# Delx Base USDC Payment Match

> Delx Base USDC Payment Match is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Validates that a Base chain USDC payment's recipient and amount match expected values for pre-flight payment verification.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/base-usdc-payment-match
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-base-usdc-payment-match-26f46fa4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rc55H1CswmKTJ12P9PLxW

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability delx-base-usdc-payment-match-26f46fa4 -d '<json body>'
```

Example prompt: Before processing the next step, can you verify that the USDC payment on Base (chain ID 8453) was actually sent to 0xRecipientAddress with 1000000 raw units, matching the expected recipient 0xExpectedAddress and expected amount 1000000?

## When to prefer this

Use this endpoint when an AI agent or automated workflow needs to pre-flight verify a Base chain USDC payment's recipient and amount before taking a downstream action — especially in x402 payment flows where confirming payment integrity without side effects or data retention is critical. Prefer this over on-chain RPC calls when you need a lightweight, stateless, privacy-preserving match check with an audit hash.

## Known failure modes

- Mismatched recipient address returns recipient_match: false
- Mismatched amount returns amount_match: false
- Invalid or unsupported chain_id may return unexpected base_chain flag
- Malformed address strings may cause validation errors
- Missing required fields returns a schema validation error

## How this service works

Base USDC Payment Match: Base USDC Payment Match checks recipient, raw amount, and chain id for a Base USDC payment intent from bounded caller-supplied values without an external provider. Call Base USDC Payment Match before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for Base USDC Payment Match as versioned deterministic JSO…

## Output

Returns a JSON object with boolean flags for amount_match and recipient_match, a base_chain flag confirming the chain ID maps to Base, the resolved chain_id, overall status ('pass' or similar), and evidence metadata including a SHA-256 hash of the input and a confirmation that no data was retained and no external calls were made.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "chain_id": {
   "type": "integer",
   "description": "Chain Id supplied to Base USDC Payment Match; used only for this bounded calculation and processed in memory without retention."
  },
  "recipient": {
   "type": "string",
   "maxLength": 8192,
   "description": "Recipient supplied to Base USDC Payment Match; used only for this bounded calculation and processed in memory without retention."
  },
  "amount_raw": {
   "type": "string",
   "maxLength": 8192,
   "description": "Amount Raw supplied to Base USDC Payment Match; used only for this bounded calculation and processed in memory without retention."
  },
  "expected_recipient": {
   "type": "string",
   "maxLength": 8192,
   "description": "Expected Recipient supplied to Base USDC Payment Match; used only for this bounded calculation and processed in memory without retention."
  },
  "expected_amount_raw": {
   "type": "string",
   "maxLength": 8192,
   "description": "Expected Amount Raw supplied to Base USDC Payment Match; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "chain_id": 8453,
   "base_chain": true,
   "amount_match": true,
   "recipient_match": true
  },
  "schema": "delx/util-base-usdc-payment-match/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "5bea38f8336c21a3b1abcc4b38ff40491f8b1c58ef31c75c8dbb711392e5bc09",
   "external_calls": 0
  },
  "operation": "evm_preflight:base_usdc_payment_match"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-base-usdc-payment-match-26f46fa4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.delx.ai](https://www.zero.xyz/host/api.delx.ai/llms.txt)