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ZERO Payment Guard

● LiveVerification

beacon.host

Copies a prompt for your agent.

Read-only payment safety checks for agents on Base: verify a tx paid native Circle USDC to a recipient ($0.002), and preflight any x402 endpoint before paying - asset is canonical Circle USDC, price/scheme/timeout sanity, payTo contract/balance ($0.005). Free samples at /sample/*.

Claim this service
Price
$0.002
Asked in its payment challenge
Chain
Base
Paid in
USDC
Live
2 of 2 checks

Endpoints

GEThttps://zero-payment-guard.worker.beacon.host/v1/usdc-payment

Verify a Base mainnet tx paid native Circle USDC to a recipient: amount, sender, confirmations, flags bridged USDbC. Use before releasing goods or marking an invoice paid. $0.002 asked in its payment challenge on 13 Nov 2026

  • txquery, required0x1d58cdf015648f986dadf941e30fdd4c2947862302c2bead79d58a5d8f399d20Base mainnet transaction hash
  • toquery0x72ab388e2e2f6facef59e3c3fa2c4e29011c2d38Expected recipient address (optional)
  • minquery1Minimum USDC amount, decimal (optional)
  • minConfirmationsquery3Required confirmations, default 1
curl -i 'https://zero-payment-guard.worker.beacon.host/v1/usdc-payment?tx=0x1d58cdf015648f986dadf941e30fdd4c2947862302c2bead79d58a5d8f399d20&to=0x72ab388e2e2f6facef59e3c3fa2c4e29011c2d38&min=1&minConfirmations=3'
1 more endpoint · on x402-list.com

Checks and payment terms on this page refer to the first endpoint's example. Other endpoints have not been checked individually.

  • GEThttps://zero-payment-guard.worker.beacon.host/v1/x402-preflight$0.005Preflight an x402 endpoint before paying: fetches its 402 unpaid, checks the asset is Circle-issued USDC for that network, price sanity, scheme, timeout, and payTo (contract or EOA, USDC balance on Base). Returns ok / caution / block.
    Example
    curl -i 'https://zero-payment-guard.worker.beacon.host/v1/x402-preflight'

A dash means the listing gives no price or method. {Braces} mark a value you fill in. Copy buttons copy an example URL.

Agents can find it through the Superstables MCP server and JSON API: GET /api/v1/services/zero-payment-guard.worker.beacon.host

Recent checks

13 Nov 2026Taller is slower; grey is not live.13 Nov 2026
Median response
926 ms
Last checked
13 Nov, 21:23 UTC

Our probes look for a payment challenge. They don't test payment or delivery.

All 2 checks
When (UTC)ResultHTTPResponse
13 Nov, 21:23 UTCLive402531ms
13 Nov, 18:25 UTCLive4021320ms

Questions

Did our last probe detect a payment challenge?

At our last probe on 13 Nov, 21:23 UTC, it returned HTTP 402 or another detected payment-challenge signal.

What payment terms does ZERO Payment Guard advertise?

The listing advertises x402, Base and USDC. Check the seller's current payment challenge and authentication requirements before paying.

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