Agent Tollgate MCP server

agent-tollgate-engine

Live at https://skinwinking.com. Machine-readable: /llms.txt, /openapi.json, MCP at https://skinwinking.com/mcp.

Pay-per-call trading intelligence and fee-bearing swap routing for autonomous agents, on Cloudflare Workers.

Revenue paths:

1. x402 micropayments in USDC (Polygon or Solana) for orderbook-imbalance (0.02 USDC) and token-audit (0.20 USDC).
2. 30 bps platform fee on swaps built by quote-and-build (Jupiter on Solana, LI.FI cross-chain/EVM).

All payments go straight to the merchant addresses in wrangler.toml. The server holds no keys and no funds.

Layout

Local run

npm install
cp .env.example .dev.vars        # then set SOLANA_RPC_URL and EVM_RPC_URL to private endpoints
npm run dev                      # http://127.0.0.1:8787, simulation receipts enabled

npm run dev sets SIMSECRET, which enables HMAC simulation receipts (Bearer sim...). Never set SIM_SECRET in production.

If port 8787 is busy: npx wrangler dev --port 8799 --var SIMSECRET:dev-simulation-secret and BASEURL=http://127.0.0.1:8799.

Simulation

With npm run dev running in another terminal:

npm run simulate

Steps: unpaid call returns 402, simulated payment succeeds, replay is rejected, a Solana swap quote proves the fee account is inside the built transaction, a Polygon to Base quote proves the LI.FI integrator fee.

Production prerequisites

1. RPC: public endpoints are rate-limited or blocked. Use private ones.

npx wrangler secret put SOLANA_RPC_URL
   npx wrangler secret put EVM_RPC_URL

1. LI.FI integrator: register LIFI_INTEGRATOR at https://portal.li.fi, set the fee wallet to the EVM payout address, and set the fee to 0.3%. Without it LI.FI rejects quotes that carry fee.
2. Solana fee token accounts: the Jupiter fee is paid in the output token to the merchant's associated token account for that mint. The route returns FEEACCOUNTMISSING until that account exists. Receiving a small amount of the token (or creating the ATA in Phantom) creates it. USDC and wSOL cover the main pairs.
3. Optional X402FACILITATORURL enables X-402-Signature settlement through an x402 facilitator.

Deploy

npx wrangler deploy

Attach the domain under Workers & Routes in the Cloudflare dashboard (custom domain on the worker).

Payment proofs

Each proof is accepted once (Durable Object, 7 day TTL).