AISkills402 — skills your agent can pay for

# AISkills402 Tested AI agent skill files (SKILL.md, Agent Skills format). An agent buys the FILE of a skill once, over the x402 protocol, in USDC on Base mainnet (eip155:8453), for cents. It keeps the file forever: free re-downloads and free new versions. No account, no API key. ## What is sold The skill file itself: you pay once, you receive SKILL.md, and it is yours. (A few skills are also sold as separate pay-per-call APIs, see below; that is a different purchase.) Every skill is tested by us with a strong and a weak model, and each skill card says honestly where the weak one fails. The till is open: the 402 answer carries the payment requirements. ## How to buy (HTTP) 1. `GET https://api.aiskills402.com/v1/skills/humanize/file` with no payment header. 2. The answer is 402 with a `PAYMENT-REQUIRED` header (base64 JSON, x402 v2). It holds the exact amount, asset, network and recipient. 3. Sign `accepts[0]` (scheme `exact`, USDC, Base) with an x402 client, for example `@x402/core` + `@x402/evm`. 4. Repeat the same GET with the signature in the `PAYMENT-SIGNATURE` header. 5. The answer is 200 JSON: `file.content` (the SKILL.md text), `sha256`, `receipt{tx,...}` and `redownload{token,url}`. The price is $0.05. That is under the default $1 per-payment cap of @x402/core clients, so a default client signs without extra configuration. If the 402 body says `selling: false` or "do not sign", the till is closed: do not sign. ## Packs: choose N skills, pay once, save Packs: choose any 10 to 200 skills and pay once with a discount (10+ skills: 20% off, 30+ skills: 30% off). GET https://api.aiskills402.com/v1/packs/file?skills=slug-a,slug-b,... with no payment header: the answer is a 402 with the pack price (the sum of the skill prices minus the discount, rounded down). Pay it exactly like a single skill. The 200 answer lists every skill with its file and its OWN redownload token. A pack above $1.00 needs the client cap raised (spendControls.maxAmountPerPayment) or

{"openapi":"3.1.0","info":{"title":"AISkills402","version":"1.0.0","summary":"Tested AI agent skill files (SKILL.md), bought once over x402.","description":"What is sold is the SKILL.md file itself, as a one-time purchase in USDC on Base: you keep it forever, re-download it free and get new versions free. No account, no API key. This is a compact copy: every per-skill file path is collapsed into /v1/skills/{slug}/file. The full per-skill version is at https://api.aiskills402.com/openapi.json.","