The AI Crypto Glossary: 40 Terms From Alpha Tokens to x402

AI crypto terms come from three fields at once: machine learning, blockchain plumbing and token economics. This glossary defines 40 of them in a sentence or two each, from Bittensor's alpha tokens to x402, the web-payment standard that lets AI agents pay for data. Where a term affects your risk as a holder, the definition says how.

Key takeaways

• Since February 2025, each Bittensor subnet has its own alpha token, priced against TAO in its own pool.
• Circulating supply, FDV, cliffs and vesting tell you how much selling could still come.
• The agent standards are young: MCP dates from November 2024, x402 from May 2025 and AP2 from September 2025, and ERC-8004 was still a draft in mid-October 2026.
• A term in a pitch deck isn't evidence; check it against the docs and on-chain data.

What do Bittensor's terms mean?

Bittensor's February 2025 upgrade, Dynamic TAO, added most of these words. Our Bittensor guide covers the network itself.

• Alpha token: a subnet's own token, traded against TAO in that subnet's pool and capped at 21 million.
• dTAO (Dynamic TAO): the upgrade that gave each subnet an alpha token and a pool, and tied its share of new TAO to a moving average of its alpha price.
• Emissions: new tokens a network creates as rewards. A Bittensor subnet's default split is 18% to its owner, 41% to miners and 41% to validators and their stakers.
• Halving: a cut in the emission rate by half. Bittensor's first, in December 2025, took issuance from 1 TAO to 0.5 TAO per 12-second block, about 3,600 TAO a day. Later ones trigger at issuance thresholds, not dates.
• Miner: a participant that produces what its subnet asks for, such as inference or predictions, and is paid according to validators' scores.
• Root network: subnet 0, with no miners and no alpha token. TAO staked there counts toward a validator's weight on every subnet.
• Staking: committing tokens to a validator for rewards. Staking TAO into a subnet swaps it into alpha at the pool price, so its value in TAO moves with alpha.
• Subnet: an independent incentive market inside Bittensor, identified by a number (its netuid), with its own owner, miners, validators and pool.
• Validator: a participant with enough stake to score miners. Yuma Consensus combines those scores, weighted by stake, into each participant's share of emissions.

Which supply terms tell you about dilution?

These decide how many tokens can reach the market, and when; our FDV explainer covers the most misread one.

• Burn: permanently removing tokens, usually by sending them to an address nobody controls. Burn-and-mint designs burn tokens when the network is used and mint new ones as rewards.
• Circulating supply: tokens that can trade now. CoinGecko arrives at it by deducting locked team, investor and foundation tokens from the total.
• Cliff: a date before which none of an allocation unlocks. At the cliff, a lump of tokens can unlock at once, which is why traders watch these dates.
• FDV (fully diluted valuation): the price times the maximum supply, or what the market cap would be if every possible token already circulated. Data sites don't all use the same supply figure, so compare like with like.
• Market cap: the price times the circulating supply.
• Max supply: the most tokens that can ever exist under a token's rules. TAO's is 21 million; some tokens have no cap.
• Unlock: the moment locked tokens, often the team's or early investors', become free to sell.
• Vesting: the schedule that releases locked tokens, usually after a cliff. Linear vesting releases a little each day or month instead of all at once.

Which trading and safety terms matter most?

• Audit: an outside security review of one version of a project's code. It covers only what was in scope and doesn't prove the code is safe.
• Liquidity: how easily you can trade without moving the price. Thin liquidity is why small tokens fall hardest in selloffs.
• Liquidity pool: a smart contract holding two tokens that traders swap against, priced by the ratio between them. Bittensor prices every alpha this way.
• Oracle: a service that brings outside data, such as prices, onto a blockchain. A wrong or manipulated price feed can break the protocols that rely on it.
• Prompt injection: input that changes an AI model's behavior in ways its owner didn't intend, in OWASP's definition. A malicious web page can try to make a wallet-holding agent send funds.
• Slippage: the gap between the price you expect and the price you get. It grows with order size and shrinks with liquidity.
• Smart contract: a program stored on a blockchain that runs exactly as written. Tokens, pools and vesting schedules are smart contracts.
• Token approval: permission for a smart contract to move a set amount of a token from your wallet, sometimes an unlimited amount, until you revoke it.
• Wash trading: trades that create the appearance of buying and selling without real market risk, as the CFTC's glossary defines it. Our wash-trading guide shows how it inflates volume.

