x402 marketplace developer guide

590K AI Agents Are Looking for Paid APIs. Here's How to Reach Them

August 3, 2026

The supply gap is real

The x402 Foundation — backed by AWS, Google, Stripe, Visa, Mastercard, and 35 others — just hit 169 million transactions across the ecosystem. Coinbase alone processed ~119 million of them on Base. Solana did ~35 million. There are over 590,000 buyer agents sending x402 requests every month.

But here's the thing: there are only about 100,000 seller services. That's a 6:1 demand-to-supply ratio. Agents are looking for APIs to pay for. There aren't enough sellers.

If you have an API — any API — that an AI agent might find useful, now is the time to list it. The infrastructure is built, the buyers are there, and the payment rails are live.

Why list on minia2a.uk?

minia2a is one of the largest open marketplaces for x402-compatible agent services. Unlike app stores that require KYC, API keys, and platform lock-in, minia2a is:

• Zero setup — No API key management. No OAuth. No human approval. Agents pay per call via x402 + USDC.
• Auto-trial — Every new IP gets 20 free calls. Agents try before they commit. No friction.
• Instant discovery — Your service appears in the catalog, the .well-known/x402 directory, the MCP registry, and x402-compatible crawlers like CDP Bazaar and x402-list.
• Multi-network — Accept USDC on Base, Celo, Polygon, and more. One listing, all chains.
• 5% fee only on paid calls — Trials are free. You keep 95% of revenue.

List your API in 30 seconds

You need three things:

1. An HTTP endpoint that takes a request and returns a response
2. An Ethereum wallet address (for receiving USDC payments)
3. One curl command

That's it. Here's the registration:

curl -X POST https://minia2a.uk/api/register \
  -H "content-type: application/json" \
  -d '{
    "name": "My Cool API",
    "endpoint": "https://my-api.com/run",
    "priceCents": 5,
    "wallet": "0xYOUR_WALLET",
    "description": "Does something useful for AI agents"
  }'

Once listed, your API is live immediately. Agents can call it at:

GET https://minia2a.uk/x402/proxy/my-cool-api

minia2a handles the x402 payment negotiation, the USDC settlement, and the request forwarding. You just run your API.

What kinds of APIs do agents pay for?

Based on real trial data from minia2a (August 2026), here's what agents are actually using:

But this is just what's listed so far. The 590K buyer agents are searching for all kinds of APIs: weather, news, translation, image generation, code execution, database queries, and more. If your API solves a problem an agent might have, there's demand.

How discovery works

When you list on minia2a, your service gets multiple discovery channels:

1. Catalog — Appears at /api/services and the homepage
2. .well-known/x402 — Listed in the protocol discovery endpoint that CDP Bazaar, x402-list, Dexter, and other aggregators crawl
3. MCP Registry — minia2a exposes an MCP server at /mcp that agents can connect to directly
4. Trial economy — Every new IP gets 20 free calls. Agents discover your service by trying it. If it's useful, they register and pay.

The bottom line

The agent payment infrastructure is built. The buyers are here. 590,000 AI agents are making 169 million x402 transactions a month, and they need more APIs to call.

If you're an API developer, this is your moment. The supply gap won't last forever — early movers get the traffic, the trials, and the recurring revenue. List your API on minia2a today.

Numbers sourced from: minia2a /api/stats (live), Linux Foundation x402 Foundation announcement, Coinbase Q2 2026 x402 metrics. All verifiable. No made-up stats.