largest operators of open-loop and closed-loop retail electronic payments networks the largest operators of open-loop and closed-loop retail electronic payments networks are visa , mastercard , american express , discover , jcb and diners club .
with the exception of discover , which primarily operates in the united states , all of the other network operators can be considered multi- national or global providers of payments network services .
based on payments volume , total volume , number of transactions and number of cards in circulation , visa is the largest retail electronic payments network in the world .
the following chart compares our network with those of our major competitors for calendar year 2007 : company payments volume volume transactions cards ( billions ) ( billions ) ( billions ) ( millions ) visa inc. ( 1 ) .
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$ 2457 $ 3822 50.3 1592 .

Company
Payments Volume  (billions)
Total Volume  (billions)<i></i>
Total Transactions  (billions)
<i></i> Cards  (millions)
Visa Inc.<sup>(1)</sup>
$2,457
$3,822
50.3<i></i>
1,592
MasterCard
1,697
2,276
27.0
916
American Express
637
647
5.0
86
Discover
102
119
1.6
57
JCB
55
61
0.6
58
Diners Club
29
30
0.2
7

( 1 ) visa inc .
figures as reported previously in our filings .
source : the nilson report , issue 902 ( may 2008 ) and issue 903 ( may 2008 ) .
note : visa inc .
figures exclude visa europe .
figures for competitors include their respective european operations .
visa figures include visa , visa electron , and interlink brands .
visa cards include plus proprietary cards , but proprietary plus cash volume is not included .
domestic china figures are excluded .
mastercard figures include pin-based debit card figures on mastercard cards , but not maestro or cirrus figures .
china commercial funds transfers are excluded .
american express and discover include business from third-party issuers .
jcb figures are for april 2006 through march 2007 , but cards and outlets are as of september 2007 .
jcb total transaction figures are estimates .
our primary operations we generate revenue from the transaction processing services we offer to our customers .
our customers deliver visa products and payment services to consumers and merchants based on the product platforms we define and manage .
payments network management is a core part of our operations , as it ensures that our payments system provides a safe , efficient , consistent , and interoperable service to cardholders , merchants , and financial institutions worldwide .
transaction processing services core processing services our core processing services involve the routing of payment information and related data to facilitate the authorization , clearing and settlement of transactions between visa issuers , which are the financial institutions that issue visa cards to cardholders , and acquirers , which are the financial institutions that offer visa network connectivity and payments acceptance services to merchants .
in addition , we offer a range of value-added processing services to support our customers 2019 visa programs and to promote the growth and security of the visa payments network .
authorization is the process of approving or declining a transaction before a purchase is finalized or cash is disbursed .
clearing is the process of delivering final transaction data from an acquirer to an issuer for posting to the cardholder 2019s account , the calculation of certain fees and charges that apply to the issuer and acquirer involved in the transaction , and the conversion of transaction amounts to the .

Question: Analyse this data from a financial earnings document. what is the average payment volume per transaction for american express?
Choices:
10.1
0
1
127.4
20.4
Correct choice index: 3