feat(x402): attach BlockRun builder-code service code to payments#21
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VickyXAI merged 1 commit intoJul 8, 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 create_payment_payload, 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. Covers the EVM signing path. The Solana path delegates to the external x402 SDK and is tracked separately. 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 Python SDK are attributed to BlockRun on-chain.Reference: CDP Builder Codes
How
with_builder_code_service_code()mergess: ["blockrun"]into the payload'sbuilder-code.info, preserving any app code (a) the server echoes back in its 402 (so seller attribution is never clobbered).create_payment_payload, through which every EVM caller (client,anthropic_client,music,realface, …) already funnels.BLOCKRUN_SERVICE_CODEfor 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
blockrun_llm/x402.py).x402SDK (solana_client.py→x402_client.create_payment_payload); attributing it needs the x402 SDK's builder-code extension and is a separate follow-up.a) needs a registered code from dashboard.base.org (tracked separately).Test
tests/unit/test_x402.py: service code always attached; server-echoedapreserved.