Portable intent card · api-integration
Evaluate caller-supplied x402 payment requirements before a wallet signs them. Use after receiving HTTP 402 to enforce a maximum USDC amount, allowed networks, exact scheme, recipient presence, and an optional expiry buffer. Returns eligible accepts and explicit blockers for $0.002 USDC via x402 on Base; it never signs, pays, stores, or echoes a payment signature.
Intent to transaction
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/payment-preflight -m POST -H 'x-delx-source: intent-card-x402-payment-preflight-api' --max-amount 0.002 -b '{"requirements":{"accepts":[{"scheme":"exact","network":"eip155:8453","amount":"1000","payTo":"0x1111111111111111111111111111111111111111","expires":1786272600}]},"max_amount_usdc":0.002,"allowed_networks":["eip155:8453"],"now_epoch_seconds":1786272500}'{
"requirements": {
"accepts": [
{
"scheme": "exact",
"network": "eip155:8453",
"amount": "1000",
"payTo": "0x1111111111111111111111111111111111111111",
"expires": 1786272600
}
]
},
"max_amount_usdc": 0.002,
"allowed_networks": [
"eip155:8453"
],
"now_epoch_seconds": 1786272500
}{
"intent": "x402 Payment Preflight for an agent workflow",
"tool_name": "util_x402_payment_preflight",
"price_usdc": "0.002",
"machine_url": "https://commerce.delx.ai/intents/x402-payment-preflight-api.json"
}Portable and inspectable