Synthient API

Synthient provides IP enrichment, account management, and real-time data feeds for cybersecurity and fraud prevention. The platform offers residential proxies, VPNs, and anonymized IP data with streaming capabilities, usage limits, and comprehensive authentication via API keys.

Synthient API publishes 7 API contracts indexed on the APIs.io network, including Account API, Anonymizers API, Helios API, and 4 more. Tagged areas include Company, IP, Data Enrichment, Cybersecurity, and Data.

The Synthient API catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Synthient API’s developer surface includes CLI, authentication, pricing, engineering blog, documentation, API reference, getting-started guide, and 33 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

61.4/100 strong ▲ 9.5 Agent 34/100 agent ready Heartbeat 92/100 alive Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessPaid

1 published contract 1 MCP Servers 1 Agent Skills

Company IP Data Enrichment Cybersecurity Data

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

AnonymizersHeliosJA4TLookup

GET /feeds/helio/adb/stream GET /lookup/domain/{domain} GET /feeds/anonymizers/stream GET /feeds/ja4t/stream

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 61.4/100 · strong

Contract Quality 11.4 / 19

Developer Ergonomics 10.3 / 15

Access Clarity 9.6 / 15

Operational Transparency 5.6 / 10

Contract Governance 2.0 / 9

Discoverability 6.1 / 8

Regulatory Posture 4.6 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 34/100 · 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 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 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):

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) Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
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) Ask about this →
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks Ask about this →
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too Ask about this →

5 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 60.6 — up to +9.9 composite points Ask about this →
Contract Governance scores 22.0 — up to +9.4 composite points Ask about this →
Access Clarity scores 63.8 — up to +7.2 composite points Ask about this →

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.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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/synthient/apis.yml: open an issue on github.com/api-evangelist/synthient 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 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 (documented)

OpenAPI

measured — observed by APIs.io (published)

APIs 7

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

Synthient API Account API

Account info, quota, and the public health probe.

Synthient API Anonymizers API

VPN, Tor, and relay-class anonymizer IP ranges. One real-time stream and one parquet export.

Synthient API Helios API

Honeypot capture streams. Helios sensors record HTTP requests, TLS ClientHellos, and ADB shell commands from inbound traffic to our honeypot tunnels. Each protocol has its own r...

Synthient API JA4T API

JA4T TCP-layer fingerprint sightings attributed to source IPs with provider, country, and ASN enrichment. One real-time stream and one parquet export.

Synthient API Lookup API

Single-IP, batch-IP, and domain enrichment endpoints.

Synthient API Proxies API

Residential, datacenter, mobile, Tor, and VPN proxy IPs. One real-time stream and one parquet export.

Synthient API Torrents API

DHT and tracker peer observations. One real-time stream and one parquet export.

Scroll for all 7

MCP Servers 1

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

Synthient API MCP Server

MCP SERVER

Agent Skills 1

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

synthient-lookup-intelligence

AGENT SKILL

Synthient API pricing

Prices published by Synthient API, read 2026-10-28 from synthient.com/pricing.

Plan	Price
Lookup API Researcher	Custom quote Includes: API lookups / month 4M; Daily granularity; Lookup API
Feeds Startup	Custom quote Includes: API lookups / month 6M; Hourly granularity; Lookup API, Feeds
Firehose Real time Business	Custom quote Includes: API lookups / month 8M; Second granularity; Lookup API, Feeds, Firehose
Helios Enterprise	Custom quote Includes: Custom lookups and granularity; Lookup API, Feeds, Firehose, Helios

Plan details, limits and sources →

Rate limits

GET /lookup/ip/{ip} sustained: 100 req/sec
GET /lookup/ip/{ip} burst: 200
POST /lookup/ips sustained: 100 req/sec

All 14 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Synthient API Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Synthient API Rate Limits

14 limits

RATE LIMITS

Terms of Service 1

What its API terms permit and prohibit, quoted from its own page.

Synthient API

1 quoted statement, read from Synthient API's own page on 2026-11-10.

TERMS

Privacy & Data 1

Its role, the data it processes, retention and transfers, quoted from its own privacy page.

Synthient API

7 quoted statements, read from Synthient API's own page on 2026-11-10.

PRIVACY

Eligibility 1

Who may sign up and where, quoted from its own terms.

Synthient API

1 quoted statement, read from Synthient API's own page on 2026-11-10.

ELIGIBILITY

Data License 1

How its data and outputs may be reused, quoted from its own terms.

Synthient API

2 quoted statements, read from Synthient API's own page on 2026-11-10.

LICENSE

FinOps 1

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

Synthient API Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Synthient Context

42 classes · 128 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Synthient API API Rules

14 rules · 10 error-severity 3 warn-severity 1 info-severity

SPECTRAL

JSON Schema 7

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

AccountInfoResponse

7 properties

JSON SCHEMA

AnonymizerStreamEntry

7 properties

JSON SCHEMA

DomainLookupResponse

12 properties

JSON SCHEMA

HoneypotHTTPSStreamEntry

7 properties

JSON SCHEMA

JA4TStreamEntry

7 properties

JSON SCHEMA

ProxyStreamEntry

6 properties

JSON SCHEMA

TorrentStreamEntry

9 properties

JSON SCHEMA

Scroll for all 7

Security Posture 3

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

Synthient API Authentication

1 scheme

SECURITY

Synthient API Domain Security

TLSv1.3 · DMARC

SECURITY

Synthient API Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Synthient API Agentic Access

53 operations

53 operations · 0 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

MCPServer

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Build 4

SDKs, sample code, and the tooling you integrate with

CLI

CLI

ToolCrosswalk

ToolCrosswalk

SDK

SDK

GitHubOrganization

GitHubOrganization

Access & Security 5

Authentication, authorization, and security posture

Security

Security

Authentication

Authentication

SecurityTxt

SecurityTxt

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

StatusPage

StatusPage

Commercial 6

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

UsageTerms

DataLicense

Company 2

The organization behind the API

Blog

Blog

Website

Website

Other 6

Properties that don't map to a standard resource type

CapabilityMap

Hosts

Vendors

SocialX

DataProcessing

Eligibility

Source (apis.yml)

aid: synthient
name: Synthient API
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: high
  source:
  - plans
  - authentication
  - rate-limits
  - security
  generated: '2026-11-13'
  method: derived
image: https://synthient.com/og-image.png?v=20260624
description: Synthient provides IP enrichment, account management, and real-time data feeds for cybersecurity and fraud prevention.
  The platform offers residential proxies, VPNs, and anonymized IP data with streaming capabilities, usage limits, and comprehensive
  authentication via API keys.
url: https://raw.githubusercontent.com/api-evangelist/synthient/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-09-28 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-09-28'
modified: '2026-09-28'
tags:
- Company
- IP
- Data Enrichment
- Cybersecurity
- Data
tags_raw:
- Company
- IP
- Enrichment
- Cybersecurity
- Data
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: CapabilityMap
  url: capabilities/synthient-capability-edges.yml
  name: Synthient API Business Capability Map
- type: AgenticAccess
  url: agentic-access/synthient-agentic-access.yml
- type: RateLimits
  url: rate-limits/synthient-rate-limits.yml
- type: Plans
  url: plans/synthient-plans-pricing.yml
- type: Spectral
  url: rules/synthient-rules.yml
- type: JSONLD
  url: json-ld/synthient-context.jsonld
- type: Vocabulary
  url: vocabulary/synthient-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/synthient-data-model.yml
- type: CLI
  url: cli/synthient-cli.yml
- type: Security
  url: https://synthient.com/terms
- type: Authentication
  url: authentication/synthient-authentication.yml
- type: ErrorCatalog
  url: errors/synthient-problem-types.yml
- type: Conformance
  url: conformance/synthient-conformance.yml
- type: LLMsTxt
  url: llms/synthient-llms.txt
- type: ToolCrosswalk
  url: mcp/synthient-tool-crosswalk.yml
- type: MCPServer
  url: mcp/synthient-mcp.yml
- type: SecurityTxt
  url: well-known/synthient-security.txt
- type: WellKnown
  url: well-known/synthient-well-known.yml
- type: Hosts
  url: hosts/synthient-hosts.yml
- type: Vendors
  url: vendors/synthient-vendors.yml
- type: TermsOfService
  url: https://synthient.com/terms
- type: StatusPage
  url: https://synthient.com/status
- type: PrivacyPolicy
  url: https://synthient.com/privacy
- type: Pricing
  url: https://synthient.com/pricing
- type: Blog
  url: https://synthient.com/blog
- type: VulnerabilityDisclosure
  url: security/synthient-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/synthient-domain-security.yml
- type: Website
  url: https://synthient.com/
- type: Documentation
  url: https://docs.synthient.com/api
- type: DeveloperPortal
  url: https://docs.synthient.com/api
- type: APIReference
  url: https://docs.synthient.com/api
- type: GettingStarted
  url: https://docs.synthient.com/sdk
- type: SDK
  url: https://docs.synthient.com/sdk
- type: GitHubOrganization
  url: https://github.com/synthient
- type: SocialX
  url: https://x.com/synthient
- type: UsageTerms
  url: terms/synthient-terms-of-service.yml
- type: DataProcessing
  url: privacy/synthient-privacy-policy.yml
- type: Eligibility
  url: eligibility/synthient-eligibility.yml
- type: DataLicense
  url: data-license/synthient-data-license.yml
apis:
- aid: synthient:synthient-account-api
  name: Synthient API Account API
  description: Account info, quota, and the public health probe.
  humanURL: https://docs.synthient.com/api
  baseURL: https://api.synthient.com/api/v4
  tags:
  - Account
  properties:
  - type: OpenAPI
    url: openapi/synthient-account-api-openapi.yml
  - type: JSONSchema
    url: json-schema/synthient-account-info-response-schema.json
- aid: synthient:synthient-anonymizers-api
  name: Synthient API Anonymizers API
  description: VPN, Tor, and relay-class anonymizer IP ranges. One real-time stream and one parquet export.
  humanURL: https://docs.synthient.com/api
  baseURL: https://api.synthient.com/api/v4
  tags:
  - Anonymizers
  properties:
  - type: OpenAPI
    url: openapi/synthient-anonymizers-api-openapi.yml
  - type: JSONSchema
    url: json-schema/synthient-anonymizer-stream-entry-schema.json
- aid: synthient:synthient-helios-api
  name: Synthient API Helios API
  description: Honeypot capture streams. Helios sensors record HTTP requests, TLS ClientHellos, and ADB shell commands from
    inbound traffic to our honeypot tunnels. Each protocol has its own real-time stream and parquet export.
  humanURL: https://docs.synthient.com/api
  baseURL: https://api.synthient.com/api/v4
  tags:
  - Helios
  properties:
  - type: OpenAPI
    url: openapi/synthient-helios-api-openapi.yml
  - type: JSONSchema
    url: json-schema/synthient-honeypot-httpsstream-entry-schema.json
- aid: synthient:synthient-ja4t-api
  name: Synthient API JA4T API
  description: JA4T TCP-layer fingerprint sightings attributed to source IPs with provider, country, and ASN enrichment. One
    real-time stream and one parquet export.
  humanURL: https://docs.synthient.com/api
  baseURL: https://api.synthient.com/api/v4
  tags:
  - JA4T
  properties:
  - type: OpenAPI
    url: openapi/synthient-ja4t-api-openapi.yml
  - type: JSONSchema
    url: json-schema/synthient-ja4-tstream-entry-schema.json
- aid: synthient:synthient-lookup-api
  name: Synthient API Lookup API
  description: Single-IP, batch-IP, and domain enrichment endpoints.
  humanURL: https://docs.synthient.com/api
  baseURL: https://api.synthient.com/api/v4
  tags:
  - Lookup
  properties:
  - type: OpenAPI
    url: openapi/synthient-lookup-api-openapi.yml
  - type: JSONSchema
    url: json-schema/synthient-domain-lookup-response-schema.json
- aid: synthient:synthient-proxies-api
  name: Synthient API Proxies API
  description: Residential, datacenter, mobile, Tor, and VPN proxy IPs. One real-time stream and one parquet export.
  humanURL: https://docs.synthient.com/api
  baseURL: https://api.synthient.com/api/v4
  tags:
  - Proxies
  properties:
  - type: OpenAPI
    url: openapi/synthient-proxies-api-openapi.yml
  - type: JSONSchema
    url: json-schema/synthient-proxy-stream-entry-schema.json
- aid: synthient:synthient-torrents-api
  name: Synthient API Torrents API
  description: DHT and tracker peer observations. One real-time stream and one parquet export.
  humanURL: https://docs.synthient.com/api
  baseURL: https://api.synthient.com/api/v4
  tags:
  - Torrents
  properties:
  - type: OpenAPI
    url: openapi/synthient-torrents-api-openapi.yml
  - type: JSONSchema
    url: json-schema/synthient-torrent-stream-entry-schema.json
x-submission-notes: Public OpenAPI 3.0 at https://api.synthient.com/openapi.json. Root returns 403 to plain fetchers (bot
  protection); docs and openapi 200.
x-submission-probe: '2026-09-28: root 403 + invented 403 (bot-blocking), llms 200, openapi 200, docs 200'
x-enrichment:
  date: '2026-09-28'
  status: enriched
  artifacts_added: 25
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Synthient API — frequently asked questions

Does Synthient API have an API?

Yes. APIs.io lists 7 APIs from Synthient API, including Synthient API Account API, Synthient API Anonymizers API and Synthient API Helios API, and 4 more.

Is there an OpenAPI specification for the Synthient API?

Yes. APIs.io indexes 7 OpenAPI specifications for Synthient API, each linked for download from this page.

How do I authenticate with the Synthient API?

Synthient API uses bearer-token authentication (1 scheme). The details are profiled on APIs.io as Synthient API Authentication.

How much does the Synthient API cost?

Synthient API publishes its prices; its Lookup API Researcher plan is Custom quote as of 2026-10-28. APIs.io lists 4 pricing plans for Synthient API, with each plan's price, limits and inclusions under Pricing on this page.

Does Synthient API have an MCP server?

Yes. APIs.io lists 1 MCP server for Synthient API.

Is the Synthient API ready for AI agents?

Synthient API has a Kin Score of 61.4 out of 100 (strong) and an Agent Readiness score of 33.8 (agent-ready), scored by API Evangelist on 2026-11-13.

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apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
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