# Ambr

**Canonical:** https://apis.io/providers/getamber-dev/  
**Website:** https://ambr.run/  
**APIs profiled:** 3

Ambr (ambr.run; platform and API host getamber.dev) is the "Agent Mandate & Binding Registry" — an agent-native service that creates, signs, verifies and revokes Ricardian contracts for AI agents: delegation mandates recording who authorized an agent, in what scope and under which law, plus agent-to-agent commerce and agent-to-consumer agreements. Every contract is dual-format — legal prose and machine-parsable JSON bound by one SHA-256 hash (urn:ambr:ricardian-v1, MIT) — and once signed by both wallets is minted as an ERC-721 cNFT on Base L2. The surface is a JSON REST API at getamber.dev/api/v1 with a public pricing endpoint, a remote MCP server at /api/mcp (six tools, anonymous tools/list) and an A2A JSON-RPC endpoint discovered via /.well-known/agent-card.json. Auth is an X-API-Key, x402 pay-per-contract on Base, or an ECDSA wallet signature; 25 free developer contracts. No OpenAPI or SDK is published. Not Amber International (Nasdaq: AMBR).

## Kin Score — 53.7 / 100 (developing)

Scored 2026-10-09 under rubric 0.23.0. Trend: flat (+0.0 from 53.7).

| Facet | Score |
|---|---|
| Discoverability | 80.0 |
| Contract Quality | 18.5 |
| Contract Governance | 18.2 |
| Operational Transparency | 68.4 |
| Developer Ergonomics | 56.5 |
| Access Clarity | 76.3 |

Regulatory layer — **Horizontal (data, software, accessibility, platform)**: 38.2 (matched via fallback).

## Agent readiness — 15.0 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | documented |
| Auth Clarity | bearer |
| Idempotency | no |
| Error Semantics | documented |
| OpenAPI Examples | documented |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | derived |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | flavored |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## APIs (3)

- **Ambr REST API** — JSON REST API at https://getamber.dev/api/v1 for the full mandate lifecycle: list templates (public), create a contract from a template (X-API-Key with credits, or x402 pay-per-...
- **Ambr MCP Server** — One remote Model Context Protocol server at https://getamber.dev/api/mcp — Streamable HTTP in stateless JSON mode, protocol version 2025-03-26, serverInfo ambr-mcp-server 1.0.0....
- **Ambr A2A Agent** — Agent-to-Agent JSON-RPC endpoint at https://getamber.dev/api/a2a implementing message/send, tasks/get and tasks/cancel (tasks are processed synchronously), discovered through an...

## MCP servers (1)

- **Ambr MCP Server** — Ambr operates ONE remote MCP server at https://getamber.dev/api/mcp — the same host that serves its REST API (/api/v1), its A2A endpoint (/api/a2a) and its agent card. It is Str...

## Security (3)

- **Getamber Dev Authentication** — apiKey/x402-payment/wallet-signature/share-token/session-token · 5 schemes
- **Getamber Dev Domain Security** — TLSv1.3 · HSTS · DMARC
- **Getamber Dev Vulnerability Disclosure** — Hackerone · security.txt · contact published

## Plans (1)

- **Getamber Dev Plans Pricing**

## Tags

Company, AI Agents, Agentic Commerce, Contracts, Legal, Ricardian Contracts, Delegation, Blockchain, Base L2, MCP, A2A, x402, Agent-Native

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/getamber-dev/). Scores are computed from the provider's own public artifacts under a published rubric.