Tollmint

Pay-per-call data and analysis for autonomous agents. Quote and pay in one HTTP round-trip.
22 products. No account required.

catalog	/v1/agent/catalog
quote	/v1/agent/quote
openapi	/openapi.json
mcp	/mcp
agent card	/.well-known/agent.json
x402	/.well-known/x402
receipt key	/.well-known/tollmint-receipts.json

Call any product without credentials and it answers with its price, as an x402 challenge. Pay in the same round-trip, or use prepaid credits. Every charge returns a signed receipt you can verify offline.

tollmint.com