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X402 Asset Match
x402
X402 Asset Match is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Compares a challenge asset identifier against a list of buyer-supported assets and returns an explicit accept/reject verdict with mismatch reasons and normalized evidence.
Price / call$0.001
Success—
StatusUnknown
How this service works
X402 Asset Match: X402 Asset Match compares a challenge asset identifier with buyer-supported assets from bounded caller-supplied values without an external provider. Call X402 Asset Match before paying for or accepting an x402 or agent delivery assembled from caller-supplied challenge and result metadata. Returns contract-specific checks, normalized evidence, mismatch reasons, and an explicit acceptance or rejection status for X402 Asset Match as versioned deterministic JSON. Price: $0.001 USD…
Output
Returns versioned deterministic JSON containing an explicit accept or reject status, contract-specific checks, normalized evidence of the comparison, and detailed mismatch reasons explaining why the asset was or was not accepted.
Example use cases
Pre-payment x402 asset gating
“Before we proceed with this x402 payment, check if the challenge asset '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48' is in our supported assets ['0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48', '0xdAC17F958D2ee523a2206206994597C13D831ec7'] and return the match verdict.”
Agent delivery asset verification
“We just received an agent delivery with asset '0xB8c77482e45F1F44dE1745F52C74426C631bDD52' — check if that matches any of our supported assets ['0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48'] and give me the mismatch reasons if it fails.”
Dynamic x402 asset policy enforcement
“Our payment gateway got a challenge with asset identifier 'eth-mainnet:0xdAC17F958D2ee523a2206206994597C13D831ec7'. Validate it against our supported list ['0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48', '0xdAC17F958D2ee523a2206206994597C13D831ec7', '0x6B175474E89094C44Da98b954EedeAC495271d0F'] and tell me whether to accept or reject.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/x402-asset-matchWhen to prefer
Choose this endpoint when you need a deterministic, stateless, in-memory asset compatibility check within an x402 payment or agent delivery flow — especially when you want an explicit accept/reject verdict with structured mismatch reasoning rather than writing your own comparison logic. Prefer this over ad-hoc string matching when you need versioned, auditable evidence of the comparison decision.
Side effects
- Asset string exceeds 8192 character limit — request rejected
- Supported assets array exceeds 256 items — request rejected
- Malformed or non-string asset identifier — validation error returned
- Empty supported_assets array — likely results in rejection with mismatch reason
- Missing required 'asset' field — schema validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| asset | string | Asset supplied to X402 Asset Match; used only for this bounded calculation and processed in memory without retention. |
| supported_assets | array | Supported Assets supplied to X402 Asset Match; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"actual": "USDC",
"matched": true,
"supported": [
"USDC"
]
},
"schema": "delx/util-x402-asset-match/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "87c9c6183983f222462f4ce259bafbeb4418e6ba18af409b98db69898b5ce097",
"external_calls": 0
},
"operation": "delivery_contract:x402_asset_match"
}
}Tags
x402
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