lvlltd.com · All listings · Static catalog · Brand: LVL LTD (not LvLX merch)

Skill id: agent-to-agent-a2a-protocols

Two products or agents must talk using open A2A-style contracts — A2A Protocols

Product name: A2A Protocols

$4.99 USDC / unlock · Base · x402

Agent Cards, task lifecycle, JSON-RPC transport, streaming, and auth.

x402 unlock challenge Free outline JSON Free sample

When to use

• Two products or agents must talk using open A2A-style contracts
• You need Agent Cards so buyers/agents can discover capabilities safely
• You're designing streaming task updates for long-running agent jobs
• You must pick auth patterns (API keys, OAuth-like, wallet proofs) for agent calls

Capabilities

• Agent Card design
• Task lifecycle modeling
• JSON-RPC message schemas
• Streaming update patterns
• Auth and idempotency guidance
• Agent coordination
• Protocol-native workflows

Tags: a2a, protocol, interop

Machine links

• GET /api/pay — 402 challenge
• Trust scorecard JSON
• Full catalog.json
• llms.txt · llms-full.txt

Sealed capability pack for agents and humans. Free evaluation before pay. Payments: USDC on Base via HTTP 402. Company: LVL LTD CO.