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Delx Commerce X402 Scheme Select
x402
Delx Commerce X402 Scheme Select is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).
Selects the best matching X402 payment scheme from a list of schemes against a set of supported schemes, returning the chosen scheme with verifiable evidence.
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.
Output
Returns a JSON object with the selected scheme name, a list of supported schemes, a status ('pass'), and a verifiable evidence block containing a SHA-256 hash of the input, a flag confirming no data retention, and a count of zero external calls made during processing.
Example use cases
Agent payment scheme negotiation
“My agent is about to pay for an API using x402. My schemes are ['exact','streaming'] and the server says it supports ['exact']. Which scheme should we use?”
Validate scheme compatibility before transaction
“Before I send a payment, check if any of my schemes ['flexible','exact'] are compatible with the server's supported schemes ['exact','batch'] and tell me which one to pick.”
Automated scheme selection in payment pipeline
“I'm building an agent payment pipeline — given the offered schemes ['exact'] and the server's supported list ['exact','streaming'], automatically select the right scheme so I can proceed without manual intervention.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/x402-scheme-select?utm_source=zero.xyzWhen to prefer
Use this endpoint when your agent needs to programmatically negotiate the correct X402 payment scheme before initiating a micropayment, particularly when interacting with servers that advertise multiple scheme options and you need a deterministic, verifiable selection with cryptographic evidence of the input — without retaining sensitive data server-side.
Side effects
- No matching scheme found between offered and supported lists — returns error or empty selection
- Malformed or empty schemes arrays — may return validation error
- Exceeding maxItems (256) per array — request rejected
- Non-string scheme values — schema validation failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| schemes | array | Schemes supplied to X402 Scheme Select; used only for this bounded calculation and processed in memory without retention. |
| supported_schemes | array | Supported Schemes supplied to X402 Scheme Select; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"selected": "exact",
"supported": [
"exact"
]
},
"schema": "delx/util-x402-scheme-select/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "a045739927a7259d237f0c405b73130cd2fb17caabdca6ce41cffff6ac4ff2ed",
"external_calls": 0
},
"operation": "delivery_contract:x402_scheme_select"
}
}Tags
x402
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