# Crypto Signal Validator

> Crypto Signal Validator is a paid API for AI agents from agentdata-api.sander-van-aard.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Validates a previously retrieved crypto trading signal by signal_id, returning its live status, entry window, price vs entry zone, spread, and recomputed maker/taker economics.

## Facts

- Endpoint: POST https://agentdata-api.sander-van-aard.workers.dev/crypto/validate
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/crypto-signal-validator-f3a59fa8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CCS3dmsheP24hdDb6cICz

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 crypto-signal-validator-f3a59fa8 -d '<json body>'
```

Example prompt: Can you check if the crypto signal with ID sig_abc123 is still valid right now — is the entry window still open, is the price still in the zone, and have any blockers changed?

## When to prefer this

Use this endpoint when you already have a signal_id from /crypto/scan or /crypto/verdict and need a real-time freshness check before acting — it is cheaper and faster than re-fetching the full signal. Prefer this over /crypto/poll when you need full recomputed economics (not just a version diff), and over /crypto/verdict when you already have the signal and just need live validation rather than a new signal fetch.

## Known failure modes

- Unknown or expired signal_id returns an error or INVALIDATED status
- Network latency from upstream price feeds may cause slightly stale price data
- Payment failure (x402) blocks the request entirely
- Malformed request body results in a 400-level error
- Upstream signal provider outage may cause degraded data quality scores

## How this service works

Is this crypto opportunity still valid right now? Give a signal_id and receive its live status (ACTIVE/STALE/INVALIDATED), remaining entry window in seconds, current price versus the entry zone, spread, data quality, maker/taker economics recomputed at the current price, whether the upstream execution blockers changed, and any invalidation reasons. Freshness first: an expired entry is reported as expired. Advice only: no execution, no custody, no position sizing. Paid per request.

## Output

Returns the signal's live status (ACTIVE, STALE, or INVALIDATED), remaining entry window in seconds, current price versus the entry zone, spread, data quality indicator, recomputed maker/taker economics at the current price, whether upstream execution blockers have changed, and any specific invalidation reasons if the signal is no longer valid.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object"
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/crypto-signal-validator-f3a59fa8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentdata-api.sander-van-aard.workers.dev](https://www.zero.xyz/host/agentdata-api.sander-van-aard.workers.dev/llms.txt)