Sell API access to AI agents
A new customer segment is emerging that never sleeps, never fills in a signup form, and evaluates your product in milliseconds: AI agents spending under developer-set budgets. Selling to them is not a marketing problem — it's a protocol problem. If an agent can't discover, understand, and pay for your API programmatically, you don't exist to it.
What an agent buyer needs
Discovery: a stable, crawlable profile of what you sell (marketplace listing, llms.txt, machine-readable metadata). Understanding: a contract it can parse — OpenAPI, MCP tool schemas, or predictable JSON. Payment: a price it can read and pay in-band, which is exactly what an x402 402 challenge provides. Miss any of the three and the agent moves to the next result.
Measure yourself first
The free readiness scan checks all three axes against your live endpoint and returns a 0–100 score with specific fixes, ordered by impact. It's the same rubric the ArisPay marketplace uses to rank listings for agent queries.
Then close the payment gap
Most services that fail the scan fail on payment: agents can find and parse them but can't buy. Fixing that is one middleware line or a hosted-proxy registration — see the framework integrations for Express, Fastify, Next.js, Hono, Workers, and FastAPI.
On the buyer side, any AI agent can pay your endpoint with `npx payagent pay <url>` or the payagent SDK — the 402 challenge your route now returns is the whole integration contract.
Pricing guidance
- Agents compare prices mechanically, so being 30% cheaper is directly visible to the buyer in a way human-market pricing never is.
- Low friction beats high margin at this stage of the market: a 1–5 cent price that thousands of agents try beats a 50-cent price nobody risks.
FAQ
- Are agents really buying today?
- Agent-payable endpoints settle real USDC on Base today across the x402 ecosystem — the protocol is live, and directories of paying-agent-facing services are growing. The readiness scan shows how visible your service currently is to them.
- What's the fastest path from zero?
- Run the readiness scan, fix the highest-impact item it reports, and gate one endpoint with a 1-cent price. You can be agent-payable inside an afternoon.
Is your service agent-ready?
Run the free readiness scan — it inspects your live endpoint's discoverability, machine-readable contracts, and payment support, then tells you the highest-impact fix.