k402 — HTTP 402 payments on Kaspa and Bitcoin-family UTXO chains. Protocol library: client, server middleware, and PNN-backed verification. No accounts, no API keys.
MCP server for the k402 agent-payable API catalog on Kaspa — text tools, chain data, GPU inference, covenants, and zk attestation, paid per call in KAS with no account or API key
Anthropic, PBC
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Bloomberg
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Meta
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Microsoft
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