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x402 agentic payments (Coinbase's HTTP 402 protocol). An agent skill from internet-court/internet-court-skill.
Install X402
$ npx skills add internet-court/internet-court-skill --skill x402 -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install internet-court/internet-court-skill x402 --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/internet-court/internet-court-skill.git skills-src && mkdir -p .claude/skills && cp -r skills-src/vendored/chaingpt/x402 .claude/skills/x402 && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "x402" agent skill from https://github.com/internet-court/internet-court-skill/tree/main/vendored/chaingpt/x402 into .claude/skills/x402/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "x402", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/internet-court/internet-court-skill/tree/main/vendored/chaingpt/x402Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add internet-court/internet-court-skill --skill x402 -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install internet-court/internet-court-skill x402 --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/internet-court/internet-court-skill.git skills-src && mkdir -p .agents/skills && cp -r skills-src/vendored/chaingpt/x402 .agents/skills/x402 && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "x402" agent skill from https://github.com/internet-court/internet-court-skill/tree/main/vendored/chaingpt/x402 into .agents/skills/x402/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "x402", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add internet-court/internet-court-skill --skill x402 -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install internet-court/internet-court-skill x402 --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/internet-court/internet-court-skill.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/vendored/chaingpt/x402 .cursor/skills/x402 && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "x402" agent skill from https://github.com/internet-court/internet-court-skill/tree/main/vendored/chaingpt/x402 into .cursor/skills/x402/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "x402", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/internet-court/internet-court-skill.git --path vendored/chaingpt/x402--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add internet-court/internet-court-skill --skill x402 -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install internet-court/internet-court-skill x402 --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/internet-court/internet-court-skill.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/vendored/chaingpt/x402 .gemini/skills/x402 && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "x402" agent skill from https://github.com/internet-court/internet-court-skill/tree/main/vendored/chaingpt/x402 into .gemini/skills/x402/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "x402", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install internet-court/internet-court-skill x402Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add internet-court/internet-court-skill --skill x402 -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/internet-court/internet-court-skill.git skills-src && mkdir -p .github/skills && cp -r skills-src/vendored/chaingpt/x402 .github/skills/x402 && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "x402" agent skill from https://github.com/internet-court/internet-court-skill/tree/main/vendored/chaingpt/x402 into .github/skills/x402/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "x402", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add internet-court/internet-court-skill --skill x402 -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install internet-court/internet-court-skill x402 --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/internet-court/internet-court-skill.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/vendored/chaingpt/x402 .opencode/skills/x402 && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "x402" agent skill from https://github.com/internet-court/internet-court-skill/tree/main/vendored/chaingpt/x402 into .opencode/skills/x402/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "x402", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
x402- GitHub stars
- 6.6k
- Used in
- 1 other repo
- Token cost
- ~704 tokens
- SKILL.md length
- 278 words
- Files
- 2
- Skills in repo
- 80
- Repo updated
- First seen
- Licence
- MIT
At a glance
x402 agentic payments (Coinbase's HTTP 402 protocol). An agent skill from internet-court/internet-court-skill.
- Works in 4 steps: chaingpt_x402_fetch url= from= → on 402… → Sign the typed data in the payer's wallet. → chaingpt_x402_build_payment from=… → …
- Backend & APIs work in your project
- SKILL.md covers Tools, Pay an endpoint (client flow) and Monetize your endpoint (server…
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
X402 is an agent skill from internet-court/internet-court-skill. x402 agentic payments (Coinbase's HTTP 402 protocol). Custody-free tools to pay x402-protected endpoints (build the EIP-3009 transferWithAuthorization the payer signs, assemble the X-PAYMENT header), call a facilitator (verify/settle/supported), and monetize your own API by generating PaymentRequirements. USDC on Base. Triggers: x402, HTTP 402, pay per request, agentic payment, machine payment, X-PAYMENT, transferWithAuthorization, EIP-3009, facilitator, monetize API, pay for API, agent pays.
Its SKILL.md is about 700 tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file.
It sits in Backend & APIs. It works with x402, Circle USDC and Coinbase. The repository describes itself as: The trust layer for agent-to-agent commerce — natural-language mandates, ERC-7710 delegated permissions, x402 payments, escrow, and dispute resolution as one open, catch-all… The licence is MIT.
When your agent uses it
- Backend & APIs work in your project
Example prompts
- “/x402”
Workflow steps
4 steps, taken from the first numbered list in SKILL.md.
- chaingpt_x402_fetch url= from= → on 402 you get the decoded price/payee AND the unsigned EIP-3009 typed data.
- Sign the typed data in the payer's wallet.
- chaingpt_x402_build_payment from= requirements= signature=0x… → the X-PAYMENT header.
- chaingpt_x402_fetch url= xPaymentHeader= → the paid response.
What it can do on your machine
Read from SKILL.md and the folder at commit fa89195. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
X402 loads about 704 tokens when it runs. Until then it costs about 126 tokens; SKILL.md has 278 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from internet-court/internet-court-skill at commit fa89195, republished under its MIT licence (© internet-court). 278 words, ~704 tokens.
