# Tempo charge \[One-time TIP-20 token transfers] The Tempo implementation of the [charge](/intents/charge) intent. The client signs a TIP-20 `transfer` transaction, the server broadcasts it to Tempo, and settlement completes in ~500ms with deterministic finality. This method is best for single API calls, content access, or one-off purchases. ## Server Use [`mppx.charge`](/sdk/typescript/server/Method.tempo.charge) to gate any endpoint behind a one-time payment. The method handles Challenge generation, Credential verification, transaction broadcast, and Receipt creation. ```ts twoslash import { Mppx, tempo } from 'mppx/server' const mppx = Mppx.create({ methods: [tempo()], }) export async function handler(request: Request) { const result = await mppx.charge({ amount: '0.1', currency: '0x20c0000000000000000000000000000000000000', recipient: '0xa726a1CD723409074DF9108A2187cfA19899aCF8', })(request) if (result.status === 402) return result.challenge return result.withReceipt(Response.json({ data: '...' })) } ``` ### With expiry ```ts twoslash import { Mppx, tempo } from 'mppx/server' const mppx = Mppx.create({ methods: [tempo()] }) // ---cut--- import { Expires } from 'mppx' export async function handler(request: Request) { const result = await mppx.charge({ amount: '0.1', currency: '0x20c0000000000000000000000000000000000000', expires: Expires.minutes(10), // [!code hl] recipient: '0xa726a1CD723409074DF9108A2187cfA19899aCF8', })(request) if (result.status === 402) return result.challenge return result.withReceipt(Response.json({ data: '...' })) } ``` ### With fee sponsorship ```ts twoslash import { Mppx, tempo } from 'mppx/server' const mppx = Mppx.create({ methods: [tempo()] }) declare const request: Request // ---cut--- const result = await mppx.charge({ amount: '0.1', currency: '0x20c0000000000000000000000000000000000000', feePayer: true, // [!code hl] recipient: '0xa726a1CD723409074DF9108A2187cfA19899aCF8', })(request) ``` When `feePayer` is `true`, the server adds a fee payer signature (domain `0x78`) before broadcasting. The client doesn't need gas tokens. See [fee sponsorship](/payment-methods/tempo#fee-sponsorship) for details. :::info See [`tempo.charge` server reference](/sdk/typescript/server/Method.tempo.charge) for the full parameter list. ::: ## Client Use [`tempo.charge`](/sdk/typescript/client/Method.tempo.charge) with `Mppx.create` to automatically handle `402` responses. The client parses the Challenge, signs a TIP-20 transfer, and retries with the Credential. ```ts twoslash import { Mppx, tempo } from 'mppx/client' import { privateKeyToAccount } from 'viem/accounts' const account = privateKeyToAccount('0xabc…123') Mppx.create({ methods: [tempo.charge({ account })], }) const response = await fetch('https://api.example.com/resource') ``` ### Without polyfill If you don't want to patch `globalThis.fetch`, use `mppx.fetch` directly: ```ts twoslash import { Mppx, tempo } from 'mppx/client' import { privateKeyToAccount } from 'viem/accounts' const account = privateKeyToAccount('0xabc…123') const mppx = Mppx.create({ polyfill: false, methods: [tempo.charge({ account })], }) const response = await mppx.fetch('https://api.example.com/resource') ``` :::info See [`tempo.charge` client reference](/sdk/typescript/client/Method.tempo.charge) for the full parameter list. ::: ## Specification