diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 60cc3f7..8a25573 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -11,7 +11,7 @@ jobs:
     runs-on: "ubuntu-22.04"
     strategy:
       matrix:
-        python_version: ["3.8", "3.10"]
+        python_version: ["3.9", "3.10"]
     steps:
       - name: "Checkout"
         uses: "actions/checkout@v3"
diff --git a/Pipfile b/Pipfile
index 7288d4b..67d6340 100644
--- a/Pipfile
+++ b/Pipfile
@@ -4,6 +4,9 @@ verify_ssl = true
 name = "pypi"
 
 [packages]
+# Pin to avoid pyre issues:
+aiohttp = "<3.10"
+async-timeout = "*"
 bech32 = "*"
 coincurve = "*"
 cryptography = "*"
@@ -19,6 +22,7 @@ isort = "==5.11.4"
 pylint = "*"
 pyre-check = "*"
 pytest = "*"
+pytest-asyncio = "*"
 tomli = "*"
 wrapt = "*"
 # Need to lock this version to avoid breaking older python versions:
diff --git a/Pipfile.lock b/Pipfile.lock
index 91d538a..3c74ab8 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "b855927b4cd95080d788d6b029ac0ffd8be5d4dfc4e732283c4d14dbb5700894"
+            "sha256": "8d3e338e2219134d13546e351f20be43b69b982c9643aac429806935f24ca67c"
         },
         "pipfile-spec": 6,
         "requires": {},
@@ -14,6 +14,105 @@
         ]
     },
     "default": {
+        "aiohappyeyeballs": {
+            "hashes": [
+                "sha256:5fdd7d87889c63183afc18ce9271f9b0a7d32c2303e394468dd45d514a757745",
+                "sha256:a980909d50efcd44795c4afeca523296716d50cd756ddca6af8c65b996e27de8"
+            ],
+            "markers": "python_version >= '3.8'",
+            "version": "==2.4.4"
+        },
+        "aiohttp": {
+            "hashes": [
+                "sha256:0605cc2c0088fcaae79f01c913a38611ad09ba68ff482402d3410bf59039bfb8",
+                "sha256:0a158704edf0abcac8ac371fbb54044f3270bdbc93e254a82b6c82be1ef08f3c",
+                "sha256:0cbf56238f4bbf49dab8c2dc2e6b1b68502b1e88d335bea59b3f5b9f4c001475",
+                "sha256:1732102949ff6087589408d76cd6dea656b93c896b011ecafff418c9661dc4ed",
+                "sha256:18f634d540dd099c262e9f887c8bbacc959847cfe5da7a0e2e1cf3f14dbf2daf",
+                "sha256:239f975589a944eeb1bad26b8b140a59a3a320067fb3cd10b75c3092405a1372",
+                "sha256:2faa61a904b83142747fc6a6d7ad8fccff898c849123030f8e75d5d967fd4a81",
+                "sha256:320e8618eda64e19d11bdb3bd04ccc0a816c17eaecb7e4945d01deee2a22f95f",
+                "sha256:38d80498e2e169bc61418ff36170e0aad0cd268da8b38a17c4cf29d254a8b3f1",
+                "sha256:3916c8692dbd9d55c523374a3b8213e628424d19116ac4308e434dbf6d95bbdd",
+                "sha256:393c7aba2b55559ef7ab791c94b44f7482a07bf7640d17b341b79081f5e5cd1a",
+                "sha256:3b7b30258348082826d274504fbc7c849959f1989d86c29bc355107accec6cfb",
+                "sha256:3fcb4046d2904378e3aeea1df51f697b0467f2aac55d232c87ba162709478c46",
+                "sha256:4109adee842b90671f1b689901b948f347325045c15f46b39797ae1bf17019de",
+                "sha256:4558e5012ee03d2638c681e156461d37b7a113fe13970d438d95d10173d25f78",
+                "sha256:45731330e754f5811c314901cebdf19dd776a44b31927fa4b4dbecab9e457b0c",
+                "sha256:4715a9b778f4293b9f8ae7a0a7cef9829f02ff8d6277a39d7f40565c737d3771",
+                "sha256:471f0ef53ccedec9995287f02caf0c068732f026455f07db3f01a46e49d76bbb",
+                "sha256:4d3ebb9e1316ec74277d19c5f482f98cc65a73ccd5430540d6d11682cd857430",
+                "sha256:4ff550491f5492ab5ed3533e76b8567f4b37bd2995e780a1f46bca2024223233",
+                "sha256:52c27110f3862a1afbcb2af4281fc9fdc40327fa286c4625dfee247c3ba90156",
+                "sha256:55b39c8684a46e56ef8c8d24faf02de4a2b2ac60d26cee93bc595651ff545de9",
+                "sha256:5a7ee16aab26e76add4afc45e8f8206c95d1d75540f1039b84a03c3b3800dd59",
+                "sha256:5ca51eadbd67045396bc92a4345d1790b7301c14d1848feaac1d6a6c9289e888",
+                "sha256:5d6b3f1fabe465e819aed2c421a6743d8debbde79b6a8600739300630a01bf2c",
+                "sha256:60cdbd56f4cad9f69c35eaac0fbbdf1f77b0ff9456cebd4902f3dd1cf096464c",
+                "sha256:6380c039ec52866c06d69b5c7aad5478b24ed11696f0e72f6b807cfb261453da",
+                "sha256:639d0042b7670222f33b0028de6b4e2fad6451462ce7df2af8aee37dcac55424",
