ARN · Payment security for autonomous agents

Check the seller before you pay.

ARN x402 PayGuard verifies the payment challenge, recipient, authorization, and execution path before an autonomous agent spends money.

$0.001 / CHECKX402 V2BASE + SOLANAUSDCLIVE
DISCOVERABLE VIA COINBASE · AGENT402 · X402SCAN
ServiceLIVE
Paid calls000031
Unique buyers000009
Revenue USDC$0.031000
Security coverage

What ARN checks

Specialist payment-security checks for the moment an autonomous agent is deciding whether to pay an x402 seller.

01

Challenge Integrity

Detect malformed, conflicting, mutated, or inconsistent x402 payment requirements.

02

Spend Protection

Verify price, intended-spend ceiling, network, and canonical asset.

03

Recipient Safety

Inspect the payment recipient and distinguish EOA, contract, or unavailable verification.

04

Authorization Verification

Verify recipient, amount, network, asset, payer where supported, resource binding, and validity window.

05

Transaction Simulation

Simulate supported Base payment execution using non-state-changing calls before payment.

06

Calldata Verification

Verify supported USDC EIP-3009 authorization calldata matches intended payment semantics.

07

Redirect & Resource Safety

Detect unsafe redirects, credentials or fragments, resource switching, and challenge mismatch.

08

Deterministic Security Decisions

Return machine-readable ALLOW, CAUTION, or BLOCK with canonical reason codes.

API

Use the check you need.

Two paid endpoints for agents deciding whether to make an x402 payment.

POST /before-spend

Flagship simple integration

Security check immediately before an autonomous agent spends money on an x402 seller.

Required: urlOptional: intended_spend_usdc
$0.001
POST /preflight

Detailed payment inspection

Live payment-security inspection for an x402 seller before an agent sends payment.

Required: urlOptional: intended_spend_usdc
$0.001
Machine-readable references

Machine Resources

llms.txt

LLM-readable ARN discovery instructions

VIEW RAW ↗
Capabilities

Machine-readable ARN capability manifest

VIEW RAW ↗
x402 Service Manifest

x402 service discovery metadata

VIEW RAW ↗
For agents

One check before the spend.

  • One before-spend call
  • Deterministic ALLOW / CAUTION / BLOCK
  • No API key
  • No custody or private-key sharing
  • $0.001 per check
For developers

Built for machine integration.

  • OpenAPI and x402/Bazaar discovery
  • JS/TS ARN client helper
  • Canonical reason codes
  • Fail-closed policy helper
  • Machine-readable JSON
Marketplace presence

Discovery status

Verified public discovery surfaces for agents integrating with ARN.

COINBASE / AGENTIC MARKET
DISCOVERABLE
AGENT402.TOOLS
LISTED · ROUTABLE
X402SCAN
LIVE · SEARCHABLE
LAST PAID HIT