# GPT55 Model Gateway A2A Agent

**Canonical:** https://apis.io/apis/558686-xyz/gpt55-a2a-agent/  
**Provider:** gpt55-token-gateway — https://apis.io/providers/558686-xyz/  
**Base URL:** https://gpt55.558686.xyz/a2a  
**Documentation:** https://gpt55.558686.xyz/llms.txt

GPT55 Model Gateway A2A Agent is one of 5 APIs that [gpt55-token-gateway](https://apis.io/providers/558686-xyz/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include A2A, x402, and AI Agents.

Agent2Agent surface: an agent card served at https://gpt55.558686.xyz/.well-known/agent-card.json (and identically at the legacy /.well-known/agent.json) - name "GPT55 Model Gateway", version 1.0.0, protocolVersion "1.0", preferredTransport JSONRPC, url https://gpt55.558686.xyz/a2a, provider {gpt55-token-gateway, https://gpt55.558686.xyz}, capabilities {streaming false, tools true, paid true}, five skills (chat completions, translate, x402 buyer shortlist, wallet signing safety pack, x402 MCP integration kit), each priced in USDC, authentication [{schemes: [x402]}]. POST https://gpt55.558686.xyz/a2a answers JSON-RPC 2.0 (-32601 for an unknown method); message/send was not exercised because every skill is paid. Listed on a2aregistry.org under author gpt55-token-gateway, which is where this record was harvested from.

## Machine-readable artifacts (2)

- **AgentCard** — https://raw.githubusercontent.com/api-evangelist/558686-xyz/refs/heads/main/a2a/558686-xyz-a2a.yml
- **AgentCard** — https://gpt55.558686.xyz/.well-known/agent-card.json

## Other gpt55-token-gateway APIs (4)

- [GPT55 Model Gateway API](https://apis.io/apis/558686-xyz/gpt55-model-gateway-api/)
- [GPT-5.5 Utility Tools for API.market](https://apis.io/apis/558686-xyz/gpt55-utility-tools-api-market/)
- [GPT55 x402 Gateway MCP Server](https://apis.io/apis/558686-xyz/gpt55-mcp-server/)
- [Sub2API OpenAI-compatible API](https://apis.io/apis/558686-xyz/sub2api-openai-compatible-api/)

## Tags

A2A, x402, AI Agents

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/558686-xyz/gpt55-a2a-agent/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/558686-xyz/.