Kaspa x402

Browser Test Client

Testnet-only browser client for inspecting Kaspa x402 offers, checking public-node connectivity, and rehearsing exact or Alpha.10 batch payment headers. The hosted gateway at demo.kaspa-x402.org is the paid-canary-proven Alpha.10 Testnet-10 deployment; see the gateway reference for deployed evidence.

Safety Boundary

Runtime Status

Public HTTPS pages must use the listed wss:// endpoints. Local custom endpoints require a local preview opened with ?allow-custom-endpoints=1&endpoint=...; the field must match that local or private-network endpoint.

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Testnet Key

Import only throwaway testnet keys. Do not import a key that controls mainnet funds; the same private key can derive addresses on multiple Kaspa networks.

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x402 Offer Builder

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Mock Payment Retry

Use this to rehearse the selected 402 retry envelope. Exact uses a schema-only request authorization. Batch uses a schema-only voucher signature and shows the current lane plus a partial-claim successor. These placeholders are not valid settlement evidence.

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Offer Compatibility Debug

Paste a PaymentRequired JSON object to see which entries are supported by this Kaspa binding and which entries a client would skip during selection.

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Developer Notes