What do the AI and agent terms mean?

• Agent token: a token tied to a specific AI agent or agent platform. What it gives holders, if anything, varies by project.
• AI agent: software that uses an AI model to pursue a goal on its own, taking actions such as browsing, calling tools or sending transactions.
• AI token: a token whose project's main business is AI: compute, data, models, agents or the infrastructure around them.
• DeFAI: AI agents or interfaces that carry out DeFi actions, such as swaps or lending, for a user. See our DeFAI explainer.
• Decentralized training: training one AI model across many independently owned machines that coordinate over the internet, usually for token rewards.
• DePIN: decentralized physical infrastructure networks, which pay tokens to people who supply hardware such as GPUs, storage or wireless coverage.
• Inference: running a trained model to produce an output, such as an answer, an image or a prediction.
• Proof of personhood: proof that an account belongs to one unique human. World ID, from the project behind WLD, says it lets people prove this without sharing personal information.
• TEE (trusted execution environment): a sealed area of a processor that shields code and data even from the machine's operator. ERC-8004 lists TEE-based checks as one way to verify an agent's work.

What are MCP, AP2, ERC-8004 and x402?

• AP2 (Agent Payments Protocol): an open protocol Google announced on September 16, 2025, for payments AI agents start, by card, bank transfer or stablecoin. Its "mandates," signed records of a user's instructions, set what an agent may buy.
• ERC-8004 ("Trustless Agents"): a proposed Ethereum standard from August 2025 that gives AI agents an on-chain identity plus registries for reputation and for validating their work.
• MCP (Model Context Protocol): an open standard Anthropic introduced in November 2024 for connecting AI assistants to tools and data, such as files and business apps.
• Stablecoin: a token designed to hold a steady value, usually one U.S. dollar. The x402 project calls stablecoin payments its primary use case.
• x402: an open standard Coinbase introduced in May 2025. It revives the web's HTTP 402 "Payment Required" code so that a client, including an AI agent, can pay for a request in stablecoins.

What the AI Score shows

Several of these terms sit behind the AI Score. It rates every AI token we track from 0 to 100, every 30 minutes, from public market data (CoinGecko) and public code activity, across five questions: Is anyone building it? Can I get in and out? Will unlocks dilute me? How badly could this hurt? Is the market agreeing? Development counts most and momentum least. It doesn't measure usage, fees or revenue; check those in a project's own data.

Check any token's AI Score on AiTokens.app before you decide.

Frequently Asked Questions

What is the difference between market cap and FDV? Market cap multiplies the price by the tokens circulating today; FDV multiplies it by the maximum supply. The gap is supply that hasn't reached the market yet.

What is an alpha token on Bittensor? A subnet's own token, introduced in February 2025. Staking TAO into a subnet swaps it into that alpha at the pool price, so its TAO value can rise or fall.

What is x402 used for? Charging per request: the server answers a request with HTTP 402 and a price, and the client, often an AI agent, pays in stablecoins and retries.

Is DeFAI the same as an AI agent token? No. DeFAI is an activity, agents carrying out DeFi actions; an agent token is an asset tied to an agent or platform. One doesn't require the other.

Sources

• Bittensor: Network concepts, documentation accessed October 16, 2026
• Bittensor: Emissions, documentation accessed October 16, 2026
• CoinGecko: Methodology, accessed October 16, 2026
• CFTC: CFTC Glossary, accessed October 16, 2026
• Google Cloud: Powering AI commerce with the new Agent Payments Protocol (AP2), September 16, 2025
• Anthropic: Introducing the Model Context Protocol, November 25, 2024
• Cointelegraph: Coinbase x402 payments protocol to make AI agents more autonomous, May 7, 2025
• Ethereum Improvement Proposals: ERC-8004: Trustless Agents, created August 13, 2025

This article is for educational purposes and is not financial advice.