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Agent Guard – Crypto Address Format Check
x402
Agent Guard – Crypto Address Format Check is a paid API for AI agents from agent-guard.annushka1190.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).
Validates whether a given EVM or Solana address is correctly formatted and returns the detected chain type
Price / call$0.001
Success—
StatusUnknown
How this service works
Safety and trust layer for AI agents: PII redaction, scam/phishing text scan, EVM/Solana address validation, IBAN checks, JSON repair, deep on-chain wallet risk scoring, x402 counterparty endpoint reputation checks. Free discovery: /openapi.json, /.well-known/x402, /v1/capabilities, /mcp (tools/list). REST + MCP. Pay with USDC via x402 — no API keys.
Output
Returns a JSON object with two fields: 'chain' (either 'evm' or 'solana') indicating the detected blockchain, and 'formatValid' (boolean) indicating whether the address is correctly formatted and passes checksum rules.
Example use cases
Pre-transaction wallet address sanity check
“I'm about to send 500 USDC to 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 — can you verify that this is a properly formatted EVM address before I confirm the transaction?”
Detect chain type from user-pasted address
“A user just pasted this address into our app: 'So11111111111111111111111111111111111111112' — can you tell me whether it's an EVM or Solana address and whether the format is valid?”
Agent input validation before on-chain action
“My workflow just received a wallet address from an untrusted source: '5aVBxRGe3eKpgNMn5aVBx...' — validate its format and tell me which chain it belongs to so I know how to route the transaction.”
Technical details
Endpoint
GEThttps://agent-guard.annushka1190.workers.dev/v1/address/format-checkWhen to prefer
Use this endpoint when you need a lightweight, fast check specifically for EVM or Solana address format validity before executing an on-chain transaction or storing a wallet address. Prefer this over general-purpose regex checks because it also detects the chain type and validates EVM checksums (EIP-55). Choose this over full on-chain lookup endpoints when you only need format validation without querying blockchain state.
Side effects
- Missing 'input' query parameter returns a validation error
- Malformed or empty address string may return formatValid:false with no chain detected
- Non-address strings (random text, IBAN, email) may be rejected or return invalid format
- Network timeout on the Cloudflare Workers edge in rare cases
- x402 payment failure if USDC balance or payment header is malformed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true
}
}Tags
x402
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