fix: x402 verifier TLS and facilitator compatibility#322
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fix: x402 verifier TLS and facilitator compatibility#322
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Two fixes validated with real Base Sepolia x402 payments between two DGX Spark nodes running Nemotron 120B inference. 1. **CA certificate bundle**: The x402-verifier runs in a distroless container with no CA store. TLS verification of the public facilitator (facilitator.x402.rs) fails with "x509: certificate signed by unknown authority". Fix: `obol sell pricing` now reads the host CA bundle and patches it into the `ca-certificates` ConfigMap mounted by the verifier. 2. **Missing Description field**: The facilitator rejects verify requests that lack a `description` field in PaymentRequirement with "invalid_format". Fix: populate Description from the route pattern when building the payment requirement. ## Validated testnet flow ### Alice (seller) ``` obolup.sh # bootstrap dependencies obol stack init && obol stack up obol model setup custom --name nemotron-120b \ --endpoint http://host.k3d.internal:8000/v1 \ --model "nvidia/NVIDIA-Nemotron-3-Super-120B-A12B-NVFP4" obol sell pricing --wallet 0xC0De...97E --chain base-sepolia obol sell http nemotron \ --wallet 0xC0De...97E --chain base-sepolia \ --per-request 0.001 --namespace llm \ --upstream litellm --port 4000 \ --health-path /health/readiness \ --register --register-name "Nemotron 120B on DGX Spark" obol tunnel restart ``` ### Bob (buyer) ``` # 1. Discover curl $TUNNEL/.well-known/agent-registration.json # → name: "Nemotron 120B on DGX Spark", x402Support: true # 2. Probe curl -X POST $TUNNEL/services/nemotron/v1/chat/completions # → 402: payTo=0xC0De...97E, amount=1000, network=base-sepolia # 3. Sign EIP-712 TransferWithAuthorization + pay python3 bob_buy.py # → 200: "The meaning of life is to discover and pursue purpose" ``` ### On-chain receipts (Base Sepolia) | Tx | Description | |----|-------------| | 0xd769953b...c231ec0 | x402 settlement: Bob→Alice 0.001 USDC via ERC-3009 | Balance change: Alice +0.001 USDC, Bob -0.001 USDC. Facilitator: https://facilitator.x402.rs (real public settlement).
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Collapsed into #324 which is a superset of this PR (includes CA bundle, facilitator URL, and LiteLLM zero-downtime). |
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Summary
obol sell pricingnow populates theca-certificatesConfigMap from the host's cert bundle so the distroless verifier can TLS-verify external facilitatorsdescriptionin PaymentRequirementValidated: two-stack Base Sepolia testnet flow
Two independent DGX Spark nodes (ARM64), each running their own obol stack with Nemotron 120B (120B params, tensor-parallel across 2 GPUs):
Alice (spark-1, seller)
Bob (spark-2, buyer)
Path 1 — Direct x402 payment:
Path 2 —
paid/*through buyer sidecar (full LiteLLM supply chain):On-chain receipts (Base Sepolia)
0xd769953b...0xd004b8cd...paid/*Balance changes
0xC0De...97E0x57b0...490ETest plan
go test ./internal/x402/...passespaid/*path)