Event Resolver API

Event Resolver API

Resolve prediction market events with confidence scores. Aggregates news, price feeds, and web data to determine if real-world events occurred. Settlement oracle for binary, numeric, and categorical outcomes. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

{

"mcpServers": { "event-resolver": { "url": "https://event-resolver.api.klymax402.com/mcp" } } }

Quickstart -- HTTP (x402)

curl -X POST "https://event-resolver.api.klymax402.com/api/resolve" \

-H "Content-Type: application/json" \ -d '{"question":"..."}'

-> 402 Payment Required, with an x402 payment challenge in the response body

Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.

Tools

event_resolve_outcome

Use this when you need to determine the outcome of a real-world event for prediction market settlement. Takes a natural language question (e.g. "Did BTC reach $100K?", "Did France win the 2026 World Cup?") and returns a structured resolution with confidence score.

Parameters

Returns

• question -- the original question being resolved
• resolved -- whether the event can be conclusively determined (true/false)
• outcome -- the determined result -- "Yes"/"No" for binary, a number for numeric, or a category string
• confidence -- 0-100 score indicating certainty of the resolution
• sources -- array of data sources consulted, each with name, url, and whether it agrees with the outcome
• timestamp -- ISO timestamp of when the resolution was performed

Example response:

{ "question": "Did BTC reach $100K?", "resolved": true, "outcome": "Yes", "confidence": 95, "sources": [{ "name": "CoinGecko", "url": "https://coingecko.com", "agrees": true }], "timestamp": "2026-04-13T12:00:00Z" }

Not for: prediction market odds (use prediction_list_markets), crypto prices only (use token_get_price), full fact checking with sources (use research_check_fact), trust/security scoring (use trust_score_evaluate).

event_verify_claim

Use this when you need to quickly verify whether a factual claim is true or false. Simpler and cheaper than full event resolution -- designed for fast claim checking without structured market settlement.

Parameters

Returns

• claim -- the original claim being verified
• verdict -- "true", "false", or "unverifiable" if insufficient data
• confidence -- 0-100 score indicating certainty of the verdict
• evidence -- array of strings summarizing supporting or contradicting evidence found

Example response:

{ "claim": "Tesla stock is above $300", "verdict": "true", "confidence": 90, "evidence": ["CoinGecko/financial APIs confirm current price above threshold", "Multiple news sources corroborate"] }

Not for: prediction market odds (use prediction_list_markets), full fact checking with sources (use research_check_fact), stock prices (use stock_get_quote), crypto prices only (use token_get_price).

event_check_price_threshold

Use this when you need to check if a cryptocurrency or stock price has crossed a specific threshold -- the most common resolution type in prediction markets. Returns current price, whether threshold was crossed, and direction.

Parameters

Returns

• asset -- the asset being checked (e.g. "bitcoin", "ethereum", "solana")
• currentPrice -- the current price in USD from CoinGecko
• threshold -- the target price threshold
• direction -- "above" or "below" -- which direction constitutes crossing
• crossed -- boolean indicating whether the price has crossed the threshold in the specified direction

Example response:

{ "asset": "bitcoin", "currentPrice": 102450.23, "threshold": 100000, "direction": "above", "crossed": true }

Not for: crypto prices only (use token_get_price), prediction market odds (use prediction_list_markets), stock prices (use stock_get_quote), trust/security scoring (use trust_score_evaluate).

Example agent prompts

• "Determine the outcome of a real-world event for prediction market settlement"
• "Quickly verify whether a factual claim is true or false"
• "Check if a cryptocurrency or stock price has crossed a specific threshold -- the most common resolution type in prediction markets"

Payment

• Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
• Network: Base L2 (eip155:8453)
• Asset: USDC
• Facilitator: Coinbase CDP (primary), PayAI (fallback)
• Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)

Part of klymax402

100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.

• Catalog: https://klymax402.com/llms.txt
• Full API reference: https://klymax402.com/llms-full.txt
• Live stats: https://klymax402.com/stats

License

MIT