Call Zerion API without an API key by paying per request in USDC on Tempo with the Machine Payments Protocol. No signup, rate limits, or monthly plan.
MPP (Machine Payments Protocol) is an open protocol for pay-per-request HTTP access. Instead of an API key, you pay a small amount of USDC on Tempo for each request. This model is ideal for AI agents that need onchain data without managing subscriptions or key rotation.This is an alternative authorization method for the same Zerion API. Endpoints, JSON:API responses, query parameters, and filters all behave exactly as in the rest of the docs. Only the way you prove access changes.Zerion also supports x402, a sibling protocol that settles on Base or Solana. See Authentication for an overview of all access methods.
Quickstart with the Zerion CLI
The easiest way to use MPP is with the Zerion CLI, which handles the payment handshake, wallet signing, and retries automatically.Set an EVM private key for a wallet that holds USDC on Tempo, then make a request with --mpp:
Set ZERION_MPP=true to enable MPP globally for analytics commands instead of passing --mpp on every call. If you already use WALLET_PRIVATE_KEY for x402, the same key works for MPP - or set TEMPO_PRIVATE_KEY to use a different wallet for Tempo.
Direct integration
If you’re not using the CLI, use one of the official MPP SDKs (TypeScript, Python, Go, Rust) to handle payment construction and retries. You’ll need a wallet with USDC on Tempo and its EVM private key.
Example
import { privateKeyToAccount } from 'viem/accounts'import { Mppx, tempo } from 'mppx/client'Mppx.create({ methods: [tempo({ account: privateKeyToAccount(process.env.WALLET_PRIVATE_KEY) })],})// Global fetch now handles 402 automaticallyconst res = await fetch( 'https://api.zerion.io/v1/wallets/0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045/portfolio')const data = await res.json()
How it works
The card at the top of this page plays this exchange:
Client sends a request to an API endpoint
Server returns 402 with a WWW-Authenticate: Payment challenge describing where and how much to pay
Client signs a USDC transfer on Tempo and retries with an Authorization: Payment header
Zerion verifies the credential with the MPP facilitator and returns the response
Rate limits
None. You pay per request, with no per-second or monthly quota.
Error handling
402 Payment required - no or invalid payment credential. Inspect the WWW-Authenticate: Payment response header for a fresh challenge and retry.
402 MPP payment rejected - the facilitator rejected the credential. The detail field contains the reason (e.g. insufficient funds, expired authorization).
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No signup, rate limits, or monthly plan.","href":"/build-with-ai/mpp"},"description":{"compiledSource":"\"use strict\";\nconst {jsx: _jsx} = arguments[0];\nconst {useMDXComponents: _provideComponents} = arguments[0];\nfunction _createMdxContent(props) {\n const _components = {\n p: \"p\",\n ..._provideComponents(),\n ...props.components\n };\n return _jsx(_components.p, {\n children: \"Call Zerion API without an API key by paying per request in USDC on Tempo with the Machine Payments Protocol. No signup, rate limits, or monthly plan.\"\n });\n}\nfunction MDXContent(props = {}) {\n const {wrapper: MDXLayout} = {\n ..._provideComponents(),\n ...props.components\n };\n return MDXLayout ? _jsx(MDXLayout, {\n ...props,\n children: _jsx(_createMdxContent, {\n ...props\n })\n }) : _createMdxContent(props);\n}\nreturn {\n default: MDXContent\n};\n","frontmatter":{},"scope":{}},"pageType":"default","mdx":{"mdxSource":{"compiledSource":"\"use strict\";const{Fragment:_Fragment,jsx:_jsx,jsxs:_jsxs}=arguments[0];const{useMDXComponents:_provideComponents}=arguments[0];const PayHero=({protocol=`x402`})=>{const P={x402:{logo:_jsxs(`svg`,{className:`pay-logo`,viewBox:`0 