# Sandbox Contractor Agent (A2A)

**Canonical:** https://apis.io/apis/elonsusk-com/sandbox-contractor-agent-a2a/  
**Provider:** Artem / A2A Sandbox — https://apis.io/providers/elonsusk-com/  
**Base URL:** https://a2a.elonsusk.com/a2a  
**Documentation:** https://a2a.elonsusk.com/

Sandbox Contractor Agent (A2A) is one of 2 APIs that [Artem / A2A Sandbox](https://apis.io/providers/elonsusk-com/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include A2A, Agent-Native, x402, and Agentic Commerce. The published artifact set on APIs.io includes API documentation.

Agent2Agent protocol surface: an agent card served from https://a2a.elonsusk.com/.well-known/agent-card.json (and the legacy /.well-known/agent.json) declaring protocolVersion "1.0", JSONRPC transport, version 0.1.0, provider "Artem / A2A Sandbox", 28 skills each carrying inputModes, outputModes, tags, an example and — for the 24 keyless skills — a priceUsd from $0.001 to $0.02. The JSON-RPC 2.0 endpoint at https://a2a.elonsusk.com/a2a implements tasks/send, tasks/get and tasks/cancel (plus message/send and the SendMessage/GetTask/CancelTask aliases per the card's transports block); it answers a live probe with a JSON-RPC error for an unknown task id and -32601 for an unknown method. Streaming and push notifications are declared unsupported; stateTransitionHistory is supported and a nine-state task state machine is published in the card. No securitySchemes: the gate is payment (x402 pay-per-call or a crypto invoice whose memo is the task id).

## Machine-readable artifacts (3)

- **AgentCard** — https://raw.githubusercontent.com/api-evangelist/elonsusk-com/refs/heads/main/a2a/elonsusk-com-a2a.yml
- **AgentCard** — https://a2a.elonsusk.com/.well-known/agent-card.json
- **Documentation** — https://a2a.elonsusk.com/

## Other Artem / A2A Sandbox APIs (1)

- [Sandbox Contractor Agent REST API](https://apis.io/apis/elonsusk-com/sandbox-contractor-agent-rest-api/)

## Tags

A2A, Agent-Native, x402, Agentic Commerce

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/elonsusk-com/sandbox-contractor-agent-a2a/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/elonsusk-com/.