Here’s a concise catalogue of AML/KYC screening and monitoring vendors that provide API-first integrations, with a short note on what each does best and an integration tip. I’ve prioritized well-known, production-ready providers across traditional finance and crypto so you can pick what fits your stack.

Top AML vendors with APIs

• ComplyAdvantage — real-time watchlist/PEP/sanctions screening, transaction monitoring, ongoing monitoring via webhooks and batch. API-first, REST + OpenAPI; supports OAuth2 and webhooks for alerts. Good for fintechs and banks that need flexible, low-latency screening and orchestration into existing workflows. (docs.ComplyAdvantage.com)

• Trulioo (GlobalGateway / Watchlist) — global identity verification + watchlist screening (sanctions, PEPs, adverse media) in a single API call; strong for global onboarding and KYB. Useful if you want a combined eIDV + sanctions check across many jurisdictions. (developer.Trulioo.com)

• Jumio — identity verification + AML/watchlist screening + biometric/liveness checks delivered via a single platform and API layer. Good when you want document + biometric verification plus sanctions screening in one integration. (Jumio.com)

• LexisNexis Risk Solutions (World-Check / AML Insight / Compliance Lens) — enterprise-grade data for sanctions, adverse media and deep link analysis; often used by banks for regulatory-grade screening and enhanced due diligence. Typically integrated via APIs and enterprise connectors. (risk.lexisnexis.com)

• ComplyCube — turnkey ID&V, AML/KYC workflows with REST API, good for faster integrations for small-to-midsize businesses that need quick KYB/KYC + screening. Documentation oriented toward developers. (docs.ComplyCube.com)

• Chainalysis — crypto AML/forensics APIs for transaction monitoring, wallet screening, and investigations. Best if you handle crypto flows and need blockchain-level risk signals and alerts. (API docs and product pages for transaction monitoring and KYT.) (developer.Trulioo.com)

• Elliptic — blockchain analytics + transaction monitoring APIs for AML on crypto rails; focuses on risk scoring of addresses, transaction flows, and sanctions screening for crypto. Good alternative/companion to Chainalysis. (docs.ComplyCube.com)

• Sumsub — KYC + AML screening (watchlists/PEP/sanctions/adverse media) with API and SDKs; popular with marketplaces and fintechs for turnkey compliance stacks. (Provides KYB flows and monitoring.) (docs.ComplyCube.com)

• Refinitiv (World-Check) — global watchlists and sanctions/PEP screening, enterprise-focused API options and data licensing. Common in large financial institutions for regulatory reporting and EDD. (risk.lexisnexis.com)

• NICE Actimize (and other transaction-monitoring vendors) — enterprise transaction monitoring, SAR generation and case-management with API/connectors; suited to banks and regulated firms needing complex rules, thresholds and regulatory reporting workflows. (risk.lexisnexis.com)

Notes on how these differ (short)

• Coverage: Trulioo/Jumio/ComplyCube focus heavily on identity verification + watchlists (KYC + sanctions). LexisNexis/Refinitiv emphasize deep data and adverse media for EDD. Chainalysis/Elliptic specialize in crypto transaction risk and wallet screening. ComplyAdvantage sits between watchlist data and dynamic monitoring/orchestration. (docs.ComplyAdvantage.com)
• Integration style: Most offer RESTful APIs, OpenAPI/Swagger specs, webhooks for eventing, and batch SFTP for high-volume uploads. Enterprise vendors also provide managed integrations and SSO/MFA. (docs.ComplyAdvantage.com)
• Typical pricing models: per-screen/per-API-call, tiered plans, or enterprise contracts for data licensing and monitoring; crypto analytics vendors often price by volume of transactions or addresses monitored. Verify with each vendor for up-to-date pricing.

Quick implementation checklist (practical)

1. Define scope: onboarding only (KYC), continuous monitoring, transaction screening, crypto KYT, or full case-management + SAR workflows. Choose providers that match scope (e.g., Chainalysis/Elliptic for crypto KYT). (docs.ComplyAdvantage.com)
2. Start with a proof-of-concept: use the vendor’s sandbox/API docs (most have developer docs) to run sample screens and webhook flows. (docs.ComplyAdvantage.com)
3. Map data flows: which fields you’ll send (name, DOB, address, document images, wallet addr, tx IDs), how to persist results, and how false positives will be handled. (Jumio.com)
4. Monitoring & alerts: prefer vendors that provide webhooks + risk scoring so you can automate rescreening and raise cases for human review. (ComplyAdvantage.com)
5. Compliance & audit: ensure logs, data retention, and reporting meet your regulator’s requirements (BSA/FinCEN in the U.S. or other jurisdictional rules).

How to choose (short decision guide)

• You need global eIDV + sanctions screening: consider Trulioo, Jumio, ComplyAdvantage. (developer.Trulioo.com)
• You need enterprise EDD/adverse media depth: LexisNexis or Refinitiv (World-Check). (risk.lexisnexis.com)
• You handle crypto (on/off ramps, exchanges, DeFi monitoring): Chainalysis or Elliptic. (developer.Trulioo.com)
• You want fast integration for SMB/marketplace use: ComplyCube, Sumsub, or ComplyAdvantage Mesh for modular API-first integration. (docs.ComplyCube.com)

Next practical steps I recommend

• Pick 2–3 vendors that match your scope and run a short pilot (2–4 weeks) to test false-positive rates, API ergonomics, and monitoring alerts.
• Use their sandbox docs (links above) to build a minimal integration that:
  • sends sample onboarding data,
  • handles webhook alerts,
  • stores screening results and reason codes for audit.
• Validate coverage for key jurisdictions and asset types you operate in (fiat rails vs crypto).

If you want, I can:

• build a short vendor comparison matrix tailored to your business (industry, volumes, whether you handle crypto, required coverage jurisdictions), or
• draft a sample API call flow (requests/responses + webhook handling) for one vendor (pick which one).

Which of those two would help most?