+                "sha256:66331d00fb28dc90aa606d9a54304af76b335ae204d1836f65797d6fe27f1ca2",
+                "sha256:67c3119f5ddc7261d47163ed86d760ddf0e625cd6246b4ed852e82159617b5fb",
+                "sha256:694d828b5c41255e54bc2dddb51a9f5150b4eefa9886e38b52605a05d96566e8",
+                "sha256:6ae79c1bc12c34082d92bf9422764f799aee4746fd7a392db46b7fd357d4a17a",
+                "sha256:702e2c7c187c1a498a4e2b03155d52658fdd6fda882d3d7fbb891a5cf108bb10",
+                "sha256:714d4e5231fed4ba2762ed489b4aec07b2b9953cf4ee31e9871caac895a839c0",
+                "sha256:7b179eea70833c8dee51ec42f3b4097bd6370892fa93f510f76762105568cf09",
+                "sha256:7f64cbd44443e80094309875d4f9c71d0401e966d191c3d469cde4642bc2e031",
+                "sha256:82a6a97d9771cb48ae16979c3a3a9a18b600a8505b1115cfe354dfb2054468b4",
+                "sha256:84dabd95154f43a2ea80deffec9cb44d2e301e38a0c9d331cc4aa0166fe28ae3",
+                "sha256:8676e8fd73141ded15ea586de0b7cda1542960a7b9ad89b2b06428e97125d4fa",
+                "sha256:88e311d98cc0bf45b62fc46c66753a83445f5ab20038bcc1b8a1cc05666f428a",
+                "sha256:8b4f72fbb66279624bfe83fd5eb6aea0022dad8eec62b71e7bf63ee1caadeafe",
+                "sha256:8c64a6dc3fe5db7b1b4d2b5cb84c4f677768bdc340611eca673afb7cf416ef5a",
+                "sha256:8cf142aa6c1a751fcb364158fd710b8a9be874b81889c2bd13aa8893197455e2",
+                "sha256:8d1964eb7617907c792ca00b341b5ec3e01ae8c280825deadbbd678447b127e1",
+                "sha256:93e22add827447d2e26d67c9ac0161756007f152fdc5210277d00a85f6c92323",
+                "sha256:9c69e77370cce2d6df5d12b4e12bdcca60c47ba13d1cbbc8645dd005a20b738b",
+                "sha256:9dbc053ac75ccc63dc3a3cc547b98c7258ec35a215a92bd9f983e0aac95d3d5b",
+                "sha256:9e3a1ae66e3d0c17cf65c08968a5ee3180c5a95920ec2731f53343fac9bad106",
+                "sha256:a6ea1a5b409a85477fd8e5ee6ad8f0e40bf2844c270955e09360418cfd09abac",
+                "sha256:a81b1143d42b66ffc40a441379387076243ef7b51019204fd3ec36b9f69e77d6",
+                "sha256:ad7f2919d7dac062f24d6f5fe95d401597fbb015a25771f85e692d043c9d7832",
+                "sha256:afc52b8d969eff14e069a710057d15ab9ac17cd4b6753042c407dcea0e40bf75",
+                "sha256:b3df71da99c98534be076196791adca8819761f0bf6e08e07fd7da25127150d6",
+                "sha256:c088c4d70d21f8ca5c0b8b5403fe84a7bc8e024161febdd4ef04575ef35d474d",
+                "sha256:c26959ca7b75ff768e2776d8055bf9582a6267e24556bb7f7bd29e677932be72",
+                "sha256:c413016880e03e69d166efb5a1a95d40f83d5a3a648d16486592c49ffb76d0db",
+                "sha256:c6021d296318cb6f9414b48e6a439a7f5d1f665464da507e8ff640848ee2a58a",
+                "sha256:c671dc117c2c21a1ca10c116cfcd6e3e44da7fcde37bf83b2be485ab377b25da",
+                "sha256:c7a4b7a6cf5b6eb11e109a9755fd4fda7d57395f8c575e166d363b9fc3ec4678",
+                "sha256:c8a02fbeca6f63cb1f0475c799679057fc9268b77075ab7cf3f1c600e81dd46b",
+                "sha256:cd2adf5c87ff6d8b277814a28a535b59e20bfea40a101db6b3bdca7e9926bc24",
+                "sha256:d1469f228cd9ffddd396d9948b8c9cd8022b6d1bf1e40c6f25b0fb90b4f893ed",
+                "sha256:d153f652a687a8e95ad367a86a61e8d53d528b0530ef382ec5aaf533140ed00f",
+                "sha256:d5ab8e1f6bee051a4bf6195e38a5c13e5e161cb7bad83d8854524798bd9fcd6e",
+                "sha256:da00da442a0e31f1c69d26d224e1efd3a1ca5bcbf210978a2ca7426dfcae9f58",
+                "sha256:da22dab31d7180f8c3ac7c7635f3bcd53808f374f6aa333fe0b0b9e14b01f91a",
+                "sha256:e0ae53e33ee7476dd3d1132f932eeb39bf6125083820049d06edcdca4381f342",
+                "sha256:e7a6a8354f1b62e15d48e04350f13e726fa08b62c3d7b8401c0a1314f02e3558",
+                "sha256:e9a3d838441bebcf5cf442700e3963f58b5c33f015341f9ea86dcd7d503c07e2",
+                "sha256:edea7d15772ceeb29db4aff55e482d4bcfb6ae160ce144f2682de02f6d693551",
+                "sha256:f22eb3a6c1080d862befa0a89c380b4dafce29dc6cd56083f630073d102eb595",
+                "sha256:f26383adb94da5e7fb388d441bf09c61e5e35f455a3217bfd790c6b6bc64b2ee",
+                "sha256:f3c2890ca8c59ee683fd09adf32321a40fe1cf164e3387799efb2acebf090c11",
+                "sha256:f64fd07515dad67f24b6ea4a66ae2876c01031de91c93075b8093f07c0a2d93d",
