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Predge Signed Prediction Commit
x402
Predge Signed Prediction Commit is a paid API for AI agents from x402-api-production-266e.up.railway.app, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-14).
Commits a tamper-evident, ed25519-signed yes/no prediction on an open Polymarket market, chain-linked and content-addressed for cryptographic integrity.
Price / call$0.1
Success—
StatusUnknown
How this service works
Commit a SIGNED live call: an ed25519-signed prediction (yes/no) on an OPEN Polymarket market, chain-linked (prev_hash) and content-addressed (sha256). Refuses resolved/closed markets — the signature must precede the outcome. Tamper-evident by construction; verify free at GET /verify. Body: {condition_id, side: yes|no, size_usd?, note?}.
Output
Returns a signed prediction envelope containing the ed25519 signature, sha256 content address, chain-linking prev_hash, the submitted condition_id, side, optional size and note, and a verification reference URL. The record is immutable and can be verified for free at GET /verify.
Example use cases
Forecaster accountability record
“I want to go on record predicting YES for Polymarket condition 0xdef456... before it closes — commit a signed call for me with a $100 stake and note 'based on latest polling data'.”
Anonymous verifiable market stance
“Submit a signed NO prediction on Polymarket market 0x789abc... right now — no stake amount, but add a note saying 'macro headwinds make this unlikely'.”
Timestamped prediction before resolution
“Lock in my signed YES call on Polymarket condition 0x112233... for $25 so I can prove I made this prediction before the market resolves.”
Technical details
Endpoint
POSThttps://x402-api-production-266e.up.railway.app/v1/callsWhen to prefer
Choose this endpoint when you need a cryptographically verifiable, tamper-evident record that a prediction was made BEFORE a Polymarket market resolves — not just for storing data, but for producing a chain-linked, ed25519-signed attestation that can be independently verified. Prefer this over generic logging when accountability, non-repudiation, and timestamped forecasting credibility matter.
Side effects
- Market already resolved or closed — endpoint refuses and returns an error indicating the market is not open
- Invalid or unknown condition_id — returns error if the Polymarket market cannot be found
- Malformed side value — must be exactly 'yes' or 'no'
- size_usd with more than 2 decimal places — rejected as it must be a fixed 2-decimal string
- Payment failure — x402 payment of $0.1 USDC not received or invalid
- Note exceeding 500 characters — rejected with validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| note | string | Optional free-text note (<=500 chars, signed) |
| side | string | "yes" or "no" |
| size_usd | number | Optional stake to record (signed as fixed 2-dp string) |
| condition_id | string | Polymarket condition id of an OPEN market |
Tags
x402
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