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Agent Billing Primitives (Dirtsmith)

Official registry AI and agents

Agent billing primitives: usage metering, shared spend ledger with reserve-before-pay, lease lock.

Source code Documentation

What can you do with Agent Billing Primitives (Dirtsmith)?

  • agent_spend_ledger: hosted shared budget ledger. Actions: set_budget, reserve, settle, release, status. Reserve is atomic: concurrent agents on one budget can never exceed the ceiling. Reservations expire after ttl_s (default 900 s). Amounts...
  • agent_lease_lock: hosted lease lock. Actions: acquire, renew, release, status, with ttl_s and a monotonic fencing_token. $0.90 per 1,000 calls after 1,000 free calls a month.

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http agent-billing-primitives-dirtsmith 'https://gap-functions.bfurrow26.workers.dev/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "agent-billing-primitives-dirtsmith": {
            "type": "http",
            "url": "https://gap-functions.bfurrow26.workers.dev/mcp"
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. MCP Usage Metering
  2. Pricing and buying (no signup, no key)
  3. Inputs
  4. Legal
  5. License
  6. More tools on the same endpoint (added 2026-11-03)

MCP Usage Metering

Hosted tool that records one billable usage event per MCP tool call, idempotently, and returns an invoice preview. Built for MCP server authors who want to charge per call without building metering.

  • Endpoint (MCP): https://gap-functions.bfurrow26.workers.dev/mcp (all URLs in config.json)
  • Tool list: GET /mcp/tools · Health: GET /health
  • Contract: schema/mcp_usage_metering.v1.0.0.json (strict input, required idempotency_key, versioned 1.0.0)

Pricing and buying (no signup, no key)

  • Call the tool directly. Each IP gets 100 free keyless calls per day.
  • After that, tools/call returns isError: true with error_code: PAYMENT_REQUIRED. structuredContent.payment holds a one-click approve_and_pay_url for your human and a grant_token. Your agent asks you once, you click buy, then the agent retries the same call with header X-Grant-Token (or uses the /u/<grant_token>/mcp URL form). Same token forever.
  • Usage after purchase: $0.15 per 1,000 events ($0.00015/event), 10,000 free events per month per account.
  • Replays with the same idempotency_key are never billed twice.

Inputs

Required: tool_name, tool_version (semver), end_customer_ref, idempotency_key (8–128 chars). Optional: units, unit_label, unit_price_cents, metadata.

Terms of Service and Privacy Policy are DRAFT, pending counsel review, not yet in effect — see legal/.

License

MIT (this repository: docs and schema). Operated by Dirtsmith LLC.

More tools on the same endpoint (added 2026-11-03)

The same MCP URL (https://gap-functions.bfurrow26.workers.dev/mcp) also serves:

  • agent_spend_ledger: hosted shared budget ledger. Actions: set_budget, reserve, settle, release, status. Reserve is atomic: concurrent agents on one budget can never exceed the ceiling. Reservations expire after ttl_s (default 900 s). Amounts are integer micro-USD. $9.00 per 1,000 calls after 1,000 free calls a month.
  • agent_lease_lock: hosted lease lock. Actions: acquire, renew, release, status, with ttl_s and a monotonic fencing_token. $0.90 per 1,000 calls after 1,000 free calls a month. State is shared by namespace (16-128 chars). Any agent that knows the namespace can read and change that state, so treat it like a password. We store only its hash. Buying works the same way as metering: no signup or key, one approve-and-pay link when the free calls run out.

Frequently asked questions

What is Agent Billing Primitives (Dirtsmith)?

Agent billing primitives: usage metering, shared spend ledger with reserve-before-pay, lease lock.

How do I install Agent Billing Primitives (Dirtsmith)?

It runs as a remote server. In Claude Code: claude mcp add --transport http agent-billing-primitives-dirtsmith 'https://gap-functions.bfurrow26.workers.dev/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Agent Billing Primitives (Dirtsmith) need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is Agent Billing Primitives (Dirtsmith) open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains Agent Billing Primitives (Dirtsmith)?

It is published by throttler300. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.