Zerion

Zerion is an Ethereum and Solana wallet and developer platform focused on making onchain data easy to use. The Zerion API delivers clean, normalized wallet data, token analytics, DeFi positions, transaction history, PnL, NFTs, gas prices, swap and bridge quotes, and real-time transaction webhooks across EVM chains and Solana. The same infrastructure powers the Zerion wallet app used by millions. It is a JSON:API REST service with HTTP Basic (API key) authentication plus pay-per-request x402 (Base/Solana USDC) and MPP (Tempo USDC) options aimed at AI agents, an open-source CLI, six packaged agent skills, a hosted MCP server, and Kafka streaming for high-throughput pipelines.

Zerion publishes 9 API contracts indexed on the APIs.io network, including Chains API, Dapps API, Fungibles API, and 6 more. Tagged areas include Company, Web3, Blockchain, Cryptocurrency, and DeFi.

The Zerion catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

Zerion’s developer surface includes documentation, API reference, getting-started guide, pricing, signup flow, engineering blog, authentication, and 29 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

63.9/100 strong ▬ flat Agent 39/100 agent ready Front door AI 1/6 silent Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract 1 MCP Servers 5 Agent Skills

Company Web3 Blockchain Cryptocurrency DeFi Wallets NFT Ethereum Solana Portfolio On-Chain Data Transaction

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Developer Platform & API Ecosystem Management

BC-4270

subscriptions to transactions

POST /v1/tx-subscriptions/ PATCH /v1/tx-subscriptions/{subscription_id}/callback_url

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 63.9/100 · strong

Contract Quality 12.3 / 19

Developer Ergonomics 10.4 / 15

Access Clarity 11.4 / 15

Operational Transparency 6.7 / 10

Contract Governance 1.6 / 9

Discoverability 5.6 / 8

Regulatory Posture 3.3 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 39/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 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 6 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 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 Payments 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):

Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
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)
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 Governance scores 18.2 — up to +9.8 composite points
Contract Quality scores 65.7 — up to +8.6 composite points
Developer Ergonomics scores 69.6 — up to +6.1 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/zerion/apis.yml: open an issue on github.com/api-evangelist/zerion 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
Crypto and Digital-Asset Exchanges	mixed	46.4	-	-
x402 Micropayments & Agentic Pay-per-Call	mixed	46.4	-	-
Browser Extension Stores (company-published Firefox add-ons; Chrome Web Store unreadable)	mixed	46.4	-	-
Raycast Store Extensions (first-party publishers + community-wrapped products)	mixed	46.4	-	-

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 2

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.

Model Context Protocol (MCP)

measured — observed by APIs.io (platform)

OpenAPI

measured — observed by APIs.io (published)

APIs 9

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

Zerion Chains API

Operations related to chains, such as list all chains.

Zerion Dapps API

Operations related to decentralized applications, such as list them all, search or get by ID.

Zerion Fungibles API

Operations related to fungible assets, such as list them all, search or get by ID.

Zerion Gas API

Operations related to gas.

Zerion subscriptions to transactions API

Operations related to subscriptions to transactions.

Zerion Swap API

Operations related to swapping and bridging assets.

Zerion wallet sets API

Operations on a wallet set — aggregated portfolio data across at most one EVM address and one Solana address queried together.

Zerion Wallets API

Operations related to wallets, such as portfolio charts, positions, and transactions.

Zerion Nfts API

Operations related to non fungible assets, such list them, search or get by ID.

Scroll for all 9

Postman Collections 9

Ready-to-run Postman collections for exercising this provider's APIs.

REST chains API

POSTMAN

REST chains dapps API

POSTMAN

REST chains fungibles API

POSTMAN

REST chains gas API

POSTMAN

REST chains nfts API

POSTMAN

REST chains subscriptions to transactions API

POSTMAN

REST chains swap API

POSTMAN

REST chains wallet sets API

POSTMAN

REST chains wallets API

POSTMAN

Scroll for all 9

Open Collections 9

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

REST chains API

OPEN COLLECTION

REST chains dapps API

OPEN COLLECTION

REST chains fungibles API

OPEN COLLECTION

REST chains gas API

OPEN COLLECTION

REST chains nfts API

OPEN COLLECTION

REST chains subscriptions to transactions API

OPEN COLLECTION

REST chains swap API

OPEN COLLECTION

REST chains wallet sets API

OPEN COLLECTION

REST chains wallets API

OPEN COLLECTION

Scroll for all 9

Arazzo Workflows 2

Multi-step API workflows described with the Arazzo specification.

