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First Dollar Desk Agent Verify
x402
First Dollar Desk Agent Verify is a paid API for AI agents from first-dollar-desk.undone-k.workers.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-12).
Verifies third-party x402 micropayments for agent API access, rejecting self-pay (owner/smoke) transactions and accepting only legitimate paid settlements
Price / call$0.05
Success—
StatusUnknown
How this service works
Third-party $1 human checkout and $1 agent 402. Owner and smoke payments are rejected.
Output
Returns a JSON object with a 'verified' boolean (false if self-pay/smoke/owner, true if legitimate third-party settlement) and a 'note' string explaining the outcome, e.g. 'Paid settlement accepted. Self-pay is rejected.'
Example use cases
Gate agent API behind verified payment
“Before serving the response to this AI agent, verify that the x402 payment it sent was made by a real third-party payer and isn't just the owner testing their own endpoint — reject it if it looks like a smoke or self-pay.”
Block owner wallet from bypassing paywall
“I want to make sure my own wallet can't accidentally satisfy the payment check on my API — can you run the x402 verification and confirm that owner-originated payments get rejected as expected?”
Audit payment legitimacy for monetized agent tool
“Run a payment legitimacy check on the x402 settlement attached to this agent request and tell me whether it was accepted as a paid third-party transaction or flagged as self-pay.”
Technical details
Endpoint
GEThttps://first-dollar-desk.undone-k.workers.dev/api/agent/verify?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to enforce third-party-only payment validation in an x402 monetized API flow — specifically when you want to prevent the API owner or test wallets from self-satisfying the payment gate. It is purpose-built for the x402 protocol's human checkout and agent 402 patterns and explicitly blocks smoke payments, making it more trustworthy than a generic payment passthrough for production agent monetization.
Side effects
- Self-pay or owner wallet detected — returns verified: false with rejection note
- Smoke/test payment detected — returns verified: false
- Missing or malformed input type/method fields — likely 400 error
- Payment proof not present or unrecognizable — verification fails
- Network timeout connecting to the worker endpoint
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"note": "Paid settlement accepted. Self-pay is rejected.",
"verified": false
}
}Tags
x402
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