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Predge Kalshi Market Resolution Attestation
x402
Predge Kalshi Market Resolution Attestation is a paid API for AI agents from api.predge.io, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).
Returns a cryptographically signed Ed25519 attestation of the resolved outcome for a Kalshi prediction market contract by ticker.
Price / call$0.02
Success—
StatusUnknown
How this service works
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Output
A JSON object containing a verified Ed25519 signature over the canonical market resolution, including: the resolution value (yes/no), whether the queried side was correct, the ticker, issuer (predge.io), issued_at and resolved_at timestamps, the raw canonical JSON string that was signed, the hex signature, the public key for offline verification, and a version identifier. The response allows fully offline cryptographic verification of the market outcome.
Example use cases
Smart contract payout verification
“I need a cryptographically signed proof from Predge that the Kalshi market KXBIDENAPP-24 resolved yes — I want to verify it offline before releasing funds.”
Audit trail for prediction market bet
“Can you pull the Predge attestation for Kalshi ticker KXPRESPARTY-28-R on the no side so I can record a tamper-proof resolution result for my compliance log?”
Agent-automated settlement check
“Check whether the Kalshi market KXFEDRATE-0725 resolved correctly for the yes side and give me the signed attestation I can use to verify it independently.”
Technical details
Endpoint
GEThttps://api.predge.io/v1/kalshi/attest/%7Bticker%7DWhen to prefer
Use this endpoint when you need a cryptographically verifiable, offline-checkable attestation of a Kalshi market resolution — not just a raw API response. Ideal for smart contracts, compliance audit trails, trustless settlement flows, or any scenario where you need to prove the outcome without trusting a live API connection at verification time. Prefer this over directly querying Kalshi if you need a signed, portable proof of resolution.
Side effects
- Market not yet resolved — ticker exists but has no resolution yet
- Invalid or unknown ticker — market not found on Kalshi
- Invalid side parameter value — must be 'yes' or 'no'
- Payment failure — x402 payment of $0.02 USDC not provided or rejected
- Network timeout fetching Kalshi resolution data
- Signature verification failure if public key or canonical string is malformed by consumer
Output
Schema · Response
{
"type": "json",
"example": {
"kind": "kalshi-resolution",
"issuer": "predge.io",
"verify": "ed25519: verify `signature` (hex) over the UTF-8 bytes of `canonical` using `public_key` (hex, raw 32-byte ed25519). `canonical` is JSON with keys sorted lexicographically and no whitespace.",
"correct": true,
"payload": {
"kind": "kalshi-resolution",
"issuer": "predge.io",
"source": "kalshi",
"ticker": "KXPRESPARTY-28-R",
"correct": true,
"version": "predge-attest-v1",
"resolved": true,
"issued_at": "2026-07-29T10:00:00.000Z",
"resolution": "yes",
"resolved_at": "2026-07-29T12:45:00Z",
"queried_side": "yes"
},
"version": "predge-attest-v1",
"algorithm": "ed25519",
"canonical": "{\"correct\":true,\"issued_at\":\"2026-07-29T10:00:00.000Z\",\"issuer\":\"predge.io\",\"kind\":\"kalshi-resolution\",\"queried_side\":\"yes\",\"resolution\":\"yes\",\"resolved\":true,\"resolved_at\":\"2026-07-29T12:45:00Z\",\"source\":\"kalshi\",\"ticker\":\"KXPRESPARTY-28-R\",\"version\":\"predge-attest-v1\"}",
"signature": "3a1f…64-byte-hex…9c",
"data_basis": "Settled market resolution from Kalshi's public market API (result yes|no). Outcome-verified truth, not a prediction — signed so a consumer can verify it offline.",
"public_key": "d75a9807...c7e2a1",
"queried_side": "yes",
"outcome_verified": true
}
}Tags
x402
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