diff --git a/stellar-payment-platform/package-lock.json b/stellar-payment-platform/package-lock.json
index 86bdd16..d0c0e99 100644
--- a/stellar-payment-platform/package-lock.json
+++ b/stellar-payment-platform/package-lock.json
@@ -9,6 +9,8 @@
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       "hasInstallScript": true,
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         "@prisma/client": "^6.19.3",
         "@sentry/node": "^10.68.0",
@@ -21,6 +23,7 @@
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         "express-rate-limit": "^7.5.0",
         "generic-pool": "^3.9.0",
+        "graphql": "^16.14.2",
         "helmet": "^8.3.0",
         "json2csv": "5.0.7",
         "jsonwebtoken": "9.0.2",
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-    "node_modules/lodash.once": {
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-      "resolved": "https://registry.npmjs.org/lodash.once/-/lodash.once-4.1.1.tgz",
-      "integrity": "sha512-Sb487aTOCr9drQVL8pIxOzVhafOjZN9UU54hiN8PU3uAiSV7lx1yYNpbNmex2PK6dSJoNTSJUUswT651yww3Mg==",
-      "license": "MIT"
+    "node_modules/long": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/long/-/long-4.0.0.tgz",
+      "integrity": "sha512-XsP+KhQif4bjX1kbuSiySJFNAehNxgLb6hPRGJ9QsUr8ajHkuXGdrHmFUTUUXhDwVX2R5bY4JNZEwbUiMhV+MA==",
+      "license": "Apache-2.0"
     },
     "node_modules/lru-cache": {
       "version": "5.1.1",
@@ -7256,6 +7922,26 @@
       "integrity": "sha512-E5LDX7Wrp85Kil5bhZv46j8jOeboKq5JMmYM3gVGdGH8xFpPWXUMsNrlODCrkoxMEeNi/XZIwuRvY4XNwYMJpw==",
       "license": "ISC"
     },
+    "node_modules/sha.js": {
+      "version": "2.4.12",
+      "resolved": "https://registry.npmjs.org/sha.js/-/sha.js-2.4.12.tgz",
+      "integrity": "sha512-8LzC5+bvI45BjpfXU8V5fdU2mfeKiQe1D1gIMn7XUlF3OTUrpdJpPPH4EMAnF0DsHHdSZqCdSss5qCmJKuiO3w==",
+      "license": "(MIT AND BSD-3-Clause)",
+      "dependencies": {
+        "inherits": "^2.0.4",
+        "safe-buffer": "^5.2.1",
+        "to-buffer": "^1.2.0"
+      },
+      "bin": {
+        "sha.js": "bin.js"
+      },
+      "engines": {
+        "node": ">= 0.10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/shebang-command": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
@@ -7714,6 +8400,20 @@
       "dev": true,
       "license": "BSD-3-Clause"
     },
+    "node_modules/to-buffer": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/to-buffer/-/to-buffer-1.2.2.tgz",
+      "integrity": "sha512-db0E3UJjcFhpDhAF4tLo03oli3pwl3dbnzXOUIlRKrp+ldk/VUxzpWYZENsw2SZiuBjHAk7DfB0VU7NKdpb6sw==",
+      "license": "MIT",
+      "dependencies": {
+        "isarray": "^2.0.5",
+        "safe-buffer": "^5.2.1",
+        "typed-array-buffer": "^1.0.3"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
     "node_modules/to-regex-range": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
@@ -7797,6 +8497,20 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/typed-array-buffer": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/typed-array-buffer/-/typed-array-buffer-1.0.3.tgz",
+      "integrity": "sha512-nAYYwfY3qnzX30IkA6AQZjVbtK6duGontcQm1WSG1MD94YLqK0515GNApXkoxKOWMusVssAHWLh9SeaoefYFGw==",
+      "license": "MIT",
+      "dependencies": {
+        "call-bound": "^1.0.3",
+        "es-errors": "^1.3.0",
+        "is-typed-array": "^1.1.14"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
     "node_modules/uint8array-extras": {
       "version": "1.5.0",
       "resolved": "https://registry.npmjs.org/uint8array-extras/-/uint8array-extras-1.5.0.tgz",
@@ -7939,6 +8653,15 @@
         "makeerror": "1.0.12"
       }
     },
+    "node_modules/whatwg-mimetype": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-4.0.0.tgz",
+      "integrity": "sha512-QaKxh0eNIi2mE9p2vEdzfagOKHCcj1pJ56EEHGQOVxp8r9/iszLUUV7v89x9O1p/T+NlTM5W7jW6+cz4Fq1YVg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