+                "sha256:fcde4c397f673fdec23e6b05ebf8d4751314fa7c24f93334bf1f1364c1c69ac7",
+                "sha256:ff84aeb864e0fac81f676be9f4685f0527b660f1efdc40dcede3c251ef1e867f"
+            ],
+            "index": "pypi",
+            "markers": "python_version >= '3.8'",
+            "version": "==3.9.5"
+        },
+        "aiosignal": {
+            "hashes": [
+                "sha256:45cde58e409a301715980c2b01d0c28bdde3770d8290b5eb2173759d9acb31a5",
+                "sha256:a8c255c66fafb1e499c9351d0bf32ff2d8a0321595ebac3b93713656d2436f54"
+            ],
+            "markers": "python_version >= '3.9'",
+            "version": "==1.3.2"
+        },
         "asn1crypto": {
             "hashes": [
                 "sha256:13ae38502be632115abf8a24cbe5f4da52e3b5231990aff31123c805306ccb9c",
@@ -21,6 +120,23 @@
             ],
             "version": "==1.5.1"
         },
+        "async-timeout": {
+            "hashes": [
+                "sha256:4640d96be84d82d02ed59ea2b7105a0f7b33abe8703703cd0ab0bf87c427522f",
+                "sha256:7405140ff1230c310e51dc27b3145b9092d659ce68ff733fb0cefe3ee42be028"
+            ],
+            "index": "pypi",
+            "markers": "python_version >= '3.7'",
+            "version": "==4.0.3"
+        },
+        "attrs": {
+            "hashes": [
+                "sha256:8f5c07333d543103541ba7be0e2ce16eeee8130cb0b3f9238ab904ce1e85baff",
+                "sha256:ac96cd038792094f438ad1f6ff80837353805ac950cd2aa0e0625ef19850c308"
+            ],
+            "markers": "python_version >= '3.8'",
+            "version": "==24.3.0"
+        },
         "bech32": {
             "hashes": [
                 "sha256:7d6db8214603bd7871fcfa6c0826ef68b85b0abd90fa21c285a9c5e21d2bd899",
@@ -427,13 +543,297 @@
             "markers": "python_version >= '3.7' and python_version < '4'",
             "version": "==2.3.1"
         },
+        "frozenlist": {
+            "hashes": [
+                "sha256:000a77d6034fbad9b6bb880f7ec073027908f1b40254b5d6f26210d2dab1240e",
+                "sha256:03d33c2ddbc1816237a67f66336616416e2bbb6beb306e5f890f2eb22b959cdf",
+                "sha256:04a5c6babd5e8fb7d3c871dc8b321166b80e41b637c31a995ed844a6139942b6",
+                "sha256:0996c66760924da6e88922756d99b47512a71cfd45215f3570bf1e0b694c206a",
+                "sha256:0cc974cc93d32c42e7b0f6cf242a6bd941c57c61b618e78b6c0a96cb72788c1d",
+                "sha256:0f253985bb515ecd89629db13cb58d702035ecd8cfbca7d7a7e29a0e6d39af5f",
+                "sha256:11aabdd62b8b9c4b84081a3c246506d1cddd2dd93ff0ad53ede5defec7886b28",
+                "sha256:12f78f98c2f1c2429d42e6a485f433722b0061d5c0b0139efa64f396efb5886b",
+                "sha256:140228863501b44b809fb39ec56b5d4071f4d0aa6d216c19cbb08b8c5a7eadb9",
+                "sha256:1431d60b36d15cda188ea222033eec8e0eab488f39a272461f2e6d9e1a8e63c2",
+                "sha256:15538c0cbf0e4fa11d1e3a71f823524b0c46299aed6e10ebb4c2089abd8c3bec",
+                "sha256:15b731db116ab3aedec558573c1a5eec78822b32292fe4f2f0345b7f697745c2",
+                "sha256:17dcc32fc7bda7ce5875435003220a457bcfa34ab7924a49a1c19f55b6ee185c",
+                "sha256:1893f948bf6681733aaccf36c5232c231e3b5166d607c5fa77773611df6dc336",
+                "sha256:189f03b53e64144f90990d29a27ec4f7997d91ed3d01b51fa39d2dbe77540fd4",
+                "sha256:1a8ea951bbb6cacd492e3948b8da8c502a3f814f5d20935aae74b5df2b19cf3d",
+                "sha256:1b96af8c582b94d381a1c1f51ffaedeb77c821c690ea5f01da3d70a487dd0a9b",
+                "sha256:1e76bfbc72353269c44e0bc2cfe171900fbf7f722ad74c9a7b638052afe6a00c",
+                "sha256:2150cc6305a2c2ab33299453e2968611dacb970d2283a14955923062c8d00b10",
+                "sha256:226d72559fa19babe2ccd920273e767c96a49b9d3d38badd7c91a0fdeda8ea08",
+                "sha256:237f6b23ee0f44066219dae14c70ae38a63f0440ce6750f868ee08775073f942",
+                "sha256:29d94c256679247b33a3dc96cce0f93cbc69c23bf75ff715919332fdbb6a32b8",
+                "sha256:2b5e23253bb709ef57a8e95e6ae48daa9ac5f265637529e4ce6b003a37b2621f",
+                "sha256:2d0da8bbec082bf6bf18345b180958775363588678f64998c2b7609e34719b10",
+                "sha256:2f3f7a0fbc219fb4455264cae4d9f01ad41ae6ee8524500f381de64ffaa077d5",
