A live stack I designed, shipped, and operate — every link below is running in production right now. MCP servers, x402 payments, a multi-aggregator swap router, auth + usage metering, Ed25519-signed trust responses, EVM/Base backends.
The trust-infrastructure product elsewhere on this site (see paladinfi.com) is mine end-to-end — I built and run it solo. It's the best evidence of how I work.
You work directly with the person who built and runs everything above — no handoffs, no juniors. Production-grade, with adversarial review on anything that signs or moves funds. Everything ships with runbooks, docs, and a clean handoff — the code and infra are yours, no lock-in.
e.g. "x402-gate your existing API with USDC settlement on Base, deployed to your infra" — typical scope 1–2 weeks, fixed bid available. You keep custody of keys and prod access throughout — I work in your environment and sign nothing on your behalf. Or an MCP server for your product; an auth + metering layer; a Base swap/routing backend.
A small team shipping a crypto / AI-agent product with no infra hire yet, that needs x402 / MCP / agent-auth / signing / routing shipped in days, not a quarter.
The same payments, auth, usage-metering, API, and signing engineering isn't crypto-specific — those primitives (FastAPI + Postgres + IAM auth, usage metering, signed APIs) are stack-agnostic. AI-agent products that aren't crypto-native, and general production backends, are in scope too. The stack above is crypto-heavy because that's what I've been shipping — but it's the proof, not the boundary: if you need senior infrastructure shipped fast, start with the piece you're stuck on, whether that's an integration, an auth/metering layer, or a backend that needs to ship.
Available for a small number of fractional + contract builds. $185/hr, or $6k/mo retainer (~32 hrs, priority turnaround). Low-risk start: a paid, fixed-fee 1-week scoped pilot you can walk away from.