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You can also track an up-to-date list of facilitators and their addresses at facilitators.x402.watch.

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Polygon Amoy

The Amoy testnet facilitator (x402-amoy.polygon.technology) runs x402 v2. Signer addresses: 
Address: 0x5a30808427e4C50Abe7430EEA7722CA88379A6a1
Address: 0x7155A302A792C2aD555F2B66E5bC2709044D12dF
Address: 0x17070da58e348b27098e1a04e848AC8faA66DA62
Address: 0x812ab2C611D5103a0907028226B756466017FcF8
Address: 0x863f5153F416f0186C762Eeb5Ce7721c694f344e
Address: 0x680B2227bde0858A269B4a3FE24eaaFC3C3E1e96
Address: 0x8D7e970Cb3c0865d46C0C5bd3a1c1203a9d12aBc
Address: 0x06853A2390c500D351d470d5c191794404AC6FA4

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Polygon (mainnet)

The mainnet facilitator (x402.polygon.technology) runs x402 v2. Signer addresses: Polygon maintains a rotation of three sets of eight addresses: 
x402_1.keys:Address: 0x29df60c005506AA325d7179F6e09eB4b4875dAde
x402_1.keys:Address: 0xF09A94831C18566781f70937f0996B96EfE691C8
x402_1.keys:Address: 0x42618f623Ec19beFf78dE9DbBFB653BfEaC05D09
x402_1.keys:Address: 0x3202643514D128FF0B4625D2682c0244CF58131c
x402_1.keys:Address: 0x11DA3fe5ADA6f5382Ebe972f14C3585DA4E65AeA
x402_1.keys:Address: 0x135DfE729F9bbd7F88181E1B708d7506fd499140
x402_1.keys:Address: 0xDcb0Ac359025dC0DB1e22e6d33F404e5c92A1564
x402_1.keys:Address: 0x99EFc08BB42282716fB59D221792f5207f714C9d

x402_2.keys:Address: 0xbE5115800247405f020197BF473eBFd085a2C635
x402_2.keys:Address: 0x5eAb3D78264Dab340340d6a37Ff0836464Ae5773
x402_2.keys:Address: 0xE5D4197eFd5D03E3f30cBf11C0fF63Eb95a0A656
x402_2.keys:Address: 0xfac8Edb989f1ba7F9dBb7A1233542D4e1fD6144F
x402_2.keys:Address: 0xaFdbfaCb5ed691bf0bCFA660901f299ce9775489
x402_2.keys:Address: 0x1e48Ed59a502D0B324CdAf83362865b3ff49ABa2
x402_2.keys:Address: 0xA1dcBDC2C34577ACD4A1152A98807B2f281A112e
x402_2.keys:Address: 0x9e281D4e26E1a4e7C27014E2ca8Cee7F2D44fa52

x402_3.keys:Address: 0x76FCb8ae3365A487E6EA235386C1cf3AbADeDA60
x402_3.keys:Address: 0x9523B120C75640469f1D16490Da0388928229452
x402_3.keys:Address: 0x153F3A70e4400c211d9B482b62aD721Bb02F96F6
x402_3.keys:Address: 0xd5dD012019C58882Dd507A8b3fCBB7b62e9a24c3
x402_3.keys:Address: 0xfff23108338C218F895d75980E14688218D4E92a
x402_3.keys:Address: 0xF744e153Ef63f7EEe4a58e0F13761D16C2125EE3
x402_3.keys:Address: 0x0a8B10FE8Bd3072351600Adef4796F3F7aF72Ab0
x402_3.keys:Address: 0x971b4079A618F72Fa0F1792b07ed5923dfBF3500

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ThirdWeb

0x80c08de1a05Df2bD633CF520754e40fdE3C794d3

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Questflow

0x4a288FA07fC40F701e4fd2620F0a14338e12a4D7

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PayAI

0xc6699d2aadA6c36Dfea5C248DD70f9CB0235cB63

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x402.rs

0xD8Dfc729cBd05381647EB5540D756f4f8Ad63eec

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Corbits

0x06F0BfD2C8f36674DF5cdE852c1eeD8025C268C9