0 486.3 187.4`,role:`img`,\"aria-label\":`x402`,children:[_jsx(`path`,{d:`M10.5,59.5c.6-.6,1.6-.6,2.3,0l50.9,50.9,19.5-19.5c.6-.6,1.6-.6,2.3,0l10,10c.6.6.6,1.7,0,2.3l-14.4,14.4v10.4l45.8,45.8c.6.6.6,1.7,0,2.3l-10,10c-.6.6-1.6.6-2.3,0l-50.9-50.9-50.9,50.9c-.6.6-1.6.6-2.3,0L.5,176.1c-.6-.6-.6-1.7,0-2.3l45.8-45.8v-10.4L.5,71.8c-.6-.6-.6-1.7,0-2.3l10-10Z`}),_jsx(`path`,{d:`M374.1,151.7c0-2.5,1-4.9,2.7-6.7l91-93.6c.4-.5.7-1.1.7-1.7v-7.4c0-.6-.2-1.2-.7-1.7l-18.9-19.9c-.4-.5-1.1-.7-1.7-.7h-37.9c-.6,0-1.3.3-1.7.7l-22.9,23c-.9.9-2.5.9-3.4,0l-9.1-9.1c-.9-.9-.9-2.5,0-3.4l26-26c1.8-1.8,4.3-2.8,6.8-2.8h46.7c2.6,0,5.2,1.1,7,3l24.9,26.1c1.7,1.8,2.7,4.2,2.7,6.7v15.9c0,2.5-1,4.9-2.7,6.7l-91,93.6c-.4.5-.7,1.1-.7,1.7v11.4c0,1.3,1.1,2.4,2.4,2.4h89.6c1.3,0,2.4,1.1,2.4,2.4v12.9c0,1.3-1.1,2.4-2.4,2.4h-100.1c-5.3,0-9.7-4.3-9.7-9.7v-26.1Z`}),_jsx(`path`,{d:`M317.9,2.2c17.8,0,32.2,14.4,32.2,32.2v121.6c-.4,17.1-14.2,30.9-31.3,31.4h-41.2c-17.1-.4-30.9-14.2-31.3-31.4v-.8s0-120.8,0-120.8c0-17.8,14.4-32.2,32.2-32.2h39.5ZM263.8,144.8v10.5c0,8,6.5,14.5,14.5,14.5h39.5c8,0,14.5-6.5,14.5-14.5v-79l-68.5,68.6ZM278.3,19.9c-8,0-14.5,6.5-14.5,14.5v85.3l68.5-68.6v-16.7c0-8-6.5-14.5-14.5-14.5h-39.5Z`}),_jsx(`path`,{d:`M199.3,0c1.3,0,2.4,1.1,2.4,2.4v78.6c0,1.3,1.1,2.4,2.4,2.4h17.3c1.3,0,2.4,1.1,2.4,2.4v12.9c0,1.3-1.1,2.4-2.4,2.4h-17.3c-1.3,0-2.4,1.1-2.4,2.4v81.5c0,1.3-1.1,2.4-2.4,2.4h-12.9c-1.3,0-2.4-1.1-2.4-2.4v-81.5c0-1.3-1.1-2.4-2.4-2.4h-60.8c-.6,0-1.3-.3-1.7-.7l-21-21c-.9-.9-.9-2.5,0-3.4L172.9.7c.5-.5,1.1-.7,1.7-.7h24.7ZM123,76c-.9.9-.9,2.5,0,3.4l3.3,3.3c.5.5,1.1.7,1.7.7h53.5c1.3,0,2.4-1.1,2.4-2.4V19.9c0-1.2-1-2.2-2.2-2.2s-1.1.2-1.5.6l-57.3,57.6Z`})]}),head:`→ Pay per request. 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272`,children:[_jsx(`path`,{d:`M292.851 249.19C242.657 222.066 181.584 186.893 135.62 158.223C122.058 148.453 128.941 127.716 145.332 127.716H372.764C385.451 127.716 393.938 141.861 387.58 152.565C372.297 178.96 349.986 212.471 331.349 239.041C321.345 253.302 305.042 255.752 292.851 249.19Z`}),_jsx(`path`,{d:`M219.645 257.998C268.177 283.868 336.191 323.212 384.518 352.961C399.451 362.177 393.501 384.284 376.06 384.284C347.52 384.284 301.144 384.292 255.009 384.299C209.35 384.306 163.926 384.313 136.261 384.313C122.32 384.313 115.175 369.847 121.095 359.756C141.103 325.662 163.589 291.246 182.284 265.552C190.597 254.09 207.513 251.523 219.645 257.998Z`})]})})]})]}),_jsxs(`div`,{className:`pay-log`,children:[_jsxs(`div`,{className:`pay-l pay-l1`,children:[_jsx(`span`,{className:`pay-dir`,children:`→`}),_jsx(`span`,{className:`pay-m`,children:`GET`}),` /v1/wallets/0xd8dA…6045/portfolio`]}),_jsxs(`div`,{className:`pay-l 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_components={a:`a`,code:`code`,li:`li`,ol:`ol`,p:`p`,pre:`pre`,span:`span`,ul:`ul`,..._provideComponents(),...props.components},{CodeBlock,Heading,Tip,_MdxComponentBoundary}=_components;if(!CodeBlock)_missingMdxReference(`CodeBlock`,true);if(!Heading)_missingMdxReference(`Heading`,true);if(!Tip)_missingMdxReference(`Tip`,true);if(!_MdxComponentBoundary)_missingMdxReference(`_MdxComponentBoundary`,true);return _jsxs(_Fragment,{children:[_jsx(_MdxComponentBoundary,{name:`PayHero`,children:_jsx(PayHero,{protocol:`mpp`})}),`\n`,_jsxs(_components.p,{children:[`MPP (`,_jsx(_components.a,{href:`https://mpp.dev`,children:`Machine Payments Protocol`}),`) is an open protocol for pay-per-request HTTP access. Instead of an API key, you pay a small amount of USDC on Tempo for each request. This model is ideal for AI agents that need onchain data without managing subscriptions or key rotation.`]}),`\n`,_jsx(_components.p,{children:`This is an alternative authorization method for the same Zerion API. Endpoints, JSON:API responses, query parameters, and filters all behave exactly as in the rest of the docs. Only the way you prove access changes.