Mastercard and Visa are extending stablecoin technology into the systems that settle card payments between financial institutions, while leaving the consumer checkout experience largely unchanged. Mastercard completed its acquisition of stablecoin infrastructure provider BVNK in August 2026 and has expanded its network’s settlement options to include regulated stablecoins. Visa, meanwhile, is working with Stripe-owned Bridge and Lead Bank on on-chain settlement for card programs. The shift became more concrete in September, when SoFi Bank moved its credit and debit card issuing portfolio to live settlement using its bank-issued SoFiUSD. That portfolio represents more than $25 billion in annualized card volume, a measure distinct from the value settled in stablecoins. Visa separately reported an annualized stablecoin settlement run rate exceeding $25 billion in October. The networks’ initiatives target the back-end movement and reconciliation of funds, including periods when traditional bank settlement rails are unavailable; they do not require merchants to accept cryptocurrency.

Mastercard is seeking to make network tokens the payment standard for purchases initiated by AI agents. On its October 29, 2026, earnings call, Chief Executive Michael Miebach described processor-issued one-time virtual card numbers as a temporary bridge rather than a lasting approach. He said Mastercard would support end-to-end tokenization through Agent Pay to preserve cardholder choice, rewards and spending controls. The company also announced that Shopify is integrating Agent Pay and network tokens into Shop Pay, alongside a strategic partnership with OpenAI covering AI payments and services. Mastercard has been building merchant-facing tools for agentic commerce throughout 2026, but Miebach acknowledged that merchants’ technical readiness remains uneven. Other payments companies are developing their own approaches: Stripe supports agentic network tokens from Mastercard and Visa, while Visa has introduced tools for AI-driven shopping. Consumer concerns about fraud and liability remain a potential barrier to adoption.

Mastercard opened developer early access for Agent Pay for Machines (AP4M) on October 20, 2026, releasing buyer- and seller-side APIs, a sandbox and developer toolkits. In a Cloudflare Connect demonstration, marketing agency Hype tested an autonomous agent making nine payments to two merchants within a single budget, without manual billing or account setup. AP4M uses HTTP 402 payment challenges, but differs from crypto-native implementations of the x402 protocol. Its agents issue digitally signed vouchers off-chain; merchants can batch and redeem them later instead of settling every request on-chain. The pilot combined agent wallet infrastructure from Coinbase Developer Platform and BVNK, settlement on Base, and Mastercard’s multi-currency fiat and stablecoin settlement platform. Circle separately expanded its managed payments service to target AI-agent traffic using USDC. Together, the developments show competing approaches to machine-to-machine payments, with different choices about settlement, funding and who manages digital assets.

Mastercard and Visa are advancing different approaches to AI-initiated business payments. At Cloudflare Connect, Mastercard demonstrated an agent making nine payments across multiple service providers under one authorized budget. It also opened early developer access to Agent Pay APIs, a sandbox and toolkits. Visa expanded its commercial agentic suite around a BILL and Billtrust pilot, alongside spend analytics and fraud tools. The distinction is how each approach constrains the agent. Visa’s pilot lets an agent pay invoices that buyers have already approved, using its Trusted Agent Protocol to navigate supplier-portal security without sharing underlying login credentials. Mastercard is testing controls for machine-to-machine transactions, including signed vouchers, agent verification and a score intended to estimate whether an incoming transaction was AI-initiated. Both efforts leave a consequential question for business payments: how responsibility should be assigned when an authorized agent follows its technical instructions but breaches a procurement condition.

Mastercard opened developer APIs, SDKs and a sandbox for Agent Pay for Machines (AP4M) on October 21, 2026. The tools enable autonomous AI agents on Amazon Bedrock to make multi-merchant micropayments over x402 using off-chain signed vouchers. The launch follows Coinbase Developer Platform’s report that cumulative x402 payments across Base and Solana had exceeded 100 million by October. The x402 protocol uses an HTTP 402 response to tell an agent what a service costs and how to pay. Its growing infrastructure includes a Linux Foundation-governed foundation, while alternative approaches use Lightning payments or existing processor rails. Transaction counts, however, do not establish how much genuine agent-led commerce is taking place. TRM Labs found a much smaller pool of plausible commercial trade after screening out other activity. Security questions also remain, including whether a service can receive payment without delivering its output. Developers therefore face choices about settlement, spending controls and proof of service.

Mastercard has opened developer early access to Agent Pay for Machines, offering buyer- and seller-side APIs, software development kits and sandbox environments. The service remains in pilot, is not commercially available and has no announced date for a general production release. At Cloudflare Connect 2026, Mastercard Chief Product Officer Jorn Lambert demonstrated an AI agent running on Amazon Bedrock AgentCore making nine payments across two merchants under a single budget approved by marketing firm Hype. The agent paid for social media research from AIsa and eight image generations through Cloudflare AI Gateway without separate accounts or API keys. Built on the open x402 standard, Mastercard’s system uses off-chain, cryptographically signed vouchers that providers can redeem in batches. Coinbase Developer Platform provides wallet infrastructure, Base handles on-chain settlement, and BVNK processes fiat and stablecoin settlements through the Mastercard Global Money Platform. The early-access rollout gives developers a way to test the model, not a commercially available payment service.