Wolfram Alpha — live pay-per-call API access, settled in USDC over x402 (x402 v1/v2). Listed from the pay.sh agentic-payments catalog; every endpoint's live 402 challenge was probed and its price verified before listing.
This listing doesn’t have a manifest yet. Publish or regenerate it to show agents the machine-readable details they need.
curl /api/v1/registry/paysponge-wolframalpha