+                "sha256:30c72000fbcc35b129cb09956836c7d7abf78ab5416595e4857d1cae8d6251a6",
+                "sha256:31115ba75889723431aa9a4e77d5f398f5cf976eea3bdf61749731f62d4a4a21",
+                "sha256:31a9ac2b38ab9b5a8933b693db4939764ad3f299fcaa931a3e605bc3460e693c",
+                "sha256:366d8f93e3edfe5a918c874702f78faac300209a4d5bf38352b2c1bdc07a766d",
+                "sha256:374ca2dabdccad8e2a76d40b1d037f5bd16824933bf7bcea3e59c891fd4a0923",
+                "sha256:44c49271a937625619e862baacbd037a7ef86dd1ee215afc298a417ff3270608",
+                "sha256:45e0896250900b5aa25180f9aec243e84e92ac84bd4a74d9ad4138ef3f5c97de",
+                "sha256:498524025a5b8ba81695761d78c8dd7382ac0b052f34e66939c42df860b8ff17",
+                "sha256:50cf5e7ee9b98f22bdecbabf3800ae78ddcc26e4a435515fc72d97903e8488e0",
+                "sha256:52ef692a4bc60a6dd57f507429636c2af8b6046db8b31b18dac02cbc8f507f7f",
+                "sha256:561eb1c9579d495fddb6da8959fd2a1fca2c6d060d4113f5844b433fc02f2641",
+                "sha256:5a3ba5f9a0dfed20337d3e966dc359784c9f96503674c2faf015f7fe8e96798c",
+                "sha256:5b6a66c18b5b9dd261ca98dffcb826a525334b2f29e7caa54e182255c5f6a65a",
+                "sha256:5c28f4b5dbef8a0d8aad0d4de24d1e9e981728628afaf4ea0792f5d0939372f0",
+                "sha256:5d7f5a50342475962eb18b740f3beecc685a15b52c91f7d975257e13e029eca9",
+                "sha256:6321899477db90bdeb9299ac3627a6a53c7399c8cd58d25da094007402b039ab",
+                "sha256:6482a5851f5d72767fbd0e507e80737f9c8646ae7fd303def99bfe813f76cf7f",
+                "sha256:666534d15ba8f0fda3f53969117383d5dc021266b3c1a42c9ec4855e4b58b9d3",
+                "sha256:683173d371daad49cffb8309779e886e59c2f369430ad28fe715f66d08d4ab1a",
+                "sha256:6e9080bb2fb195a046e5177f10d9d82b8a204c0736a97a153c2466127de87784",
+                "sha256:73f2e31ea8dd7df61a359b731716018c2be196e5bb3b74ddba107f694fbd7604",
+                "sha256:7437601c4d89d070eac8323f121fcf25f88674627505334654fd027b091db09d",
+                "sha256:76e4753701248476e6286f2ef492af900ea67d9706a0155335a40ea21bf3b2f5",
+                "sha256:7707a25d6a77f5d27ea7dc7d1fc608aa0a478193823f88511ef5e6b8a48f9d03",
+                "sha256:7948140d9f8ece1745be806f2bfdf390127cf1a763b925c4a805c603df5e697e",
+                "sha256:7a1a048f9215c90973402e26c01d1cff8a209e1f1b53f72b95c13db61b00f953",
+                "sha256:7d57d8f702221405a9d9b40f9da8ac2e4a1a8b5285aac6100f3393675f0a85ee",
+                "sha256:7f3c8c1dacd037df16e85227bac13cca58c30da836c6f936ba1df0c05d046d8d",
+                "sha256:81d5af29e61b9c8348e876d442253723928dce6433e0e76cd925cd83f1b4b817",
+                "sha256:828afae9f17e6de596825cf4228ff28fbdf6065974e5ac1410cecc22f699d2b3",
+                "sha256:87f724d055eb4785d9be84e9ebf0f24e392ddfad00b3fe036e43f489fafc9039",
+                "sha256:8969190d709e7c48ea386db202d708eb94bdb29207a1f269bab1196ce0dcca1f",
+                "sha256:90646abbc7a5d5c7c19461d2e3eeb76eb0b204919e6ece342feb6032c9325ae9",
+                "sha256:91d6c171862df0a6c61479d9724f22efb6109111017c87567cfeb7b5d1449fdf",
+                "sha256:9272fa73ca71266702c4c3e2d4a28553ea03418e591e377a03b8e3659d94fa76",
+                "sha256:92b5278ed9d50fe610185ecd23c55d8b307d75ca18e94c0e7de328089ac5dcba",
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+                "sha256:cba4cfa1052819d16699e1d55d18c92b6e094d4517c41dd231a8b9f87b6fa681",
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+                "sha256:d71264a80f3fcf512eb4f18f59423fe82d6e346ee97b90625f283df56aee103f",
+                "sha256:d93f3307ad32a27bda2e88ec81134b823c240aa3abb55821a8da553eed8d9439",
+                "sha256:d9631c5e8b5b3a0fda99cb0d29c18133bca1e18aea9effe55adb3da1adef80d3",
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+                "sha256:e7048abd75fe40712005bcfc06bb44b9dfcd8e101dda2ecf2f5aa46115ad07ca",
+                "sha256:e73091191e4280403bde6c9a52a6999d69cdfde498f1fdf629105247599b57ec",
+                "sha256:e800776a79a5aabdb17dcc2346a7d66d0777e942e4cd251defeb084762ecd17d",
+                "sha256:edc9fc7051e3350643ad929df55c451899bb9ae6d24998a949d2e4c87fb596d3",
+                "sha256:f089118d584e859c62b3da0892b88a83d611c2033ac410e929cb6754eec0ed16",
