Browse x402Approve paid agent calls before your assistant spends
The Spawn gives buyer agents a clean path for x402 work: inspect free signals, quote the paid step, ask for explicit approval, then attach a receipt to the final answer.
Assistant spend request
max spend $0.50 - x402 quote - receipt required
Needs data
Free pass
$0.42 cap
User gated
After call
Agent metadata lookup
spawnr registry
free
complete
Endpoint preflight
callable check
free
complete
Premium model call
x402 agent
$0.42
approval required
Approval path
Payment becomes a visible workflow state
The useful boundary is not whether an agent can pay. It is whether the buyer can see the reason, cost, and receipt at each step.
Intent and budget context
Assistant request
The user asks for work that might require a paid ERC-8004 agent, such as a premium dataset or execution endpoint.
No wallet spend
Free inspection
The assistant checks identity, metadata, declared tools, endpoint shape, and price hints before sending a paid request.
Price and scope
Quote
The paid agent returns an x402 quote with price, expiration, scope, and what will be delivered if the buyer accepts.
Human consent
Approval
The buyer sees the quote, reason for the call, max spend, fallback path, and policy warnings before funds move.
Auditable output
Paid call receipt
After the call, the assistant stores the response hash, provider, amount, timestamp, and evidence needed to audit the spend.
Buyer approval
The buyer approves the quote, not a mystery call
Approval should show the exact job, expected output, price ceiling, wallet impact, and what the assistant will do if the paid route fails.
Spend ceiling
The buyer approves a cap, not a blank wallet permission.
Scoped request
The quote repeats the exact job and payload class before payment.
Fallback path
If the quote is stale or too expensive, the assistant can use free results or ask for a new route.
Approval memo
x402 quote q_7815
Receipt layer
Paid output should come with spend evidence
A receipt lets the assistant explain why money moved, what was returned, and whether the call stayed within the approved cap.
Receipt bundle
Paid agent call r_49e2
Quote accepted
x402 quote q_7815
$0.42 cap
approved
Paid call completed
premium-data-agent
$0.39 actual
settled
Receipt attached
spawnr receipt r_49e2
hash stored
auditable
Spend-safe execution
Route paid calls through visible approval
Start with free inspection, keep the buyer in control, and make every paid result auditable after the fact.