Micropayments

Ted Nelson coined the term, and early systems such as Millicent, presented in 1995, handled amounts from a tenth of a cent to five dollars. The W3C worked on a payment standard for HTML and stopped. News publishers tried pay-per-article models, and Blendle, the best known of them, moved to subscriptions in 2019.

The obstacle is the fixed cost per transaction. In the EU the Interchange Fee Regulation caps interchange at 0.2 percent for consumer debit cards and 0.3 percent for credit cards, but scheme and acquirer fees per transaction still make a ten-cent card payment uneconomic. Most sellers bundle small amounts into a top-up balance or one monthly bill.

Under PSD2 every online card or bank payment needs strong customer authentication unless an exemption applies. The regulatory technical standards exempt remote payments of up to 30 euros, as long as the cumulative amount since the last authentication stays at or below 100 euros or the count at five payments. Contactless payments at a terminal are exempt up to 50 euros. A stream of small online payments therefore still triggers an authentication every few transactions.

Strong customer authentication covers the rules in full. For micropayments the practical answer has been the wallet with a stored balance, where the authentication happens once at top-up and the small payments move inside the provider.

The new demand comes from software. AI agents and applications buy data and computing time per request, and a human authentication per request does not fit. x402 lets a server answer a web request with a price and lets the client pay in a stablecoin within the same exchange.

For European banks and payment institutions the question is whether these flows stay on stablecoin rails or move to euro rails. SEPA Instant settles in seconds but carries a cost per transaction, and the digital euro proposal caps the fees merchants may be charged. Machine-to-machine payments shows the same trade-off for devices.

Micropayments are payments of very small amounts, typically below a few euros and often below one euro, for digital content or services. Providers define the threshold differently: PayPal uses five pounds, Visa 20 Australian dollars.

Each payment carries a fixed processing cost, from scheme and acquirer fees to fraud checks. On a payment of a few cents that cost can exceed the amount, so providers aggregate small payments into larger charges.

Stablecoins on low-cost networks can move amounts below one cent, and protocols such as x402 build payment into web requests. The open points are the conversion to and from euros and the anti-money laundering duties of the provider.