+                "sha256:f174bbd484294ed9fdf09437f889f95807e5f229d5d93588d34e92106fbf6717",
+                "sha256:f508b0491767bb1f2b87fdfacaba5f7eddc2f867740ec69ece6d1946d29029a6",
+                "sha256:f7a31fc1e1bd362874863fdeed71aed92d348f5336fd84f2197ba40c59f061bd",
+                "sha256:f9479aa06a793c5aeba49ce5c5692ffb51fcd9a7016e017d555d5e2b0045d212"
+            ],
+            "markers": "python_version >= '3.9'",
+            "version": "==0.2.1"
         },
         "pycparser": {
             "hashes": [
@@ -498,11 +898,11 @@
         },
         "typing-extensions": {
             "hashes": [
-                "sha256:69b1a937c3a517342112fb4c6df7e72fc39a38e7891a5730ed4985b5214b5475",
-                "sha256:b0abd7c89e8fb96f98db18d86106ff1d90ab692004eb746cf6eda2682f91b3cb"
+                "sha256:04e5ca0351e0f3f85c6853954072df659d0d13fac324d0072316b67d7794700d",
+                "sha256:1a7ead55c7e559dd4dee8856e3a88b41225abfe1ce8df57b7c13915fe121ffb8"
             ],
             "markers": "python_version >= '3.8'",
-            "version": "==4.10.0"
+            "version": "==4.12.2"
         },
         "urllib3": {
             "hashes": [
@@ -511,6 +911,94 @@
             ],
             "markers": "python_version >= '3.8'",
             "version": "==2.2.1"
+        },
+        "yarl": {
+            "hashes": [
+                "sha256:00e5a1fea0fd4f5bfa7440a47eff01d9822a65b4488f7cff83155a0f31a2ecba",
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+                "sha256:602d98f2c2d929f8e697ed274fbadc09902c4025c5a9963bf4e9edfc3ab6f7ed",
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+                "sha256:6748dbf9bfa5ba1afcc7556b71cda0d7ce5f24768043a02a58846e4a443d808d",
+                "sha256:67a283dd2882ac98cc6318384f565bffc751ab564605959df4752d42483ad889",
+                "sha256:75674776d96d7b851b6498f17824ba17849d790a44d282929c42dbb77d4f17ae",
+                "sha256:757e81cae69244257d125ff31663249b3013b5dc0a8520d73694aed497fb195b",
+                "sha256:77a6e85b90a7641d2e07184df5557132a337f136250caafc9ccaa4a2a998ca2c",
+                "sha256:7c33dd1931a95e5d9a772d0ac5e44cac8957eaf58e3c8da8c1414de7dd27c576",
+                "sha256:7df647e8edd71f000a5208fe6ff8c382a1de8edfbccdbbfe649d263de07d8c34",
+                "sha256:7e2ee16578af3b52ac2f334c3b1f92262f47e02cc6193c598502bd46f5cd1477",
+                "sha256:80316a8bd5109320d38eef8833ccf5f89608c9107d02d2a7f985f98ed6876990",
+                "sha256:82123d0c954dc58db301f5021a01854a85bf1f3bb7d12ae0c01afc414a882ca2",
+                "sha256:84b2deecba4a3f1a398df819151eb72d29bfeb3b69abb145a00ddc8d30094512",
+                "sha256:8503ad47387b8ebd39cbbbdf0bf113e17330ffd339ba1144074da24c545f0069",
+                "sha256:877d209b6aebeb5b16c42cbb377f5f94d9e556626b1bfff66d7b0d115be88d0a",
+                "sha256:8874027a53e3aea659a6d62751800cf6e63314c160fd607489ba5c2edd753cf6",
+                "sha256:88a19f62ff30117e706ebc9090b8ecc79aeb77d0b1f5ec10d2d27a12bc9f66d0",
+                "sha256:8d39d351e7faf01483cc7ff7c0213c412e38e5a340238826be7e0e4da450fdc8",
+                "sha256:90adb47ad432332d4f0bc28f83a5963f426ce9a1a8809f5e584e704b82685dcb",
+                "sha256:913829534200eb0f789d45349e55203a091f45c37a2674678744ae52fae23efa",
+                "sha256:93b2e109287f93db79210f86deb6b9bbb81ac32fc97236b16f7433db7fc437d8",
+                "sha256:9d41beda9dc97ca9ab0b9888cb71f7539124bc05df02c0cff6e5acc5a19dcc6e",
+                "sha256:a440a2a624683108a1b454705ecd7afc1c3438a08e890a1513d468671d90a04e",
+                "sha256:a4bb030cf46a434ec0225bddbebd4b89e6471814ca851abb8696170adb163985",
+                "sha256:a9ca04806f3be0ac6d558fffc2fdf8fcef767e0489d2684a21912cc4ed0cd1b8",
+                "sha256:ac1801c45cbf77b6c99242eeff4fffb5e4e73a800b5c4ad4fc0be5def634d2e1",
+                "sha256:ac36703a585e0929b032fbaab0707b75dc12703766d0b53486eabd5139ebadd5",
+                "sha256:b1771de9944d875f1b98a745bc547e684b863abf8f8287da8466cf470ef52690",
+                "sha256:b464c4ab4bfcb41e3bfd3f1c26600d038376c2de3297760dfe064d2cb7ea8e10",
+                "sha256:b4f6450109834af88cb4cc5ecddfc5380ebb9c228695afc11915a0bf82116789",
