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Poseidon in VS Code
Four steps: a free key, one paste, one question. Your AI then looks up Meta's winning ads for you.
1 Get your free key
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2 Copy this into VS Code
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Create .vscode/mcp.json in your project
{ "inputs": [ { "type": "promptString", "id": "poseidon-key", "description": "Poseidon API key (psd_...)", "password": true } ], "servers": { "poseidon": { "type": "http", "url": "https://api.askposeidon.app/mcp", "headers": { "Authorization": "Bearer ${input:poseidon-key}" } } } }VS Code asks for your key the first time and keeps it in its secret store, so the key never sits in the file.
Start it
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"poseidon"in the file and paste your key. Then open Copilot Chat in Agent mode: Poseidon's tools are under the tools button.
3 Ask this first question
What are the winning video ads for weight loss in France? Go look in Poseidon.4 See a real answer
Asked in Claude Code on 13 November 2026, with this exact question. Your AI's wording will differ; the ads and the numbers come from the same data. Shops are shown by their domain.
Poseidon has 230 French weight-loss video ads live for 21+ days (its "winner" rule), read on 12–13 Nov 2026. Only 11 of them have a transcribed script.
Poseidon tags ads by the search keyword that found the brand, so several results aren't really weight loss (a creatine brand, a dog-itching brand, a jeweller, a skincare brand). I've left those out. The real weight-loss winners are below. Reach is Meta's EU total, mostly France.
| Brand / product | Hook (verbatim) | Days live | EU reach |
|---|---|---|---|
| epycure.com "Boost Métabolisme" (862034243491035) | « J'ai perdu 10 kilos en 3 mois, comment t'expliques que ça marche aussi bien ? » | 249 | 2.77M |
| epycure.com, same hook (953770740499393) | same | 226 | 984K |
| epycure.com (1810945286549226) | « J'ai perdu 10 kilos en 3 mois, je note toutes les méthodes que j'ai testées. » | 156 | 1.22M |
| epycure.com "Duo Métabolisme Cortisol" (1548772947043511) | Cortisol belly: « …pourquoi mes jeans ne fermaient plus. J'étais stressée… tout se stockait sur mon ventre » | 168 | 804K |
| bonjourdrink.co (vitamins) (1606210810859473) | « La première chose que j'ai arrêté de boire le matin, c'est l'eau citronnée pour perdre du poids. » | 77 | 3.13M |
| bonjourdrink.co (1029580753185733) | Myth-busting: « Trois mythes que je démonte… en 15 secondes » | 97 | 2.0M |
| bonjourdrink.co (vitamins + digestion pages) (3995448180749188, 1369202271811705) | « Le ventre gonflé, le coup de barre à 14h et l'irritabilité… c'est le même organe qui déraille. » | ~120 | ~1.97M each |
bonjourdrink.co runs about 6 more videos with 0.9–1.9M reach that have no transcript yet, so I can't tell you what they say.
What works in France right now:
- epycure.com: a first-person result with a number ("10 kilos en 3 mois") plus a metabolism or cortisol mechanism, kept running for 150–250 days.
- bonjourdrink.co: a "stop doing X" hook that calls out a common belief (lemon water) or myths, and a single cause behind several symptoms (bloating, energy crash, irritability). These are newer but reach the most people.
If something's off
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