simmer-x402 SKILL.md skillA
simmer-x402 from spartanlabsxyz/simmer-sdk is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add spartanlabsxyz/simmer-sdk/simmer-x402@v1.0.10Pins v1.0.10 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- spartanlabsxyz/simmer-sdk
- Path
skills/simmer-x402/SKILL.md- Versions recorded
- 6
- Latest version
- v1.0.10, committed Oct 16, 2026
- First version recorded
- Mar 11, 2026
- Size
- 7,588 bytes
- Repository stars
- 56
- License
- MIT
Make x402 payments, handle HTTP 402 Payment Required responses, check Base wallet balances, or access Simmer premium endpoints and other paid APIs. Uses USDC on Base.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# x402 Payments Pay for x402-gated APIs using USDC on Base. This skill enables agents to autonomously make crypto payments when accessing paid web resources. > 🚨 **Framework for x402 payment plumbing, not financial advice.** Read [DISCLAIMER.md](./DISCLAIMER.md) before connecting to a wallet with real funds. Cap per-call payments with `--max <USD>` or the `X402_MAX_PAYMENT_USD` env var; the wallet should be a scoped working-capital wallet, not your treasury. > **This is a template.** The default `x402_cli.py` handles 402 detection, payment-payload construction, and balance checks. Bring your own policy for which endpoints to pay for, what max payment per call is acceptable, and how to scope the funded wallet. ## Setup 1. **Install the Simmer SDK** ```bash pip install simmer-sdk ``` 2. **Set your wallet private key** ```bash export EVM_PRIVATE_KEY=0x...your_private_key... ``` Falls back to `WALLET_PRIVATE_KEY` if `EVM_PRIVATE_KEY` is not set (same key Simmer/Polymarket users already have). Your EVM address works on all chains — Polygon for trading, Base for x402 payments. 3. **Fund with USDC on Base** …
Read the whole file at its exact version.
How to install
mdr add spartanlabsxyz/simmer-sdk/simmer-x402@sha256:e83384b8fd5779d9The line at the top of this page pins the label v1.0.10, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_pilqlwccai4tspxd)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 6 versions of this file, between Mar 11, 2026 and Oct 16, 2026, about one every 44 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0.10 latest | 2026-10-16 | 25c80f4 | 7,588 B | A | view · diff |
| v1.0.9 | 2026-05-23 | 045a3a3 | 8,010 B | A | view · diff |
| v1.0.8 | 2026-04-23 | 205a763 | 7,444 B | A | view · diff |
| v1.0.7 | 2026-04-22 | 7f26a2b | 7,444 B | A | view · diff |
| v1.0.2 | 2026-04-16 | 465b786 | 7,444 B | A | view · diff |
| v1.0.2 | 2026-03-11 | 59386c5 | 7,369 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (7588 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
spartanlabsxyz/simmer-sdk · 56 stars · license MIT · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_pilqlwccai4tspxd GET https://markdownregistry.com/api/v1/resolve?ref=spartanlabsxyz/simmer-sdk/simmer-x402 GET https://markdownregistry.com/api/v1/blob/e83384b8fd5779d9c5641ad9867a45471b5807f82e9c78baf393b7d5ae0a2dfa
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.