Ambr

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).

Ambr is listed with 3 APIs on the APIs.io network. Tagged areas include Company, AI Agents, Agentic Commerce, Contracts, and Legal.

Ambr’s developer surface includes documentation, API reference, getting-started guide, signup flow, pricing, support, changelog, and 36 more developer resources.

🌐 Visit website 📡 Source on GitHub

53.7/100 developing ▬ flat Agent 15/100 agent aware Front door AI 5/6 prominent Full breakdown ↓
scored 2026-10-09 · rubric v0.23.0

3 APIs 1 MCP Servers

Company AI Agents Agentic Commerce Contracts LegalRicardian ContractsDelegation Blockchain Base L2 MCP A2A x402 Agent-Native

Kin Score

Kin Score How this is scored →
scored 2026-10-09 · rubric v0.23.0

Composite quality — 53.7/100 · developing

Contract Quality 3.9 / 21

Developer Ergonomics 9.6 / 17

Access Clarity 13.0 / 17

Operational Transparency 7.6 / 11

Contract Governance 1.9 / 10

Discoverability 6.8 / 9

Regulatory Posture 5.7 / 15

Agent readiness — 15/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 8 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/getamber-dev: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

x402

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

APIs 3

Individual APIs this provider publishes, each with its own machine-readable definition.

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

Model Context Protocol servers that expose these APIs to AI agents.

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...

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Getamber Dev Plans Pricing

10 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Getamber Dev Rate Limits

2 limits

RATE LIMITS

JSON Schema 6

Standalone JSON Schema definitions for this provider's data models.

Getamber Dev C1 Api Access

0 properties

JSON SCHEMA

Getamber Dev C2 Compute Sla

0 properties

JSON SCHEMA

Getamber Dev C3 Task Execution

0 properties

JSON SCHEMA

Getamber Dev D1 General Auth

0 properties

JSON SCHEMA

Getamber Dev D2 Limited Service

0 properties

JSON SCHEMA

Getamber Dev D3 Fleet Auth

0 properties

JSON SCHEMA

Examples 1

Example request and response payloads for these APIs.

Getamber Dev Templates Response

1 fields

EXAMPLE

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Getamber Dev Authentication

apiKey/x402-payment/wallet-signature/share-token/session-token · 5 schemes

SECURITY

Getamber Dev Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Getamber Dev Vulnerability Disclosure

Hackerone · security.txt · contact published

SECURITY

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Specification

Specification

Agent Surfaces 6

MCP servers, agent skills, and machine-readable catalogs

MCPServer

LLMsTxt

LLMsTxt

AgentSkill

AgentSkill

AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Lifecycle

Conventions

ErrorCatalog

Conformance

DataModel

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

SourceCode

SourceCode

Packages

Packages

Access & Security 5

Authentication, authorization, and security posture

Authentication

Authentication

Security

Security

SecurityPolicy

SecurityPolicy

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 6

Status, limits, changes, and where to get help

Support

Community

StatusPage

ChangeLog

ChangeLog

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

Plans

TermsOfService

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Twitter

Twitter

Other 5

Properties that don't map to a standard resource type

AgentCard

AgentCard

RegulatoryPosture

RegulatoryPosture

DataSubjectRequest

DataSubjectRequest

AITransparency

AITransparency

ExitAssistance

ExitAssistance

Source (apis.yml)