Zerion wallet activity subscription

Create a transaction webhook subscription for a set of wallets, confirm it, then verify the watched-wallet count.

ARAZZO

Zerion wallet overview

Pull a wallet's portfolio, positions, transaction history, and PnL in one flow.

ARAZZO

MCP Servers 1

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

Zerion MCP Server

Official hosted Model Context Protocol server exposing the full Zerion API documentation and OpenAPI spec to AI tools. Once connected, an assistant can search the docs and spec ...

MCP SERVER

Agent Skills 5

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

Read a wallet NFT portfolio

AGENT SKILL

Get swap and bridge quotes

AGENT SKILL

Fetch and interpret wallet transaction history

AGENT SKILL

Subscribe to real-time wallet activity webhooks

AGENT SKILL

Read a wallet portfolio and PnL

AGENT SKILL

Zerion API pricing

Prices published by Zerion. This record is due for a re-check. A free plan or tier is listed.

Plan	Price
Developer	Free
Builder	$149
Startup	$499
Growth	$999
Enterprise	—

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Zerion Plans

5 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Zerion Rate Limits

5 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Zerion

SLA

FinOps 1

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

Zerion Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Zerion Transactions Webhooks

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Zerion API Rules

61 rules · 52 errors 8 warnings 1 info

SPECTRAL

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.

Zerion Api Overlay

2 actions · update · zerion-openapi-original.yml

DERIVED

Security Posture 2

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

Zerion Authentication

http · 1 scheme

SECURITY

Zerion Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Zerion Agentic Access

39 operations · 8 acting · 1 human-in-the-loop

39 operations · 8 acting

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

MCPServer

AgentSkill

LLMsTxt

WellKnown

AgenticAccess

Design & Contract 8

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

Conformance

DataModel

Webhooks

Arazzo

Arazzo

Scroll for all 8

Build 5

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace

PostmanWorkspace

GitHubOrganization

Packages

SDKs

CLI

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 3

Status, limits, changes, and where to get help

ChangeLog

ChangeLog

Deprecation

Deprecation

RateLimits

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

PrivacyPolicy

Plans

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Overlay

Overlay

Source (apis.yml)

