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x402 Crypto Chain Check API
x402
x402 Crypto Chain Check API is a paid API for AI agents from x402-crypto.vercel.app, paid per call via x402, $0.144192/call, status unknown (last checked 2026-09-15).
Looks up blockchain chain information (metadata, IDs, status) by chain name or chain ID, accessed via x402 micropayment
Price / call$0.144192
Success—
StatusUnknown
How this service works
Paid cryptocurrency API endpoints via x402 micropayments
Output
Returns a data object containing chain metadata such as chain ID, network name, and related details for the queried blockchain chain name or ID. The exact structure may vary but includes identifying and configuration information about the requested chain.
Example use cases
Resolve chain ID for smart contract deployment
“I need to deploy a contract to Base network — can you look up the chain ID for Base so I can configure my deployment script?”
Validate chain name before bridging funds
“Before I bridge tokens, can you check if 'Arbitrum One' is a recognized chain and get its chain details?”
Enumerate supported networks for dApp
“I'm building a multi-chain dApp — can you fetch the chain metadata for Optimism so I know the correct chain ID and network info to include in my config?”
Technical details
Endpoint
POSThttps://x402-crypto.vercel.app/api/chaincheck/%7Bpath%7DWhen to prefer
Use this endpoint when you need quick, programmatic lookup of blockchain chain identifiers or metadata by name or chain ID, especially in a Web3 agent context where x402 micropayment infrastructure is already in use. Prefer this over free alternatives when you need pay-per-call flexibility without API key management.
Side effects
- Unknown or unsupported chain name/ID returns an error or empty data
- Malformed query input may result in a 400 bad request
- Payment failure via x402 micropayment protocol blocks the call
- Network timeout or upstream API unavailability returns a 5xx error
- Ambiguous chain name (e.g. testnets vs mainnets) may return unexpected results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| queryrequired | string | Chain name or ID to look up |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| data | object | Response payload from the upstream API (structure varies by endpoint) |
Tags
x402
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