pay-for-http-request
Make HTTP requests with automatic x402 payment support using purl.
Description
This skill enables making HTTP requests to payment-gated APIs using purl, a curl-like CLI tool that automatically handles x402-based payments on EVM and Solana networks.
When to Use This Skill
When an API returns HTTP 402 (Payment Required) and supports the x402 payment protocol, purl can automatically negotiate and execute the payment to access the resource.
Common Scenarios
| Scenario | Example |
|---|
| Tool calls | Paying per request to an API service |
| Premium data feeds | Accessing real-time market data, weather, or analytics |
| Content monetization | Paying to access paywalled articles or media |
| Compute resources | On-demand access to compute or storage services |
When NOT to Use
- Regular HTTP requests that don't require payment (use
curl instead)
- APIs using traditional payment methods (credit cards, API keys with billing)
Usage
purl <URL> [OPTIONS]
purl <COMMAND>
Commands
| Command | Description |
|---|
wallet | Manage wallets (keystores) |
config | Manage configuration |
balance | Check wallet balance |
inspect | Inspect payment requirements without executing |
networks | Manage and inspect supported networks |
version | Show version information |
completions | Generate shell completions script |
topics | Display help topics (exit-codes, formatting, examples, environment) |
Request Options
Payment Options
| Option | Description |
|---|
--max-amount <AMOUNT> | Maximum amount willing to pay (in atomic units) |
--confirm | Require confirmation before paying |
--network <NETWORKS> | Filter to specific networks (comma-separated) |
--dry-run | Preview payment without executing |
Display Options
| Option | Description |
|---|
-v, --verbosity | Verbosity level (can be used multiple times: -v, -vv, -vvv) |
-q, --quiet / -s, --silent | Do not print log messages |
-i, --include | Include HTTP headers in output |
-I, --head | Show only HTTP headers |
-o, --output <FILE> | Write output to file |
--output-format <FORMAT> | Output format: auto, text, json, yaml (auto detects: text for terminal, json for pipes) |
--color <MODE> | Control color output: auto, always, never |
HTTP Options
| Option | Description |
|---|
-X, --request <METHOD> | Custom request method |
-H, --header <HEADER> | Add custom header |
-A, --user-agent <AGENT> | Set user agent |
-L, --location | Follow redirects |
--connect-timeout <SECONDS> | Connection timeout in seconds |
-m, --max-time <SECONDS> | Maximum time for the request |
-d, --data <DATA> | POST data |
--json <JSON> | Send JSON data with Content-Type header |
Wallet Options
| Option | Description |
|---|
--wallet <PATH> | Path to wallet file |
--password <PASSWORD> | Password for wallet decryption |
--private-key <KEY> | Raw private key (hex, for EVM; use wallet for better security) |
Global Options
| Option | Description |
|---|
-C, --config <PATH> | Configuration file path |
Wallet Commands
purl wallet <COMMAND>
| Command | Description |
|---|
list | List available wallets |
add | Create a new wallet (interactive) |
show <NAME> | Show wallet details |
verify <NAME> | Verify wallet integrity |
use <NAME> | Set a wallet as the active payment method |
remove <NAME> | Remove a wallet |
Wallet Add Options
| Option | Description |
|---|
-n, --name <NAME> | Name for the wallet |
-t, --type <TYPE> | Wallet type: evm or solana |
-k, --private-key <KEY> | Private key to import (hex for EVM, base58 for Solana) |
Config Commands
purl config [COMMAND]
| Command | Description |
|---|
| (none) | Show current config |
get <KEY> | Get a specific configuration value (supports dot notation) |
validate | Validate configuration file |
Examples
Basic payment request
purl https://api.example.com/premium-data
Preview payment without executing
purl --dry-run https://api.example.com/data
Require confirmation before payment
purl --confirm https://api.example.com/data
Set maximum payment amount
purl --max-amount 10000 https://api.example.com/data
Filter to specific network
purl --network base-sepolia https://api.example.com/data
Verbose output with headers
purl -vi https://api.example.com/data
Save output to file as JSON
purl -o output.json --output-format json https://api.example.com/data
POST request with JSON data
purl --json '{"key": "value"}' https://api.example.com/data
Custom headers
purl -H "Authorization: Bearer token" https://api.example.com/data
Follow redirects with custom method
purl -L -X POST https://api.example.com/data
Check wallet balance
purl balance
purl balance --network base
Inspect payment requirements
purl inspect https://api.example.com/endpoint
Wallet management
purl wallet add # Interactive wallet creation
purl wallet add --type evm # Skip type selection
purl wallet add --type solana -k KEY # Import existing key
purl wallet list # List all wallets
purl wallet use my-wallet # Switch active wallet
View supported networks
purl networks
purl networks info base
Supported Networks
| Type | Networks |
|---|
| EVM | ethereum, ethereum-sepolia, base, base-sepolia, avalanche, avalanche-fuji, polygon, arbitrum, optimism |
| SVM | solana, solana-devnet |
Prerequisites
- Create a wallet:
purl wallet add
- Set up a payment method (wallet) with funds on the desired network
- Ensure the target API supports x402 payment protocol
Environment Variables
| Variable | Description |
|---|
PURL_MAX_AMOUNT | Default maximum amount willing to pay |
PURL_NETWORK | Default network filter |
PURL_CONFIRM | Default confirmation behavior (true/false) |
PURL_KEYSTORE | Default wallet/keystore path |
PURL_PASSWORD | Wallet password (for non-interactive use) |