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AgentResolver ABI Encode — x402 Payment Preflight & PayTo Verification
x402
AgentResolver ABI Encode — x402 Payment Preflight & PayTo Verification is a paid API for AI agents from agentresolver.vercel.app, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-19).
ABI-encodes typed Solidity/EVM values for use in x402 payment preflight and payTo verification flows
Price / call$0.005
Success—
StatusUnknown
How this service works
Verify an x402 endpoint before paying: live payTo, USDC quote, network, asset, resource binding, TLS and endpoint safety for $0.001 on Base or Solana.
Output
Returns ABI-encoded hex data corresponding to the provided Solidity types and values array, suitable for use in EVM smart contract calls, x402 payment headers, or payTo verification payloads.
Example use cases
Encode USDC payment parameters for x402
“I need to ABI-encode the types ['address','uint256'] with values ['0x4F96Fe3b7A6Cf9725f59d353F723c1bDb64CA6Aa','5000000'] to prepare a USDC payment payload for an x402 endpoint on Base.”
Prepare calldata for smart contract resource binding
“Can you ABI-encode ['bytes32','address','uint256'] with values ['0xdeadbeef...','0x1234abcd...','1'] so I can verify resource binding before paying for a gated API?”
Validate encoded payload before x402 preflight
“Encode these Solidity types ['string','address'] with values ['hello','0xABCDEF1234567890abcdef1234567890ABCDEF12'] and give me the hex output so I can run a preflight safety check on the x402 endpoint.”
Technical details
Endpoint
POSThttps://agentresolver.vercel.app/api/abi-encodeWhen to prefer
Choose this endpoint when you need to ABI-encode EVM/Solidity typed values as part of an x402 payment preflight, payTo address verification, or on-chain resource binding check — especially when working on Base or Solana networks with USDC. It is purpose-built for the x402 payment protocol context rather than being a general-purpose ABI encoder.
Side effects
- Type/value array length mismatch returns a validation error
- Unsupported or malformed Solidity type strings cause encoding failure
- Values incompatible with their declared types (e.g. non-hex for address) return a 400 error
- Empty types or values arrays rejected (minItems: 1 enforced)
- Arrays exceeding 32 items return a limit error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| types | array | |
| values | array |
Output
Schema · Response
{
"type": "json",
"example": {}
}Tags
x402
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