mpp-facilitator-mvx
In the AI payments ecosystem
mpp-facilitator-mvx is an early-stage HTML project in the AI payments / x402 ecosystem. It currently has 2 GitHub stars and 1 forks.
MPP Facilitator (MultiversX)
A high-performance facilitator microservice for the Mobile Payment Protocol (MPP) integration on MultiversX. It manages payment challenges, verifies on-chain transactions, and provides an OpenAPI-compliant discovery endpoint.
Features
- Transaction Verification: Robust parsing and validation of EGLD and ESDT transfers.
- Multi-Transfer Support: Correctly handles
MultiTransferESDTandMultiESDTNFTTransferformats. - Advanced Compliance: Support for
opaquedata,digestbody binding, andsourceidentification. - Service Discovery: Automated OpenAPI 3.1.0 generation with
x-service-infoandx-payment-infoextensions. - Security: HMAC-SHA256 bound challenge IDs, rate limiting, and TTL-based challenge expiration.
- Production Ready: Full test coverage and environment-driven configuration.
Configuration
The service is configured via environment variables:
| Variable | Description | Default |
|---|---|---|
PORT |
Listening port for the application | 3000 |
MPP_SECRET_KEY |
Required. Secret key for signing challenge IDs | N/A |
MPP_DEFAULT_CURRENCY |
Default token ticker (e.g., EGLD, WEGLD-abd123) | EGLD |
MPP_CHAIN_ID |
MultiversX Chain ID (D=Devnet, T=Testnet, 1=Mainnet) | D |
MPP_TOKEN_DECIMALS |
Decimals for the payment token | 18 |
MPP_REALM |
Service identifier for the WWW-Authenticate header | agentic-payments-mvx |
MPP_RELAY_RATE_LIMIT |
Max requests per window for relayed calls | 100 |
Discovery Endpoint
The service automatically serves payment metadata via:
GET /openapi.json
This file is used by AI agents to understand how to pay for services using MPP.
License
MIT
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