aid: getamber-dev
name: Ambr
description: '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).'
deliveryModel:
  model: unknown
  license_evidence:
    repo: getambr/ambr
    spdx: NOASSERTION
    stars: 0
  open_source: unknown
  commercial: true
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - pricing
  - repository-unlicensed
  generated: '2026-09-25'
  method: derived
image: https://ambr.run/logo.png
url: https://raw.githubusercontent.com/api-evangelist/getamber-dev/refs/heads/main/apis.yml
x-type: company
x-source: harvest:a2a-registry
x-tier: enriched
x-tier-reason: enrichment pass 2026-09-19 (local-v3)
x-domains:
  website: ambr.run
  platform: getamber.dev
  note: getamber.dev/ 307s to ambr.run/; the API, MCP, A2A, docs, dashboard and agent card all live on getamber.dev, the marketing
    site and legal pages on ambr.run. Both are Ambr (agent card provider.url, llms.txt, README). The slug follows the domain
    the harvest recorded.
position: Producing
specificationVersion: '0.20'
created: '2026-09-19'
modified: '2026-09-19'
tags:
- Company
- AI Agents
- Agentic Commerce
- Contracts
- Legal
- Ricardian Contracts
- Delegation
- Blockchain
- Base L2
- MCP
- A2A
- x402
- Agent-Native
tags_raw:
- Company
- AI Agents
- Agent Commerce
- Contracts
- Legal
- Ricardian Contracts
- Delegation
- Blockchain
- Base L2
- MCP
- A2A
- x402
- agent-native
apis:
- aid: getamber-dev:ambr-rest-api
  name: Ambr REST API
  description: '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-contract), share it by reader URL, handshake (accept
    / reject / request changes), sign with an ECDSA wallet signature, read a contract by id / hash / UUID (metadata public,
    full text with key or share token), a public validity check (is_currently_valid, is_expired, revoked_at), revoke (terminal,
    cascades to child delegations), issue API keys, register delegations, verify ZK identity, and wallet-auth flows. A public
    pricing endpoint (/api/v1/pricing) is the canonical price source and /api/health is a public readiness probe. No OpenAPI
    is published; the reference is https://getamber.dev/docs (endpoint table) and https://getamber.dev/developers (snippets,
    errors, rate limits).'
  image: https://ambr.run/logo.png
  humanURL: https://getamber.dev/docs
  baseURL: https://getamber.dev/api/v1
  tags:
  - Contracts
  - Delegation
  - Legal
  - AI Agents
  - x402
  properties:
  - type: Documentation
    url: https://getamber.dev/docs
  - type: APIReference
    url: https://getamber.dev/developers
  - type: GettingStarted
    url: https://getamber.dev/docs
  - type: Authentication
    url: authentication/getamber-dev-authentication.yml
  - type: Conventions
    url: conventions/getamber-dev-conventions.yml
  - type: ErrorCatalog
    url: errors/getamber-dev-problem-types.yml
  - type: RateLimits
    url: rate-limits/getamber-dev-rate-limits.yml
  - type: Plans
    url: plans/getamber-dev-plans-pricing.yml
  - type: Pricing
    url: https://getamber.dev/api/v1/pricing
  - type: Lifecycle
    url: lifecycle/getamber-dev-lifecycle.yml
  - type: DataModel
    url: data-model/getamber-dev-data-model.yml
  - type: Examples
    url: examples/getamber-dev-templates-response.json
  - type: JSONSchema
    url: json-schema/getamber-dev-d1-general-auth-schema.json
  - type: JSONSchema
    url: json-schema/getamber-dev-d2-limited-service-schema.json
  - type: JSONSchema
    url: json-schema/getamber-dev-d3-fleet-auth-schema.json
  - type: JSONSchema
    url: json-schema/getamber-dev-c1-api-access-schema.json
  - type: JSONSchema
    url: json-schema/getamber-dev-c2-compute-sla-schema.json
  - type: JSONSchema
    url: json-schema/getamber-dev-c3-task-execution-schema.json
  - type: JSONSchema
    url: https://github.com/getambr/ambr/tree/master/open-source/contract-schemas/templates
- aid: getamber-dev:ambr-mcp-server
  name: Ambr MCP Server
  description: '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. Anonymous initialize and tools/list return six tools
    with real inputSchemas and annotations: ambr_list_templates, ambr_create_contract, ambr_get_contract, ambr_get_contract_status,
    ambr_verify_hash, ambr_agent_handshake. Read-only tools run without a credential; state-changing tools take an X-API-Key
    header or answer with an x402 v2 payment challenge. No stdio package exists. A server.json in the official registry schema
    sits in the getambr/ambr repository; Glama lists the connector as healthy.'
  image: https://ambr.run/logo.png
  humanURL: https://getamber.dev/docs
  baseURL: https://getamber.dev/api/mcp
  tags:
  - MCP
  - Agent-Native
  - AI Agents
  tags_raw:
  - MCP
  - agent-native
  - AI Agents
  properties:
  - type: MCPServer
