Blowfish

Blowfish is a proactive web3 security platform that scans EVM and Solana transactions, EVM messages, and dApp domains before a user signs, returning a recommended action (NONE, WARN, or BLOCK), severity-sorted warnings, and human-readable transaction simulation results. Its Scan API and downloadable domain blocklist help wallets and dApps protect users from scams, malicious token approvals, and phishing across 10+ blockchains. Backed by Paradigm.

Blowfish publishes 4 API contracts indexed on the APIs.io network, including Download blocklist API, Scan domain API, Scan message API, and 1 more. Tagged areas include Company, Security, Web3, Blockchain, and Wallets.

The Blowfish catalog on APIs.io includes 1 Spectral governance ruleset.

Blowfish’s developer surface includes documentation, API reference, getting-started guide, signup flow, engineering blog, pricing, support, and 21 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

36.7/100 thin ▬ flat Agent 31/100 agent ready Heartbeat 34/100 slowing saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 published contract 3 Agent Skills

Company Security Web3 Blockchain WalletsTransaction ScanningFraud Prevention Cryptocurrency

What this lets a business do 1

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

Cybersecurity Management

BC-620

Scan domainScan messageScan transaction

POST /v0/domains POST /ethereum/v0/mainnet/scan/message POST /ethereum/v0/mainnet/scan/transaction POST /solana/v0/mainnet/scan/transactions

Kin Score

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

Composite quality — 36.7/100 · thin

Contract Quality 11.1 / 19

Developer Ergonomics 6.2 / 15

Access Clarity 3.4 / 15

Operational Transparency 0.3 / 10

Contract Governance 2.0 / 9

Discoverability 5.5 / 8

Regulatory Posture 2.6 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 31/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 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):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
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
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
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)

7 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 22.4 — up to +15.5 composite points
Operational Transparency scores 2.6 — up to +12.7 composite points
Developer Ergonomics scores 41.1 — up to +11.8 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/blowfish/apis.yml: open an issue on github.com/api-evangelist/blowfish 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 →

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.

OpenAPI

measured — observed by APIs.io (published)

APIs 4

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

Blowfish Download blocklist API

Endpoints related to downloading blocklists

Blowfish Scan domain API

Endpoints related to scanning dApp domains

Blowfish Scan message API

Endpoints related to scanning blockchain messages

Blowfish Scan transaction API

Endpoints related to scanning blockchain transactions

Open Collections 4

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

API reference Download blocklist API

OPEN COLLECTION

API reference Download blocklist Scan domain API

OPEN COLLECTION

API reference Download blocklist Scan message API

OPEN COLLECTION

API reference Download blocklist Scan transaction API

OPEN COLLECTION

Agent Skills 3

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

Scan a dApp domain for safety

AGENT SKILL

Scan an EVM transaction before signing

AGENT SKILL

Scan Solana transactions before signing

AGENT SKILL

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Blowfish API Rules

67 rules · 65 errors 1 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.

Blowfish V20230308 Overlay

2 actions · update · blowfish-v20230308-openapi-original.yml

DERIVED

Security Posture 2

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

Blowfish Authentication

apiKey · 1 scheme

SECURITY

Blowfish Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access 1

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

Blowfish Agentic Access

5 operations · 5 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 4

MCP servers, agent skills, and machine-readable catalogs

X-MCPServerCandidate

AgentSkill

LLMsTxt

AgenticAccess

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

Conformance

Vocabulary

DataModel

Components

Scroll for all 7

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 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

Pricing

Pricing

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Blog

Blog

Website

Website

Other 2

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Overlay

Overlay

Source (apis.yml)

