Market Not Found

The market with slug \"${slug}\" was not found.

\n \n \n `, 404);\n }\n return c.html(`\n \n Error\n \n

Error

Failed to fetch market information.

\n \n \n `, 500);\n }\n \n const market = await marketResponse.json();\n \n // Format probability as percentage\n const probabilityPercent = (market.probability * 100).toFixed(1);\n \n // Determine status\n const status = market.isResolved \n ? `Resolved: ${market.resolution}` \n : \"Open for trading\";\n \n // Get any query params for debugging\n const queryParams = c.req.url.includes('?') ? c.req.url.split('?')[1] : 'none';\n \n return c.html(`\n \n \n ${market.question}\n \n \n \n

Manifold Market Information

\n \n

Question

${market.question}

\n \n

Current Probability

${probabilityPercent}% chance of YES

\n \n

Market Status

${status}

\n \n

Market Details

Market ID: ${market.id}

Slug: ${market.slug}

Type: ${market.outcomeType}

URL: ${market.url}

\n \n ${market.isResolved ? `\n

Resolution

This market has been resolved as: ${market.resolution}

\n ` : `\n

Trading

This market is currently open for trading.

You can place bets using the API:

Bet YES: /bet/${market.slug}/YES/[amount]
Bet NO: /bet/${market.slug}/NO/[amount]

\n `}\n \n

Data fetched from Manifold Markets API

Query params: ${queryParams}

Timestamp: ${new Date().toISOString()}

\n \n \n `);\n } catch (error) {\n console.error(\"Error fetching market:\", error);\n return c.html(`\n \n Server Error\n \n

Server Error

An internal server error occurred while fetching market information.

\n \n \n `, 500);\n }\n});\n\n// Place a bet via GET request (now returns HTML) - now accepts query params for cache busting\napp.get(\"/bet/:slug/:outcome/:amount\", async (c) => {\n try {\n const slug = c.req.param(\"slug\");\n const outcome = c.req.param(\"outcome\").toUpperCase();\n const amount = parseFloat(c.req.param(\"amount\"));\n \n // Validate inputs\n if (![\"YES\", \"NO\"].includes(outcome)) {\n return c.html(`\n \n Invalid Bet - Bad Outcome\n \n

❌ Bet Failed

Invalid Outcome

Outcome must be YES or NO, you provided: ${c.req.param(\"outcome\")}

← Back to market info

\n \n \n `, 400);\n }\n \n if (isNaN(amount) || amount <= 0) {\n return c.html(`\n \n Invalid Bet - Bad Amount\n \n

❌ Bet Failed

Invalid Amount

Amount must be a positive number, you provided: ${c.req.param(\"amount\")}

← Back to market info

\n \n \n `, 400);\n }\n \n // Get API key from environment\n const apiKey = Deno.env.get(\"MANIFOLD_API_KEY\");\n if (!apiKey) {\n return c.html(`\n \n Configuration Error\n \n

⚙️ Configuration Error

Missing API Key

MANIFOLD_API_KEY environment variable is not set.

Please configure your Manifold API key to place bets.

\n \n \n `, 500);\n }\n \n // First get market details by slug to get the ID\n const marketResponse = await fetch(`https://api.manifold.markets/v0/slug/${slug}`);\n \n if (!marketResponse.ok) {\n if (marketResponse.status === 404) {\n return c.html(`\n \n Market Not Found\n \n

❌ Bet Failed

Market Not Found

The market with slug \"${slug}\" was not found.

Please check the market slug and try again.

\n \n \n `, 404);\n }\n return c.html(`\n \n Market Fetch Error\n \n

❌ Bet Failed

Failed to Fetch Market

Could not retrieve market information for slug: ${slug}

Please try again later.

\n \n \n `, 500);\n }\n \n const market = await marketResponse.json();\n \n // Check if market is resolved\n if (market.isResolved) {\n return c.html(`\n \n Market Already Resolved\n \n

❌ Bet Failed

Market Already Resolved

Question: ${market.question}

Resolution: ${market.resolution}

You cannot bet on a market that has already been resolved.

← View market details

\n \n \n `, 400);\n }\n \n // Check if market is binary\n if (market.outcomeType !== \"BINARY\") {\n return c.html(`\n \n Unsupported Market Type\n \n

❌ Bet Failed

Unsupported Market Type

Question: ${market.question}

Type: ${market.outcomeType}

Only binary (YES/NO) markets are supported by this API.

