Encounter Builder

Encounter builder / encounter difficulty calculator API for D&D 5e.

Overview

Encounter builder / encounter difficulty calculator API for D&D 5e. Give the party (levels, or size + level) to get easy/medium/hard/deadly XP thresholds; optionally give monster CRs to get the multiplier-adjusted XP and the resulting difficulty rating. SRD DMG tables (OGL 1.0a / CC-BY-4.0).

Endpoint

Method	Endpoint	Price	Description
POST	/v1/marketplace/api/encounter-builder	$0.00575	Invoke Encounter Builder (General) and return the upstream response.

How to call it

Requests are paid per call over the x402 protocol. Call the endpoint, receive a 402 Payment Required quote, then repeat the request with the signed payment header. The SDKs do both steps for you.

# 1. Ask for a quote
curl -i -X POST https://api.jarvisclaw.ai/v1/marketplace/api/encounter-builder \
  -H 'Content-Type: application/json' \
  -d '{}'

# 2. Pay it (the SDK signs and retries for you)
curl -X POST https://api.jarvisclaw.ai/v1/marketplace/api/encounter-builder \
  -H 'Content-Type: application/json' \
  -H 'X-PAYMENT: <signed-payload>' \
  -d '{}'

Open in the marketplace