut setup that saves the card so a booking can be charged later. Call with no arguments. It returns the current instructions and add_card_url (https://letsfg.co/connect). A PERSON must approve once in a browser — there is no endpoint that mints a token from card details, so do not ask the user for card numbers and do not try to automate this step. Two ways in: (a) add LetsFG as a connector in an assistant that supports remote MCP servers and approve it, or (b) any OAuth-capable client can register itself — see https://letsfg.co/for-agents, section "Option B". Both land on the same card screen. RETIRED 2026-09-02: the Stripe lanes (setup_url, setup_session_id, payment_method_id, card_token) and every token they issued. Passing them now fails. This does NOT create a Developer API billing account. Do not use setup_payment for this.setup_payment[Developer API only — you almost certainly want `authenticate` instead] Attaches a card to a PAID prepaid Developer API account. Refuses to run unless LETSFG_API_KEY is set, because agents kept calling this and creating billing accounts they did not need.- +2 more on the listing page
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
Open Ephemeris
{
"mcpServers": {
"open-ephemeris": {
"command": "npx",
"args": [
"-y",
"@openephemeris/mcp-server"
],
"env": {
"OPENEPHEMERIS_PROFILE": "YOUR_OPENEPHEMERIS_PROFILE_HERE",
"OPENEPHEMERIS_BACKEND_URL": "YOUR_OPENEPHEMERIS_BACKEND_URL_HERE",
"OPENEPHEMERIS_API_KEY": "YOUR_OPENEPHEMERIS_API_KEY_HERE"
}
}
}
}
BoostedTravel
{
"mcpServers": {
"boostedtravel": {
"command": "npx",
"args": [
"-y",
"letsfg-mcp"
],
"env": {
"LETSFG_BEARER_TOKEN": "YOUR_LETSFG_BEARER_TOKEN_HERE",
"LETSFG_API_KEY": "YOUR_LETSFG_API_KEY_HERE"
}
}
}
}
Frequently asked questions
Open Ephemeris is categorized under Aerospace & Astrodynamics and uses a local stdio subprocess. BoostedTravel belongs to Travel & Transportation and uses a local stdio subprocess. Pick Open Ephemeris for aerospace & astrodynamics work and BoostedTravel for travel & transportation.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client.
Open Ephemeris has no declared pricing — check the project's own site. BoostedTravel is listed as free. Auth: api key required. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add open-ephemeris and boostedtravel as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Open Ephemeris has a quality signal of 64/100 (Good) with 2 views, 0 installs and 5 GitHub stars. BoostedTravel has 72/100 (Great) with 8 views, 1 installs and 2,183 GitHub stars.