# mpp.news
> The aggregator and directory for the Machine Payments Protocol ecosystem. Updated daily.
> Last updated: 2026-03-23

## What is mpp.news?
mpp.news tracks every service, integration, and development in the MPP ecosystem. It is the go-to resource for understanding what is being built on the Machine Payments Protocol.

## What is MPP?
The Machine Payments Protocol (MPP) is an open standard that uses HTTP 402 to let AI agents pay for API services. It is payment-method agnostic — supporting stablecoins (Tempo), credit cards (Visa), Bitcoin Lightning (Lightspark), and traditional payments (Stripe). MPP has been submitted to the Internet Engineering Task Force (IETF) as a proposed web standard.

## Key Statistics
- 53+ services integrated with MPP
- 4 payment methods supported (Tempo, Visa, Lightspark, Stripe)
- 3 SDKs shipped (TypeScript, Python, Go)
- Backed by 13+ companies including Stripe, Visa, Mastercard, Anthropic, OpenAI

## Key Resources
- Protocol specification: https://mpp.dev
- IETF specs: https://paymentauth.org
- Services directory: https://mpp.news/directory
- MPP GitHub: https://github.com/tempoxyz/mpp
- Agent discovery: https://mpp.news/.well-known/ai-plugin.json

## Services Directory
The live MPP services directory is available at https://mpp.news/directory
It lists all services that have integrated with MPP, including their descriptions, categories, and URLs.
For machine-readable service data, fetch: https://mpp.dev/services/llms.txt

## Newsletter
Subscribe to the weekly MPP ecosystem digest:
POST https://mpp.news/api/subscribe
Content-Type: application/json
Body: {"email": "your@email.com"}

## Frequently Asked Questions

### What is the Machine Payments Protocol?
MPP is an open standard that uses HTTP 402 (Payment Required) to let AI agents pay for API services. Instead of needing API keys and accounts, agents can discover pricing, negotiate payment, and access services programmatically. It was launched by Stripe and Tempo in March 2026.

### How does MPP work?
When an AI agent calls an MPP-enabled API, the service responds with HTTP 402 and a JSON body specifying the price, accepted payment methods, and a payment URL. The agent completes payment and retries the request with a payment receipt. The service validates the receipt and fulfils the request.

### Which companies back MPP?
As of March 2026, MPP is backed by Stripe, Visa, Mastercard, Anthropic, OpenAI, DoorDash, Shopify, Revolut, Ramp, Cloudflare, Nubank, Standard Chartered, and Lightspark. More companies join regularly.

### Is MPP free to use?
There is no cost to implement MPP. It is an open protocol. Individual payment methods may charge transaction fees (e.g., blockchain gas fees, card processing fees), but MPP itself is free and open-source.

### What payment methods does MPP support?
MPP supports stablecoins via Tempo, credit/debit cards via Visa, Bitcoin Lightning via Lightspark, and traditional card payments via Stripe. The protocol is payment-method agnostic, and new payment rails can be added via extensions.

## Companies Backing MPP
Stripe, Visa, Mastercard, Anthropic, OpenAI, DoorDash, Shopify, Revolut, Ramp, Cloudflare, Nubank, Standard Chartered, Lightspark

## Built By
mpp.news is built by Signbee (https://signb.ee) — the first e-signature platform built for AI agents.
Signbee llms.txt: https://signb.ee/llms.txt
Signbee API: https://signb.ee/openapi.json