`}),`\n`,_jsxs(_components.p,{children:[`Zerion also supports `,_jsx(_components.a,{href:`/build-with-ai/x402`,children:`x402`}),`, a sibling protocol that settles on Base or Solana. See `,_jsx(_components.a,{href:`/authentication`,children:`Authentication`}),` for an overview of all access methods.`]}),`\n`,_jsx(Heading,{level:`2`,id:`quickstart-with-the-zerion-cli`,children:`Quickstart with the Zerion CLI`}),`\n`,_jsxs(_components.p,{children:[`The easiest way to use MPP is with the `,_jsx(_components.a,{href:`/build-with-ai/zerion-cli`,children:`Zerion CLI`}),`, which handles the payment handshake, wallet signing, and retries automatically.`]}),`\n`,_jsxs(_components.p,{children:[`Set an EVM private key for a wallet that holds USDC on Tempo, then make a request with `,_jsx(_components.code,{children:`--mpp`}),`:`]}),`\n`,_jsx(CodeBlock,{filename:``,numberOfLines:`2`,language:`shellscript`,children:_jsx(_components.pre,{className:`shiki shiki-themes github-light-default dark-plus`,style:{backgroundColor:`#ffffff`,\"--shiki-dark-bg\":`#0B0C0E`,color:`#1f2328`,\"--shiki-dark\":`#D4D4D4`},language:`shellscript`,children:_jsxs(_components.code,{language:`shellscript`,numberOfLines:`2`,children:[_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#569CD6`},children:`export`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#9CDCFE`},children:` WALLET_PRIVATE_KEY`}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#D4D4D4`},children:`=`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:`\"0x...\"`})]}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#953800`,\"--shiki-dark\":`#DCDCAA`},children:`zerion-cli`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` wallet`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` portfolio`}),_jsx(_components.span,{style:{color:`#0550AE`,\"--shiki-dark\":`#B5CEA8`},children:` 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045`}),_jsx(_components.span,{style:{color:`#0550AE`,\"--shiki-dark\":`#569CD6`},children:` --mpp`})]}),`\n`]})})}),`\n`,_jsx(Tip,{children:_jsxs(_components.p,{children:[`Set `,_jsx(_components.code,{children:`ZERION_MPP=true`}),` to enable MPP globally for analytics commands instead of passing `,_jsx(_components.code,{children:`--mpp`}),` on every call. If you already use `,_jsx(_components.code,{children:`WALLET_PRIVATE_KEY`}),` for x402, the same key works for MPP - or set `,_jsx(_components.code,{children:`TEMPO_PRIVATE_KEY`}),` to use a different wallet for Tempo.`]})}),`\n`,_jsx(Heading,{level:`2`,id:`direct-integration`,children:`Direct integration`}),`\n`,_jsxs(_components.p,{children:[`If you’re not using the CLI, use one of the `,_jsx(_components.a,{href:`https://mpp.dev/sdk`,children:`official MPP SDKs`}),` (TypeScript, Python, Go, Rust) to handle payment construction and retries. 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`}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#C586C0`},children:`from`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` 'viem/accounts'`})]}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#C586C0`},children:`import`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:` { `}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#9CDCFE`},children:`Mppx`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:`, `}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#9CDCFE`},children:`tempo`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:` } `}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#C586C0`},children:`from`}),_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` 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`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#9CDCFE`},children:`account:`}),_jsx(_components.span,{style:{color:`#8250DF`,\"--shiki-dark\":`#DCDCAA`},children:` privateKeyToAccount`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:`(`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#9CDCFE`},children:`process`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:`.