Didit Transaction Monitoring & Travel Rule API

Overview

Scores every transaction in real time against a rule engine (conditions, velocity windows, blocklists), screens crypto wallets and transaction hashes against blockchain analytics, and runs the FATF / EU TFR Travel Rule exchange with counterparty VASPs.

Key facts:

• POST /v3/transactions/ is synchronous: screening, Travel Rule routing and rules all run inside the call, so the 201 response already carries the verdict. A transaction is created APPROVED; rules may move it to IN_REVIEW, DECLINED or AWAITING_USER.
• transaction_id is unique per application. Reusing it is rejected (400 with {"transaction_id": "A transaction with this transaction_id already exists."}, or 409 when two requests race); the existing transaction is never returned. After a timeout, treat that 400 as "already created" and find the record in GET /v3/transactions/ instead of resubmitting.
• GET /v3/transactions/{uuid}/ takes Didit's uuid from the create response, not your transaction_id.
• Sandbox applications store transactions but skip rules, crypto screening, webhooks and billing (they stay APPROVED).
• Non-monetary activity (logins, gameplay, bonuses, chargebacks) goes to the events API: see the didit-event-monitoring skill.

Pricing: $0.02 per transaction (Transaction Screening); a Travel Rule transfer is billed $0.02 per outbound transfer on its own line instead of the screening fee, never both; Wallet Verification & Screening (transaction-coupled or on-demand) from $0.15 with Didit-managed analytics, $0.02 with your own provider key, charged once even when Travel Rule attribution needs the same lookup. Sandbox is never billed. These are the list prices until 1 November 2026, when Didit pricing changes and the 500 free checks a month become $10 of free credit a month. Check didit.me/pricing for current prices.

API Reference: https://docs.didit.me/management-api/transactions/create Feature guides: https://docs.didit.me/transaction-monitoring/overview | https://docs.didit.me/transaction-monitoring/rules-api | https://docs.didit.me/transaction-monitoring/travel-rule | https://docs.didit.me/transaction-monitoring/wallet-screening