x402作者： coinbase

Discover and call paid APIs using the X402 payment protocol with automatic USDC payments on Base. Search a bazaar of paid services by keyword, list all available resources, or inspect an endpoint's price and requirements without paying Make authenticated requests to X402 endpoints with automatic USDC payment in atomic units, supporting GET, POST, PUT, DELETE, and PATCH methods Includes query parameters, custom headers, request body support, and max-amount spending limits to control payment...

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

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x402 Payment Protocol

Use the npx [email protected] 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 [email protected] 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 [email protected] 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 [email protected] 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 [email protected] 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 [email protected] x402 bazaar search "weather"

# Search with more results
npx [email protected] x402 bazaar search "sentiment analysis" -k 10

# Check what an endpoint costs
npx [email protected] x402 details https://example.com/api/weather

# Make a GET request (auto-pays)
npx [email protected] x402 pay https://example.com/api/weather

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

# Limit max payment to $0.10
npx [email protected] x402 pay https://example.com/api/data --max-amount 100000

# Browse all bazaar resources with full details
npx [email protected] 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 [email protected] auth login <email>) with sufficient USDC balance (npx [email protected] balance)

Error Handling

"Not authenticated" - Run npx [email protected] 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 [email protected] balance to check)