`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#9CDCFE`},children:`env`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:`.`}),_jsx(_components.span,{style:{color:`#0550AE`,\"--shiki-dark\":`#4FC1FF`},children:`WALLET_PRIVATE_KEY`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:`) })],`})]}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:`})`})}),`\n`,_jsx(_components.span,{className:`line`}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{style:{color:`#6E7781`,\"--shiki-dark\":`#6A9955`},children:`// Global fetch now handles 402 automatically`})}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#569CD6`},children:`const`}),_jsx(_components.span,{style:{color:`#0550AE`,\"--shiki-dark\":`#4FC1FF`},children:` res`}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#D4D4D4`},children:` =`}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#C586C0`},children:` await`}),_jsx(_components.span,{style:{color:`#8250DF`,\"--shiki-dark\":`#DCDCAA`},children:` fetch`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:`(`})]}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{style:{color:`#0A3069`,\"--shiki-dark\":`#CE9178`},children:` 'https://api.zerion.io/v1/wallets/0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045/portfolio'`})}),`\n`,_jsx(_components.span,{className:`line`,children:_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#D4D4D4`},children:`)`})}),`\n`,_jsxs(_components.span,{className:`line`,children:[_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#569CD6`},children:`const`}),_jsx(_components.span,{style:{color:`#0550AE`,\"--shiki-dark\":`#4FC1FF`},children:` data`}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#D4D4D4`},children:` =`}),_jsx(_components.span,{style:{color:`#CF222E`,\"--shiki-dark\":`#C586C0`},children:` await`}),_jsx(_components.span,{style:{color:`#1F2328`,\"--shiki-dark\":`#9CDCFE`},children:` 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header`]}),`\n`,_jsx(_components.li,{children:`Zerion verifies the credential with the MPP facilitator and returns the response`}),`\n`]}),`\n`,_jsx(Heading,{level:`2`,id:`rate-limits`,children:`Rate limits`}),`\n`,_jsx(_components.p,{children:`None. You pay per request, with no per-second or monthly quota.`}),`\n`,_jsx(Heading,{level:`2`,id:`error-handling`,children:`Error handling`}),`\n`,_jsxs(_components.ul,{children:[`\n`,_jsxs(_components.li,{children:[_jsx(_components.code,{children:`402 Payment required`}),` - no or invalid payment credential. Inspect the `,_jsx(_components.code,{children:`WWW-Authenticate: Payment`}),` response header for a fresh challenge and retry.`]}),`\n`,_jsxs(_components.li,{children:[_jsx(_components.code,{children:`402 MPP payment rejected`}),` - the facilitator rejected the credential. The `,_jsx(_components.code,{children:`detail`}),` field contains the reason (e.g. insufficient funds, expired authorization).`]}),`\n`]})]})}function MDXContent(props={}){const{wrapper:MDXLayout}={..._provideComponents(),...props.components};return MDXLayout?_jsx(MDXLayout,{...props,children:_jsx(_createMdxContent,{...props})}):_createMdxContent(props)}return{PayHero,default:MDXContent};function _missingMdxReference(id,component){throw new Error(`Expected `+(component?`component`:`object`)+\" `\"+id+\"` to be defined: you likely forgot to import, pass, or provide it.\")}","frontmatter":{},"scope":{"config":{},"pageMetadata":{"title":"MPP payments: pay-per-request Zerion API access","sidebarTitle":"MPP payments","description":"Call Zerion API without an API key by paying per request in USDC on Tempo with the Machine Payments Protocol. 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