MCP App StoreMCP App StoreExfer provides a permissionless proof-of-work blockchain and a CLI-first toolset for autonomous machine-to-machine commerce. It implements a UTXO model, a deterministic scripting language (Exfer Script) for covenants (HTLCs, multisig, vaults, escrow, delegation), and a JSON-RPC interface so agents can create wallets, send payments, and automate trust-minimized workflows.
Use Exfer when you need programmatic, on-chain settlement between agents or services: atomic swaps and HTLCs for escrowed payments, multisig for joint custody, timelocks for recoverable vaults, or simple wallet automation integrated into agent workflows. Ideal for experiments or integrations that require predictable costs and composable transaction scripts.
Works with agent tooling that can call command-line CLIs or HTTP JSON-RPC endpoints (general-purpose automation agents, CI runners, and bots).
Exfer is a blockchain CLI for machine-to-machine payments, HTLCs, multisig, and covenants. The SKILL.md is comprehensive and well-structured with clear command examples, but lacks bundled scripts — it's essentially a reference document for a CLI tool. Security concerns include downloading and executing binaries without checksum verification, no authentication on RPC endpoints, and shell snippets that use unquoted variables in curl commands.
Well-documented blockchain/payment skill. Primary security deductions: (1) binary downloads without checksum verification (-10), (2) shell injection risk in curl snippets with unquoted vars (-12), (3) no RPC authentication model (-6). The skill is niche — targets a very specific blockchain ecosystem with limited mainstream adoption. Architecture is decent with clear frontmatter and sections but no scripts/ or references/ directory, just a monolithic SKILL.md.
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