x402engine — Pay-per-call APIs for AI Agents

What it does

108 production APIs behind HTTP 402 micropayments. 72 LLMs, Kling V3 and Hailuo video generation, image generation, code execution, travel search, web scraping, TTS, and transaction simulation. Pay with USDC on Base, USDm on MegaETH, or USDC on Solana.

Audience: ai-agents, developers. Tags: tts, x402engine, pay-per-call, apis.

Pricing

How agents pay

1. The agent sends a plain request and receives an HTTP 402 response describing the price and payment requirements.
2. The agent signs a payment payload for the exact amount on base and attaches it to a retried request.
3. The facilitator verifies and settles the payment, then the service returns the paid response.

Related services

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Facet hubs for this service

• Chain: Base services
• Facilitator: Coinbase profile
• Price band: Micro ($0.01 or less per request)

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