diff --git a/stellar-payment-platform/package.json b/stellar-payment-platform/package.json
index af206fe..21ea249 100644
--- a/stellar-payment-platform/package.json
+++ b/stellar-payment-platform/package.json
@@ -25,6 +25,8 @@
     "testEnvironment": "node"
   },
   "dependencies": {
+    "@apollo/server": "^5.5.1",
+    "@as-integrations/express4": "^1.1.2",
     "@faker-js/faker": "^10.5.0",
     "@prisma/client": "^6.19.3",
     "@sentry/node": "^10.68.0",
@@ -37,6 +39,7 @@
     "express": "^4.21.2",
     "express-rate-limit": "^7.5.0",
     "generic-pool": "^3.9.0",
+    "graphql": "^16.14.2",
     "helmet": "^8.3.0",
     "json2csv": "5.0.7",
     "jsonwebtoken": "9.0.2",
diff --git a/stellar-payment-platform/server.js b/stellar-payment-platform/server.js
index 057670a..b2ae1f0 100644
--- a/stellar-payment-platform/server.js
+++ b/stellar-payment-platform/server.js
@@ -32,9 +32,7 @@ const { validateSchema } = require('./src/middleware/validateSchema');
 const { buildErrorHandler, notFoundHandler } = require('./src/middleware/errorHandler');
 const { ApiError, errorBody } = require('./src/errors');
 const { requireJson } = require('./src/middleware/requireJson');
-const { bodySizeLimit } = require('./src/middleware/bodyLimit');
-const { apiVersion } = require('./src/middleware/apiVersion');
-const { deprecationMiddleware } = require('./src/middleware/deprecation');
+const { graphqlMiddleware } = require('./src/graphql');
 const {
   registerBodySchema,
   federationQuerySchema,
@@ -232,6 +230,11 @@ app.use(limiter);
 const isPrimitive = (v) => v === null || v === undefined || typeof v !== 'object';
 
 const rejectNestedObjects = (req, res, next) => {
+  // GraphQL variables are intentionally nested; REST endpoints retain the
+  // existing flat-parameter restriction.
+  if (req.path === '/graphql' || req.originalUrl?.startsWith('/graphql/')) {
+    return next();
+  }
   const sources = [req.query, req.body];
   for (const source of sources) {
     if (source && typeof source === 'object') {
@@ -976,6 +979,7 @@ app.use('/api', v1Router);
 app.use('/', v1Router);
 // Auth endpoints (email OTP verification) - uses Redis when available
 app.use('/auth', require('./src/routes/v1/authRoutes')(redisClient));
+app.use('/graphql', graphqlMiddleware);
 
 // API key management endpoints (rotation, invalidation, listing)
 app.use('/auth/api-keys', require('./src/routes/v1/apiKeyRoutes')(redisClient));
diff --git a/stellar-payment-platform/src/graphql/index.js b/stellar-payment-platform/src/graphql/index.js
new file mode 100644
index 0000000..dd0006f
--- /dev/null
+++ b/stellar-payment-platform/src/graphql/index.js
@@ -0,0 +1,42 @@
+const { ApolloServer } = require('@apollo/server');
+const { expressMiddleware } = require('@as-integrations/express4');
+const { typeDefs } = require('./schema');
+const { resolvers } = require('./resolvers');
+const { prisma } = require('../../prismaClient');
+
+const apolloServer = new ApolloServer({ typeDefs, resolvers });
+const started = apolloServer.start();
+
+const getContext = async ({ req }) => {
+  const address = typeof req.headers['x-user-address'] === 'string'
+    ? req.headers['x-user-address'].trim()
+    : null;
+  const username = typeof req.headers['x-username'] === 'string'
+    ? req.headers['x-username'].trim().toLowerCase()
+    : null;
+  const apiKey = req.headers['x-api-key'];
+  const user = address || username
+    ? await prisma.user.findFirst({
+      where: { ...(address ? { address } : { username }), deletedAt: null },
+    })
+    : null;
+
+  return {
+    req,
+    auth: {
+      address,
+      username,
+      authorization: req.headers.authorization || null,
+      role: apiKey && apiKey === process.env.ADMIN_API_KEY ? 'admin' : 'user',
+    },
+    user,
+  };
+};
+
+const graphqlMiddleware = (req, res, next) => {
+  started