+                "sha256:b57f4f58099328dfb26c6a771d09fb20dbbae81d20cfb66141251ea063bd101b",
+                "sha256:b643562c12680b01e17239be267bc306bbc6aac1f34f6444d1bded0c5ce438ca",
+                "sha256:b958ddd075ddba5b09bb0be8a6d9906d2ce933aee81100db289badbeb966f54e",
+                "sha256:b9d60031cf568c627d028239693fd718025719c02c9f55df0a53e587aab951b5",
+                "sha256:ba23302c0c61a9999784e73809427c9dbedd79f66a13d84ad1b1943802eaaf59",
+                "sha256:ba87babd629f8af77f557b61e49e7c7cac36f22f871156b91e10a6e9d4f829e9",
+                "sha256:c017a3b6df3a1bd45b9fa49a0f54005e53fbcad16633870104b66fa1a30a29d8",
+                "sha256:c1e1cc06da1491e6734f0ea1e6294ce00792193c463350626571c287c9a704db",
+                "sha256:c654d5207c78e0bd6d749f6dae1dcbbfde3403ad3a4b11f3c5544d9906969dde",
+                "sha256:c69697d3adff5aa4f874b19c0e4ed65180ceed6318ec856ebc423aa5850d84f7",
+                "sha256:c7d79f7d9aabd6011004e33b22bc13056a3e3fb54794d138af57f5ee9d9032cb",
+                "sha256:ccaa3a4b521b780a7e771cc336a2dba389a0861592bbce09a476190bb0c8b4b3",
+                "sha256:ccd17349166b1bee6e529b4add61727d3f55edb7babbe4069b5764c9587a8cc6",
+                "sha256:ce1af883b94304f493698b00d0f006d56aea98aeb49d75ec7d98cd4a777e9285",
+                "sha256:d0e883008013c0e4aef84dcfe2a0b172c4d23c2669412cf5b3371003941f72bb",
+                "sha256:d980e0325b6eddc81331d3f4551e2a333999fb176fd153e075c6d1c2530aa8a8",
+                "sha256:e17c9361d46a4d5addf777c6dd5eab0715a7684c2f11b88c67ac37edfba6c482",
+                "sha256:e2c08cc9b16f4f4bc522771d96734c7901e7ebef70c6c5c35dd0f10845270bcd",
+                "sha256:e35ef8683211db69ffe129a25d5634319a677570ab6b2eba4afa860f54eeaf75",
+                "sha256:e3b9fd71836999aad54084906f8663dffcd2a7fb5cdafd6c37713b2e72be1760",
+                "sha256:ef9f7768395923c3039055c14334ba4d926f3baf7b776c923c93d80195624782",
+                "sha256:f52a265001d830bc425f82ca9eabda94a64a4d753b07d623a9f2863fde532b53",
+                "sha256:f91c4803173928a25e1a55b943c81f55b8872f0018be83e3ad4938adffb77dd2",
+                "sha256:fbd6748e8ab9b41171bb95c6142faf068f5ef1511935a0aa07025438dd9a9bc1",
+                "sha256:fe57328fbc1bfd0bd0514470ac692630f3901c0ee39052ae47acd1d90a436719",
+                "sha256:fea09ca13323376a2fdfb353a5fa2e59f90cd18d7ca4eaa1fd31f0a8b4f91e62"
+            ],
+            "markers": "python_version >= '3.9'",
+            "version": "==1.18.3"
         }
     },
     "develop": {
@@ -675,11 +1163,11 @@
         },
         "packaging": {
             "hashes": [
-                "sha256:048fb0e9405036518eaaf48a55953c750c11e1a1b68e0dd1a9d62ed0c092cfc5",
-                "sha256:8c491190033a9af7e1d931d0b5dacc2ef47509b34dd0de67ed209b5203fc88c7"
+                "sha256:09abb1bccd265c01f4a3aa3f7a7db064b36514d2cba19a2f694fe6150451a759",
+                "sha256:c228a6dc5e932d346bc5739379109d49e8853dd8223571c7c5b55260edc0b97f"
             ],
-            "markers": "python_version >= '3.7'",
-            "version": "==23.2"
+            "markers": "python_version >= '3.8'",
+            "version": "==24.2"
         },
         "pathspec": {
             "hashes": [
@@ -699,11 +1187,11 @@
         },
         "pluggy": {
             "hashes": [
-                "sha256:7db9f7b503d67d1c5b95f59773ebb58a8c1c288129a88665838012cfb07b8981",
-                "sha256:8c85c2876142a764e5b7548e7d9a0e0ddb46f5185161049a79b7e974454223be"
+                "sha256:2cffa88e94fdc978c4c574f15f9e59b7f4201d439195c3715ca9e2486f1d0cf1",
+                "sha256:44e1ad92c8ca002de6377e165f3e0f1be63266ab4d554740532335b9d75ea669"
             ],
             "markers": "python_version >= '3.8'",
-            "version": "==1.4.0"
+            "version": "==1.5.0"
         },
         "psutil": {
             "hashes": [
@@ -761,11 +1249,21 @@
         },
         "pytest": {
             "hashes": [
-                "sha256:d4051d623a2e0b7e51960ba963193b09ce6daeb9759a451844a21e4ddedfc1bd",
-                "sha256:edfaaef32ce5172d5466b5127b42e0d6d35ebbe4453f0e3505d96afd93f6b096"
+                "sha256:50e16d954148559c9a74109af1eaf0c945ba2d8f30f0a3d3335edde19788b6f6",
