Agent Zero

Agent Zero (On-Chain Agent Intel, onchainagentintel.io) is an agent-native intelligence service for the ERC-8004 agent economy: it continuously indexes the ERC-8004 agents registered on Base and Ethereum, probes their advertised MCP, OpenAPI and .well-known endpoints for liveness, joins on-chain payment activity and ReputationRegistry rows, and scores each agent for buyer-POV readiness and trust. The intelligence is sold per call over the x402 protocol (USDC via EIP-3009 or native ETH, no accounts, no API keys) through a 25-operation OpenAPI 3.1 REST API at https://api.onchainagentintel.io, a free anonymous remote MCP server at /mcp, an A2A agent card at /.well-known/agent-card.json, an x402 Bazaar discovery manifest, an llms.txt and a published Agent Skill. It also sells Solidity security audits and ERC-8183 deliverable evaluations, and is itself ERC-8004 agentId 19353 on Base.

Agent Zero publishes 4 API contracts indexed on the APIs.io network, including Paid X402 API, Public API, and 2 more. Tagged areas include Agents, Agent Intelligence, ERC-8004, x402, and Agentic Commerce.

Agent Zero’s developer surface includes documentation, API reference, pricing, engineering blog, and 15 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

45.8/100 developing ▬ flat Agent 34/100 agent ready Front door AI 5/6 prominent Heartbeat 100/100 alive Full breakdown ↓
scored 2026-11-01 · rubric v0.26.0 · Show this score on your site →

1 published contract 1 MCP Servers 3 Agent Skills

Agents Agent Intelligence ERC-8004 x402 Agentic Commerce Blockchain Ethereum Base Web3 MCP A2A Smart ContractsSecurity AuditsAgent-Native

Kin Score

Kin Score How this is scored →
scored 2026-11-01 · rubric v0.26.0

Composite quality — 45.8/100 · developing

Contract Quality 8.9 / 19

Developer Ergonomics 7.5 / 15

Access Clarity 9.5 / 15

Operational Transparency 1.5 / 10

Contract Governance 1.6 / 9

Discoverability 5.6 / 8

Regulatory Posture 2.5 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 34/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too
Protected Resource Metadata +5 pts — a served /.well-known/oauth-protected-resource carrying `resource` (documented), and naming its authorization_servers (verified)

4 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 47.5 — up to +13.1 composite points
Operational Transparency scores 15.8 — up to +10.9 composite points
Developer Ergonomics scores 50.0 — up to +10.0 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/onchainagentintel-io/apis.yml: open an issue on github.com/api-evangelist/onchainagentintel-io to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
x402 Micropayments & Agentic Pay-per-Call	undeclared	-	1	1

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 5

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

Agent2Agent

measured — observed by APIs.io (flavored)

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

Agent Skills

measured — observed by APIs.io (published)

OpenAPI

measured — observed by APIs.io (published)

APIs 4

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

Agent Zero MCP Server

Free, anonymous remote Model Context Protocol server at https://api.onchainagentintel.io/mcp (Streamable HTTP, protocol version 2025-06-18, serverInfo agent-zero-intel 1.8.0). t...

Agent Zero A2A Agent

Agent2Agent surface: an agent card served from https://onchainagentintel.io/.well-known/agent-card.json (mirrored on www and api hosts) naming the JSON-RPC endpoint https://api....

Agent Zero Paid X402 API

Paid endpoints — settle with X-PAYMENT header per x402.

Agent Zero Public API

Free endpoints — no payment, no auth.

MCP Servers 1

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

Agent Zero MCP Server

Agent Zero operates a free, anonymous remote MCP server at https://api.onchainagentintel.io/mcp (Streamable HTTP; a GET or a POST without Accept text/event-stream returns 406 -3...