aid: zerion
name: Zerion
description: Zerion is an Ethereum and Solana wallet and developer platform focused on making onchain data easy to use. The
  Zerion API delivers clean, normalized wallet data, token analytics, DeFi positions, transaction history, PnL, NFTs, gas
  prices, swap and bridge quotes, and real-time transaction webhooks across EVM chains and Solana. The same infrastructure
  powers the Zerion wallet app used by millions. It is a JSON:API REST service with HTTP Basic (API key) authentication plus
  pay-per-request x402 (Base/Solana USDC) and MPP (Tempo USDC) options aimed at AI agents, an open-source CLI, six packaged
  agent skills, a hosted MCP server, and Kafka streaming for high-throughput pipelines.
url: https://raw.githubusercontent.com/api-evangelist/zerion/refs/heads/main/apis.yml
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  - rate-limits
  - security
  generated: '2026-11-06'
  method: derived
image: https://developers.zerion.io/logo/dark.svg
x-type: company
x-source: vc-portfolio
x-backed-by:
- lightspeed-venture-partners
x-tier: profiled
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
x-docs-platform: mintlify
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-17
tags:
- Company
- Web3
- Blockchain
- Cryptocurrency
- DeFi
- Wallets
- NFT
- Ethereum
- Solana
- Portfolio
- On-Chain Data
- Transaction
tags_raw:
- Company
- Web3
- Blockchain
- Cryptocurrency
- DeFi
- Wallet
- NFT
- Ethereum
- Solana
- Portfolio
- Onchain Data
- Transactions
apis:
- aid: zerion:zerion-chains-api
  name: Zerion Chains API
  description: Operations related to chains, such as list all chains.
  humanURL: https://developers.zerion.io/
  baseURL: https://api.zerion.io
  tags:
  - Chains
  tags_raw:
  - chains
  properties:
  - type: OpenAPI
    url: openapi/zerion-chains-api-openapi.yml
  - type: APIReference
    url: https://developers.zerion.io/api-reference/wallets/get-wallet-portfolio
  - type: Documentation
    url: https://developers.zerion.io/
- aid: zerion:zerion-dapps-api
  name: Zerion Dapps API
  description: Operations related to decentralized applications, such as list them all, search or get by ID.
  humanURL: https://developers.zerion.io/
  baseURL: https://api.zerion.io
  tags:
  - DApps
  tags_raw:
  - dapps
  properties:
  - type: OpenAPI
    url: openapi/zerion-dapps-api-openapi.yml
  - type: APIReference
    url: https://developers.zerion.io/api-reference/wallets/get-wallet-portfolio
  - type: Documentation
    url: https://developers.zerion.io/
- aid: zerion:zerion-fungibles-api
  name: Zerion Fungibles API
  description: Operations related to fungible assets, such as list them all, search or get by ID.
  humanURL: https://developers.zerion.io/
  baseURL: https://api.zerion.io
  tags:
  - fungibles
  properties:
  - type: OpenAPI
    url: openapi/zerion-fungibles-api-openapi.yml
  - type: APIReference
    url: https://developers.zerion.io/api-reference/wallets/get-wallet-portfolio
  - type: Documentation
    url: https://developers.zerion.io/
- aid: zerion:zerion-gas-api
  name: Zerion Gas API
  description: Operations related to gas.
  humanURL: https://developers.zerion.io/
  baseURL: https://api.zerion.io
  tags:
  - Gas
  tags_raw:
  - gas
  properties:
  - type: OpenAPI
    url: openapi/zerion-gas-api-openapi.yml
  - type: APIReference
    url: https://developers.zerion.io/api-reference/wallets/get-wallet-portfolio
  - type: Documentation
    url: https://developers.zerion.io/
- aid: zerion:zerion-subscriptions-to-transactions-api
  name: Zerion subscriptions to transactions API
  description: Operations related to subscriptions to transactions.
  humanURL: https://developers.zerion.io/
  baseURL: https://api.zerion.io
  tags:
  - subscriptions to transactions
  properties:
  - type: OpenAPI
    url: openapi/zerion-subscriptions-to-transactions-api-openapi.yml
  - type: APIReference
    url: https://developers.zerion.io/api-reference/wallets/get-wallet-portfolio
  - type: Documentation
    url: https://developers.zerion.io/
- aid: zerion:zerion-swap-api
  name: Zerion Swap API
  description: Operations related to swapping and bridging assets.
  humanURL: https://developers.zerion.io/
  baseURL: https://api.zerion.io
  tags:
  - Swap
  tags_raw:
  - swap
  properties:
  - type: OpenAPI
    url: openapi/zerion-swap-api-openapi.yml
  - type: APIReference
    url: https://developers.zerion.io/api-reference/wallets/get-wallet-portfolio
  - type: Documentation
    url: https://developers.zerion.io/
- aid: zerion:zerion-wallet-sets-api
  name: Zerion wallet sets API
  description: Operations on a wallet set — aggregated portfolio data across at most one EVM address and one Solana address
    queried together.
  humanURL: https://developers.zerion.io/
  baseURL: https://api.zerion.io
  tags:
  - Wallet Sets
  tags_raw:
