/agents · mpp simulator

HTTP 402
is now a
payment endpoint.

MPP is an open standard (Tempo × Stripe, IETF draft) for machine-to-machine payments. An agent gets a 402 challenge, signs a transfer, retries — and unlocks the resource.

GET paywalled resource

agent calls a paid API. No credentials, no API key.

Server returns 402

with WWW-Authenticate: Payment challenge specifying handle, amount, asset, memo.

Agent signs transferWithMemo

pays the @handle. Recipient gets full amount, ~8bps fee.

Retry with receipt

Authorization: Payment <txHash> — server verifies on-chain, returns 200.

research-bot ⌁ /api/mpp · tempo

0/9

$ press run simulation to begin.
# the agent will discover, challenge, sign, retry, succeed.

HTTP 402is now apayment endpoint.

HTTP 402
is now a
payment endpoint.