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Use case

Agent spend controls for runtimes and orchestrators.

Paybond Kit provides integration primitives that make the invariants easier to keep than to break: tenant-scoped sessions, delegated spend authorization, tool-call budget checks, signed evidence submission, and clean handoffs into Harbor, the Ledger, and Signal.

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Integration primitives for production agent systems.

Kit keeps tenant, capability, and signing invariants intact while you integrate with the runtimes you already run.

  • Tenant-scoped sessions

    Keep tenant identity derived from authenticated credentials and carried end-to-end through SDK calls.

  • Spend checks in the workflow

    Authorize delegated spend and tool-call budget requests before agents execute paid APIs, vendor actions, or settlement work.

  • Signed evidence submission

    Attach signed artifacts to the intent lifecycle so evaluation, exports, and disputes all reference the same record.

  • Minimal integration surface

    Integrate with orchestrators and tool routers without replacing your runtime or reshaping your entire system, including x402 stablecoin funding when a tenant enables that rail.

How Kit fits into the workflow

From tenant-scoped session to evidence and settlement—without hand-rolled plumbing.

  1. Step 1

    Open a tenant session

    Create a tenant-scoped SDK session derived from authenticated credentials and runtime configuration.

  2. Step 2

    Check capabilities

    Verify which operations are allowed before invoking tools or delegating to sub-agents.

  3. Step 3

    Fund stablecoin intents

    When the tenant uses `x402_usdc_base`, advance Harbor's PAYMENT-REQUIRED and PAYMENT-SIGNATURE handshake to fund the intent in USDC on Base.

  4. Step 4

    Attach evidence

    Submit signed evidence artifacts as outputs are produced so provenance stays complete.

  5. Step 5

    Drive settlement

    Commit budgets and trigger evaluation via Harbor so release/refund decisions remain deterministic.

  6. Step 6

    Derive receipts

    Use ledger provenance and Signal receipts for downstream verification, compliance, and underwriting.

Integration should preserve the guarantees.

Kit’s role is to make tenant isolation, signing, and evidence capture the default behavior—so your orchestrator can scale without eroding the invariants that settlement depends on.

Guarantees

  • Tenant scope is derived from authenticated credentials—not browser-supplied identifiers.
  • Evidence artifacts are signed and attributable to operators/agents.
  • Capability checks keep delegation bounded and auditable.
  • SDK callers can request Stripe-backed or x402 rails without ever submitting raw settlement destinations.
Kit docs

Where it fits

Use Kit where your agents live: orchestrators, tool routers, and evidence pipelines.

  • Agent orchestrators

    Add settlement and evidence primitives without replacing the planning/execution engine you already use.

  • Tool routers and sandboxes

    Enforce capabilities and attach signed tool outputs as evidence for later verification.

  • Enterprise integrations

    Keep tenant boundaries explicit while connecting agent workflows to procurement, billing, and compliance controls.

Agent SDK integrations FAQ

Questions about runtimes, languages, and invariants.

Do I need to adopt a specific agent framework?

No. Kit is designed to integrate with orchestrators and runtimes you already use. It provides primitives for tenant context, capability checks, and evidence submission.

What languages are supported?

Kit focuses on practical SDK coverage for production stacks. See the Kit docs for current language support and reference implementations.

Can this flow use stablecoins?

Yes. Kit supports the `x402_usdc_base` rail. The intent amount remains USD-denominated while Harbor runs the x402 funding handshake and settles the funded value as USDC on Base.

Is tenant identity passed from the client?

No. Tenant scope should be derived from authenticated credentials and enforced at every boundary. The SDK is designed to keep that model intact.

How does this connect to Harbor, Ledger, and Signal?

Kit helps attach evidence and enforce capabilities while you drive settlement through Harbor. The Ledger records signed provenance; Signal derives receipts and rollups from that history.