+                "sha256:965370d062bce11e73868e0335abac31b4d3de0e82f4007408d242b4f8610761"
+            ],
+            "index": "pypi",
+            "markers": "python_version >= '3.8'",
+            "version": "==8.3.4"
+        },
+        "pytest-asyncio": {
+            "hashes": [
+                "sha256:0d0bb693f7b99da304a0634afc0a4b19e49d5e0de2d670f38dc4bfa5727c5075",
+                "sha256:3f8ef9a98f45948ea91a0ed3dc4268b5326c0e7bce73892acc654df4262ad45f"
             ],
             "index": "pypi",
-            "version": "==8.0.2"
+            "markers": "python_version >= '3.9'",
+            "version": "==0.25.2"
         },
         "pyyaml": {
             "hashes": [
diff --git a/setup.py b/setup.py
index 24ee809..a7fe86f 100755
--- a/setup.py
+++ b/setup.py
@@ -2,4 +2,7 @@
 
 import setuptools
 
-setuptools.setup(include_package_data=True)
+setuptools.setup(
+    include_package_data=True,
+    python_requires=">=3.9",
+)
diff --git a/uma/__init__.py b/uma/__init__.py
index 956fe58..cd366f0 100644
--- a/uma/__init__.py
+++ b/uma/__init__.py
@@ -34,7 +34,11 @@
 )
 from uma.protocol.post_tx_callback import PostTransactionCallback, UtxoWithAmount
 from uma.protocol.pubkey_response import PubkeyResponse
-from uma.public_key_cache import InMemoryPublicKeyCache, IPublicKeyCache
+from uma.public_key_cache import (
+    InMemoryPublicKeyCache,
+    IPublicKeyCache,
+    IAsyncPublicKeyCache,
+)
 from uma.signing_utils import sign_payload
 from uma.type_utils import none_throws
 from uma.uma import (
@@ -47,6 +51,7 @@
     create_uma_lnurlp_request_url,
     create_uma_lnurlp_response,
     fetch_public_key_for_vasp,
+    fetch_public_key_for_vasp_async,
     generate_nonce,
     get_vasp_domain_from_uma_address,
     is_uma_lnurlp_query,
diff --git a/uma/__tests__/test_uma.py b/uma/__tests__/test_uma.py
index f2bbb96..9a94063 100644
--- a/uma/__tests__/test_uma.py
+++ b/uma/__tests__/test_uma.py
@@ -18,7 +18,7 @@
 from uma.protocol.payer_data import compliance_from_payer_data
 from uma.nonce_cache import InMemoryNonceCache
 from uma.protocol.pubkey_response import PubkeyResponse
-from uma.public_key_cache import InMemoryPublicKeyCache
+from uma.public_key_cache import InMemoryPublicKeyCache, IAsyncPublicKeyCache
 from uma.type_utils import none_throws
 from uma.protocol.post_tx_callback import UtxoWithAmount
 from uma.protocol.v0.payreq import PayRequest as V0PayRequest
@@ -33,6 +33,7 @@
     create_pay_request,
     create_post_transaction_callback,
     fetch_public_key_for_vasp,
+    fetch_public_key_for_vasp_async,
     is_uma_lnurlp_query,
     parse_lnurlp_request,
     parse_lnurlp_response,
@@ -77,6 +78,30 @@ def test_fetch_public_key() -> None:
         assert cache.fetch_public_key_for_vasp(vasp_domain) == expected_pubkey
 
 
+@pytest.mark.asyncio
+async def test_fetch_public_key_async() -> None:
+    cache = TestAsyncPublicKeyCache()
+    vasp_domain = "vasp2.com"
+    timestamp = int((datetime.now(timezone.utc) + timedelta(hours=1)).timestamp())
+    expected_pubkey = PubkeyResponse(
+        signing_pubkey=secrets.token_bytes(16),
+        encryption_pubkey=secrets.token_bytes(16),
+        expiration_timestamp=datetime.fromtimestamp(timestamp, timezone.utc),
+        encryption_cert_chain=None,
+        signing_cert_chain=None,
+    )
+    url = "https://vasp2.com/.well-known/lnurlpubkey"
+
+    with patch(
+        "uma.uma._run_http_get_async",
+        return_value=json.dumps(expected_pubkey.to_dict()),
+    ) as mock:
+        pubkey_response = await fetch_public_key_for_vasp_async(vasp_domain, cache)
+        mock.assert_called_once_with(url)
+        assert pubkey_response == expected_pubkey
+        assert await cache.fetch_public_key_for_vasp(vasp_domain) == expected_pubkey
+
+
 def _create_pubkey_response(
     signing_private_key: PrivateKey, encryption_private_key: PrivateKey
 ) -> PubkeyResponse:
@@ -1218,3 +1243,24 @@ def test_uma_invoice_signature() -> None:
 
     assert verify_uma_invoice_signature(invoice, pubkey_response) is None
     assert invoice.signature is not None
+
+
+class TestAsyncPublicKeyCache(IAsyncPublicKeyCache):
+    def __init__(self) -> None:
+        self._cache = InMemoryPublicKeyCache()
+
