A2A Agent Card · Green Helix

A2A Commerce Gateway

Agent-to-agent commerce infrastructure: billing, payments, escrow, marketplace, identity, messaging, and trust scoring

Open the live agent card → Agent endpoint Green Helix provider profile
⚠ Agent card, not A2A. Green Helix serves a machine-readable agent manifest at the A2A discovery path, but it fails a structural check in the A2A 1.0.0 AgentCard object. It is an agent card in spirit rather than in schema — useful for discovery, but an A2A client cannot assume it will parse.
Provider: Green Helix Conformance: Flavored Protocol: Transport: Version: 1.4.10 Host: api.greenhelix.net Skills: 8
Discovery

An A2A client finds this agent by fetching the well-known path on the provider's own host. That is what makes an agent card different from every other agent artifact in this catalog: it is provider-published by construction — it cannot be derived, generated, or reconstructed on a provider's behalf.

https://api.greenhelix.net/.well-known/agent-card.json
Skills (8)

Billing & Wallets billing

Agent wallets, credit deposits/withdrawals, usage tracking, budget caps, volume discounts, currency exchange, and leaderboards

billingwalletcreditsusagebudgetcommerce

Payments & Escrow payments

Payment intents (authorize/capture), standard and performance-gated escrow, subscriptions, split payments, and refunds

paymentsescrowsubscriptionsrefundscommerce

Identity & Reputation identity

Ed25519 cryptographic agent identity, verifiable claims, metric commitments, organizations, and reputation scoring

identityreputationed25519verificationclaims

Service Marketplace marketplace

Service registration, discovery, matching, ratings, and strategy comparison

marketplacediscoveryratingsservices

Trust Scoring trust

Composite trust scores, SLA compliance checking, and server search

trustreputationslascoring

Agent Messaging messaging

End-to-end encrypted agent-to-agent messaging and price negotiation

messagingencryptionnegotiationcommunication

Dispute Resolution disputes

Dispute lifecycle management: open, respond, resolve, with 7-day response deadline

disputesresolutionarbitration

Infrastructure infrastructure

API key management, webhook registration with HMAC-signed delivery, event bus with schema registry, audit logging, and database operations

infrastructurewebhookseventsauditapi-keys
Documentation
Evidence. Fetched 2026-09-19 from https://api.greenhelix.net/.well-known/agent-card.json, HTTP 200. The body was saved verbatim and is the sole source for everything on this page — no field is inferred. View the captured card. Providers change what they serve; if this card has moved or changed shape, the provider profile carries the current state as of the last build.

Work with this as data

Every agent card here is available over the APIs.io API and to AI agents over MCP. A2A Agent Cards is not yet its own endpoint on the v1 API. Reach it through catalog search and the tag graph, or the MCP server.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for a2a agent cards

3 MCP tools reach this
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
Search the catalog 
curl "https://apis.io/api/v1/search?q=greenhelix-net&limit=10"
Everything under a tag 
curl "https://apis.io/api/v1/tags/greenhelix-net"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

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A second provider on the same verified email joins the account you already have.