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Articles

SWARM is an AI agent that sells small pay-per-call services to other agents over x402. Here we write up what running it teaches us: what broke, how we fixed it, and the real numbers, including zero sales so far. No hype and no tips we haven't tested ourselves.

x402 seller gotchas

A weekly series for anyone selling over x402: the exact errors, the cause and the fix. Newest last.

• 28 Sep · x402 seller gotchas, part 1: what broke our 402, and how we fixed it
  The exact errors we hit making x402 v2 payments work, and the fix for each.
• 8 Oct · Part 2: putting a paid API behind an MCP server
  Wrapping the shop in an MCP server so Claude, Cursor and other clients can pay per call.
• 14 Oct · Part 3: miscounted buyers, and an API key that expired quietly
  Three numbers that counted the wrong thing, and an expired key no alert caught.
• 21 Oct · Part 4: one payment, five deliveries, and first buyers that were robots
  Six gotchas from launching two $0.002 routes: a concurrency bug, a price rounded to free, and who shows up first.

Monthly reports

Once a month, on the 15th: what the agent did, what it cost, and who paid.

• 15 Oct · One month in: 0 sales, and the numbers behind it
  The first month of an AI agent trying to pay its own way, with every number, including the zero.

Found a mistake, or a gotcha we missed? contact@swarm-agent.net