PROTOCOL: stories about the x402 specification itself, governance decisions, the x402 Foundation, and the standards bodies shaping machine payments on the web.
39 stories tagged PROTOCOL, curated since April 2026.
On Thursday 14 May the Arbitrum team announced via X that x402 by Coinbase is now live on Arbitrum mainnet, extending Coinbase's CDP-hosted facilitator to a fifth chain alongside Base, Polygon, World and Solana.
On 13 May, Base creator Jesse Pollak announced that x402 now supports batched settlement: a buyer deposits ERC-20 funds into an on-chain escrow, signs offchain vouchers for each paid request, and the facilitator settles many vouchers in...
On 12 May, TACEO went live with a full Confidential x402 stack on Base Sepolia: a 3-party multi-party computation network, a confidential facilitator, on-chain contracts and a public faucet, all available with no waitlist, no gated partner...
On the Q1 2026 earnings call after the close on 7 May, Coinbase used x402 as the headline forward narrative around an otherwise weak quarter ($1.41B revenue miss vs $1.48B consensus, $394M GAAP loss).
Circle has flipped Nanopayments to mainnet on 29 April, turning Circle Gateway into a production gas-free settlement layer for USDC transfers as small as $0.000001 with off-chain verification and batched on-chain settlement.
Kite went mainnet on 30 April with Kite Chain (a native stablecoin settlement layer) and Kite Agent Passport (a programmable agent wallet that lets humans set spend caps and authorized destinations while agents transact autonomously).
Utexo has shipped a USDT settlement path on x402 using a Bitcoin-native execution layer that claims roughly 50ms finality, opening the protocol up to the largest stablecoin by float.
AWS has wired x402 into Bedrock AgentCore, shipping a reference architecture that combines Coinbase AgentKit with CloudFront and Lambda@Edge to serve and settle USDC payments at the network edge.
The x402 Foundation has merged the Cardano Specification into the main x402 repo, making Cardano an official x402 chain. The PR also accepted Masumi's Smart Contract extensions as an optional addition to the standard, bringing four...
The Graph Gateway now ships x402 support via a new @graphprotocol/client-x402 package. AI agents and apps can query any Subgraph by paying USDC on Base per request - no API key, no Studio account, no monthly cap.
Vanar open-sources xBPP under Apache 2.0, a nine-phase policy enforcement protocol that governs whether AI agents should execute transactions before reaching x402, AP2, or ACP.
Nevermined integrates Visa Intelligent Commerce with Coinbase x402, letting AI agents purchase digital goods via delegated card spending with budget caps and merchant restrictions.
Ant Group launches Anvita platform integrating Coinbase x402 protocol for autonomous agent payments via HTTP.
Solana Foundation joins x402 Foundation alongside tech giants. Per Dune dashboard cited by the piece, Solana accounts for 65% of agentic on-chain payments through x402 (other analytics sources place the figure closer to 49%).
Human.tech launches Wallet as a Protocol (WaaP) — AI agents earn autonomously with cryptographically-enforced human oversight. Permission Tokens define time limits, spending caps, and approved addresses.
UnionPay releases APOP framework — unified trust mechanism for agent-based payments. Supports agent identity lifecycle management, end-to-end intent management, SSO, and payment authorisation.
Coinbase’s x402 protocol moves under Linux Foundation as open, community-governed infrastructure. x402 Foundation includes Cloudflare and Stripe as founding members.
Ex-a16z employee Sam Ragsdale’s startup AgentCash helps AI agents pay for premium APIs via blockchain micropayments. Fortune argues AI commerce will add tens of millions of ordinary consumers to an API economy previously limited to...
Singapore’s MetaComp launches VisionX (compliance intelligence cutting false clean rates from 25% to near-zero) and AgentX (financial Skills for AI platforms like Claude). Introduces Know Your Agent (KYA) governance framework.
Solana becomes first major high-throughput chain as native MPP rail. @solana/mpp SDK handles any stablecoin on Solana including SPL tokens and Token2022. Supports split payouts and delegated signer.
Google’s Universal Commerce Protocol adds multi-item carts, real-time catalog APIs for inventory/pricing, and OAuth 2.0 identity linking. Commerce Inc, Salesforce, and Stripe announced as implementation partners.
MoonPay open-sources Open Wallet Standard — single seed phrase derives accounts across 8 chain families (EVM, Solana, Bitcoin, Cosmos, Tron, TON, XRP). AES-256-GCM key encryption. Backed by PayPal, Ethereum Foundation, Circle, OKX, Ripple.
Tempo (backed by Stripe + Paradigm) launches mainnet with Machine Payments Protocol — an open standard introducing ‘sessions’ (OAuth for money) for continuous agent micropayments.
Coinbase ships three major x402 updates: accepts all ERC-20 tokens (not just USDC), cross-chain wallet login via SIWX, and one-click MCP tool monetisation.
Sam Altman’s World integrates World ID with Coinbase x402 — AI agents carry cryptographic proof they’re backed by a verified human. Solves the identity layer that x402 payments were missing.
Stablecoin orchestration network Borderless.xyz selected as Mastercard Crypto Partner Program launch partner, connecting 14+ licensed stablecoin providers across 94+ countries to Mastercard’s 210+ country payment rails.
Coinbase’s x402 Facilitator adds Polygon L2 support alongside Base and Solana, with up to $1M in gas rebates for x402 facilitator transactions on the network.
Lightning Labs argues L402 (Bitcoin’s HTTP 402 protocol) is purpose-built for agentic payments — positioning it as the Bitcoin/Lightning answer to stablecoin-based x402. Details recent protocol updates making L402 easier to implement.
Ethereum Foundation and Virtuals Protocol launch ERC-8183, an on-chain escrow standard for AI agent transactions. Complements x402 — while x402 handles 'how to pay,' ERC-8183 handles 'how to transact with confidence' via trustless...
Stellar becomes a settlement layer for x402 — sub-5-second finality, near-zero fees (~$0.00001), and native stablecoin support. AI agents can now pay for internet services on Stellar without API keys or subscriptions.
Critical payment verification bypass discovered in x402 Solana/SVM SDK — attackers could spoof or replay signatures. Patched in v2.6.0 (npm), v2.3.0 (Python), v2.5.0 (Go). All x402 Solana integrators should upgrade immediately.
Hyperliquid achieves gasless x402 payments internally — making agent payments completely free with no fee sponsorship required. No other major chain can match this, positioning Hyperliquid as the zero-cost rail for autonomous agents.
Mastercard open-sources Verifiable Intent on GitHub — a cryptographic framework proving AI agent authorization with selective disclosure. Backed by Fiserv, IBM, Checkout.com, aligned with Google AP2/UCP.
Polygon’s Lisovo hardfork activates a $1M gas subsidy for AI agent-to-agent transactions routed through x402 facilitators — 100% gas refund on qualifying payments.
TZ APAC launches Tez402, bringing x402 to Etherlink (Tezos EVM L2). Any Etherlink API is now pay-per-request with on-chain stablecoin payments via a custom facilitator and Permit2 proxy.
AI agent initiated and completed an end-to-end payment on Santander’s production infrastructure via Mastercard Agent Pay — the first live agentic payment in the EU.
CryptoSlate enables pay-per-article at 0.09 USDC on Base via Proofivy’s x402 library, no subscriptions or accounts needed.
Agon launches on Solana devnet as a universal payment layer for x402, letting agents pay for any API from a single on-chain balance.
Circle launches nanopayments on testnet, enabling sub-cent, zero-gas transactions designed for AI agent commerce.
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