aid: blowfish
name: Blowfish
description: Blowfish is a proactive web3 security platform that scans EVM and Solana transactions, EVM messages, and dApp
  domains before a user signs, returning a recommended action (NONE, WARN, or BLOCK), severity-sorted warnings, and human-readable
  transaction simulation results. Its Scan API and downloadable domain blocklist help wallets and dApps protect users from
  scams, malicious token approvals, and phishing across 10+ blockchains. Backed by Paradigm.
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: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://raw.githubusercontent.com/blowfishxyz/blowfish-openapi-specs/HEAD/blowfish.png
url: https://raw.githubusercontent.com/api-evangelist/blowfish/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- paradigm
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
tags:
- Company
- Security
- Web3
- Blockchain
- Wallets
- Transaction Scanning
- Fraud Prevention
- Cryptocurrency
tags_raw:
- Company
- Security
- Web3
- Blockchain
- Wallet
- Transaction Scanning
- Fraud Prevention
- Cryptocurrency
apis:
- aid: blowfish:blowfish-download-blocklist-api
  name: Blowfish Download blocklist API
  description: Endpoints related to downloading blocklists
  humanURL: https://docs.blowfish.xyz
  baseURL: https://api.blowfish.xyz
  tags:
  - Download blocklist
  properties:
  - type: OpenAPI
    url: openapi/blowfish-download-blocklist-api-openapi.yml
- aid: blowfish:blowfish-scan-domain-api
  name: Blowfish Scan domain API
  description: Endpoints related to scanning dApp domains
  humanURL: https://docs.blowfish.xyz
  baseURL: https://api.blowfish.xyz
  tags:
  - Scan domain
  properties:
  - type: OpenAPI
    url: openapi/blowfish-scan-domain-api-openapi.yml
- aid: blowfish:blowfish-scan-message-api
  name: Blowfish Scan message API
  description: Endpoints related to scanning blockchain messages
  humanURL: https://docs.blowfish.xyz
  baseURL: https://api.blowfish.xyz
  tags:
  - Scan message
  properties:
  - type: OpenAPI
    url: openapi/blowfish-scan-message-api-openapi.yml
- aid: blowfish:blowfish-scan-transaction-api
  name: Blowfish Scan transaction API
  description: Endpoints related to scanning blockchain transactions
  humanURL: https://docs.blowfish.xyz
  baseURL: https://api.blowfish.xyz
  tags:
  - Scan transaction
  properties:
  - type: OpenAPI
    url: openapi/blowfish-scan-transaction-api-openapi.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: CapabilityMap
  url: capabilities/blowfish-capability-edges.yml
  name: Blowfish Business Capability Map
- type: Overlay
  url: overlays/blowfish-v20230308-overlay.yaml
- type: DeveloperPortal
  url: https://docs.blowfish.xyz
- type: Documentation
  url: https://docs.blowfish.xyz
- type: APIReference
  url: https://docs.blowfish.xyz/reference
- type: GettingStarted
  url: https://docs.blowfish.xyz/docs/introduction
- type: SignUp
  url: https://portal.blowfish.xyz/
- type: Blog
  url: https://blog.blowfish.xyz
- type: GitHubOrganization
  url: https://github.com/blowfishxyz
- type: Pricing
  url: https://blowfish.xyz
- type: PrivacyPolicy
  url: https://extension.blowfish.xyz/privacy
- type: Support
  url: https://form.typeform.com/to/BHue5Hg0
- type: Authentication
  url: authentication/blowfish-authentication.yml
- type: Conventions
  url: conventions/blowfish-conventions.yml
- type: ErrorCatalog
  url: errors/blowfish-problem-types.yml
- type: Lifecycle
  url: lifecycle/blowfish-lifecycle.yml
- type: Conformance
  url: conformance/blowfish-conformance.yml
- type: Vocabulary
  url: vocabulary/blowfish-scan-vocabulary.yml
- type: DataModel
  url: data-model/blowfish-data-model.yml
- type: Packages
  url: packages/blowfish-packages.yml
- type: SDKs
  url: packages/blowfish-packages.yml
- type: Components
  url: components/blowfish-components.yml
- type: X-MCPServerCandidate
  url: mcp/blowfish-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/blowfish-llms.txt
- type: AgenticAccess
  url: agentic-access/blowfish-agentic-access.yml
- type: DomainSecurity
  url: security/blowfish-domain-security.yml
- type: Website
  url: https://blowfish.xyz
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

Blowfish API — frequently asked questions

Does Blowfish have an API?

Yes. APIs.io lists 4 APIs from Blowfish, including Blowfish Download blocklist API, Blowfish Scan domain API and Blowfish Scan message API, and 1 more.

Is there an OpenAPI specification for the Blowfish API?

Yes. APIs.io indexes 4 OpenAPI specifications for Blowfish, each linked for download from this page.

How do I authenticate with the Blowfish API?

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

Is the Blowfish API ready for AI agents?

Blowfish has a Kin Score of 36.7 out of 100 (thin) and an Agent Readiness score of 30.5 (agent-ready), scored by API Evangelist on 2026-11-06.

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