Quick start

Make a first paid call in one command. You need a wallet that can pay USDC on Base (x402) or USDC.e on Tempo (MPP), and a client that handles HTTP 402.

1. Pick a route

Live services and prices
Service	Route	Price per call	Limits
Chat - nano	`chat/nano (MPP) / chat-nano (x402)`	$0.001	up to 1,000 input / 256 output tokens
Chat - small	`chat/small (MPP) / chat-small (x402)`	$0.002	up to 8,000 input / 1,024 output tokens
Cited brief	`brief`	$0.002	a brief that cites only the quotes you supply

2. x402 on Base

N=$(openssl rand -base64 24 | tr '+/' '-_' | tr -d '=')
npx agentcash fetch https://pay.omnidev.tech/x402/chat-nano \
  --method POST --header 'content-type: application/json' \
  --header "X-Omni-Client-Nonce: $N" \
  --body '{"prompt":"hello"}' --payment-protocol x402

3. MPP on Tempo

N=$(openssl rand -base64 24 | tr '+/' '-_' | tr -d '=')
npx mppx --method POST -H 'content-type: application/json' \
  -H "X-Omni-Client-Nonce: $N" -d '{"prompt":"hello"}' \
  https://pay.omnidev.tech/v1/chat/nano

Request bodies

Chat routes: {"messages":[{"role":"user","content":"..."}], "max_tokens": 128} or {"prompt":"..."}.
Brief route: {"query":"...","citations":[{"url":"https://...","quote":"..."}]}. The brief cites only the quotes you supply.

Every paid request must carry X-Omni-Client-Nonce. See Payments and nonces.

Full contract: openapi.json · API llms.txt.