skills.rest
key0aikey0aiOfficial·2 Agent Skills Included

key0

Payment-gated API access with on-chain USDC settlement

Adds payment gates to any API so buyers pay in USDC before receiving access credentials or responses. Handles on-chain verification, double-spend prevention, token issuance, and automatic refunds without manual billing work. Runs as embedded middleware or a standalone Docker gateway with discovery files generated automatically.
96|5
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npx skills add key0ai/key0 --all -g -y
Available:

Explains the payment gateway architecture, state machine, and security invariants so the agent edits payment-critical code safely and always runs the security reviewer after changes.

All Skills in This Repository (2)

Pure Emerald Level Indicators
📦 In Repo
key0aikey0ai

test-conventions

Enforce bun:test conventions for Key0 SDK test files.

Official
Intermediate
📦 In Repo
key0aikey0ai

payment-invariants

Detail five security invariants for Key0 payment flows.

Official
Advanced

Frequently Asked Questions

FAQPage Schema
How to install key0?▼

Run `npx skills add key0ai/key0 --all -g -y` in your terminal to install all skills in this repository globally.

How to charge for API access with crypto?▼

key0 lets you define paid plans or per-request routes, then verifies USDC payments on Base before issuing a token or returning the response.

Does key0 prevent double-spending of payments?▼

Yes. It uses atomic state transitions and a seen-transaction store so one on-chain payment can never unlock two resources.

Can I run key0 without changing my app code?▼

Yes. The standalone Docker mode proxies requests to your existing backend, so you only configure environment variables.

What happens if delivery fails after payment?▼

key0 detects paid-but-undelivered challenges and can automatically refund the payer on-chain.

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