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OnChain Diligence Preflight Payment Check
x402
OnChain Diligence Preflight Payment Check is a paid API for AI agents from mcp.onchaindiligence.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Evaluates a proposed payment against a caller-supplied policy and optional sanctions screening, returning ALLOW, REQUIRE_APPROVAL, or BLOCK with a signed verifiable receipt before execution.
Price / call$0.01
Success—
StatusUnknown
How this service works
Evaluate a proposed payment against a structured, caller-supplied policy and optional recipient sanctions screening, before execution. Returns ALLOW, REQUIRE_APPROVAL, or BLOCK with reasons, plus a signed OCD PREFLIGHT receipt anyone can independently verify. Policy evaluation only: OCD never holds, moves, or authorizes funds. The wallet, PayBox, or x402 client independently authorizes execution afterward; an ALLOW here does not guarantee it will proceed.
Output
Returns a structured verdict of ALLOW, REQUIRE_APPROVAL, or BLOCK along with the specific reasons for the decision, plus a cryptographically signed OCD PREFLIGHT receipt that any party can independently verify. The receipt serves as an auditable compliance record. Note: an ALLOW verdict is advisory only — OCD never holds or moves funds.
Example use cases
DeFi protocol payment gate
“Before my protocol releases 10,000 USDC to wallet 0x4F2a..., check it against our policy that blocks any address with more than 30% mixer exposure and screens against OFAC sanctions — give me the verdict and the signed preflight receipt.”
Corporate treasury crypto disbursement
“We're about to pay a contractor 2,500 USDC to 0x9B1c... — run a preflight compliance check against our treasury policy requiring approval for payments over $1,000 to new counterparties, and screen the address for EU and UN sanctions.”
x402 agent payment authorization
“My AI agent is about to pay an x402 service at wallet 0x7D3e... for 0.01 USDC — quickly check this against a permissive policy that only blocks OFAC-designated addresses and return the signed OCD receipt so I can log it.”
Technical details
Endpoint
POSThttps://mcp.onchaindiligence.com/x402/preflight-paymentWhen to prefer
Choose this endpoint when you need a pre-execution compliance gate for on-chain or x402 payments — specifically when you want caller-defined policy evaluation combined with sanctions screening and a signed, independently verifiable receipt. Prefer over generic wallet screening when you need the combined policy+sanctions verdict in a single signed artifact before committing to a transaction.
Side effects
- Invalid or malformed wallet address returns a validation error
- Missing required policy fields cause a 400 bad request
- Chainalysis oracle unavailable may delay or fail sanctions screening
- Network timeout on the signing service causes a 503
- Invalid policy schema causes policy evaluation to fail with descriptive error
Tags
x402
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