MCP SERVER

Agent Skills 3

Packaged agent skills for driving this provider's APIs from an AI assistant.

onchain-agent-intel

AGENT SKILL

Buy a 30-day flat-rate subscription and query intel with it

AGENT SKILL

Vet a counterparty ERC-8004 agent before transacting

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Onchainagentintel Io Plans Pricing

11 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Onchainagentintel Io Rate Limits

0 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Onchainagentintel Io Finops

FINOPS

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Onchainagentintel Io Openapi Overlay

6 actions · update · onchainagentintel-io-openapi.yml

DERIVED

Security Posture 2

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

Onchainagentintel Io Authentication

apiKey · 3 schemes

SECURITY

Onchainagentintel Io Domain Security

TLSv1.3

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 6

MCP servers, agent skills, and machine-readable catalogs

AgentSkill

MCPServer

WellKnown

LLMsTxt

LLMsTxt

AgentSkill

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Conformance

Conformance

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

Pricing

Pricing

Company 3

The organization behind the API

Website

Website

Blog

Blog

BlogRSS

BlogRSS

Other 2

Properties that don't map to a standard resource type

Overlay

Overlay

AgentCard

AgentCard

Source (apis.yml)

aid: onchainagentintel-io
name: Agent Zero
description: 'Agent Zero (On-Chain Agent Intel, onchainagentintel.io) is an agent-native intelligence service for the ERC-8004
  agent economy: it continuously indexes the ERC-8004 agents registered on Base and Ethereum, probes their advertised MCP,
  OpenAPI and .well-known endpoints for liveness, joins on-chain payment activity and ReputationRegistry rows, and scores
  each agent for buyer-POV readiness and trust. The intelligence is sold per call over the x402 protocol (USDC via EIP-3009
  or native ETH, no accounts, no API keys) through a 25-operation OpenAPI 3.1 REST API at https://api.onchainagentintel.io,
  a free anonymous remote MCP server at /mcp, an A2A agent card at /.well-known/agent-card.json, an x402 Bazaar discovery
  manifest, an llms.txt and a published Agent Skill. It also sells Solidity security audits and ERC-8183 deliverable evaluations,
  and is itself ERC-8004 agentId 19353 on Base.'
url: https://raw.githubusercontent.com/api-evangelist/onchainagentintel-io/refs/heads/main/apis.yml
image: https://onchainagentintel.io/logo.png
x-type: company
x-source: harvest:a2a-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-09-19 (local-v3; was a2a-registry harvest stub)
specificationVersion: '0.20'
created: '2026-09-19'
modified: '2026-09-19'
x-docs-platform: redoc
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
tags:
- Agents
- Agent Intelligence
- ERC-8004
- x402
- Agentic Commerce
- Blockchain
- Ethereum
- Base
- Web3
- MCP
- A2A
- Smart Contracts
- Security Audits
- Agent-Native
tags_raw:
- Agents
- Agent intelligence
- ERC-8004
- x402
- Agent commerce
- Blockchain
- Ethereum
- Base
- Web3
- MCP
- A2A
- Smart contracts
- Security audits
- Agent-native
- Agent Commerce
- agent-native
apis:
- aid: onchainagentintel-io:agent-zero-mcp-server
  name: Agent Zero MCP Server
  description: Free, anonymous remote Model Context Protocol server at https://api.onchainagentintel.io/mcp (Streamable HTTP,
    protocol version 2025-06-18, serverInfo agent-zero-intel 1.8.0). tools/list answers without credentials with four read-only,
    counts-only tools — get_coverage_stats, get_leaderboards, get_agent_summary and get_network_teaser — each carrying a real
    inputSchema and an upgrade pointer to the paid x402 REST endpoint that returns the enriched data. prompts/list and resources/list
    return empty arrays; a request without Accept text/event-stream is refused with 406.
  humanURL: https://onchainagentintel.io/docs
  baseURL: https://api.onchainagentintel.io/mcp
  tags:
  - MCP
  - Agent-Native
  - Agent Intelligence
  tags_raw:
  - MCP
  - agent-native
  - Agent Intelligence
  properties:
  - type: MCPServer
    url: mcp/onchainagentintel-io-mcp.yml
  - type: MCPServer
    name: MCP endpoint (Streamable HTTP)
    url: https://api.onchainagentintel.io/mcp
  - type: ToolCrosswalk
    url: mcp/onchainagentintel-io-tool-crosswalk.yml
- aid: onchainagentintel-io:agent-zero-a2a-agent
  name: Agent Zero A2A Agent
  description: 'Agent2Agent surface: an agent card served from https://onchainagentintel.io/.well-known/agent-card.json (mirrored
    on www and api hosts) naming the JSON-RPC endpoint https://api.onchainagentintel.io/a2a/v1 and sixteen skills — x402 settlement,
    the free MCP server, the nine paid intel services, smart-contract audit, ERC-8183 evaluation and the free public surfaces
    — under a required a2a-x402 v0.2 payment extension settled to a Safe on Base or Ethereum. The card carries capabilities
    as an object and skills as an array but no top-level protocolVersion, so it grades flavored against A2A 1.0.0; the legacy
