Documentation Index Fetch the complete documentation index at: https://docs.nevermined.app/llms.txt
Use this file to discover all available pages before exploring further.
Use the Nevermined AI Skill to give your coding assistant deep knowledge of the Nevermined Payments SDK, the x402 payment protocol, and integration patterns for Express.js, FastAPI, Strands agents, MCP servers, and Google A2A.
Instead of copy-pasting docs, you import the skill once and your AI assistant knows how to wire up payments for you.
What’s Included The skill provides your coding assistant with:
SDK initialization patterns for TypeScript and PythonFramework-specific middleware (Express.js, FastAPI, Strands, MCP, Google A2A)x402 protocol flow — headers, verification, settlementPayment plan registration and configurationClient-side integration — ordering plans, generating tokens, calling protected APIsTroubleshooting for common errors (402, -32003, -32002)
Install the Skill Choose your AI coding tool below for step-by-step installation instructions.
Claude Code
Cursor
Windsurf
GitHub Copilot
Codex CLI
Cline
Amazon Q
Other / Manual
Claude Code Commands to install from the Nevermined repository:mkdir -p ~/.claude/skills tmpdir = "$( mktemp -d )" git clone --depth 1 --filter=blob:none --sparse https://github.com/nevermined-io/docs " $tmpdir " cd " $tmpdir " git sparse-checkout set skills/nevermined-payments cp -R skills/nevermined-payments ~/.claude/skills/ cd - rm -rf " $tmpdir "
This downloads the SKILL.md and all reference files into your local Claude Code skills directory. Claude Code automatically loads the skill when it’s relevant to your work. Alternative — manual installation:
Clone or download the skill files:
git clone https://github.com/nevermined-io/docs.git /tmp/nvm-docs
Copy to your personal skills directory:
cp -r /tmp/nvm-docs/skills/nevermined-payments ~/.claude/skills/
Or copy to a project-specific location:
cp -r /tmp/nvm-docs/skills/nevermined-payments .claude/skills/
Claude Code discovers skills automatically from ~/.claude/skills/ (personal) and .claude/skills/ (project). Cursor Option A — Remote rule import (recommended):
Open Cursor Settings (gear icon)
Navigate to Rules section
Click Add Remote Rule
Paste the GitHub repository URL: https://github.com/nevermined-io/docs
Cursor syncs the rules automatically
Option B — Copy rule files to your project: Download the rule file and add it to your project: mkdir -p .cursor/rules curl -o .cursor/rules/nevermined-payments.mdc \ https://raw.githubusercontent.com/nevermined-io/docs/main/.cursor/rules/nevermined-payments.mdc
The .cursor/rules/*.mdc format supports glob-based activation — the Nevermined rule auto-activates when you work with .ts, .js, or .py files. Windsurf (Codeium) Copy the rule file to your project’s Windsurf rules directory: mkdir -p .windsurf/rules curl -o .windsurf/rules/nevermined-payments.md \ https://raw.githubusercontent.com/nevermined-io/docs/main/.windsurf/rules/nevermined-payments.md
Windsurf automatically discovers rules from .windsurf/rules/ and applies them based on their activation mode. Windsurf rules have a 6,000-character limit per file. The Nevermined rule file stays within this limit with the most essential patterns. For the full reference, point your assistant to the SKILL.md.
GitHub Copilot Repository-wide instructions: Add the instructions file to your project: mkdir -p .github curl -o .github/copilot-instructions.md \ https://raw.githubusercontent.com/nevermined-io/docs/main/.github/copilot-instructions.md
Copilot reads .github/copilot-instructions.md automatically for every request within the repository. Path-specific instructions (optional): For more targeted activation, create a file at .github/instructions/nevermined.instructions.md: --- applyTo : "**/*.ts,**/*.tsx,**/*.js,**/*.py" --- When working with Nevermined payments, use the patterns from .github/copilot-instructions.md
OpenAI Codex CLI Codex CLI reads AGENTS.md files for project context. Add it to your project: curl -o AGENTS.md \ https://raw.githubusercontent.com/nevermined-io/docs/main/AGENTS.md
Codex CLI discovers AGENTS.md automatically by scanning from the current directory up to the repository root. Alternative — install as a Codex skill: mkdir -p .agents/skills cp -r skills/nevermined-payments .agents/skills/
Codex CLI detects skills from .agents/skills/ and loads them when relevant. Cline (VS Code) Copy the rule file to your project: mkdir -p .clinerules curl -o .clinerules/nevermined-payments.md \ https://raw.githubusercontent.com/nevermined-io/docs/main/.clinerules/nevermined-payments.md
Cline discovers all .md files in the .clinerules/ directory and applies them based on the paths frontmatter. The Nevermined rule activates for .ts, .js, and .py files. You can also create rules through the Cline UI: click the + button in the Rules popover below the chat input. Amazon Q Developer Copy the rule file to your project: mkdir -p .amazonq/rules curl -o .amazonq/rules/nevermined-payments.md \ https://raw.githubusercontent.com/nevermined-io/docs/main/.amazonq/rules/nevermined-payments.md
Amazon Q automatically uses rules from .amazonq/rules/ as context. You can toggle rules on/off via the Rules button in the Amazon Q chat panel. ChatGPT, Claude.ai, or any other assistant Share the skill content directly with your assistant:
Open the SKILL.md file
Copy the contents
Paste into your assistant’s context, knowledge base, or system prompt
For a more concise version, use the AGENTS.md file Tool Config File Auto-Activates Claude Code ~/.claude/skills/nevermined-payments/SKILL.mdYes — when relevant Cursor .cursor/rules/nevermined-payments.mdcYes — on .ts, .js, .py files Windsurf .windsurf/rules/nevermined-payments.mdYes — model decides GitHub Copilot .github/copilot-instructions.mdYes — always Codex CLI AGENTS.md or .agents/skills/nevermined-payments/Yes — always or when relevant Cline .clinerules/nevermined-payments.mdYes — on .ts, .js, .py files Amazon Q .amazonq/rules/nevermined-payments.mdYes — always
Example Prompts After installing the skill, try prompts like:
Add payments to Express.js “Add Nevermined x402 payment protection to my Express.js API. I want to charge 1 credit per request on the /ask endpoint.”
Protect a FastAPI endpoint “Integrate Nevermined payments into my FastAPI app. Use dynamic credits based on the token count in the response.”
Build a paid MCP server “Create an MCP server with Nevermined payments. Register a weather tool that costs 5 credits per call.”
Add payments to a Strands agent “Protect my Strands agent tool with the @requires_payment decorator. Charge 2 credits per call.”
Alternative: Use the MCP Search Server If you prefer real-time documentation search over a static skill, you can connect your coding assistant to the Nevermined MCP documentation server:
{ "mcpServers" : { "nevermined-docs" : { "url" : "https://docs.nevermined.app/mcp" } } }
This gives your assistant the ability to search the full Nevermined documentation on-demand. See Build Using Nevermined MCP for details.
Skill vs. MCP Server Approach Best For Tradeoff AI Skill (SKILL.md)Fast, offline-capable, consistent patterns Static — update when SDK changes MCP Search Server Always up-to-date, full doc coverage Requires network, slower per-query
For the best experience, use both: install the skill for core patterns and connect the MCP server for edge cases.
What’s Next?
5-Minute Setup Register your first agent and plan
Express.js Integration Full Express.js payment middleware guide
FastAPI Integration Full FastAPI payment middleware guide
MCP Integration Build monetizable MCP servers
