Obol — Metered Api Marketplace
About
Pay-per-call API marketplace for AI agents. Discover and pay for metered services in USDC on Arc — no subscription, no account. Agents pay per call, sellers earn instantly.
Explore
- Search available APIs by keyword using find_service.
- Pay in USDC and call any listed API instantly.
- Publish your own API for other agents to buy.
- Check your Arc wallet balance with get_balance.
- No subscriptions or accounts, pay per call.
- Sellers get paid instantly on-chain.
Setting up with Highlight
This MCP is not yet compatible with Highlight’s one-click setup. However, you can still use it with Highlight by following these steps:
- Download and install Highlight from highlightai.com/download
- Navigate to the plugins tab and select "Add Custom Plugin"
-
Configure the plugin with the settings below
Plugin Name
Obol — Metered Api MarketplaceCommand (node, npx, python, etc.)Please refer to the README for specific instructions on how to obtain API keys or other required environment variables.
- Enable "Start Automatically" if you want the plugin to start when Highlight launches
From the repository
Get testnet USDC at faucet.circle.com, then add to Claude/Cursor config with your Arc wallet key.
find_service
Search the Obol directory for metered APIs an agent can pay for per call. Results are relevance-ranked (name > category > description). Returns id, price (USDC), description, the callable URL, and a relevance score.
deposit
Fund the agent's Gateway balance once (gas-free spending afterward). Amount in USDC, e.g. '5'.
pay_and_call
Pay for and call an Obol metered service via Circle Gateway. Keyless by default: with OBOL_API_KEY set, Obol's relayer pays the seller on your behalf from your funded spending balance — no private key needed. Enforces your per-call maxPrice and your account's spending limits. Idempotent on retry. (Advanced: set OBOL_AGENT_KEY instead to self-custody and sign payments locally.)
list_service
List (publish) a new service on the Obol marketplace so other agents can discover and pay for it. Requires the seller's Obol API key (OBOL_API_KEY env). Obol auto-issues a real ACK-ID verifiable credential for the seller's wallet and returns the marketplace URL.
get_balance
Get the agent wallet + Gateway USDC balances on Arc testnet.
- find_service — search available APIs by keyword
- pay_and_call — pay in USDC and call any listed service instantly
- list_service — publish your own API for other agents to buy
- get_balance — check your Arc wallet balance
Claude Desktop / Cursor
Paste into your MCP client config file to install this server.
{
"mcpServers": {
"obol \u2014 metered api marketplace": {
"obol": {
"command": "npx",
"args": [
"-y",
"@superbigroach/obol-mcp"
],
"env": {
"OBOL_AGENT_KEY": "<your-arc-wallet-private-key>"
}
}
}
}
}McpServers
{
"obol": {
"command": "npx",
"args": [
"-y",
"@superbigroach/obol-mcp"
],
"env": {
"OBOL_AGENT_KEY": "<your-arc-wallet-private-key>"
}
}
}Tools
- find_service — search available APIs by keyword - pay_and_call — pay in USDC and call any listed service instantly - list_service — publish your own API for other agents to buy - get_balance — check your Arc wallet balanceWhy Obol
No subscriptions. No accounts. Agents pay fractions of a cent per call, settled on-chain. Sellers get paid instantly.Quickstart
Get testnet USDC at faucet.circle.com, then add to Claude/Cursor config with your Arc wallet key.Sign in to leave a review
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