# Predge Stakes — Signal-Stake Registration on Whale Intelligence Signals

> Predge Stakes — Signal-Stake Registration on Whale Intelligence Signals is a paid API for AI agents from api.predge.io, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Registers a signed signal-stake against a Predge whale-intelligence call, creating an open stake record with an optional rebate cap for Polymarket prediction market insights.

## Facts

- Endpoint: POST https://api.predge.io/v1/stakes
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/predge-stakes-signal-stake-registration-on-whale-intelligence-signals-325e1ab8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sm-Xd3fxbLPqKRJVTwBD1

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability predge-stakes-signal-stake-registration-on-whale-intelligence-signals-325e1ab8 -d '<json body>'
```

Example prompt: On Predge, register a signal stake for buyer 'agent:copybot-7' against the whale call with content hash '9f8e7d6c5b4a39281706f5e4d3c2b1a09f8e7d6c5b4a39281706f5e4d3c2b1a09', and cap the rebate at $0.10.

## When to prefer this

Use this endpoint when you need to register and persist a stake record tied to a specific Predge whale-intelligence signal call, especially when you want Ed25519-signed accountability and optional rebate-cap accounting. Prefer this over read-only signal endpoints when your agent needs to commit to a signal for auditing, copy-trading automation, or rebate tracking purposes.

## Known failure modes

- Invalid or malformed content_hash (not a 64-hex SHA256) returns a 400 error
- buyer ID fails regex validation ([A-Za-z0-9._:@-], 1-200 chars) returns a 400 error
- Content hash does not correspond to an existing open signed call — returns 404 or 422
- rebate_cap_usd below zero or exceeds server-side bound — clamped silently or returns 400
- Payment not included or insufficient (x402 flow) — returns 402 Payment Required
- Duplicate buyer+content_hash combination — idempotent replay returns existing stake record

## How this service works

Real-time alerts on whale traders on Polymarket. Heuristic Insider Watch, wallet scoring 0–100, Bloomberg-style web terminal. Free plan included.

## Output

Returns a JSON object containing a unique stake ID (UUID), the buyer identifier, a signal-stake object with algorithm, canonical payload, and Ed25519 signature, the stake status ('open'), the currency ('USD'), the content hash, the rebate cap in USD, and the stake price ($0.02 USD).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "buyer": {
   "type": "string",
   "description": "Buyer id (1-200 chars, [A-Za-z0-9._:@-]) — idempotency key with content_hash"
  },
  "content_hash": {
   "type": "string",
   "description": "64-hex sha256 of an OPEN signed call's canonical (from POST /v1/calls)"
  },
  "rebate_cap_usd": {
   "type": "number",
   "description": "Optional requested rebate cap (USD); clamped to the server bound"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "id": "0b5e7c1e-0000-4000-8000-000000000000",
  "buyer": "agent:copybot-7",
  "stake": {
   "kind": "signal-stake",
   "algorithm": "ed25519",
   "canonical": "{…}",
   "signature": "…"
  },
  "status": "open",
  "currency": "USD",
  "content_hash": "9f8e7d6c5b4a39281706f5e4d3c2b1a09f8e7d6c5b4a39281706f5e4d3c2b1a09",
  "capital_safety": "Bounded & capital-safe: no funds move automatically. rebate_cap_usd bounds Predge's per-signal exposure; an 'owed' rebate is an accounting entry a human settles out-of-band. Not insurance, not a guaranteed payout.",
  "rebate_cap_usd": 0.1,
  "stake_price_usd": 0.02
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/predge-stakes-signal-stake-registration-on-whale-intelligence-signals-325e1ab8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.predge.io](https://www.zero.xyz/host/api.predge.io/llms.txt)