  - wallet sets
  properties:
  - type: OpenAPI
    url: openapi/zerion-wallet-sets-api-openapi.yml
  - type: APIReference
    url: https://developers.zerion.io/api-reference/wallets/get-wallet-portfolio
  - type: Documentation
    url: https://developers.zerion.io/
- aid: zerion:zerion-wallets-api
  name: Zerion Wallets API
  description: Operations related to wallets, such as portfolio charts, positions, and transactions.
  humanURL: https://developers.zerion.io/
  baseURL: https://api.zerion.io
  tags:
  - Wallets
  tags_raw:
  - wallets
  properties:
  - type: OpenAPI
    url: openapi/zerion-wallets-api-openapi.yml
  - type: APIReference
    url: https://developers.zerion.io/api-reference/wallets/get-wallet-portfolio
  - type: Documentation
    url: https://developers.zerion.io/
- aid: zerion:zerion-nfts-api
  name: Zerion Nfts API
  description: Operations related to non fungible assets, such list them, search or get by ID.
  humanURL: https://developers.zerion.io/
  baseURL: https://api.zerion.io
  tags:
  - NFT
  tags_raw:
  - nfts
  properties:
  - type: OpenAPI
    url: openapi/zerion-nfts-api-openapi.yml
  - type: APIReference
    url: https://developers.zerion.io/api-reference/wallets/get-wallet-portfolio
  - type: Documentation
    url: https://developers.zerion.io/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: CapabilityMap
  url: capabilities/zerion-capability-edges.yml
  name: Zerion Business Capability Map
- type: Website
  url: https://www.zerion.io/
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/zerion/overview
- url: https://developers.zerion.io/
  type: DeveloperPortal
- url: https://developers.zerion.io/
  type: Documentation
- url: https://developers.zerion.io/api-reference/wallets/get-wallet-portfolio
  type: APIReference
- url: https://developers.zerion.io/quickstart
  type: GettingStarted
- url: https://developers.zerion.io/pricing
  type: Pricing
- url: https://dashboard.zerion.io
  type: SignUp
- url: https://zerion.io/blog/tag/zerion-api/
  type: Blog
- url: https://github.com/zeriontech
  type: GitHubOrganization
- url: https://zerion.io/terms
  type: TermsOfService
- url: https://zerion.io/privacy
  type: PrivacyPolicy
- url: authentication/zerion-authentication.yml
  type: Authentication
- url: packages/zerion-packages.yml
  type: Packages
- url: packages/zerion-packages.yml
  type: SDKs
- url: cli/zerion-cli.yml
  type: CLI
- url: mcp/zerion-mcp.yml
  type: MCPServer
- url: skills/_index.yml
  type: AgentSkill
- url: llms/zerion-llms.txt
  type: LLMsTxt
- url: well-known/zerion-well-known.yml
  type: WellKnown
- url: conventions/zerion-conventions.yml
  type: Conventions
- url: errors/zerion-problem-types.yml
  type: ErrorCatalog
- url: lifecycle/zerion-lifecycle.yml
  type: Lifecycle
- url: changelog/zerion-changelog.yml
  type: ChangeLog
- url: https://developers.zerion.io/changelog
  type: Deprecation
- url: conformance/zerion-conformance.yml
  type: Conformance
- url: data-model/zerion-data-model.yml
  type: DataModel
- url: security/zerion-domain-security.yml
  type: DomainSecurity
- url: asyncapi/zerion-transactions-webhooks.yml
  type: Webhooks
- url: agentic-access/zerion-agentic-access.yml
  type: AgenticAccess
- url: overlays/zerion-api-overlay.yaml
  type: Overlay
- url: rate-limits/zerion-rate-limits.yml
  type: RateLimits
- url: plans/zerion-plans.yml
  type: Plans
- url: arazzo/zerion-wallet-overview.arazzo.yml
  type: Arazzo
  name: Zerion wallet overview
- url: arazzo/zerion-wallet-activity-subscription.arazzo.yml
  type: Arazzo
  name: Zerion wallet activity subscription
x-enrichment:
  date: 2026-07-21
  status: enriched
  artifacts_added: 28
  pass: local-v1

Zerion API — frequently asked questions

Does Zerion have an API?

Yes. APIs.io lists 9 APIs from Zerion, including Zerion Chains API, Zerion Dapps API and Zerion Fungibles API, and 6 more.

Is there an OpenAPI specification for the Zerion API?

Yes. APIs.io indexes 9 OpenAPI specifications for Zerion, each linked for download from this page.

How do I authenticate with the Zerion API?

Zerion uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Zerion Authentication.

How much does the Zerion API cost?

APIs.io lists 5 pricing plans for Zerion, with each plan's price, limits and inclusions under Pricing on this page.

Does Zerion have an MCP server?

Yes. APIs.io lists 1 MCP server for Zerion: Official hosted Model Context Protocol server exposing the full Zerion API documentation and OpenAPI spec to AI tools. Once connected, an assistant can search the docs and spec in real time while gene

Is the Zerion API ready for AI agents?

Zerion has a Kin Score of 63.9 out of 100 (strong) and an Agent Readiness score of 38.6 (agent-ready), scored by API Evangelist on 2026-11-06.

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