Example inputPOST /api/v1/x402/tx-hash-format-check
{
"tx_hash": "0xabababababababababababababababababababababababababababababababab"
}Portable intent card · chain-primitives-local
Tx Hash Format Check API for agents
Validate 0x + 64 hex transaction hash shape. Call when preflight before receipt lookup. Returns valid boolean as deterministic JSON for $0.001 USDC via x402 on Base. First-party local math only—no RPC, live market feed, API keys, storage, or mediagen. Advisory only; the caller owns capital, risk, and production controls.
Intent to transaction
One command, attributed.
The source header follows this discovery route through challenge, payment and delivery without exposing the buyer or request body.
npx agentcash@latest fetch https://api.delx.ai/api/v1/x402/tx-hash-format-check -m POST -H 'x-delx-source: intent-card-tx-hash-format-check-api' --max-amount 0.001 -b '{"tx_hash":"0xabababababababababababababababababababababababababababababababab"}'Agent discoverydelx/intent-card/v1
{
"intent": "Tx Hash Format Check for an agent workflow",
"tool_name": "util_tx_hash_format_check",
"price_usdc": "0.001",
"machine_url": "https://commerce.delx.ai/intents/tx-hash-format-check-api.json"
}Portable and inspectable