Download SKILL.mdSave it as
.claude/skills/x402/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- x402
- description
- x402 agentic payments (Coinbase's HTTP 402 protocol). Custody-free tools to pay x402-protected endpoints (build the EIP-3009 transferWithAuthorization the payer signs, assemble the X-PAYMENT header), call a facilitator (verify/settle/supported), and monetize your own API by generating PaymentRequirements. USDC on Base. Triggers: x402, HTTP 402, pay per request, agentic payment, machine payment, X-PAYMENT, transferWithAuthorization, EIP-3009, facilitator, monetize API, pay for API, agent pays.
x402 Payments skill
x402 turns HTTP 402 Payment Required into a real payment rail for agents: a
server replies 402 with what it wants paid; the client signs an off-chain
authorization and retries with an X-PAYMENT header; a facilitator broadcasts
it. Settlement uses EIP-3009 transferWithAuthorization (e.g. USDC on Base) —
the facilitator can only broadcast the signed authorization, never alter the
amount or destination.
Custody-free: the plugin builds the EIP-712 the payer signs and assembles the header; it never holds a key.
Tools
| Tool | Purpose |
|---|---|
chaingpt_x402_decode | Decode a 402 body or X-PAYMENT header into human terms (amount/token/recipient/expiry) before paying. |
chaingpt_x402_build_payment | Build the UNSIGNED EIP-3009 typed data; pass a signature back to get the final X-PAYMENT header. |
chaingpt_x402_facilitator | Call a facilitator: supported / verify / settle. |
chaingpt_x402_create_requirements | Server side: generate the PaymentRequirements + 402 body to monetize your endpoint. |
chaingpt_x402_fetch | The whole client loop in one tool: fetch a URL; on 402 it decodes the challenge and (given from) emits the unsigned typed data; re-call with xPaymentHeader to complete the paid request. |
Pay an endpoint (client flow)
Fast path — one tool drives the loop:
chaingpt_x402_fetch url=<resource> from=<payer>→ on 402 you get the decoded price/payee AND the unsigned EIP-3009 typed data.- Sign the typed data in the payer's wallet.
chaingpt_x402_build_payment from=<payer> requirements=<from step 1> signature=0x…→ theX-PAYMENTheader.chaingpt_x402_fetch url=<resource> xPaymentHeader=<header>→ the paid response.
Manual path (same primitives, finer control): _decode → _build_payment → sign → _build_payment +signature → retry yourself.
Monetize your endpoint (server flow)
chaingpt_x402_create_requirements network=base amount=0.01 payTo=<you> → serve
the returned JSON with HTTP 402. Verify/settle incoming payments via a
facilitator (chaingpt_x402_facilitator).
Known EIP-3009 tokens: USDC on base and base-sepolia. For other tokens pass
full PaymentRequirements (with asset + extra.name/extra.version).
0 ChainGPT credits.
© internet-court, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 1 other file in vendored/chaingpt/x402 of internet-court/internet-court-skill.
- SKILL.md
- LICENSE
Open the folder on GitHubat commit fa89195
Used in 1 other repository
We found 2 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in internet-court/internet-court-skill, which our catalogue first saw on October 7, 2026.
Compare with similar skills
X402 next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| X402 this skillinternet-court/internet-court-skill | 6.6k | 1 repos | ~704 | Automated safety check: Pass | MIT | |
| CapacitrBankrBot/skills | 1.2k | — | ~3k | Automated safety check: Pass | None | |
| Payram Vs X402LeoYeAI/openclaw-master-skills | 2.2k | — | ~4.2k | Automated safety check: Pass | MIT | |
| Compare Crypto PaymentsPayRam/payram-mcp | 158 | — | ~5.4k | Automated safety check: Pass | None | |
| Agentic Walletcoinbase/agentic-wallet-skills | 126 | 2 repos | ~1k | Automated safety check: Pass | MIT | |
| Build X402 Servercoinbase/cdp-sdk | 203 | — | ~3.7k | Automated safety check: Notes | MIT |
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Related
Works with
Categories
Questions about X402
What does X402 do?
x402 agentic payments (Coinbase's HTTP 402 protocol). An agent skill from internet-court/internet-court-skill. X402 is an agent skill from internet-court/internet-court-skill. x402 agentic payments (Coinbase's HTTP 402 protocol).
When should I use X402?
X402 fits situations like: backend & APIs work in your project.
How do I install X402 in Claude Code?
Run `npx skills add internet-court/internet-court-skill --skill x402 -a claude-code`. Or copy the skill folder (vendored/chaingpt/x402 in internet-court/internet-court-skill) into .claude/skills/x402 in your project. Claude Code loads it when a task matches its description.
How do I install X402 in Codex?
Run `npx skills add internet-court/internet-court-skill --skill x402 -a codex`. Or copy the skill folder (vendored/chaingpt/x402 in internet-court/internet-court-skill) into .agents/skills/x402 in your project. Codex loads it when a task matches its description.
Can I use X402 in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add internet-court/internet-court-skill --skill x402 -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/x402, .gemini/skills/x402, .github/skills/x402 and .opencode/skills/x402 in your project.
What does X402 need to run?
SKILL.md names no scripts, command-line tools or credentials: X402 is instructions for the agent only.
Does X402 access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is X402 safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does X402 use?
X402 is published under the MIT licence (from the LICENSE file in the skill folder). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does X402 use?
About 704 tokens (SKILL.md is roughly 2.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to X402?
Skills that share tags, products or a category with X402: Capacitr (BankrBot/skills, 1.2k stars), Payram Vs X402 (LeoYeAI/openclaw-master-skills, 2.2k stars), Compare Crypto Payments (PayRam/payram-mcp, 158 stars) and Agentic Wallet (coinbase/agentic-wallet-skills, 126 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains X402?
internet-court (a GitHub organization) maintains it in internet-court/internet-court-skill, which has 6,551 GitHub stars. The repository holds 80 skills in this directory. The repository was last updated on August 19, 2026.
Source: internet-court/internet-court-skill on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.