Head-to-head
x402 vs Agent Pay for Machines
x402 is an open protocol anyone can implement with a facilitator such as Coinbase (first 1,000 transactions free, then $0.001). On Stripe the matrix reads x402 live and Agent Pay for Machines announced, and the two split on 6 more columns. For a head of ecommerce engineering: Start with plain x402; AP4M adds controls when your buyers are enterprises.
The sourced difference
x402 is an open protocol anyone can implement with a facilitator such as Coinbase (first 1,000 transactions free, then $0.001). Agent Pay for Machines wraps x402 with Mastercard credentialing, spend controls and settlement, and is in Early Access with no published price. mastercard.com, read 4 Nov 2026.
Verdicts by reader type
- Head of ecommerce engineering
- Start with plain x402; AP4M adds controls when your buyers are enterprises.
- Payments lead
- AP4M offers guaranteed settlement across rails; x402 alone settles onchain.
Side by side
| Measure | x402 | Agent Pay for Machines |
|---|---|---|
| Kind | Protocol | Protocol |
| Operator | x402 Foundation (Linux Foundation) | Mastercard |
| Homepage | x402.org | ap4m.build |
| Matrix cells with a stated status | 3 live, 0 pilot, 1 announced | 0 live, 1 pilot, 7 announced |
| Published pricing | No pricing statement on file | No pricing statement on file |
| A limit worth knowing | Does not offer chargebacks on stablecoin payments. | Is not a consumer checkout program. |
| Merchant of record | Seller | Seller of the service |
| Dispute rules | None | Not published |
| Live surfaces | API and agent tools | None |
| Cost | Network fees only | Not published |
Column by column: where the statuses differ
7 of 27 columns read differently for x402 and Agent Pay for Machines on 4 Nov 2026.
Read the profiles
Sources
- Watch Mastercard Agent Pay for Machines in action, read 4 Nov 2026
- x402.org, read 4 Nov 2026
- ap4m.build/info, read 4 Nov 2026
- Linux Foundation launches the x402 Foundation, read 4 Nov 2026
- Mastercard launches Agent Pay for Machines, read 4 Nov 2026
Last reviewed