A2A Peptides

A2A Peptides — the first agentic commerce hub for peptides in 35 countries

Agent-to-Agent (A2A) + Model Context Protocol (MCP) hub for peptides.

The Agent-to-Agent (A2A) surface for peptides, served over the Model Context Protocol (MCP) — the record, a registry for security, and x402 to pay on it. AI agents for authorized trading partners. Not marketing. Not advertising. Operated by A2A Peptides Corp., built and run by GreenCore Solutions Corp. (GSC).

• Six frontier AI labs in the build — Anthropic, OpenAI, Google, Perplexity, xAI, Mistral — 10K agent requests a day.
• 5,301 peptide products.
• 24,694 licensed peptide providers.
• 35 countries — runs on Cloudflare, Amazon, Microsoft and Google hyperscalers.
• First agentic commerce hub for peptides on the Model Context Protocol (MCP) registry.

Connect: https://mcp.a2a-peptides.ai/mcp — streamable-HTTP, no adapter. Hub: https://a2a-peptides.ai/ · llms.txt · Agent Card

Connect kit

Agent-to-Agent (A2A) + Model Context Protocol (MCP) hub for peptides. AI agents for authorized trading partners. Not marketing. Not advertising. Operated by A2A Peptides Corp., built and run by GreenCore Solutions Corp. (GSC).

Product facts on this hub are served live from gtinfetch.ai, the GTIN resolver for AI agents; every answer carries its source page, date read and gtinfetch’s signature. Paid resolves at x402.gtinfetch.ai. | A2A endpoint | https:// /a2a on every agent — A2A 0.3.0 JSON-RPC, message/send and tasks/get; the preferred interface on every card | | Agent Card | https://a2a-peptides.ai/.well-known/agent-card.json — signed ES256, kid a2ap-2026-09 | | Keyring | https://a2a-peptides.ai/.well-known/jwks.json | | Issuer | https://peptides-registry.ai/.well-known/oauth-authorization-server — client-credentials Bearer for the transacting skills; reads need none | | Auditor Port | https://audit.a2a-peptides.ai/packs/index.json — the public index of sealed review packs | | Registry | namespace io.github.A2A-Peptides (the registry grants the GitHub login case), server a2a-peptides — server.json | | Family | hub · peptides-registry.ai (registry) · peptides-x402.ai (payments door) · a2a-pharma.ai (pharma gate) · peptides-usa.ai (first tenant) |

Agents (A2A)

Every agent lives at its own hostname and answers two addresses: https:// /.well-known/agent-card.json (the signed card) and https:// /a2a (A2A 0.3.0 JSON-RPC: message/send, tasks/get). There is no inference behind the endpoint. A DataPart {"skill": ..., "params": {...}} runs the gate chain on the door — resolve_jurisdiction → resolve_actor → gate_transaction — and then the skill; the artifact carries the result, the notice, the resolved jurisdiction and the rule-set version. A plain text part gets the deterministic skill list with each input schema. A text part whose text is a JSON object with a skill key is read as the same {skill, params} request, so text-only clients can send structured requests too. Transacting skills take the issuer's Bearer; without it the answer is DENY_UNLICENSED_AGENT.

111 agents live, 36 product-line slots reserved on the tenant table; by region: South Central US 97 · West US 2 14. Counted from the hub's list_agents on 2026-09-19; door version 1.6.7, 20 tools.

Human-readable text on every card says UK; the machine field carries the ISO code. A country agent's hostname is the country code in lower case (the United Kingdom is uk, Germany is de, and the European Union level is eu) before .a2a-peptides.ai.

The gate

Three calls come before any price, availability, order or handoff: resolve_jurisdiction → resolve_actor → gate_transaction. The gate returns allow, deny or require_rx with a frozen reason code and the version of the rule set it read; both travel on every downstream receipt, including x402 settlement receipts.

Jurisdictions: United States · Canada · Mexico · European Union (member as parameter) · UK · Korea · Japan · Singapore · Switzerland. Actors: authorized trading partner and its members (manufacturer, repackager, wholesale distributor, dispenser, third-party logistics provider; cosmetic responsible person and natural-health-product licence holder on the non-drug pathways) · prescriber · patient and public (referral classes) · agent (inherits the class of the credential it presents; none returns DENY_UNLICENSED_AGENT).

The twenty tools

Auditor Port

audit.a2a-peptides.ai is prepared for independent review: a read-only agent with seven skills (list_agents, get_pack_index, get_pack, verify_receipt, get_rule_set_versions, get_azure_posture, get_audit_log) and no transacting skill. Review packs are sealed with a signed manifest (SHA-256 per file, a pack hash) and listed on a public index; a pack is never overwritten, later packs sit beside the old. Pack contents and the audit log take an auditor credential; auditor credentials are issued by the operator only, time-boxed, and every call made with one is written to the audit log. The port is review-ready as served; it makes no claim beyond what is on the wire.

The first tenant

The first tenant, peptides-usa.ai, has its agents on the wire today — a concierge, fifty-four state and territory agents, nine jurisdiction desks — and they answer every read and gate skill. Order intake for the tenant opens when a sourced licence is on the record; until then create_order_intent scoped to the tenant answers DENY_EXPIRED_LICENCE together with the licensed-destination referral.

Connect

Any client that speaks streamable-HTTP MCP connects with the URL alone:

{ "url": "https://mcp.a2a-peptides.ai/mcp", "transport": "streamable-http" }

Stock client paths, no adapter — see examples/:

• examples/generic_mcp_client.py — the reference MCP Python client
• examples/aws_strands.py — Strands Agents MCPClient
• examples/azure_semantic_kernel.py — Semantic Kernel MCPStreamableHttpPlugin
• examples/google_genai.py — google-genai with the door's tools as function declarations
• examples/a2a_google_sdk.py — a2a-sdk against a country agent: card, signature, one read, the refusal
• examples/a2a_aws_strands.py — Strands Agents A2AClientToolProvider, the same exchange
• examples/a2a_azure_agent_framework.py — Microsoft Agent Framework A2AAgent, the same exchange

Sample cards as served on the day of the cut: agent-card.sample.json (hub), agent-card.country.sample.json (one country agent), agent-card.audit.sample.json (the Auditor Port). Always read the live card; it is signed and the signature verifies against the live keyring.

Credentials and settlement

Reads need no authentication. An agent that transacts presents a credential issued to a licensed party by the issuer at peptides-registry.ai. Registry-truth tools are metered by x402; create_order_intent settles by x402 (USDC on Base); receipts are signed and carry reason_code and rule_set_version.

Contact

Registry contact for every listing this hub files: mcp@a2a-peptides.ai. Human door: the form at https://a2a-peptides.ai/#contact.

MIT licence — see LICENSE.