    /.well-known/agent.json declares protocolVersion 0.3.0. Streaming and push notifications are declared unsupported.'
  humanURL: https://onchainagentintel.io/docs
  baseURL: https://api.onchainagentintel.io/a2a/v1
  tags:
  - A2A
  - Agent-Native
  - x402
  tags_raw:
  - A2A
  - agent-native
  - x402
  properties:
  - type: AgentCard
    url: a2a/onchainagentintel-io-a2a.yml
  - type: AgentCard
    name: A2A Agent Card (provider-hosted)
    url: https://onchainagentintel.io/.well-known/agent-card.json
- aid: onchainagentintel-io:onchainagentintel-io-paid-x402-api
  name: Agent Zero Paid X402 API
  description: Paid endpoints — settle with X-PAYMENT header per x402.
  humanURL: https://onchainagentintel.io/docs
  baseURL: https://api.onchainagentintel.io
  tags:
  - Paid (x402)
  tags_raw:
  - paid-x402
  properties:
  - type: OpenAPI
    url: openapi/onchainagentintel-io-paid-x402-api-openapi.yml
  - type: Documentation
    url: https://onchainagentintel.io/docs
  - type: APIReference
    url: https://api.onchainagentintel.io/v1/public/docs
  - type: GettingStarted
    url: https://onchainagentintel.io/docs#quickstart
  - type: Authentication
    url: authentication/onchainagentintel-io-authentication.yml
  - type: Conventions
    url: conventions/onchainagentintel-io-conventions.yml
  - type: Idempotency
    url: conventions/onchainagentintel-io-conventions.yml
  - type: ErrorCatalog
    url: errors/onchainagentintel-io-problem-types.yml
  - type: Lifecycle
    url: lifecycle/onchainagentintel-io-lifecycle.yml
  - type: ChangeLog
    url: changelog/onchainagentintel-io-changelog.yml
  - type: Conformance
    url: conformance/onchainagentintel-io-conformance.yml
  - type: DataModel
    url: data-model/onchainagentintel-io-data-model.yml
  - type: Components
    url: components/onchainagentintel-io-components.yml
  - type: Plans
    url: plans/onchainagentintel-io-plans-pricing.yml
  - type: RateLimits
    url: rate-limits/onchainagentintel-io-rate-limits.yml
- aid: onchainagentintel-io:onchainagentintel-io-public-api
  name: Agent Zero Public API
  description: Free endpoints — no payment, no auth.
  humanURL: https://onchainagentintel.io/docs
  baseURL: https://api.onchainagentintel.io
  tags:
  - Public
  tags_raw:
  - public
  properties:
  - type: OpenAPI
    url: openapi/onchainagentintel-io-public-api-openapi.yml
  - type: Documentation
    url: https://onchainagentintel.io/docs
  - type: APIReference
    url: https://api.onchainagentintel.io/v1/public/docs
  - type: GettingStarted
    url: https://onchainagentintel.io/docs#quickstart
  - type: Authentication
    url: authentication/onchainagentintel-io-authentication.yml
  - type: Conventions
    url: conventions/onchainagentintel-io-conventions.yml
  - type: Idempotency
    url: conventions/onchainagentintel-io-conventions.yml
  - type: ErrorCatalog
    url: errors/onchainagentintel-io-problem-types.yml
  - type: Lifecycle
    url: lifecycle/onchainagentintel-io-lifecycle.yml
  - type: ChangeLog
    url: changelog/onchainagentintel-io-changelog.yml
  - type: Conformance
    url: conformance/onchainagentintel-io-conformance.yml
  - type: DataModel
    url: data-model/onchainagentintel-io-data-model.yml
  - type: Components
    url: components/onchainagentintel-io-components.yml
  - type: Plans
    url: plans/onchainagentintel-io-plans-pricing.yml
  - type: RateLimits
    url: rate-limits/onchainagentintel-io-rate-limits.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/onchainagentintel-io-plans-pricing.yml
- type: RateLimits
  url: rate-limits/onchainagentintel-io-rate-limits.yml
- type: Overlay
  url: overlays/onchainagentintel-io-openapi-overlay.yaml
- type: AgentSkill
  url: https://onchainagentintel.io/.agents/skills/onchain-agent-intel/SKILL.md
- type: DomainSecurity
  url: security/onchainagentintel-io-domain-security.yml
- type: Website
  url: https://onchainagentintel.io/
- type: Documentation
  url: https://onchainagentintel.io/docs
- type: APIReference
  url: https://api.onchainagentintel.io/v1/public/docs
- type: Pricing
  url: https://onchainagentintel.io/services
- type: Blog
  url: https://onchainagentintel.io/blog
- type: BlogRSS
  url: https://onchainagentintel.io/feed.xml
- type: Login
  url: https://app.onchainagentintel.io/
- type: AgentCard
  url: a2a/onchainagentintel-io-a2a.yml
- type: MCPServer
  url: mcp/onchainagentintel-io-mcp.yml
- type: WellKnown
  url: well-known/onchainagentintel-io-well-known.yml
- type: LLMsTxt
  url: llms/onchainagentintel-io-llms.txt
- type: LLMsTxt
  name: llms.txt (provider-hosted)
  url: https://onchainagentintel.io/llms.txt
- type: AgentSkill
  url: skills/_index.yml
- type: Conformance
  url: conformance/onchainagentintel-io-conformance.yml
x-enrichment:
  date: '2026-09-19'
  status: enriched
  artifacts_added: 23
  pass: local-v3
x-a2a:
  verified: true
  probed: '2026-09-26'
  url: https://onchainagentintel.io/.well-known/agent-card.json
  grade: flavored
  protocol_version: '2.0'
  control: 200

