PayAI

PayAI is payments infrastructure for the era of agentic commerce — systems where AI agents coordinate and transact with one another without human involvement. Its central product is an implementation of the x402 payment protocol, which embeds USDC micropayments directly into standard HTTP requests, enabling machines to pay for and sell services programmatically at any scale, from fractions of a cent to a million dollars per transaction.

The x402 Protocol

The x402 protocol revives the HTTP 402 "Payment Required" status code — a response code defined in the original HTTP specification but historically unused. PayAI's implementation turns this dormant code into a live, machine-readable payment layer.

The flow works in four steps:

1. A client (an AI agent, an application, or any HTTP consumer) requests a resource.
2. The server responds with a 402 status and machine-readable payment terms: price, network, and accepted asset.
3. The client signs a USDC payment and submits it.
4. PayAI's Facilitator service verifies the payment on-chain and signals the server to deliver the resource.

Settlement completes in under a second. Payments are idempotent — the same payment cannot settle twice, preventing double-charges even if a request is retried. The entire flow is machine-readable, making it suitable for autonomous agents that cannot navigate checkout pages, fill forms, or generate API credentials.

Products

x402 Protocol — The foundational layer, open-source and hosted under the PayAI GitHub organization. Client SDKs are available in Go, Python, and TypeScript. Server integrations cover Express, FastAPI, Flask, Gin, Hono, and Next.js. Payments range from $0.01 to $1,000,000 per transaction through a single integration, with flat per-settlement fees rather than percentage-based pricing.

Facilitator — PayAI's hosted settlement backend at facilitator.payai.network. The Facilitator handles payment verification and settlement across all supported chains, abstracting away RPC node management, private key custody, and reconciliation for merchants. Merchants authenticate via Ed25519-signed JWTs. On Solana, PayAI sponsors gas fees, meaning buyers need only hold USDC to transact.

PayAI Bazaar — A discovery layer that catalogs services and APIs accepting x402 payments, their payment terms, and their schemas. It functions as a marketplace for pay-per-use services and agentic tooling, allowing agents to discover and interact with priced resources programmatically.

X402 Echo Merchant — A live demo environment for developers to validate the protocol and run micro-transactions before deploying to production.

Supported Networks

PayAI's Facilitator extends the x402 protocol across multiple chains: Solana, Base, Polygon, Avalanche, Arbitrum, Sei, X Layer, and SKALE, on both mainnet and testnets. Solana is the primary settlement layer for production use because of its throughput and low per-transaction costs — essential for sub-cent micropayments at scale.

Use Cases

The protocol addresses any scenario where machines need to pay or be paid without human mediation:

• AI agent-to-agent commerce: Autonomous agents hiring other agents for subtasks and paying immediately for results.
• Pay-per-request APIs: Developers charging per call rather than per month, accessible to any HTTP client without signup.
• Digital content gates: Unlocking articles, data feeds, or media with a single USDC payment.
• Usage-based SaaS billing: Per-unit pricing that scales with actual consumption without subscription overhead.

Token

The [[TOKEN:E7NgL19JbN8BhUDgWjkH8MtnbhJoaGaWJqosxZZepump]] token operates on Solana with a fixed supply of one billion tokens and no inflation schedule. At launch, the team acquired 20% of supply for the project treasury: half went to liquidity pools to generate trading fees, and the remaining half vests linearly over one year for partnerships, rewards, and development. The token launched fully liquid with no disclosed private presale rounds.

Token utilities include fee discounts on settlements, boosted visibility for agents and services within the PayAI Bazaar, governance participation, and planned dispute arbitration. The token underwent a contract migration in November 2025. The x402 protocol itself settles payments in USDC; $PAYAI is a separate project token.

Milestones and Partnerships

PayAI launched in early 2025. By the end of that year, the x402 protocol surpassed 15 million transactions. In February 2026, PayAI was listed on Indonesian exchange INDODAX. That same month, the project announced an integration with Mind Network, incorporating Fully Homomorphic Encryption (FHE) to enable confidential payments between agents — allowing payment values and agent identities to remain encrypted on-chain during settlement.

Coinbase's announcement of the x402 Foundation, developed alongside Cloudflare, provided independent validation of the HTTP 402 payment standard that PayAI implements. PayAI positions itself as the leading x402 facilitator on Solana, citing growing network transaction volume as evidence of adoption.

Team

The PayAI team operates pseudonymously. No venture funding or institutional backers have been publicly disclosed. The project is presented as open-source and community-driven, with code available on GitHub under the PayAINetwork organization.