Example inputPOST /api/v1/x402/evm-nonce-replace-check
{
"pending_nonces": [
10,
11,
12
],
"proposed_nonce": 11
}Portable intent card · chain-primitives-local
EVM Nonce Replace Check API for agents
EVM Nonce Replace Check: EVM Nonce Replace Check checks whether a proposed nonce targets a caller-supplied pending nonce from bounded caller-supplied values without an external provider. Call EVM Nonce Replace Check before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Nonce Replace Check as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-party, stateless, memory-only execution with no paid upstream, live RPC, web search, credentials, custody, signing, media generator, or input retention. Honest limit: Uses caller-supplied values only; it performs no RPC call, signing, broadcasting, balance lookup, custody, trading, or live-chain claim. Advisory output only; the buyer owns authorization, payment policy, and production decisions.
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/evm-nonce-replace-check -m POST -H 'x-delx-source: intent-card-evm-nonce-replace-check-api' --max-amount 0.001 -b '{"pending_nonces":[10,11,12],"proposed_nonce":11}'Agent discoverydelx/intent-card/v1
{
"intent": "EVM Nonce Replace Check for an agent workflow",
"tool_name": "util_evm_nonce_replace_check",
"price_usdc": "0.001",
"machine_url": "https://commerce.delx.ai/intents/evm-nonce-replace-check-api.json"
}Portable and inspectable