← View market details

\n \n \n `, 400);\n }\n \n // Place the bet\n const betResponse = await fetch(\"https://api.manifold.markets/v0/bet\", {\n method: \"POST\",\n headers: {\n \"Content-Type\": \"application/json\",\n \"Authorization\": `Key ${apiKey}`\n },\n body: JSON.stringify({\n amount: amount,\n contractId: market.id,\n outcome: outcome\n })\n });\n \n if (!betResponse.ok) {\n const errorText = await betResponse.text();\n console.error(\"Bet API error:\", errorText);\n return c.html(`\n \n Bet Placement Failed\n \n

❌ Bet Failed

Failed to Place Bet

Market: ${market.question}

Attempted Bet: ${amount} mana on ${outcome}

Error: ${errorText}

← Back to market info

\n \n \n `, betResponse.status);\n }\n \n const bet = await betResponse.json();\n \n // Format probabilities as percentages\n const probBeforePercent = (bet.probBefore * 100).toFixed(1);\n const probAfterPercent = (bet.probAfter * 100).toFixed(1);\n \n // Get query params for debugging\n const queryParams = c.req.url.includes('?') ? c.req.url.split('?')[1] : 'none';\n \n return c.html(`\n \n \n Bet Successful!\n \n \n \n

✅ Bet Placed Successfully!

\n \n

Bet Details

Market: ${market.question}

Your Bet: ${bet.amount} mana on ${bet.outcome}

Shares Received: ${bet.shares.toFixed(2)}

\n \n

Market Impact

Probability Before: ${probBeforePercent}%

Probability After: ${probAfterPercent}%

Probability Change: ${(bet.probAfter - bet.probBefore > 0 ? '+' : '')}${((bet.probAfter - bet.probBefore) * 100).toFixed(2)}%

\n \n

Fees

Platform Fee: ${bet.fees.platformFee} mana

Creator Fee: ${bet.fees.creatorFee} mana

Liquidity Fee: ${bet.fees.liquidityFee} mana

Total Fees: ${(bet.fees.platformFee + bet.fees.creatorFee + bet.fees.liquidityFee).toFixed(2)} mana

\n \n

Links

🔗 View market on Manifold

📊 Updated market info

\n \n

Debug Info

Query params: ${queryParams}

Timestamp: ${new Date().toISOString()}

Bet ID: ${bet.id}

\n \n

Cache-busting query parameters are accepted and ignored for functionality

\n \n \n `);\n } catch (error) {\n console.error(\"Error placing bet:\", error);\n return c.html(`\n \n Server Error\n \n

❌ Bet Failed

Internal Server Error

An unexpected error occurred while placing your bet.

Please try again later.

\n \n \n `, 500);\n }\n});\n\n// Health check endpoint\napp.get(\"/\", (c) => {\n return c.html(`\n \n \n Manifold Betting API\n \n \n \n

🎯 Manifold Betting API

Simple API for betting on Manifold markets via URL pings.

\n \n

Endpoints

\n \n

GET

\n /market/{slug}\n

Get market information by slug (JSON format)

Example: /market/will-the-road-to-housing-act-become

Accepts query parameters for cache busting (e.g., ?t=123456)

\n\n

GET

\n /info/{slug}\n

Get market information by slug (HTML format for crawlers)

Example: /info/will-the-road-to-housing-act-become

Accepts query parameters for cache busting (e.g., ?t=123456)

\n \n

GET

\n /bet/{slug}/{outcome}/{amount}\n

Place a bet on a market (returns HTML confirmation)

Parameters:

slug - Market slug (from URL)
outcome - YES or NO
amount - Amount in mana to bet

Example: /bet/will-the-road-to-housing-act-become/YES/10

Accepts query parameters for cache busting (e.g., ?t=123456)

\n\n

🧪 Test the API

\n \n \n \n

\n \n \n \n \n

\n \n

Setup

Set the MANIFOLD_API_KEY environment variable with your Manifold API key.

Get your API key from your Manifold profile page.

\n \n

Cache Busting

All endpoints now accept query parameters (like ?t=123456) for cache busting.

These parameters are ignored functionally but help bypass external caches.

\n\n \n \n \n `);\n});\n\n// Catch-all for 404s\napp.all(\"*\", (c) => {\n return c.json({ error: \"Not found\" }, 404);\n});\n\nexport default app.fetch;","deleted","label",[170,151],"backend","permalink","https://www.val.town/x/dcm31/manifold-betting-template-2/code/backend/index.ts","extension","actionData","errors"]