    url: mcp/getamber-dev-mcp.yml
  - type: MCPServer
    url: https://getamber.dev/api/mcp
  - type: Documentation
    url: https://getamber.dev/docs
  - type: Authentication
    url: authentication/getamber-dev-authentication.yml
- aid: getamber-dev:ambr-a2a-agent
  name: Ambr A2A Agent
  description: 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 agent card served at /.well-known/agent-card.json and the legacy
    /.well-known/agent.json on both getamber.dev and ambr.run. The card declares six skills (create_contract, list_templates,
    get_contract, verify_hash, get_status, agent_handshake), apiKey and x402 security schemes, an MCP additional interface,
    a live pricing source and compliesWith urn:ambr:ricardian-v1; it is graded flavored against A2A 1.0.0 because it carries
    no top-level protocolVersion.
  image: https://ambr.run/logo.png
  humanURL: https://getamber.dev/docs
  baseURL: https://getamber.dev/api/a2a
  tags:
  - A2A
  - Agent-Native
  - AI Agents
  tags_raw:
  - A2A
  - agent-native
  - AI Agents
  properties:
  - type: AgentCard
    url: a2a/getamber-dev-a2a.yml
  - type: AgentCard
    url: https://getamber.dev/.well-known/agent-card.json
  - type: Documentation
    url: https://getamber.dev/docs
  - type: Authentication
    url: authentication/getamber-dev-authentication.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://ambr.run/
- type: DeveloperPortal
  url: https://getamber.dev/developers
- type: Documentation
  url: https://getamber.dev/docs
- type: APIReference
  url: https://getamber.dev/developers
- type: GettingStarted
  url: https://getamber.dev/docs
- type: SignUp
  url: https://getamber.dev/activate
- type: Login
  url: https://getamber.dev/dashboard
- type: Pricing
  url: https://getamber.dev/activate
- type: Plans
  url: plans/getamber-dev-plans-pricing.yml
- type: TermsOfService
  url: https://ambr.run/terms
- type: PrivacyPolicy
  url: https://ambr.run/privacy
- type: Support
  url: https://discord.com/invite/HjvJFfjr
- type: Community
  url: https://discord.com/invite/HjvJFfjr
- type: GitHubOrganization
  url: https://github.com/getambr
- type: SourceCode
  url: https://github.com/getambr/ambr
- type: Twitter
  url: https://x.com/ambr_run
- type: StatusPage
  url: https://ambr.run/status
- type: ChangeLog
  url: changelog/getamber-dev-changelog.yml
- type: ChangeLog
  url: https://github.com/getambr/ambr/blob/master/CHANGELOG.md
- type: Lifecycle
  url: lifecycle/getamber-dev-lifecycle.yml
- type: AgentCard
  url: a2a/getamber-dev-a2a.yml
- type: MCPServer
  url: mcp/getamber-dev-mcp.yml
- type: LLMsTxt
  url: llms/getamber-dev-llms.txt
- type: LLMsTxt
  url: https://ambr.run/llms.txt
- type: Specification
  url: https://ambr.run/spec/ricardian-v1
- type: AgentSkill
  url: skills/_index.yml
- type: AgentSkill
  url: skills/getamber-dev-create-and-activate-mandate.md
- type: AgentSkill
  url: skills/getamber-dev-verify-mandate.md
- type: Authentication
  url: authentication/getamber-dev-authentication.yml
- type: Conventions
  url: conventions/getamber-dev-conventions.yml
- type: ErrorCatalog
  url: errors/getamber-dev-problem-types.yml
- type: RateLimits
  url: rate-limits/getamber-dev-rate-limits.yml
- type: Conformance
  url: conformance/getamber-dev-conformance.yml
- type: DataModel
  url: data-model/getamber-dev-data-model.yml
- type: Security
  url: security/getamber-dev-vulnerability-disclosure.yml
- type: SecurityPolicy
  url: https://github.com/getambr/ambr/blob/master/SECURITY.md
- type: VulnerabilityDisclosure
  url: security/getamber-dev-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/getamber-dev-domain-security.yml
- type: Packages
  url: packages/getamber-dev-packages.yml
- type: RegulatoryPosture
  url: regulatory/getamber-dev-regulatory-posture.yml
- type: DataSubjectRequest
  url: https://ambr.run/privacy
- type: AITransparency
  url: https://ambr.run/terms
- type: ExitAssistance
  url: https://ambr.run/privacy
x-enrichment:
  date: '2026-09-19'
  status: enriched
  artifacts_added: 32
  pass: local-v3
  notes: 'Real provider surface: A2A agent card (probed, graded flavored — no protocolVersion), remote MCP server (anonymous
    tools/list, 6 tools with inputSchemas), machine-readable pricing endpoint, llms.txt, MIT contract-template JSON Schemas,
    CHANGELOG.md and SECURITY.md from github.com/getambr/ambr. No OpenAPI, no SDK, no OAuth/OIDC/security.txt/api-catalog
    on any host. baseURL https://getamber.dev/api/v1 is the documented base ("Base URL: https://getamber.dev/api/v1" on /docs);
    repair-api-bases flags it nonprod-host only because the .dev TLD matches its dev-substring heuristic — a false positive,
    left as is.'

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