Microtransactions with stablecoins: sub-cent payments at scale

Card networks make payments under $1 uneconomical. Stablecoins enable sub-cent transactions that settle in seconds, unlocking pay-per-use pricing for APIs, content, and machine-to-machine commerce. The minimum viable payment drops from $0.30 to a fraction of a penny.

Why traditional rails cannot support microtransactions

Every payment rail has a minimum viable transaction size, defined by its fixed fees. Below that threshold, the cost of processing the payment exceeds the payment itself.

• Card networks charge $0.30+ per transaction as a fixed fee, plus a percentage. A $0.10 payment costs $0.30 to process. A $0.01 payment is out of the question.
• ACH costs $0.20-$0.50 per transaction. Even for domestic payments, sub-dollar transactions are uneconomical.
• FedNow improves speed but still carries per-transaction costs that make sub-cent payments impractical.

This fee floor forces businesses into pricing models that do not match how their products are actually consumed. APIs get priced in monthly subscriptions rather than per-request. Content gets bundled into all-you-can-read plans. IoT data gets batched into hourly or daily invoices. In each case, the pricing model exists because the payment rail cannot support the natural unit of value exchange.

How stablecoins enable microtransactions

Stablecoins on efficient networks remove the fee floor that makes microtransactions impossible on traditional rails.

• Sub-cent fees. On Tempo, transaction fees are denominated in stablecoins and measured in fractions of a penny. A $0.001 payment is economically viable.
• Instant settlement. Payments finalize in under one second. No batch windows, no pending states, no multi-day settlement cycles.
• Programmable metering. Smart contracts and access keys enable automated billing logic: charge per request, per minute, per byte, or per any unit of consumption. No invoicing, no reconciliation lag.
• No intermediaries. Payments move directly from payer to payee. No card network, no payment processor, no acquiring bank extracting fees from each transaction.

Key use cases

API and compute billing

Cloud providers and API services currently price by the hour, by the GB, or by monthly tier. With sub-cent stablecoin payments, billing can match actual consumption: charge per API request, per compute cycle, per inference call.

A developer using an LLM API pays $0.002 per request as they make requests, not $200/month for a tier they may underuse. The service provider receives revenue immediately rather than at month-end. Both parties benefit from pricing that reflects actual usage.

Content monetization

Subscriptions bundle content into all-or-nothing packages. Microtransactions enable true unbundling: pay $0.05 to read one article, $0.01 per minute of video, $0.001 per song stream.

For publishers, this opens revenue from the large audience that will not commit to a subscription but will pay for individual pieces. For creators, it enables direct monetization of every unit of content without platform intermediaries taking 30-50%.

Machine-to-machine payments

As IoT networks grow and AI agents become more autonomous, machine-to-machine commerce requires payment rails that operate at machine speed and machine scale.

• IoT sensor data. A weather station sells real-time data to subscribers at $0.001 per reading. An autonomous vehicle pays for traffic data per intersection.
• AI inference. An AI agent pays for LLM tokens, image generation, or code execution per unit consumed. MPP Sessions collapse unlimited micropayments into just two onchain transactions, enabling agents to transact at speeds that traditional payment rails cannot support.
• Autonomous agents. Agents that book services, purchase resources, or transact with other agents need payment primitives that work without human approval for each transaction. Tempo access keys provide scoped, time-limited authorization for exactly this purpose.

Subscriptions and recurring billing

Microtransaction infrastructure also supports subscription models. Tempo access keys with periodic spending limits let users authorize recurring charges without re-prompting or holding their keys.

A user subscribes by authorizing an access key scoped to a specific service with a per-period cap (for example, $50 per week for 50 weeks). The protocol validates each charge against the current period’s remaining allowance and resets automatically. The user sets terms once, the service charges on schedule, and the user can revoke at any time.

This same mechanism works for both human subscribers and AI agents.

Benefits beyond cost

Microtransactions with stablecoins deliver advantages beyond lower fees.

Simplified reconciliation

Every microtransaction is recorded on an immutable ledger with a unique hash, timestamp, sender, receiver, and amount. For businesses that currently batch thousands of small-value interactions into periodic invoices, per-transaction settlement eliminates the reconciliation overhead entirely. Each payment is its own receipt.

New business models

Sub-cent payments enable pricing models that were previously impossible: true pay-as-you-go APIs, per-article content access, real-time data feeds priced per data point, and machine-to-machine commerce where autonomous agents transact continuously.

Developer-friendly primitives

Tempo provides native primitives for metered billing (access keys with spending limits), streaming payments (MPP Sessions), and programmable payment logic (smart contracts). Developers integrate billing directly into their application logic rather than bolting on a separate payment provider.

Why Tempo for microtransactions

Tempo is designed for the high-volume, low-value payment patterns that microtransactions require:

• Sub-cent fees in stablecoins. Transaction fees are fractions of a penny, paid in stablecoins. No volatile gas tokens required. Learn more.
• Sub-second finality. Transactions settle in under one second with deterministic confirmation. Critical for real-time metered billing.
• Programmable access keys. Access keys with periodic spending limits enable metered and subscription billing onchain without re-prompting users.
• MPP Sessions for streaming payments. MPP Sessions collapse unlimited micropayments into two onchain transactions, scaling to machine speed for AI agent and IoT use cases.
• No account rent. Provisioning wallets for millions of users or devices incurs no per-account fees on Tempo. This matters when wallet provisioning is a prerequisite for receiving microtransactions at scale.

For developers and product teams, this means a payment network where billing logic, settlement, and reconciliation are native primitives, not external services bolted on after the fact.

Next steps

• Read about MPP Sessions for machine-to-machine payments
• Learn how subscriptions on Tempo work with access keys
• Explore stablecoin payments end-to-end
• Compare payment rails side by side
• Contact our team to discuss your microtransaction use case

Frequently asked questions