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DevX Agent Tools – On-Chain Payment Verification
x402
DevX Agent Tools – On-Chain Payment Verification is a paid API for AI agents from devx-x402-tools.nextill-pos.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-29).
Verifies that a specific blockchain transaction hash represents a valid USDC payment, returning confirmation count, transfer amounts, recipient, and whether a minimum threshold was met.
Price / call$0.01
Success—
StatusUnknown
How this service works
Pay-per-call utilities for AI agents, no API key or signup: read any web page as clean Markdown ($0.002), link/SEO metadata ($0.001), domain DNS + SPF/DMARC email-security audit ($0.003), ERC-20 token safety pre-check ($0.005), crypto address validation, on-chain payment verification, EIP-681/BIP21/Solana Pay payment requests with QR, multichain USDC balances ($0.01). x402 v2, USDC on Base. Invalid input / upstream failure is never charged.
Output
Returns a JSON object with: whether the transaction was found, its status (success/pending/failed), number of on-chain confirmations, a list of all USDC transfers (from/to/amount), the total USDC received by the specified recipient, and a boolean indicating whether the minimum USDC threshold was met.
Example use cases
Release digital goods after payment
“Before I give this customer their download link, can you confirm that tx hash 0x7f3a...91bc on Base transferred at least 10 USDC to my wallet 0xMerchant...?”
Validate invoice settlement on-chain
“The client says they paid invoice #1042 — the tx hash is 0xd4e2...88fa on Base. Can you check if it sent at least 50 USDC to 0xMyAddress... and how many confirmations it has?”
Automated agent payment receipt check
“My agent just submitted a payment. Verify that 0x12ab...cd34 on Base is confirmed and sent at least 0.01 USDC to 0xServiceWallet..., so I know it went through before proceeding.”
Technical details
Endpoint
GEThttps://devx-x402-tools.nextill-pos.workers.dev/v1/payment/verify?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to programmatically confirm that a specific on-chain USDC transaction actually occurred and met a payment threshold — especially useful for x402 pay-per-call workflows, digital commerce, or any agentic system that must gate actions on verified payment. Prefer it over manual block explorer checks or heavier indexing solutions when you need a lightweight, pay-per-use verification call with no API key setup.
Side effects
- Transaction hash not yet indexed — returns found: false
- Invalid tx hash format — input rejected, no charge
- Network/chain not supported or unavailable — upstream failure, no charge
- Transaction found but no USDC transfers present — returns empty usdc_transfers array
- Minimum USDC not met — returns meets_min_usdc: false with actual amounts
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"chain": "base",
"found": true,
"status": "success",
"confirmations": 12,
"meets_min_usdc": true,
"usdc_transfers": [
{
"to": "0x...",
"from": "0x...",
"token": "USDC",
"amount": 5
}
],
"usdc_received_by_recipient": 5
}
}Tags
x402
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