I'm the engineer who designed, shipped, and operates the production stack below — now open for fractional + contract builds. x402, MCP, swap routing, auth + usage metering, response signing, EVM/Base backends. Every link is live.
PaladinFi runs its own trust + swap infrastructure (see paladinfi.com); this is that same stack, available as contract engineering.
Production-grade and fast, with adversarial review on anything that signs or moves funds. You work directly with the person who built and runs the stack above — no handoffs.
e.g. "x402-gate your existing API with USDC settlement on Base, deployed to your infra" — typical scope 1–2 weeks, fixed bid available. 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.
$185/hr, or $6k/mo retainer (~32 hrs, scoped monthly). Low-risk start: a paid 1-week scoped pilot.