FractalAI is the first AI-native Layer 1 blockchain built from scratch in Rust. It features post-quantum cryptography (CRYSTALS-Dilithium), Proof of Fractal Work consensus, WASM smart contracts, and 460+ RPC endpoints.

What is the FRAC token?

FRAC is the native utility token of the FractalAI blockchain with a fixed supply of 1 billion tokens. It is used for staking, governance, gas fees, and DeFi. FRAC is purely deflationary with a 61.8% fee burn rate based on the golden ratio.

How does Proof of Fractal Work differ from Proof of Work?

Proof of Fractal Work (PoFW) requires validators to perform fractal analysis instead of hash puzzles. Validators whose fractal dimensions approach the golden ratio (φ = 1.618) receive higher rewards, making it computationally meaningful rather than wasteful.

Is FractalAI quantum-resistant?

Yes. FractalAI uses CRYSTALS-Dilithium for digital signatures and Kyber for encryption, both NIST-approved post-quantum cryptographic algorithms that protect against quantum computing threats.

How can I buy FRAC tokens?

FRAC tokens are available through the presale at fractalai.net.co/presale. You can pay with USDC on Base, USDC on Stellar (lowest fees), or credit/debit card via Circle. The presale has 4 phases starting at $0.25 (Seed) up to $0.80 (Public), with listing target at $1.00.

What is the AURUM protocol?

AURUM is FractalAI's commodity tokenization protocol that enables gold, silver, platinum, and 5 other commodities to be tokenized on-chain with phi-bonding curves that grow at 1.618% per epoch.

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#pay per api call#stablecoin api payment#usdc micropayment

Pay per API call with stablecoin — no account, no key

Metered APIs almost always require an account and an API key before the first request. That friction makes sense for long-term human customers but is a dead end for one-off callers and autonomous software: a caller that needs a single response should be able to pay for exactly that, in a stablecoin, with no signup. Settling per call with USDC over an HTTP 402 challenge makes truly account-free API commerce possible.

The account is the friction

Signup, email verification, card entry, key management and quota tracking exist to bill a recurring relationship. For a caller that wants one answer, all of that is pure overhead — and for an autonomous agent it is a blocker, because there is no human to complete the form. Charging per request in stablecoin collapses the relationship to a single transaction: the caller pays for the response it wants and nothing else, and the provider never has to onboard or store credentials for a one-time user.

How settlement works per call

On the first request the server answers HTTP 402 with a price and payment details. The caller pays the amount in USDC on-chain, then retries with proof; the server verifies the payment and returns the result. Because USDC settlement is final and non-custodial, the provider is paid without holding a card or an account, and the caller spends without trusting the provider with recurring billing details. It is genuinely usage-based: no minimums, no subscription, no key to leak.

Honest scope

Pay-per-call handles metering and settlement; you still design authorization, abuse limits and the actual service quality. On-chain stablecoin payment is final — there is no chargeback — which removes fraud risk for the provider but means the caller relies on the service to deliver, so pairing payment with a verifiable deliverable (such as a signed proof) is prudent. Non-custodial means neither side holds the other funds; it is not an escrow or a refund mechanism.

Try it yourself — live, free, verifiable in 30 seconds:

Get paid per call with x402 →