Borrowing it
Nothing to install: this file belongs to AetherCore-Dev/ag402. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/AetherCore-Dev/ag402/main/.claude/skills/sell/SKILL.mdgit clone --depth 1 https://github.com/AetherCore-Dev/ag402Wrote 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/aethercore-dev/ag402/sell)<a href="https://agentmods.dev/skills/aethercore-dev/ag402/sell"><img src="https://agentmods.dev/badge/skills/aethercore-dev/ag402/sell/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/aethercore-dev/ag402/sell"><img src="https://agentmods.dev/badge/skills/aethercore-dev/ag402/sell.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 | $0.00047 | $0.03290 |
| Opus 5.5 | $0.00019 | $0.01316 |
| Sonnet 5.5 | $0.00009 | $0.00658 |
| Haiku 4.5 | $0.00005 | $0.00329 |
Grade B, and why
sell scanned grade B with 2 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 2mo 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.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
ssh <user>@<host> "sudo mv /tmp/ag402-gateway.service /etc/systemd/system/ && sudo systemctl daemon-reload && sudo systemctl enable --now ag402-gateway" Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -s -o /dev/null -w "%{http_code}" http://127.0.0.1:4020/health How it starts
The opening of the file, as written. The whole thing — 361 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Sell — Turn Any API into a Paid x402 API
Overview
This skill converts an existing HTTP API into a paid API using the x402 payment protocol on Solana (USDC). It configures ag402 as a reverse proxy that returns 402 Payment Required to unauthenticated requests, verifies on-chain USDC payments, and forwards paid requests to the backend.
Result: A gateway URL that any x402-compatible buyer (AI agent, CLI, SDK) can call and pay per-request.
When to Use
- User says "sell", "monetize", "paywall", "charge for", "paid API", or "payment gateway"
- User wants to put an API behind x402
- User wants to deploy ag402 in provider/seller mode
- User has a running HTTP service and wants to gate it with USDC payments
Step 1: Prerequisites Check (Silent)
Check that ag402 is installed. Run silently — only speak if something is missing.
ag402 --version
If this fails, install it:
pip install ag402-core ag402-mcp
Verify again after install. If it still fails, STOP and tell the user.
Step 2: Gather Information
Treat the user as a beginner who prefers choosing over typing. Present choices, not open-ended questions. Use the defaults aggressively — only ask when truly needed.
Question 1: Backend API
Ask the user to choose:
- A) I have a running API → ask for the URL (provide
http://localhost:8000as placeholder) - B) I don't have an API yet / just want to try it → use
http://localhost:8000(ag402 will auto-start a built-in demo backend)
Most users pick B. Default to B if the user is unsure.
Question 2: Price per call
Present choices (1 USDC ≈ $1):
- A) $0.001 — micro-task (e.g., a single lookup, translation)
- B) $0.01 — light task (e.g., search query, short text)
- C) $0.05 — medium task (e.g., image analysis, long generation)
- D) Custom — let the user type a number
Default: B ($0.01) if the user doesn't pick.
Question 3: Wallet address
Ask the user to choose:
- A) I don't have a wallet / just testing → use
DemoRecipientWa11et11111111111111111111+ test mode. Tell the user: "No real money involved. You can switch to production later." - B) I have a Solana wallet address → ask them to paste it (must be ~32-44 character base58 string)
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.
- 2mo ago First seen · 361 lines · 47 tokens per session scan B 3619f4f2c44a
sell is a skill published in the GitHub repository AetherCore-Dev/ag402 (9 stars, last pushed 3mo ago), licensed MIT. It adds 47 tokens to every session and 3,290 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it B with 2 findings (asks for root, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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