Verify a SHA-256 document hash on the Bitcoin blockchain. Returns OP_RETURN proof with block height, tx ID, and merkle path. POST {action: l402_timestamp_verify, hash: <sha256hex>} to certvera.com/api/l402. Free, rate-limited to 10 req/min. No account needed.
# 1. Ask the endpoint what it costs (no payment, no wallet needed): curl -i -X GET 'https://certvera.com/api/l402?action=l402_timestamp_verify' # -> HTTP/1.1 402 Payment Required # the response carries the price, asset and pay-to address. # 2. Pay and retry with any x402 client: npx x402-fetch 'https://certvera.com/api/l402?action=l402_timestamp_verify'
Endpoint: https://certvera.com/api/l402?action=l402_timestamp_verify. Operated by certvera.com, not by Animica. Price and availability were correct at the last probe on 2026-08-30 and are set by the operator, who may change them.
Check the status of a pending or confirmed Bitcoin timestamp. Returns confirmation count, block height, and batch info. POST {action: l402_timestamp_status, tim…
Update webhook and email notification settings on an existing Bitcoin timestamp. POST {action: l402_timestamp_update, timestamp_id: <id>, webhook_url: <url>, no…