The Agent CLI lets you ship a standalone binary for your service. Agents download it once, run --install, and then interact with your API by name — no HTTP knowledge required.
# Agent installs once
./my-service-darwin-arm64 --install
# → { "installed": "/Users/alice/.local/bin/my-service", "inPath": true }
# Then uses it from anywhere
my-service discover
my-service request --plan basic
For Sellers: Generating the Binary
The buildCli() function compiles a self-contained binary with your service URL baked in. Agents receive a binary that already knows where to connect — no configuration required on their end.
1. Install the CLI builder
The CLI builder is included in the Key0 SDK. No extra install needed.
2. Create a build script
Add a build-cli.ts to your project:
import { buildCli } from "@key0ai/key0/cli";
const result = await buildCli({
name: "my-service",
url: process.env.KEY0_PUBLIC_URL ?? "https://api.example.com",
// Cross-compile for all platforms your agents run on.
// Omit targets (or pass []) to build for the current platform only.
targets: ["bun-linux-x64", "bun-darwin-arm64", "bun-darwin-x64"],
outputDir: "./dist/cli",
});
for (const bin of result.binaries) {
const mb = (bin.size / 1024 / 1024).toFixed(1);
console.log(`✓ ${bin.path} (${mb} MB)`);
}
3. Build
bun run build-cli.ts
# ✓ ./dist/cli/my-service-linux-x64 (63.2 MB)
# ✓ ./dist/cli/my-service-darwin-arm64 (57.9 MB)
# ✓ ./dist/cli/my-service-darwin-x64 (66.1 MB)
4. Distribute
Upload the binaries to your CDN or GitHub Releases. Each agent downloads the binary for their platform.
Tell agents the download URL for their platform in your service’s README or agent card description. A platform-specific URL like https://cdn.example.com/cli/my-service-darwin-arm64 is all they need.
For Agents: Installing and Using the CLI
Install
# 1. Download the binary for your platform
curl -fsSL https://cdn.example.com/cli/my-service-darwin-arm64 -o my-service
chmod +x ./my-service
# 2. Self-install to PATH
./my-service --install
# → { "installed": "/Users/alice/.local/bin/my-service", "inPath": true, "addToPath": "export PATH=\"/Users/alice/.local/bin:$PATH\"" }
inPath is false, add the addToPath line to your shell config (~/.bashrc or ~/.zshrc):
export PATH="/Users/alice/.local/bin:$PATH"
~/.local/bin and /usr/local/bin fail (permissions), run with sudo:
sudo ./my-service --install
Commands
Once installed, the binary is available by name from anywhere:
# Discover available plans and pricing
my-service discover
# Request access to a plan (returns 402 challenge or access grant)
my-service request --plan basic
# Request with a payment signature (from payments-mcp)
my-service request --plan basic --payment-signature <base64-payload>
# Show help
my-service --help
# Show version and URL
my-service --version
Exit codes
| Code | Meaning |
|---|
0 | Success — access granted |
1 | Error — see error and code fields in JSON output |
42 | Payment required — 402 challenge returned, pay and retry |
// discover
{ "agentName": "My Service", "plans": [{ "planId": "basic", "unitAmount": "$0.10" }] }
// request (payment required)
{ "challengeId": "abc123", "amount": "100000", "destination": "0x...", "chainId": 84532 }
// request (access granted)
{ "token": "eyJ...", "resourceUrl": "https://api.example.com/resource/default" }
Full install + use flow (Claude Code example)
# Claude discovers the service, downloads the right binary, and installs it
curl -fsSL https://cdn.example.com/cli/my-service-darwin-arm64 -o my-service
chmod +x ./my-service
./my-service --install
# Discover plans
my-service discover
# Request access (will return 402 with payment challenge)
my-service request --plan basic
# After paying via payments-mcp, submit the signature
my-service request --plan basic --payment-signature <sig>
# Use the returned token to call the API
curl -H "Authorization: Bearer <token>" https://api.example.com/resource/default
Reference
buildCli(opts)
| Option | Type | Required | Default | Description |
|---|
name | string | ✅ | — | Binary name (e.g. "my-service") |
url | string | ✅ | — | Your service’s public URL |
targets | string[] | | ["bun-linux-x64", "bun-darwin-arm64", "bun-darwin-x64"] | Bun compile targets. Pass [] for current platform only. |
outputDir | string | | "./dist/cli" | Where to write binaries |
{ binaries: Array<{ path, target, size }> }.
Binary flags
| Flag | Description |
|---|
discover | GET /discovery — list plans |
request --plan <id> | POST /x402/access — request access or submit payment |
--payment-signature <sig> | Include with request to submit a signed payment |
--resource <id> | Resource ID (defaults to "default") |
--install | Install binary to ~/.local/bin (or /usr/local/bin as fallback) |
--help | Show usage |
--version | Show name, version, and URL |
