x402

Q: How do I install x402?

Run npx skills add https://github.com/coinbase/agentic-wallet-skills --skill x402 in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/x402/ (personal) or .claude/skills/x402/ (project).

by coinbase OfficialBackend & APIs

Search for new services and make paid API requests using the x402 payment protocol. Use when you don't have a clear tool to choose, search the bazaar. You can also use this tool if you or the user want to call an x402 endpoint, discover payment requirements, browse the bazaar, or search for paid services.

Installs: 3K
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Security: Not audited

Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/coinbase/agentic-wallet-skills --skill x402

01
Install
Run the command in your project. The CLI asks which agents to install for.
02
Describe the task
Ask your agent for something this skill covers. It loads x402 automatically when relevant.
03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

x402 Payment Protocol

Use the npx awal@2.10.0 x402 commands to discover, inspect, and call paid API endpoints using the X402 payment protocol. Payments are made in USDC on Base.

Workflow

The typical x402 workflow is:

Find a service - Search the bazaar or get details for a known endpoint
Check requirements - Inspect price, method, and input schema
Make the request - Call the endpoint with automatic USDC payment

Commands

Search the Bazaar

Find paid services by keyword using CDP's vector search:

npx awal@2.10.0 x402 bazaar search <query> [-k <n>] [--network <network>] [--scheme <scheme>] [--max-price <price>] [--json]

Option	Description
`-k, --top <n>`	Number of results, 1–20 (default: 20)
`--network <name>`	Filter by chain (base, base-sepolia, polygon, solana, solana-devnet)
`--scheme <scheme>`	Filter by payment scheme: `exact` or `upto`
`--max-price <price>`	Maximum price in USD (e.g. `0.01`)
`--asset <address>`	Filter by payment asset address
`--pay-to <address>`	Filter by recipient wallet address
`--extensions <type>`	Filter by extension type (e.g. `outputSchema`, `bazaar`)
`--json`	Output as JSON

List Bazaar Resources

Browse all available resources:

npx awal@2.10.0 x402 bazaar list [--network <network>] [--full] [--refresh] [--json]

Option	Description
`--network <name>`	Filter by chain (base, base-sepolia, polygon, solana, solana-devnet)
`--full`	Show complete details including schemas
`--refresh`	Re-fetch resource index from CDP API
`--json`	Output as JSON

Discover Payment Requirements

Inspect an endpoint's x402 payment requirements without paying:

npx awal@2.10.0 x402 details <url> [--json]

Auto-detects the correct HTTP method (GET, POST, PUT, DELETE, PATCH) by trying each until it gets a 402 response, then displays price, accepted payment schemes, network, and input/output schemas.

Make a Paid Request

Call an x402 endpoint with automatic USDC payment:

npx awal@2.10.0 x402 pay <url> [-X <method>] [-d <json>] [-q <params>] [-h <json>] [--max-amount <n>] [--json]

Option	Description
`-X, --method <method>`	HTTP method (default: GET)
`-d, --data <json>`	Request body as JSON string
`-q, --query <params>`	Query parameters as JSON string
`-h, --headers <json>`	Custom HTTP headers as JSON string
`--max-amount <amount>`	Max payment in USDC atomic units (1000000 = $1.00)
`--correlation-id <id>`	Group related operations
`--json`	Output as JSON

Examples

# Search for weather-related paid APIs
npx awal@2.10.0 x402 bazaar search "weather"

# Search with more results
npx awal@2.10.0 x402 bazaar search "sentiment analysis" -k 10

# Check what an endpoint costs
npx awal@2.10.0 x402 details https://example.com/api/weather

# Make a GET request (auto-pays)
npx awal@2.10.0 x402 pay https://example.com/api/weather

# Make a POST request with body
npx awal@2.10.0 x402 pay https://example.com/api/sentiment -X POST -d '{"text": "I love this product"}'

# Limit max payment to $0.10
npx awal@2.10.0 x402 pay https://example.com/api/data --max-amount 100000

# Browse all bazaar resources with full details
npx awal@2.10.0 x402 bazaar list --full

USDC Amounts

X402 uses USDC atomic units (6 decimals):

Atomic Units	USD
1000000	$1.00
100000	$0.10
50000	$0.05
10000	$0.01

Prerequisites

Search/Details: No authentication needed
Pay: Must be authenticated (npx awal@2.10.0 auth login <email>) with sufficient USDC balance (npx awal@2.10.0 balance)

Error Handling

"Not authenticated" - Run npx awal@2.10.0 auth login <email> first
"No X402 payment requirements found" - URL may not be an x402 endpoint
"CDP API returned 429" - Rate limited; cached data will be used if available
"Insufficient balance" - Fund wallet with USDC (npx awal@2.10.0 balance to check)

FAQ

What does the x402 skill do?

How do I install x402?

Run npx skills add https://github.com/coinbase/agentic-wallet-skills --skill x402 in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/x402/ (personal) or .claude/skills/x402/ (project).

Which AI agents can use x402?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is x402 safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains x402?

It is published by coinbase in coinbase/agentic-wallet-skills, and it is an official skill from the maker of the technology it covers. It has 3,018 recorded installs.