Description: Purchase a single domain instantly without adding to cart. Validates domain availability, creates payments and order, then starts the order processing workflow. Payment is taken from the NFSC balance first; any remainder is charged to the credit card saved on the Namefi profile. Card legs are at least $1.00 — when the shortfall is smaller, the card is charged $1.00 and correspondingly less NFSC is used. If neither rail covers the price, the request fails with links to top up NFSC or save a card. The `payments` array in the response shows the planned split; legs are charged asynchronously after the order is created. Instructions: 1. MCP tool arguments use a wrapper object: { headers, body }. 2. Put authentication headers inside headers. Do not rely on the outer MCP HTTP request headers for tool authentication. 3. Put the procedure payload inside body.payload. 4. For EIP-712 signed calls, build the full signed envelope in body using payload, payloadType, nonce, and timestamp. Fetch signing metadata with getEip712Domain and getEip712TypesForMethod using method="registerDomain". 5. For EIP-712, include these headers in headers: x-namefi-signer: , x-namefi-signature: <0x-prefixed typed-data signature>, x-namefi-eip712-type: . 6. For SIWE auth, include x-namefi-siwe-token: in headers and prepare it with getSiweNonce, prepareSiweMessage, verifySiweSignature, and getAllowedChains. 7. If you call through 1ShotPay, also include x-oneshot-singed-on-behalf: in headers. EIP-712 Details: Signing Domain: {"name":"Namefi","version":"1"} Accepted Primary Types: InstantRegisterDomainEnvelope, InstantRegisterDomainDefaultWalletEnvelope EIP-712 Types: { "InstantRegisterDomainEnvelope_Payload_DomainSetupOptions": [ { "name": "autoPark", "type": "bool" }, { "name": "autoEns", "type": "bool" }, { "name": "autoRenew", "type": "bool" }, { "name": "dnssec", "type": "bool" }, { "name": "keepExistingNameservers", "type": "bool" } ], "InstantRegisterDomainEnvelope_Payload_NftReceivingWallet": [ { "name": "chainId", "type": "uint256" } ], "InstantRegisterDomain": [ { "name": "normalizedDomainName", "type": "string" }, { "name": "durationInYears", "type": "uint256" }, { "name": "domainSetupOptions", "type": "InstantRegisterDomainEnvelope_Payload_DomainSetupOptions" }, { "name": "nftReceivingWallet", "type": "InstantRegisterDomainEnvelope_Payload_NftReceivingWallet" } ], "InstantRegisterDomainEnvelope": [ { "name": "payloadType", "type": "string" }, { "name": "payload", "type": "InstantRegisterDomain" }, { "name": "timestamp", "type": "uint256" }, { "name": "nonce", "type": "string" } ], "InstantRegisterDomainDefaultWalletEnvelope_Payload_DomainSetupOptions": [ { "name": "autoPark", "type": "bool" }, { "name": "autoEns", "type": "bool" }, { "name": "autoRenew", "type": "bool" }, { "name": "dnssec", "type": "bool" }, { "name": "keepExistingNameservers", "type": "bool" } ], "InstantRegisterDomainDefaultWallet": [ { "name": "normalizedDomainName", "type": "string" }, { "name": "durationInYears", "type": "uint256" }, { "name": "domainSetupOptions", "type": "InstantRegisterDomainDefaultWalletEnvelope_Payload_DomainSetupOptions" } ], "InstantRegisterDomainDefaultWalletEnvelope": [ { "name": "payloadType", "type": "string" }, { "name": "payload", "type": "InstantRegisterDomainDefaultWallet" }, { "name": "timestamp", "type": "uint256" }, { "name": "nonce", "type": "string" } ] } Example body for InstantRegisterDomainEnvelope: { "payload": { }, "payloadType": "InstantRegisterDomain", "nonce": "", "timestamp": } Example body for InstantRegisterDomainDefaultWalletEnvelope: { "payload": { }, "payloadType": "InstantRegisterDomainDefaultWallet", "nonce": "", "timestamp": } Related Tools: - getEip712Domain, getEip712TypesForMethod, getAllEip712Types - getSiweNonce, prepareSiweMessage, verifySiweSignature, getAllowedChains