Glossary

x402

An HTTP-native payment protocol built on 402 Payment Required. Clients pay for resources at request time — no API keys, no subscriptions.

Facilitator

The service that verifies payment payloads, sponsors transaction fees (on Solana), and settles transactions on-chain. Dexter's public facilitator lives at https://x402.dexter.cash.

OpenDexter

The public, no-auth x402 gateway for searching and paying for paid APIs. As a product name, it covers both the hosted MCP surface at open.dexter.cash/mcp and the local package/runtime story.

The local stdio package for the OpenDexter tool flow. Use it in local editor, CLI, or agent runtimes when you want a persistent local signer instead of a hosted session wallet. This is the package name a developer installs; it is not the same thing as OpenDexter the broader product surface.

`@dexterai/clawdexter`

The OpenClaw-native plugin for the same OpenDexter x402 discovery and payment flow. Use this when the runtime is OpenClaw specifically rather than a generic local MCP-capable environment.

Dexter MCP

The authenticated MCP server at mcp.dexter.cash/mcp with managed wallets and broader platform tooling. This is distinct from the hosted public OpenDexter MCP, which is narrower and no-auth.

`@dexterai/x402`

Dexter's SDK for integrating x402 payments into client and server applications. Includes Express middleware, browser and Node client helpers, React hooks, Access Pass, and pricing primitives.

`@dexterai/x402-ads-publisher`

Publisher middleware for Sponsored Access Model B. It makes sponsored recommendations visible in the response body via _x402_sponsored, instead of leaving them only in settlement metadata.

Merchant / Seller

A developer or operator exposing a paid endpoint through x402.

Resource

A paid endpoint or API that returns 402 Payment Required with x402 payment requirements. Discoverable through OpenDexter and represented as the thing the buyer actually pays to call.

Payment Requirements

The JSON returned with a 402 response that tells the client which chains, assets, and amounts are accepted. This is protocol/payment truth, not product marketing copy.

Settlement

Verifying, signing, and finalizing a payment transaction on-chain through the facilitator.

Verification

Dexter's AI quality evaluation that tests whether a resource actually works and delivers useful responses. Produces a 0-100 score and letter grade.

Access Pass

An SDK mode where the buyer pays once for a time window (for example 1h or 24h) instead of signing every request. This is part of @dexterai/x402, not a separate package.

CAIP-2

Chain Agnostic Identifier format for naming networks. Examples: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp (Solana mainnet), eip155:8453 (Base).

Dexter Lab

The AI-powered builder that creates, deploys, and publishes paid APIs from a chat interface at lab.dexter.cash.

ERC-8004

On-chain identity standard for resources. Lab-deployed APIs get an ERC-8004 identity on Solana or Base.