Python reader for the pay.json standard — machine-readable pricing for AI agents.
Project description
pay-json (Python)
Python reader for the pay.json
standard. Fetches a site's /.well-known/pay.json, validates structure,
and resolves the price rule for a given URL path.
Install
pip install pay-json
Usage
from pay_json import PayJson
# Fetch and parse a host's pay.json
doc = PayJson.fetch("example.com")
# Resolve a rule for a given path
rule = doc.match_rule("/api/inference/foo")
if rule:
print(rule.price_usd) # Decimal("0.01")
print(rule.terms) # {"type": "per_unit", "unit": "1000_tokens"}
Supports both v1.0 and v1.1 of the pay.json spec. v1.1 adds optional
per-rule terms and budget_hints fields.
License
MIT. See the spec for the (CC-BY-4.0) specification text itself.
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