Early access · built on x402
Paste your API.
Get paid when AI agents call it.
Set a per-call price on an endpoint you already run. Agents pay in stablecoins over HTTP 402, and the result is released the moment payment settles. No wallets to set up. No code changes.
How it works
Three steps from endpoint to revenue.
- 01
Paste your endpoint
Point midday at an API you already run. We put a payment-aware URL in front of it.
- 02
Set a price per call
Pick a USD price per request. Agents see it in a standard x402 402 response.
- 03
Get paid per request
Agents pay, your API answers, funds land in your own wallet. midday keeps 3%.
No wallets to set up
A non-custodial seller wallet is created for you automatically. You hold it and withdraw whenever you like.
Honest charging
Agents are only charged when the call succeeds. Paid and served, or not charged. No half-charged requests.
API + MCP server
Headless and API-first, with an OpenAPI spec. Or let your agent manage listings through our MCP server.
Any chain
Cardano-first with USDM, Base with USDC, and chain-agnostic by design as x402 grows.
For developers
Speaks HTTP. Works with any agent.
x402 is an open, HTTP-native payment flow. Any agent that understands a 402 can pay your endpoint, with no SDK lock-in. Manage everything headlessly through the API, its OpenAPI spec, or the MCP server.
- OpenAPI spec for every seller action
- MCP server for agent-driven setup
- Withdraw to any address, any time
# 1. An agent calls your monetised endpoint
curl -i https://pay.midday.day/your-api/v1/weather?city=Lisbon
HTTP/1.1 402 Payment Required
{ "x402Version": 1, "accepts": [{ "network": "cardano",
"asset": "USDM", "maxAmountRequired": "0.002" }] }
# 2. It retries with a signed payment, gets the result
curl https://pay.midday.day/your-api/v1/weather?city=Lisbon \
-H "X-PAYMENT: <signed-payment>"Waitlist
Be first to monetise your API.
midday is in early access. Nothing is for sale yet. Tell us what you'd list and we'll reach out when it opens, worldwide.