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x402.agentutility.ai ability-check
https://x402.agentutility.ai/ability-check
payable
Resolves a d20 ability check, skill check, attack roll, or saving throw for tabletop RPGs. Rolls a d20 with an optional modifier and advantage/disadvantage, compares to a DC, and reports total, success/failure, and natural-20 / natural-1. Seedable. Use it as a d20 check resolver API for any RPG.
We sent a real
POST request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.005
- Network
- base
- Pay to
- 0x6c0752c09e7F6fA6526fCDf40e456a159ebB5621
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- POST
- Response latency
- 13 ms
- Payment options
- 2 usable of 2
- Last checked
- 2026-08-10T09:12:27.051Z (4d ago)
- Category
- ai-inference
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fx402.agentutility.ai%2Fability-check"