Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add thebrierfox/the-stall --skill stall-market-datagit clone --depth 1 https://github.com/thebrierfox/the-stallWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/thebrierfox/the-stall/stall-market-data)<a href="https://agentmods.dev/skills/thebrierfox/the-stall/stall-market-data"><img src="https://agentmods.dev/badge/skills/thebrierfox/the-stall/stall-market-data/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/thebrierfox/the-stall/stall-market-data"><img src="https://agentmods.dev/badge/skills/thebrierfox/the-stall/stall-market-data.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00015 | $0.00814 |
| Opus 5 | $0.00008 | $0.00407 |
| Sonnet 5 | $0.00003 | $0.00163 |
| Haiku 4.5 | $0.00002 | $0.00081 |
Grade A, and why
stall-market-data scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 92 lines — stays where its author put it; the contents beside it link to each section on GitHub.
STALL Market Data
Authoritative multi-source market data through The Stall — 200+ paid caps via standard HTTP-402 payment. Payment is handled by your agent's own wallet/payment skill (stripe-link-cli or mpp-agent) — this skill holds no credentials.
When to Use
- A market-data request where reliability or freshness matters
- The bundled
stocksskill returned nullmarket_cap/pe_ratioor rate-limited - You need multi-ticker batches, earnings calendars, analyst ratings, or on-chain data
- Research synthesis combining equity, macro, and DeFi signals
Prerequisites
Python 3.8+. No additional packages required.
Your agent needs a payment skill (stripe-link-cli or mpp-agent) to settle HTTP-402 challenges. No wallet key is read by this skill.
Quick Reference
SCRIPT=${HERMES_SKILL_DIR}/scripts/stall_client.py
# List all available caps with prices
python3 $SCRIPT caps
# Probe a cap (returns 402 challenge if payment needed)
python3 $SCRIPT call us-stock-price --ticker AAPL
# Submit payment token after your payment skill settles the 402
python3 $SCRIPT call us-stock-price --ticker AAPL --x-payment <token>
Procedure
- Run
capsto see the full catalog with prices. Pick the cap that fits the need. - Run
call <cap>— if payment is needed, a 402 challenge is returned as JSON. - Pass the challenge to your payment skill (stripe-link-cli / mpp-agent) to settle.
- Re-run
call <cap>with--x-payment <token>to get the data.
Top Caps for Equity Research
| Cap | Price | What it returns |
|---|---|---|
us-stock-price |
$0.001 | Live price, volume, change |
stock-price-multi |
$0.007 | Batch prices for multiple tickers |
earnings-calendar |
$0.005 | Upcoming earnings by week/ticker |
earnings-estimates |
$0.010 | EPS consensus + surprise history |
analyst-upgrades |
$0.010 | Recent buy/sell/hold changes |
balance-sheet |
$0.010 | Annual/quarterly financial statements |
research-synthesis |
$0.289 | AI synthesis across multiple sources |
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 10d ago First seen · 92 lines · 15 tokens per session scan A ab25e45d8546
stall-market-data is a skill published in the GitHub repository thebrierfox/the-stall (7 stars, last pushed today), licensed MIT. It adds 15 tokens to every session and 814 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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