Add payment evidence
to your existing agent.

import { createCommerceClient, MockCommerceExecutor, apiPurchasePolicy } from '@onchaindiligence/sdk/commerce'
import { NodeFileRecoveryStore } from '@onchaindiligence/sdk/commerce/node'

const ocd = createCommerceClient({ recovery: new NodeFileRecoveryStore('./ocd-recovery') })
const { policy } = apiPurchasePolicy({ maxAmount: '1.00', allowedNetwork: 'eip155:8453', allowedAsset: BASE_USDC })
const op = await ocd.open({ action: proposedPayment, policy })

const evaluation = await op.preflight() // OCD evaluates against your policy
if (evaluation.kind === 'blocked' || evaluation.kind === 'approval-required') return handleThat(evaluation)

const execution = await op.execute({ executor: myExecutor }) // your executor authorizes + submits, e.g. X402BaseUsdcExecutor
const result = await op.observeAndFinalize() // OCD observes what actually happened -- safe to retry while pending
result.receipt.receipt.execution.status // read the fact, never infer "success" from existence

"Inspect a $0.001 USDC payment on Base against a $1 maximum."
"Retrieve OCD receipt OCD-RCP-NB51-QG4S-VCAN-Y57F."
"Verify that receipt and tell me what it does and doesn't prove."

// Configure your MCP client with this public endpoint.
const client = await connectMcp('https://mcp.onchaindiligence.com/mcp')
const { tools } = await client.listTools()

const unpaid = await client.callTool({
  name: 'screen_wallet',
  arguments: { address: '0x0000000000000000000000000000000000000000' }
})
const requirement = unpaid.structuredContent.accepts[0] // amount, asset, Base, recipient

// Only after your agent's policy approves the server-supplied requirement:
const payment = await createPaymentHeader(agentWallet, 1, requirement)
const result = await client.callTool({ name: 'screen_wallet', arguments: { address }, _meta: { 'x402/payment': payment } })

import { trustPolicyFromKeyRegistry, verifyBundle } from '@onchaindiligence/agent-evidence'

// Fetching is the caller's job -- the SDK stays offline-usable.
const registry = await fetch('https://issuer.example/.well-known/agent-evidence-keys').then(r => r.json())
const policy = trustPolicyFromKeyRegistry(registry, { expectedIssuer: 'issuer', expectedEnvironment: 'production' })
const report = verifyBundle(bundle, policy)
report.state // VALID | INVALID | UNVERIFIABLE