git:20260827.1133987 to git:20260828.84d6146

---

name: marketplace-invoke

description: Invoke one exact marketplace-listed vendor resource through an approved settlement adapter and return receipt-backed provider readback.

runx:

category: payments

---

# Marketplace Invoke

The caller supplies only the provider-neutral vendor request body and bounded

transport preferences. Paid-listing admission injects the immutable offer and

the run idempotency identity. The selected settlement adapter derives its own

protocol envelope, authority attenuation, endpoint, amount, and parent binding;

neither callers nor product facades may forge those fields.

`marketplace-invoke` is the buyer-facing marketplace skill called through the

existing `runx skill` surface. Paid listing

admission injects the immutable listing, vendor, exact endpoint, vendor price,

demand-side fee, settlement family, and expected receipt class into one Runx

run before its quote is fingerprinted. Hosted receipt custody verifies the

returned inner receipt and seals the outer execution as a mediated composite

receipt.

The skill is rail-neutral at its boundary. `settlement_family` selects an

explicit adapter branch; x402 is the first implementation. Stripe and future

rails add sibling branches while preserving the listing, vendor, authority,

result, and composite-receipt semantics. Provider SDKs, wallets, credentials,

settlement recovery, and database state remain in Runx Hosted.

## Composes

<!-- Generated from the native execution closure; run pnpm core-skills:composes:generate. -->

## Operator guide

Use this skill through a paid endpoint listing after marketplace discovery.

Supply the exact vendor invocation body and optional bounded transport limits.

`marketplace_offer` and `idempotency_seed` are reserved for hosted admission;

caller-supplied values are refused. Keep large inputs behind artifact references.