+    .then(() => expressMiddleware(apolloServer, { context: getContext })(req, res, next))
+    .catch(next);
+};
+
+module.exports = { graphqlMiddleware, apolloServer };
diff --git a/stellar-payment-platform/src/graphql/resolvers.js b/stellar-payment-platform/src/graphql/resolvers.js
new file mode 100644
index 0000000..ffbaced
--- /dev/null
+++ b/stellar-payment-platform/src/graphql/resolvers.js
@@ -0,0 +1,118 @@
+const crypto = require('crypto');
+const { StrKey } = require('@stellar/stellar-sdk');
+const { prisma } = require('../../prismaClient');
+const { normalizeNameTag, validateMemo, RESERVED_NAMES } = require('../utils');
+const { dateTime } = require('./schema');
+
+const badInput = (message) => {
+  const error = new Error(message);
+  error.extensions = { code: 'BAD_USER_INPUT' };
+  return error;
+};
+
+const requireUser = (context) => {
+  if (!context.user) {
+    const error = new Error('Authentication required');
+    error.extensions = { code: 'UNAUTHENTICATED' };
+    throw error;
+  }
+  return context.user;
+};
+
+const requireOwner = (context, username) => {
+  const user = requireUser(context);
+  if (context.auth?.role !== 'admin' && user.username !== username) {
+    const error = new Error('You are not authorized to modify this user');
+    error.extensions = { code: 'FORBIDDEN' };
+    throw error;
+  }
+  return user;
+};
+
+const userWhere = ({ username, address } = {}) => {
+  if (!username && !address) throw badInput('Provide a username or address');
+  return { ...(username ? { username: normalizeNameTag(username).toLowerCase() } : {}), ...(address ? { address } : {}), deletedAt: null };
+};
+
+const resolvers = {
+  DateTime: dateTime,
+  User: {
+    webhooks: (user) => prisma.webhook.findMany({ where: { username: user.username }, orderBy: { createdAt: 'desc' } }),
+  },
+  Query: {
+    user: (_root, args) => prisma.user.findFirst({ where: userWhere(args) }),
+    users: async (_root, { search, page = 1, limit = 25 }) => {
+      if (page < 1 || limit < 1 || limit > 100) throw badInput('page must be positive and limit must be between 1 and 100');
+      const where = {
+        deletedAt: null,
+        ...(search ? {
+          OR: [
+            { username: { contains: search, mode: 'insensitive' } },
+            { address: { contains: search, mode: 'insensitive' } },
+          ],
+        } : {}),
+      };
+      const [totalCount, nodes] = await prisma.$transaction([
+        prisma.user.count({ where }),
+        prisma.user.findMany({ where, orderBy: { createdAt: 'desc' }, skip: (page - 1) * limit, take: limit }),
+      ]);
+      return { nodes, totalCount, page, limit, totalPages: Math.ceil(totalCount / limit) };
+    },
+    webhooks: async (_root, { username }, context) => {
+      const user = requireUser(context);
+      const requestedUsername = username ? normalizeNameTag(username).toLowerCase() : user.username;
+      requireOwner(context, requestedUsername);
+      return prisma.webhook.findMany({ where: { username: requestedUsername }, orderBy: { createdAt: 'desc' } });
+    },
+  },
+  Mutation: {
+    registerUser: async (_root, { input }) => {
+      const username = normalizeNameTag(input.username).toLowerCase();
+      if (RESERVED_NAMES.includes(username)) throw badInput('This username is reserved and cannot be registered');
+      if (!StrKey.isValidEd25519PublicKey(input.address)) throw badInput('Invalid Stellar public key');
+      const memoError = validateMemo(input.memoType, input.memo);
+      if (memoError) throw badInput(memoError);
+      try {
+        return await prisma.user.create({
+          data: {
+            username,
+            address: input.address,
+            ...(input.memoType ? { memoType: input.memoType, memo: input.memo } : {}),
+          },
+        });
+      } catch (error) {
