# draconic21 Daily Agent Signal - Signal History

> draconic21 Daily Agent Signal - Signal History is a paid API for AI agents from draconic21-x402-api.onrender.com, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-11).

Retrieves historical daily agent signal data for up to 30 days, priced at $0.10 USDC per call via x402 micropayment

## Facts

- Endpoint: POST https://draconic21-x402-api.onrender.com/v1/signal_history?utm_source=zero.xyz
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/draconic21-daily-agent-signal-signal-history-1cbd132a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rP44czsTPYsJKavVwt-RX

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 draconic21-daily-agent-signal-signal-history-1cbd132a -d '<json body>'
```

Example prompt: Can you pull the draconic21 daily agent signal history for the last 14 days so I can see how the signal has trended?

## When to prefer this

Use this endpoint when you need multiple days of historical signal data rather than just the latest signal. It costs $0.10 USDC vs $0.03 for signal_latest, so prefer it only when trend analysis or backtesting over several days is required. Use signal_latest for real-time single-day needs; use signal_delta for change-focused queries.

## Known failure modes

- HTTP 402 Payment Required if x402 USDC payment on Base is not included or fails
- Request rejected if 'days' parameter is out of range (must be 1-30)
- Limited historical depth due to archive_day_count=1 — multi-day requests may return incomplete data
- Service unavailability due to hosting on Render free tier (cold starts possible)
- Invalid JSON body returns 400 Bad Request

## How this service works

GO-TO product for funded agents: Daily Agent Signal (POST /v1/signal_latest $0.03, /v1/signal_history $0.10, /v1/signal_delta $0.05). Signal is the flagship; supporting/legacy routes are demoted. Archive honesty: archive_day_count=6 — 6 stored dates from 2026-09-19 through 2026-09-27. Intraday revisions do not add archive days. Unpaid calls return HTTP 402. USDC on Base. Free discovery: /, /agents.md, /llms.txt, /skill.md, /.well-known/x402.json, /.well-known/mcp.json, /openapi.json.

## Output

Returns an array of historical daily agent signal records spanning the requested number of days (up to 30), sourced from a single-day seed archive dated 2026-09-19. Note: archive depth is currently limited (archive_day_count=1), so multi-day results may be sparse or synthetic beyond the seed date. Each record likely contains the daily signal value and associated date metadata.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "days": {
   "type": "integer",
   "maximum": 30,
   "minimum": 1,
   "description": "Most recent stored editions to return"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "brand": "draconic21",
  "product": "signal_history"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/draconic21-daily-agent-signal-signal-history-1cbd132a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from draconic21-x402-api.onrender.com](https://www.zero.xyz/host/draconic21-x402-api.onrender.com/llms.txt)