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Go implementation of the x402 payment client, mirroring the TypeScript
and Python packages.
- EVMSigner + SignEVMPayment — EIP-3009 TransferWithAuthorization
signing for Base/SKALE (uses go-ethereum's apitypes.TypedData +
crypto.Sign with canonical V=27/28)
- SolanaSigner + SignSolanaPayment — SPL TransferChecked with optional
ComputeBudget instructions; signs, submits via JSON-RPC, and returns
the on-chain signature in the X-Payment envelope
- Handler — unified NewHandler(HandlerOptions{Network, EVMSigner,
SolanaSigner, RPCURL, HTTPClient}) factory with Sign / Headers
methods and network-based requirement selection
- PaymentRequirementFromMap — helper that adapts a raw 402 'accepts'
entry (map[string]any) into the typed struct
- Module: github.com/AceDataCloud/X402Client/go, Go 1.21+
Tests verify:
- EIP-712 signature recovery round-trip (signer address recoverable
from the canonical digest)
- Default USD Coin / v2 / chainId=8453 EIP-712 domain matches the
TypeScript and Python reference implementations
- Handler validation (missing signer, unsupported network)
- Solana ATA derivation determinism, TransferChecked data encoding,
ComputeBudget instruction shapes
- Requirement selection logic
Also ships a scripts/e2e binary that hits a real AceDataCloud endpoint
end-to-end using SKALE_BASE_PRIVATE_KEY.
CI: new go.yml workflow tests on Go 1.21 / 1.22 / 1.23 with race detector.
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Summary
Go implementation of
@acedatacloud/x402-client/acedatacloud-x402atgo/.What's in it
EVMSigner+SignEVMPayment— EIP-3009TransferWithAuthorizationsigning for Base / SKALE via go-ethereum'sapitypes.TypedData. Signature V is normalized to 27 / 28 to match the canonical Ethereum form expected by the facilitator'secrecover.SolanaSigner+SignSolanaPayment— SPLTransferCheckedwith optionalComputeBudgetinstructions; builds the instruction, signs with a local keypair, submits via JSON-RPC, and returns the on-chain signature in the X-Payment envelope.Handler— unifiedNewHandler(HandlerOptions{...})factory withSign(ctx, accepts) (string, error)andHeaders(ctx, accepts) (map[string]string, error). Validates inputs and selects the matching requirement by network.PaymentRequirementFromMap— adapts a raw 402acceptsentry (map[string]any) into the typed struct, so users can bridge it to any HTTP-client shape.Module
github.com/AceDataCloud/X402Client/go, Go 1.21+, tag-based releases.Depends on:
github.com/ethereum/go-ethereum(EIP-712 + ECDSA)github.com/gagliardetto/solana-go(pubkey / transaction types)github.com/mr-tron/base58(base58 enc/dec)Testing
ecrecoverreturns the signer's address.USD Coin / v2 / chainId=8453match the TypeScript and Python reference.TransferCheckeddata layout,ComputeBudgetdiscriminators.accepts, errors clearly when none match.Live E2E
scripts/e2eexercises the full 402 → sign → retry flow againstapi.acedata.cloudusingSKALE_BASE_PRIVATE_KEY:Integration with the AceDataCloud Go SDK
The Go SDK PR exposes a
PaymentHandlerinterface. The README shows the trivial 4-line bridge so users can drop anx402.Handlerintoacedatacloud.NewClient.CI
New
.github/workflows/go.ymlruns Go 1.21 / 1.22 / 1.23 matrix with race detector.