Blockaid

Blockaid is a web3 security platform that detects and prevents scams, fraud, financial risk, and smart-contract exploits in real time. Its API scans transactions, addresses, tokens, dApp sites, and signed messages across EVM chains, Solana, Bitcoin, Stellar, Sui, Starknet, Tron, and Hedera, returning a risk verdict that wallets, exchanges, and marketplaces (MetaMask, Coinbase, Uniswap, OpenSea) use to block malicious activity before a user signs. Products include End User Protection, Onchain Monitoring, Crypto Fraud Prevention, the Cosigner policy engine, and compliance Risk Exposure. Backed by Greylock, GV, and Ribbit Capital.

Blockaid publishes 1 API on the APIs.io network. Tagged areas include Company, Fintech, Web3 Security, Blockchain, and Crypto.

The Blockaid catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Blockaid’s developer surface includes documentation, API reference, engineering blog, support, authentication, and 20 more developer resources.

🌐 Visit website 📡 Source on GitHub
37.5/100 thin Agent 71/100 agent native Full breakdown ↓
scored 2026-07-20 · rubric v0.4
1 APIs 1 MCP Servers 0 Features
CompanyFintechWeb3 SecurityBlockchainCryptoFraud PreventionTransaction ScanningWallet SecurityComplianceThreat Detection

API Rating

API Evangelist API Evangelist Rating How this is scored →
scored 2026-07-20 · rubric v0.4
Composite quality — 37.5/100 · thin
Contract Quality 9.4 / 25
Developer Ergonomics 10.9 / 20
Commercial Clarity 4.2 / 20
Operational Transparency 3.8 / 13
Governance 0.0 / 12
Discoverability 9.3 / 10
Agent readiness — 71/100 · agent native
Machine-Readable Contract 18 / 18
Agentic Access Contract 15 / 15
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 6 / 6
Agent Skills 5 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/blockaid: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs

Blockaid API

Real-time risk scanning for web3 transactions, addresses, tokens, dApp sites, and messages across EVM, Solana, Bitcoin, Stellar, Sui, Starknet, Tron, and Hedera. OpenAPI 3.1 wit...

MCP Servers

blockaid-mcp.yml

MCP SERVER

Event Specifications

Blockaid Token Webhooks

ASYNCAPI

Resources

Documentation 3

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference
 OpenAPI
OpenAPI

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 MCPServer
MCPServer
 LLMsTxt
LLMsTxt
 AgentSkill
AgentSkill

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conformance
Conformance
 ErrorCatalog
ErrorCatalog
 Lifecycle
Lifecycle
 Conventions
Conventions
 DataModel
DataModel
 Webhooks
Webhooks

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages
 SDKs
SDKs

Access & Security 2

Authentication, authorization, and security posture

Authentication
Authentication
 DomainSecurity
DomainSecurity

Operate 2

Status, limits, changes, and where to get help

Support
Support
 StatusPage
StatusPage

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Other 1

Properties that don't map to a standard resource type

Overlay
Overlay

Source (apis.yml)

apis.yml Raw ↑ 
aid: blockaid
name: Blockaid
description: Blockaid is a web3 security platform that detects and prevents scams, fraud, financial risk, and smart-contract
  exploits in real time. Its API scans transactions, addresses, tokens, dApp sites, and signed messages across EVM chains,
  Solana, Bitcoin, Stellar, Sui, Starknet, Tron, and Hedera, returning a risk verdict that wallets, exchanges, and marketplaces
  (MetaMask, Coinbase, Uniswap, OpenSea) use to block malicious activity before a user signs. Products include End User Protection,
  Onchain Monitoring, Crypto Fraud Prevention, the Cosigner policy engine, and compliance Risk Exposure. Backed by Greylock,
  GV, and Ribbit Capital.
image: https://blockaid.io/images/logos/blockaid.svg
url: https://raw.githubusercontent.com/api-evangelist/blockaid/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- greylock
- gv
- ribbit-capital
x-tier: profiled
x-tier-reason: enriched-2026-07-18
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-18'
tags:
- Company
- Fintech
- Web3 Security
- Blockchain
- Crypto
- Fraud Prevention
- Transaction Scanning
- Wallet Security
- Compliance
- Threat Detection
apis:
- name: Blockaid API
  description: Real-time risk scanning for web3 transactions, addresses, tokens, dApp sites, and messages across EVM, Solana,
    Bitcoin, Stellar, Sui, Starknet, Tron, and Hedera. OpenAPI 3.1 with 93 operations; X-API-Key header authentication.
  humanURL: https://docs.blockaid.io/docs/introduction
  baseURL: https://api.blockaid.io
  tags:
  - Web3 Security
  - Transaction Scanning
  - Token Scanning
  properties:
  - type: OpenAPI
    url: openapi/blockaid-openapi-original.yml
  - type: Documentation
    url: https://docs.blockaid.io/docs/introduction
  - type: APIReference
    url: https://docs.blockaid.io/reference/openapi-schema
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://blockaid.io
- type: Documentation
  url: https://docs.blockaid.io/docs/introduction
- type: APIReference
  url: https://docs.blockaid.io/reference/openapi-schema
- type: OpenAPI
  url: openapi/blockaid-openapi-original.yml
- type: Blog
  url: https://blockaid.io/blog
- type: Support
  url: https://blockaid.io/contact
- type: GitHubOrganization
  url: https://github.com/blockaid-official
- type: StatusPage
  url: https://status.blockaid.io
- type: TermsOfService
  url: https://www.blockaid.io/legal/terms-of-use
- type: PrivacyPolicy
  url: https://www.blockaid.io/legal/privacy-policy
- type: Authentication
  url: authentication/blockaid-authentication.yml
- type: AgenticAccess
  url: agentic-access/blockaid-agentic-access.yml
- type: DomainSecurity
  url: security/blockaid-domain-security.yml
- type: Packages
  url: packages/blockaid-packages.yml
- type: SDKs
  url: packages/blockaid-packages.yml
- type: MCPServer
  url: mcp/blockaid-mcp.yml
- type: LLMsTxt
  url: llms/blockaid-llms.txt
- type: Overlay
  url: overlays/blockaid-openapi-overlay.yaml
- type: Conformance
  url: conformance/blockaid-conformance.yml
- type: ErrorCatalog
  url: errors/blockaid-problem-types.yml
- type: Lifecycle
  url: lifecycle/blockaid-lifecycle.yml
- type: Conventions
  url: conventions/blockaid-conventions.yml
- type: DataModel
  url: data-model/blockaid-data-model.yml
- type: Webhooks
  url: asyncapi/blockaid-token-webhooks.yml
- type: AgentSkill
  url: skills/_index.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence