Counterparty Check

Counterparty Check, operated by CHT Web, LLC, is a pre-payment counterparty risk API for AI agents: one call before money moves screens a payee against OFAC SDN and consolidated sanctions lists (including listed crypto wallets), detects lookalike vendor, executive and brand impersonation domains, checks domain age and email authentication, validates routing numbers, IBANs, SWIFT/BIC and wallet checksums, and flags invoice-fraud and bank-detail-change patterns. It returns a proceed, review or block verdict with reasons and a signed receipt, and is offered as a REST API (POST /v1/check, /v1/screen, /v1/receipts/verify) and a remote MCP server, paid per call via x402/MPP in USDC on Base or with a prepaid API key.

Counterparty Check publishes 6 API contracts indexed on the APIs.io network, including Account API, Check API, MCP API, and 3 more. Tagged areas include Company, Payments, Fraud Prevention, Sanctions Screening, and Compliance.

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

Counterparty Check’s developer surface includes authentication, documentation, pricing, support, and 31 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

45.7/100 developing Agent 30/100 agent ready Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract 1 MCP Servers 2 Agent Skills

Company Payments Fraud Prevention Sanctions Screening Compliance AI Agents MCP x402Know Your Counterparty

Kin Score

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

Composite quality — 45.7/100 · developing

Contract Quality 10.1 / 19

Developer Ergonomics 4.2 / 15

Access Clarity 9.9 / 15

Operational Transparency 2.6 / 10

Contract Governance 3.2 / 9

Discoverability 5.1 / 8

Regulatory Posture 2.6 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 30/100 · 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 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) 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):

Developer Ergonomics scores 28.0 — up to +14.4 composite points Ask about this →
Contract Quality scores 53.9 — up to +11.5 composite points Ask about this →
Operational Transparency scores 26.2 — up to +9.6 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.

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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/counterpartycheck-com/apis.yml: open an issue on github.com/api-evangelist/counterpartycheck-com 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 6

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

Counterparty Check Account API

The Account API from Counterparty Check — 1 operation(s) for account.

Counterparty Check Check API

The Check API from Counterparty Check — 1 operation(s) for check.

Counterparty Check MCP API

The Mcp API from Counterparty Check — 1 operation(s) for mcp.

Counterparty Check Pricing API

The Pricing API from Counterparty Check — 1 operation(s) for pricing.

Counterparty Check Receipts API

The Receipts API from Counterparty Check — 1 operation(s) for receipts.

Counterparty Check Screen API

The Screen API from Counterparty Check — 1 operation(s) for screen.

MCP Servers 1

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

Counterparty Check MCP Server

Remote MCP server at counterpartycheck.com requiring an API key; 4 tools listed.

MCP SERVER

Agent Skills 2

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

check-a-payee-before-paying

AGENT SKILL

screen-a-payee-for-sanctions

AGENT SKILL

Counterparty Check API pricing

Prices published by Counterparty Check. A free plan or tier is listed.

Plan	Price
Full check	$0.25
Sanctions screen	$0.05
Receipt verification	Free
Starter	$25
Growth	$100
Scale	$500

Plan details, limits and sources →

Rate limits

MCP screen_sanctions without an API key: screen_sanctions works without a key for 3 free screens per day

Rate-limit details →

Pricing Plans 1

Published pricing tiers and plan structures.

Counterparty Check Plans Pricing

6 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Counterparty Check Rate Limits

1 limits

RATE LIMITS

Terms of Service 1

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

Counterparty Check

9 quoted statements, read from Counterparty Check's own page on 2026-11-09.

TERMS

Privacy & Data 1

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

Counterparty Check

14 quoted statements, read from Counterparty Check's own page on 2026-11-09.

PRIVACY

Eligibility 1

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

Counterparty Check

1 quoted statement, read from Counterparty Check's own page on 2026-11-09.

ELIGIBILITY

AI Preferences 1

Its stance on AI training, inference and agents, quoted from its own pages.

Counterparty Check

1 quoted statement, read from Counterparty Check's own page on 2026-11-09.

AI PREFS

Data License 1

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

Counterparty Check

1 quoted statement, read from Counterparty Check's own page on 2026-11-09.

LICENSE

Semantic Vocabularies 1

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

Counterpartycheck Com Context

2 classes · 15 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.

Counterparty Check API Rules

30 rules · 28 error-severity 1 warn-severity 1 info-severity

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.

Counterparty Check Openapi Overlay

7 actions · documentation · counterpartycheck-com-openapi.yml

DERIVED

JSON Schema 1

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

CheckRequest

3 properties

JSON SCHEMA

Security Posture 2

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

Counterparty Check Authentication

3 schemes

SECURITY

Counterparty Check Domain Security

TLSv1.3

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Counterparty Check Agentic Access

6 operations · 4 acting

AGENTIC

Resources

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

Guides

Guides

AIPreferences

AIPreferences

Agent Surfaces 6

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

MCPServer

WellKnown

LLMsTxt

Design & Contract 8

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conventions

Lifecycle

ErrorCatalog

Conformance

Scroll for all 8

Build 1

SDKs, sample code, and the tooling you integrate with

ToolCrosswalk

ToolCrosswalk

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 3

Status, limits, changes, and where to get help

RateLimits

RateLimits

Deprecation

Deprecation

Support

Support

Commercial 6

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

UsageTerms

DataLicense

Company 1

The organization behind the API

Website

Website

Other 5

Properties that don't map to a standard resource type

Overlay

Hosts

RefundPolicy

DataProcessing

Eligibility

Source (apis.yml)

aid: counterpartycheck-com
name: Counterparty Check
description: 'Counterparty Check, operated by CHT Web, LLC, is a pre-payment counterparty risk API for AI agents: one call
  before money moves screens a payee against OFAC SDN and consolidated sanctions lists (including listed crypto wallets),
  detects lookalike vendor, executive and brand impersonation domains, checks domain age and email authentication, validates
  routing numbers, IBANs, SWIFT/BIC and wallet checksums, and flags invoice-fraud and bank-detail-change patterns. It returns
  a proceed, review or block verdict with reasons and a signed receipt, and is offered as a REST API (POST /v1/check, /v1/screen,
  /v1/receipts/verify) and a remote MCP server, paid per call via x402/MPP in USDC on Base or with a prepaid API key.'
url: https://artifacts.apis.io/counterpartycheck-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-04 (modular-v1; was harvest)
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
  probe_state: covered
  source:
  - plans
  - authentication
  - rate-limits
  - security
  generated: '2026-11-13'
  method: derived
specificationVersion: '0.20'
created: '2026-11-04'
modified: '2026-11-04'
tags:
- Company
- Payments
- Fraud Prevention
- Sanctions Screening
- Compliance
- AI Agents
- MCP
- x402
- Know Your Counterparty
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/counterpartycheck-com-agentic-access.yml
- type: RateLimits
  url: rate-limits/counterpartycheck-com-rate-limits.yml
- type: Plans
  url: plans/counterpartycheck-com-plans-pricing.yml
- type: Spectral
  url: rules/counterpartycheck-com-rules.yml
- type: JSONLD
  url: json-ld/counterpartycheck-com-context.jsonld
- type: Vocabulary
  url: vocabulary/counterpartycheck-com-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/counterpartycheck-com-data-model.yml
- type: Conventions
  url: conventions/counterpartycheck-com-conventions.yml
- type: Authentication
  url: authentication/counterpartycheck-com-authentication.yml
- type: Deprecation
  url: lifecycle/counterpartycheck-com-lifecycle.yml
- type: Lifecycle
  url: lifecycle/counterpartycheck-com-lifecycle.yml
- type: ErrorCatalog
  url: errors/counterpartycheck-com-problem-types.yml
- type: Conformance
  url: conformance/counterpartycheck-com-conformance.yml
- type: Overlay
  url: overlays/counterpartycheck-com-openapi-overlay.yaml
- type: LLMsTxt
  url: llms/counterpartycheck-com-llms.txt
- type: ToolCrosswalk
  url: mcp/counterpartycheck-com-tool-crosswalk.yml
- type: MCPServer
  url: mcp/counterpartycheck-com-mcp.yml
- type: WellKnown
  url: well-known/counterpartycheck-com-well-known.yml
- type: Hosts
  url: hosts/counterpartycheck-com-hosts.yml
- type: DomainSecurity
  url: security/counterpartycheck-com-domain-security.yml
- type: Website
  url: https://counterpartycheck.com/
- type: Documentation
  url: https://counterpartycheck.com/docs
- type: Guides
  url: https://counterpartycheck.com/guides
- type: Pricing
  url: https://counterpartycheck.com/#pricing
- type: LLMsTxt
  url: https://counterpartycheck.com/llms.txt
- type: TermsOfService
  url: https://counterpartycheck.com/terms
- type: PrivacyPolicy
  url: https://counterpartycheck.com/privacy
- type: RefundPolicy
  url: https://counterpartycheck.com/refunds
- type: Support
  url: mailto:chtwebllc@gmail.com
- type: UsageTerms
  url: terms/counterpartycheck-com-terms-of-service.yml
- type: DataProcessing
  url: privacy/counterpartycheck-com-privacy-policy.yml
- type: Eligibility
  url: eligibility/counterpartycheck-com-eligibility.yml
- type: AIPreferences
  url: ai-preferences/counterpartycheck-com-ai-preferences.yml
- type: DataLicense
  url: data-license/counterpartycheck-com-data-license.yml
apis:
- aid: counterpartycheck-com:counterpartycheck-com-account-api
  name: Counterparty Check Account API
  description: The Account API from Counterparty Check — 1 operation(s) for account.
  humanURL: https://counterpartycheck.com/docs
  baseURL: https://counterpartycheck.com
  tags:
  - Account
  properties:
  - type: OpenAPI
    url: openapi/counterpartycheck-com-account-api-openapi.yml
  - type: Documentation
    url: https://counterpartycheck.com/docs
- aid: counterpartycheck-com:counterpartycheck-com-check-api
  name: Counterparty Check Check API
  description: The Check API from Counterparty Check — 1 operation(s) for check.
  humanURL: https://counterpartycheck.com/docs
  baseURL: https://counterpartycheck.com
  tags:
  - Check
  properties:
  - type: OpenAPI
    url: openapi/counterpartycheck-com-check-api-openapi.yml
  - type: Documentation
    url: https://counterpartycheck.com/docs
  - type: JSONSchema
    url: json-schema/counterpartycheck-com-check-request-schema.json
- aid: counterpartycheck-com:counterpartycheck-com-mcp-api
  name: Counterparty Check MCP API
  description: The Mcp API from Counterparty Check — 1 operation(s) for mcp.
  humanURL: https://counterpartycheck.com/docs
  baseURL: https://counterpartycheck.com
  tags:
  - MCP
  tags_raw:
  - Mcp
  properties:
  - type: OpenAPI
    url: openapi/counterpartycheck-com-mcp-api-openapi.yml
  - type: Documentation
    url: https://counterpartycheck.com/docs
- aid: counterpartycheck-com:counterpartycheck-com-pricing-api
  name: Counterparty Check Pricing API
  description: The Pricing API from Counterparty Check — 1 operation(s) for pricing.
  humanURL: https://counterpartycheck.com/docs
  baseURL: https://counterpartycheck.com
  tags:
  - Pricing
  properties:
  - type: OpenAPI
    url: openapi/counterpartycheck-com-pricing-api-openapi.yml
  - type: Documentation
    url: https://counterpartycheck.com/docs
- aid: counterpartycheck-com:counterpartycheck-com-receipts-api
  name: Counterparty Check Receipts API
  description: The Receipts API from Counterparty Check — 1 operation(s) for receipts.
  humanURL: https://counterpartycheck.com/docs
  baseURL: https://counterpartycheck.com
  tags:
  - Receipts
  properties:
  - type: OpenAPI
    url: openapi/counterpartycheck-com-receipts-api-openapi.yml
  - type: Documentation
    url: https://counterpartycheck.com/docs
- aid: counterpartycheck-com:counterpartycheck-com-screen-api
  name: Counterparty Check Screen API
  description: The Screen API from Counterparty Check — 1 operation(s) for screen.
  humanURL: https://counterpartycheck.com/docs
  baseURL: https://counterpartycheck.com
  tags:
  - Screen
  properties:
  - type: OpenAPI
    url: openapi/counterpartycheck-com-screen-api-openapi.yml
  - type: Documentation
    url: https://counterpartycheck.com/docs
  - type: JSONSchema
    url: json-schema/counterpartycheck-com-check-request-schema.json
x-coverage:
  state: covered
  reason: identity-verified
  detail: Name, description and pointers read from counterpartycheck.com (title "Counterparty Check", terms name operator
    CHT Web, LLC). No logo/og:image published, so image left unset.
  evidence:
  - url: https://counterpartycheck.com/
    status: 200
  - url: https://counterpartycheck.com/docs
    status: 200
  - url: https://counterpartycheck.com/guides
    status: 200
  - url: https://counterpartycheck.com/llms.txt
    status: 200
  - url: https://counterpartycheck.com/terms
    status: 200
  - url: https://counterpartycheck.com/privacy
    status: 200
  - url: https://counterpartycheck.com/refunds
    status: 200
  - url: https://counterpartycheck.com/favicon.ico
    status: 404
x-enrichment:
  date: '2026-11-04'
  status: enriched
  artifacts_added: 33
  pass: modular-v1
  engine: identity=anthropic,contract=anthropic,surfaces=anthropic,docs=anthropic,regulatory=anthropic

Counterparty Check API — frequently asked questions

Does Counterparty Check have an API?

Yes. APIs.io lists 6 APIs from Counterparty Check, including Counterparty Check Account API, Counterparty Check Check API and Counterparty Check MCP API, and 3 more.

Is there an OpenAPI specification for the Counterparty Check API?

Yes. APIs.io indexes 6 OpenAPI specifications for Counterparty Check, each linked for download from this page.

How do I authenticate with the Counterparty Check API?

Counterparty Check uses bearer-token authentication (3 schemes). The details are profiled on APIs.io as Counterparty Check Authentication.

How much does the Counterparty Check API cost?

Counterparty Check publishes its prices; its Full check plan is $0.25 as of 2026-11-04. APIs.io lists 6 pricing plans for Counterparty Check, with each plan's price, limits and inclusions under Pricing on this page.

Does Counterparty Check have an MCP server?

Yes. APIs.io lists 1 MCP server for Counterparty Check: Remote MCP server at counterpartycheck.com requiring an API key; 4 tools listed.

Is the Counterparty Check API ready for AI agents?

Counterparty Check has a Kin Score of 45.7 out of 100 (developing) and an Agent Readiness score of 29.5 (agent-ready), scored by API Evangelist on 2026-11-13.

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