+    async def fetch_public_key_for_vasp(
+        self, vasp_domain: str
+    ) -> Optional[PubkeyResponse]:
+        return self._cache.fetch_public_key_for_vasp(vasp_domain)
+
+    async def add_public_key_for_vasp(
+        self, vasp_domain: str, public_key: PubkeyResponse
+    ) -> None:
+        self._cache.add_public_key_for_vasp(vasp_domain, public_key)
+
+    async def remove_public_key_for_vasp(self, vasp_domain: str) -> None:
+        self._cache.remove_public_key_for_vasp(vasp_domain)
+
+    async def clear(self) -> None:
+        self._cache.clear()
diff --git a/uma/protocol/payreq_response.py b/uma/protocol/payreq_response.py
index 1d782f0..a91ba68 100644
--- a/uma/protocol/payreq_response.py
+++ b/uma/protocol/payreq_response.py
@@ -226,9 +226,9 @@ def append_backing_signature(
             BackingSignature(domain=domain, signature=backing_signature)
         )
         compliance.backing_signatures = backing_signatures
-        if self.payee_data is None:
-            self.payee_data = {}
-        self.payee_data["compliance"] = compliance.to_dict()
+        payee_data = self.payee_data or {}
+        payee_data["compliance"] = compliance.to_dict()
+        self.payee_data = payee_data
 
     def to_dict(self) -> Dict[str, Any]:
         resp = super().to_dict()
diff --git a/uma/public_key_cache.py b/uma/public_key_cache.py
index f7a3c6f..8391fd1 100644
--- a/uma/public_key_cache.py
+++ b/uma/public_key_cache.py
@@ -56,3 +56,25 @@ def remove_public_key_for_vasp(self, vasp_domain: str) -> None:
 
     def clear(self) -> None:
         self._cache.clear()
+
+
+class IAsyncPublicKeyCache(ABC):
+    @abstractmethod
+    async def fetch_public_key_for_vasp(
+        self, vasp_domain: str
+    ) -> Optional[PubkeyResponse]:
+        pass
+
+    @abstractmethod
+    async def add_public_key_for_vasp(
+        self, vasp_domain: str, public_key: PubkeyResponse
+    ) -> None:
+        pass
+
+    @abstractmethod
+    async def remove_public_key_for_vasp(self, vasp_domain: str) -> None:
+        pass
+
+    @abstractmethod
+    async def clear(self) -> None:
+        pass
diff --git a/uma/uma.py b/uma/uma.py
index c819e5c..fbae2ef 100644
--- a/uma/uma.py
+++ b/uma/uma.py
@@ -10,6 +10,7 @@
 from uuid import uuid4
 
 import requests
+from aiohttp import ClientSession
 from coincurve.ecdsa import cdata_to_der, der_to_cdata, signature_normalize
 from coincurve.keys import PublicKey
 from cryptography.exceptions import InvalidSignature
@@ -52,7 +53,7 @@
 )
 from uma.protocol.post_tx_callback import PostTransactionCallback, UtxoWithAmount
 from uma.protocol.pubkey_response import PubkeyResponse
-from uma.public_key_cache import IPublicKeyCache
+from uma.public_key_cache import IPublicKeyCache, IAsyncPublicKeyCache
 from uma.signing_utils import sign_payload
 from uma.type_utils import none_throws
 from uma.uma_invoice_creator import IUmaInvoiceCreator
@@ -86,6 +87,27 @@ def fetch_public_key_for_vasp(
     return public_key
 
 
+async def fetch_public_key_for_vasp_async(
+    vasp_domain: str, cache: IAsyncPublicKeyCache
+) -> PubkeyResponse:
+    public_key = await cache.fetch_public_key_for_vasp(vasp_domain)
+    if public_key:
+        return public_key
+
+    scheme = "http://" if is_domain_local(vasp_domain) else "https://"
+    url = scheme + vasp_domain + "/.well-known/lnurlpubkey"
+    try:
+        response_text = await _run_http_get_async(url)
+    except Exception as ex:
+        raise InvalidRequestException(
+            f"Unable to fetch pubkey from {vasp_domain}. Make sure the vasp domain is correct."
+        ) from ex
+
+    public_key = PubkeyResponse.from_json(response_text)
+    await cache.add_public_key_for_vasp(vasp_domain, public_key)
+    return public_key
+
+
 def create_pubkey_response(
     signing_cert_chain: str,
     encryption_cert_chain: str,
@@ -124,6 +146,13 @@ def _run_http_get(url: str) -> str:
     return response.text
 
 
+async def _run_http_get_async(url: str) -> str:
+    async with ClientSession() as session:
+        async with session.get(url) as response:
+            response.raise_for_status()
+            return await response.text()
+
+
 def generate_nonce() -> str:
     return str(random.randint(0, 0xFFFFFFFF))