feat(x402): attach BlockRun builder-code service code to payments#2
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VickyXAI merged 1 commit intoJul 5, 2026
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Tag every x402 payment this SDK signs with the ERC-8021 Schema 2 service code s: ["blockrun"] so BlockRun-originated traffic is attributed on-chain. Merged into builder-code.info.s inside CreatePaymentPayload, preserving any app code (a) the server echoes back in its 402. Encoding into settlement calldata is handled by the CDP facilitator; the client only sets the JSON field, so no new dependency is required. Docs: https://docs.cdp.coinbase.com/x402/core-concepts/builder-codes
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What
Tags every x402 payment this SDK signs with the ERC-8021 Schema 2 service code
s: ["blockrun"], so payments originated through BlockRun's Go SDK are attributed to BlockRun on-chain.Reference: CDP Builder Codes
How
withBuilderCodeServiceCode()mergess: ["blockrun"]into the payload'sbuilder-code.info, preserving any app code (a) the server echoes back in its 402.CreatePaymentPayload(x402.go), through which every caller (base_client,image,stream,video, …) already funnelspaymentReq.Extensions.BlockRunServiceCodefor reuse.Why this is all the client needs
The CBOR / ERC-8021 calldata encoding is done by the CDP facilitator at settlement (it reads
builder-code.info.sfrom the payload). The client only sets a JSON field — no new dependency, no CBOR, works unconditionally on every payment.Scope
Buyer-side. Consumers such as
blockrun-llm-go-vipinherit this automatically. Seller-side app code (a) needs a registered code from dashboard.base.org (tracked separately in BlockRunAI/blockrun#199).Test
x402_test.go: service code always attached; server-echoedapreserved.go test ./.green.