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POST
/
v1
/
verify
Verify x402 payment (deprecated)
curl --request POST \
  --url https://api.mrdn.finance/v1/verify \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "paymentPayload": {
    "x402Version": 1,
    "scheme": "exact",
    "network": "base-sepolia",
    "payload": {
      "signature": "<string>",
      "authorization": {
        "from": "<string>",
        "to": "<string>",
        "value": "<string>",
        "validAfter": "<string>",
        "validBefore": "<string>",
        "nonce": "<string>"
      }
    }
  },
  "paymentRequirements": {
    "scheme": "exact",
    "network": "<string>",
    "maxAmountRequired": "<string>",
    "resource": "<string>",
    "description": "<string>",
    "mimeType": "<string>",
    "payTo": "<string>",
    "maxTimeoutSeconds": 123,
    "asset": "<string>",
    "extra": {}
  }
}
'
import requests

url = "https://api.mrdn.finance/v1/verify"

payload = {
    "paymentPayload": {
        "x402Version": 1,
        "scheme": "exact",
        "network": "base-sepolia",
        "payload": {
            "signature": "<string>",
            "authorization": {
                "from": "<string>",
                "to": "<string>",
                "value": "<string>",
                "validAfter": "<string>",
                "validBefore": "<string>",
                "nonce": "<string>"
            }
        }
    },
    "paymentRequirements": {
        "scheme": "exact",
        "network": "<string>",
        "maxAmountRequired": "<string>",
        "resource": "<string>",
        "description": "<string>",
        "mimeType": "<string>",
        "payTo": "<string>",
        "maxTimeoutSeconds": 123,
        "asset": "<string>",
        "extra": {}
    }
}
headers = {
    "Authorization": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)
const options = {
  method: 'POST',
  headers: {Authorization: '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    paymentPayload: {
      x402Version: 1,
      scheme: 'exact',
      network: 'base-sepolia',
      payload: {
        signature: '<string>',
        authorization: {
          from: '<string>',
          to: '<string>',
          value: '<string>',
          validAfter: '<string>',
          validBefore: '<string>',
          nonce: '<string>'
        }
      }
    },
    paymentRequirements: {
      scheme: 'exact',
      network: '<string>',
      maxAmountRequired: '<string>',
      resource: '<string>',
      description: '<string>',
      mimeType: '<string>',
      payTo: '<string>',
      maxTimeoutSeconds: 123,
      asset: '<string>',
      extra: {}
    }
  })
};

fetch('https://api.mrdn.finance/v1/verify', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));
<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.mrdn.finance/v1/verify",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'paymentPayload' => [
        'x402Version' => 1,
        'scheme' => 'exact',
        'network' => 'base-sepolia',
        'payload' => [
                'signature' => '<string>',
                'authorization' => [
                                'from' => '<string>',
                                'to' => '<string>',
                                'value' => '<string>',
                                'validAfter' => '<string>',
                                'validBefore' => '<string>',
                                'nonce' => '<string>'
                ]
        ]
    ],
    'paymentRequirements' => [
        'scheme' => 'exact',
        'network' => '<string>',
        'maxAmountRequired' => '<string>',
        'resource' => '<string>',
        'description' => '<string>',
        'mimeType' => '<string>',
        'payTo' => '<string>',
        'maxTimeoutSeconds' => 123,
        'asset' => '<string>',
        'extra' => [
                
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: <api-key>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.mrdn.finance/v1/verify"

	payload := strings.NewReader("{\n  \"paymentPayload\": {\n    \"x402Version\": 1,\n    \"scheme\": \"exact\",\n    \"network\": \"base-sepolia\",\n    \"payload\": {\n      \"signature\": \"<string>\",\n      \"authorization\": {\n        \"from\": \"<string>\",\n        \"to\": \"<string>\",\n        \"value\": \"<string>\",\n        \"validAfter\": \"<string>\",\n        \"validBefore\": \"<string>\",\n        \"nonce\": \"<string>\"\n      }\n    }\n  },\n  \"paymentRequirements\": {\n    \"scheme\": \"exact\",\n    \"network\": \"<string>\",\n    \"maxAmountRequired\": \"<string>\",\n    \"resource\": \"<string>\",\n    \"description\": \"<string>\",\n    \"mimeType\": \"<string>\",\n    \"payTo\": \"<string>\",\n    \"maxTimeoutSeconds\": 123,\n    \"asset\": \"<string>\",\n    \"extra\": {}\n  }\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}
HttpResponse<String> response = Unirest.post("https://api.mrdn.finance/v1/verify")
  .header("Authorization", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"paymentPayload\": {\n    \"x402Version\": 1,\n    \"scheme\": \"exact\",\n    \"network\": \"base-sepolia\",\n    \"payload\": {\n      \"signature\": \"<string>\",\n      \"authorization\": {\n        \"from\": \"<string>\",\n        \"to\": \"<string>\",\n        \"value\": \"<string>\",\n        \"validAfter\": \"<string>\",\n        \"validBefore\": \"<string>\",\n        \"nonce\": \"<string>\"\n      }\n    }\n  },\n  \"paymentRequirements\": {\n    \"scheme\": \"exact\",\n    \"network\": \"<string>\",\n    \"maxAmountRequired\": \"<string>\",\n    \"resource\": \"<string>\",\n    \"description\": \"<string>\",\n    \"mimeType\": \"<string>\",\n    \"payTo\": \"<string>\",\n    \"maxTimeoutSeconds\": 123,\n    \"asset\": \"<string>\",\n    \"extra\": {}\n  }\n}")
  .asString();
require 'uri'
require 'net/http'