Agent Zero API — frequently asked questions

Does Agent Zero have an API?

Yes. APIs.io lists 4 APIs from Agent Zero, including Agent Zero MCP Server, Agent Zero A2A Agent and Agent Zero Paid X402 API, and 1 more.

Is there an OpenAPI specification for the Agent Zero API?

Yes. APIs.io indexes 2 OpenAPI specifications for Agent Zero, each linked for download from this page.

How do I authenticate with the Agent Zero API?

Agent Zero uses bearer-token authentication (apiKey · 3 schemes). The details are profiled on APIs.io as Onchainagentintel Io Authentication.

How much does the Agent Zero API cost?

APIs.io lists 11 pricing plans for Agent Zero, with each plan's price, limits and inclusions under Pricing Plans on this page.

Does Agent Zero have an MCP server?

Yes. APIs.io lists 1 MCP server for Agent Zero: Agent Zero operates a free, anonymous remote MCP server at https://api.onchainagentintel.io/mcp (Streamable HTTP; a GET or a POST without Accept text/event-stream returns 406 -32600 "Client must accep

Is the Agent Zero API ready for AI agents?

Agent Zero has a Kin Score of 45.8 out of 100 (developing) and an Agent Readiness score of 34.0 (agent-ready), scored by API Evangelist on 2026-11-01.

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