+        if (error.code === 'P2002' || /unique/i.test(error.message || '')) throw badInput('Username or address is already registered');
+        throw error;
+      }
+    },
+    deleteUser: async (_root, { username }, context) => {
+      const normalizedUsername = normalizeNameTag(username).toLowerCase();
+      requireOwner(context, normalizedUsername);
+      const existing = await prisma.user.findFirst({ where: { username: normalizedUsername, deletedAt: null } });
+      if (!existing) throw badInput('Username not found or already deleted');
+      await prisma.user.update({ where: { username: normalizedUsername }, data: { deletedAt: new Date() } });
+      return { success: true, username: normalizedUsername };
+    },
+    createWebhook: async (_root, { input }, context) => {
+      const user = requireOwner(context, normalizeNameTag(input.username).toLowerCase());
+      if (!/^https?:\/\/.{1,2040}$/i.test(input.url)) throw badInput('Webhook URL must use http or https');
+      return prisma.webhook.create({
+        data: {
+          username: user.username,
+          url: input.url,
+          secret: crypto.randomBytes(32).toString('hex'),
+        },
+      });
+    },
+    deleteWebhook: async (_root, { id }, context) => {
+      const user = requireUser(context);
+      const result = await prisma.webhook.deleteMany({
+        where: { id, ...(context.auth?.role === 'admin' ? {} : { username: user.username }) },
+      });
+      if (!result.count) throw badInput('Webhook not found');
+      return { success: true };
+    },
+  },
+};
+
+module.exports = { resolvers };
diff --git a/stellar-payment-platform/src/graphql/schema.js b/stellar-payment-platform/src/graphql/schema.js
new file mode 100644
index 0000000..a80ea7c
--- /dev/null
+++ b/stellar-payment-platform/src/graphql/schema.js
@@ -0,0 +1,86 @@
+const { GraphQLScalarType, Kind } = require('graphql');
+
+const typeDefs = `#graphql
+  scalar DateTime
+
+  type User {
+    username: String!
+    address: String!
+    memoType: String
+    memo: String
+    createdAt: DateTime!
+    flaggedAt: DateTime
+    webhooks: [Webhook!]!
+  }
+
+  type Webhook {
+    id: ID!
+    username: String!
+    url: String!
+    createdAt: DateTime!
+    lastSentAt: DateTime
+    failingSince: DateTime
+  }
+
+  type UserConnection {
+    nodes: [User!]!
+    totalCount: Int!
+    page: Int!
+    limit: Int!
+    totalPages: Int!
+  }
+
+  input RegisterUserInput {
+    username: String!
+    address: String!
+    memoType: String
+    memo: String
+    signature: String
+    signerAddress: String
+  }
+
+  input CreateWebhookInput {
+    username: String!
+    url: String!
+  }
+
+  type MutationResult {
+    success: Boolean!
+    username: String
+  }
+
+  type Query {
+    user(username: String, address: String): User
+    users(search: String, page: Int = 1, limit: Int = 25): UserConnection!
+    webhooks(username: String): [Webhook!]!
+  }
+
+  type Mutation {
+    registerUser(input: RegisterUserInput!): User!
+    deleteUser(username: String!): MutationResult!
+    createWebhook(input: CreateWebhookInput!): Webhook!
+    deleteWebhook(id: ID!): MutationResult!
+  }
+`;
+
+const dateTime = new GraphQLScalarType({
+  name: 'DateTime',
+  serialize(value) {
+    const date = value instanceof Date ? value : new Date(value);
+    if (Number.isNaN(date.getTime())) throw new TypeError('Invalid DateTime value');
+    return date.toISOString();
+  },
+  parseValue(value) {
+    const date = new Date(value);
+    if (Number.isNaN(date.getTime())) throw new TypeError('Invalid DateTime value');
+    return date;
+  },
+  parseLiteral(node) {
+    if (node.kind !== Kind.STRING) throw new TypeError('DateTime must be a string');
+    const date = new Date(node.value);
+    if (Number.isNaN(date.getTime())) throw new TypeError('Invalid DateTime value');
+    return date;
+  },
+});
+
+module.exports = { typeDefs, dateTime };