Base | zFinia

Official links

From	Type	To	Evidence
base	SUPPORTS	x402	Verified
evt-base-l2-fees-enable-micropayments	DISCUSSES	base	Verified
evt-coinbase-x402-2025-05-06	DISCUSSES	base	Verified
evt-ethereum-pectra-2025-05-07	DISCUSSES	base	Verified
evt-solana-x402-support	DISCUSSES	base	Observed
svc-accessibility_contrast_calculator	RUNS ON	base	Verified
svc-data_compatibility_checker	RUNS ON	base	Verified
svc-machine_economy_changes_since	RUNS ON	base	Verified
zfinia	RUNS ON	base	Verified

15 Jan 2026
x402 seller docs list Solana alongside Base
Official seller documentation lists Base mainnet, Base Sepolia, Solana mainnet and Solana devnet as CAIP-2 identifiers. Foundry’s production policy remains Base USDC receive-only. Editorial coverage must not collapse the protocol to one chain.
ObservedSource
7 May 2025
Ethereum’s Pectra upgrade lands on mainnet
On 7 May 2025 the Ethereum Foundation recorded the Pectra mainnet upgrade. Pectra is not an agent-payments protocol; it is base-layer plumbing that affects L2 costs and account features that wallets use. x402’s commercial claim still depends on cheap L2 fees remaining cheap.
VerifiedSource
6 May 2025
Cheap L2 fees are the economic precondition x402 keeps citing
The x402 announcement contrasts earlier Bitcoin-channel micropayment experiments with modern L2 fees on Base. The commercial claim is not that fees are zero; it is that they are low enough for API-priced calls. zFinia records this as a market precondition, not as a fee oracle.
VerifiedSource
6 May 2025
Coinbase introduces x402: stablecoin payments over HTTP 402
On 6 May 2025 Coinbase Developer Platform published x402. Servers return HTTP 402 with payment requirements; clients retry with a signed payment, typically USDC on cheap L2s such as Base. The announcement explicitly targets APIs, apps and AI agents. Documentation and a reference implementation were pointed at x402.org and GitHub.
VerifiedSource