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 ChianW/C31 --skill c31-pricegit clone --depth 1 https://github.com/ChianW/C31Wrote 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/chianw/c31/c31-price)<a href="https://agentmods.dev/skills/chianw/c31/c31-price"><img src="https://agentmods.dev/badge/skills/chianw/c31/c31-price/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/chianw/c31/c31-price"><img src="https://agentmods.dev/badge/skills/chianw/c31/c31-price.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 | $0.00064 | $0.00924 |
| Opus 5 | $0.00032 | $0.00462 |
| Sonnet 5 | $0.00013 | $0.00185 |
| Haiku 4.5 | $0.00006 | $0.00092 |
Grade A, and why
c31-price 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 9d 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.
This is a copy
86% identical to pricing — 30 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 87 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Multilingual Triggers
| Language | Trigger phrases |
|---|---|
| EN | c31-price |
| ZH | 定价, 怎么收费 |
| JA | 価格設定, 料金体系 |
Output language: Respond automatically in the user's conversation language.
Minimalist Entrepreneur — Pricing
Channel the philosophy of The Minimalist Entrepreneur by Sahil Lavingia. Help the user set the right price.
Core Principle
Charge something. Always. There is a massive difference between free and $1. Behavioral economist Dan Ariely calls it the "zero price effect" — people will line up for free brownies but the line disappears when you charge even 1 cent. If you don't charge, you can't stay alive, and you can't learn what customers actually value.
Real-World Example: chian.io
Chian's products are knowledge-based (Investment OS, newsletters, mastermind access). For him, pricing is not about "cost + margin" but about "value capture from attention and trust." Emphasize value-based pricing and tiered access over cost-based models.
Two Pricing Models
1. Cost-Based Pricing
- Calculate your costs (hosting, time, materials, payment processing)
- Add a margin (20–50% is typical)
- Example: Retail stores buy wholesale and double the price (50% margin)
- Best for: physical products, services with clear costs
- Marketplaces like iTunes, iStockPhoto use this model
2. Value-Based Pricing
- Price based on the value to the customer, not your costs
- A feature might cost you nothing extra to deliver but be worth a lot to the customer
- Example: Netflix's multi-screen feature costs them nothing but they charge a premium
- Best for: software, digital products, services with high perceived value
Pricing Principles
-
Start low, raise over time. Prices generally go up as products improve. That's expected and healthy.
-
Pricing is not permanent. It's just another thing to iterate on. Start the discovery process, don't aim for perfection.
-
Tiered pricing is the goal. Think of it like plane tickets — economy, business, first class. Same destination, different experience. Introduce tiers as you build brand and understand your customer segments.
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.
- 9d ago First seen · 87 lines · 64 tokens per session scan A e45dda0eb101
c31-price is a skill published in the GitHub repository ChianW/C31 (1 stars, last pushed 14d ago), licensed MIT. It adds 64 tokens to every session and 924 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. It is 86% identical to pricing, differing in 30 lines, and is treated as a copy.
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