url = URI("https://api.mrdn.finance/v1/verify")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"paymentPayload\": {\n    \"x402Version\": 1,\n    \"scheme\": \"exact\",\n    \"network\": \"base-sepolia\",\n    \"payload\": {\n      \"signature\": \"<string>\",\n      \"authorization\": {\n        \"from\": \"<string>\",\n        \"to\": \"<string>\",\n        \"value\": \"<string>\",\n        \"validAfter\": \"<string>\",\n        \"validBefore\": \"<string>\",\n        \"nonce\": \"<string>\"\n      }\n    }\n  },\n  \"paymentRequirements\": {\n    \"scheme\": \"exact\",\n    \"network\": \"<string>\",\n    \"maxAmountRequired\": \"<string>\",\n    \"resource\": \"<string>\",\n    \"description\": \"<string>\",\n    \"mimeType\": \"<string>\",\n    \"payTo\": \"<string>\",\n    \"maxTimeoutSeconds\": 123,\n    \"asset\": \"<string>\",\n    \"extra\": {}\n  }\n}"

response = http.request(request)
puts response.read_body
{
  "isValid": true,
  "invalidReason": "<string>",
  "payer": "<string>",
  "authContext": {
    "organizationId": "<string>",
    "authMethod": "<string>",
    "timestamp": "<string>"
  }
}
POST /v1/verify is deprecated and retained for legacy integrations only.
Verify an x402 payment with organization-specific authentication. This legacy endpoint validates payment signatures and authorization data according to the x402 protocol specification.
When paymentRequirements.extra.name === "GatewayWalletBatched", verification is forwarded to Circle’s Gateway API. See Circle Gateway (Batched) for that flow and Payment Types for an overview.

​
Features

  • Organization-specific x402 authentication
  • Automatic fallback to default authentication
  • Authentication context in responses
  • Comprehensive error handling

​
Request Example

{
  "paymentPayload": {
    "x402Version": 1,
    "scheme": "exact",
    "network": "base-sepolia",
    "payload": {
      "signature": "0x...",
      "authorization": {
        "from": "0x742d35Cc6634C0532925a3b8D0c4E5e6C2aE7A3e",
        "to": "0x8e633dBf31adCc7D41BE3e95B7c8DD3526B5235A",
        "value": "1000000",
        "validAfter": "1234567890",
        "validBefore": "1234567899",
        "nonce": "0x..."
      }
    }
  },
  "paymentRequirements": {
    "scheme": "exact",
    "network": "base-sepolia",
    "maxAmountRequired": "1000000",
    "resource": "https://example.com/resource",
    "description": "Payment for resource access",
    "mimeType": "application/json",
    "payTo": "0x8e633dBf31adCc7D41BE3e95B7c8DD3526B5235A",
    "maxTimeoutSeconds": 3600,
    "asset": "0x036CbD53842c5426634e7929541eC2318f3dCF7e"
  }
}
For EIP-3009 payloads, both authorization.to and payTo must be set to the facilitator contract address for the network.
POST /v1/verify does not validate the Permit2 payload shape in the current facilitator. Permit2 payments are settled directly through POST /v1/settle.
NetworkFacilitator Contract
arc-testnet0x8e633dBf31adCc7D41BE3e95B7c8DD3526B5235A
bot-chain-testnet0x8e633dBf31adCc7D41BE3e95B7c8DD3526B5235A
bot-chain0x8E7769D440b3460b92159Dd9C6D17302b036e2d6
base0x8E7769D440b3460b92159Dd9C6D17302b036e2d6
bsc0x8E7769D440b3460b92159Dd9C6D17302b036e2d6
base-sepolia0x8e633dBf31adCc7D41BE3e95B7c8DD3526B5235A
avalanche0x8E7769D440b3460b92159Dd9C6D17302b036e2d6
optimism0x8E7769D440b3460b92159Dd9C6D17302b036e2d6
arbitrum0x8E7769D440b3460b92159Dd9C6D17302b036e2d6
optimism-sepolia0x8e633dBf31adCc7D41BE3e95B7c8DD3526B5235A
polygon0x8E7769D440b3460b92159Dd9C6D17302b036e2d6
unichain0x8E7769D440b3460b92159Dd9C6D17302b036e2d6
ink0x8E7769D440b3460b92159Dd9C6D17302b036e2d6
worldchain0x8E7769D440b3460b92159Dd9C6D17302b036e2d6
sei0x8E7769D440b3460b92159Dd9C6D17302b036e2d6
hyperevm0x8E7769D440b3460b92159Dd9C6D17302b036e2d6
megaeth0x8E7769D440b3460b92159Dd9C6D17302b036e2d6
tempo0x8E7769D440b3460b92159Dd9C6D17302b036e2d6
monad0x8E7769D440b3460b92159Dd9C6D17302b036e2d6
robinhood0x8E7769D440b3460b92159Dd9C6D17302b036e2d6

​
Response Example

{
  "isValid": true,
  "payer": "0x742d35Cc6634C0532925a3b8D0c4E5e6C2aE7A3e",
  "authContext": {
    "organizationId": "org_123",
    "authMethod": "organization_specific",
    "timestamp": "2024-01-01T00:00:00.000Z"
  }
}

Authorizations

​
Authorization
string
header
required

Body

application/json
​
paymentPayload
object
required

Legacy x402 payment payload used by POST /v1/verify and by standard EIP-3009 EVM settlement.

​
paymentRequirements
object
required

Response

Legacy payment verification result

​
isValid
boolean

Whether payment is valid

​
invalidReason
string

Reason if payment is invalid

​
payer
string

Payment sender address

​
authContext
object