Announcing Harmony Mainnet Support

We’re happy to announce that Center.dev now supports Harmony.

Harmony is an EVM-compatible L1 with 2-second transaction finality and 100x lower fees than Ethereum. With its trustless cross-chain bridges, Harmony allows users to easily access other ecosystems including Ethereum while benefitting from the speed and low fees of the Harmony network.

Developers can now use Center’s APIs to build NFT-related applications on Harmony. Center offers a wide suite of functionality that will help you ship your product faster, including access to:

• Ownership and transfer data
• Collection and asset data
• Search
• NFT Rendering
• Market data (e.g., floor price, market cap)

Get started

Building an NFT-related application may seem daunting, but our APIs can help abstract away complex infrastructure details so you can focus on what matters to your users. We already support a wide variety of applications, including NFT marketplaces, wallets, data intelligence tools and portfolio trackers.

Ready to get started?

• Sign up for an API key

Need help or want more information?

• Check out our documentation
• Contact our support team
• Join Center's Discord or Telegram channels
• Follow us on Twitter

Or check out a few examples:

Demo: Search for a collection

Note: Limited to 3 results for display purposes

Request

curl -XGET "<https://api.center.dev/v1/harmony-mainnet/search?query=Harmonauts&limit=3>"

Result

{
  "results": [
    {
      "id": "harmony-mainnet/0x8Af9464D665Aef2036596300033428Ce93ff07b7",
      "name": "Fallen Harmonauts",
      "previewImageUrl": "<https://cdn.center.app/v2/1666600000/811a65e004e03179d40f491fbae18301c2949d965c70a51f397aa4f14daa2646/a002321050e570d31b20678c62aac399ed33ea461a2f360f091acbfd271688cf.png>",
      "relevance": 0,
      "url": "<https://center.app/harmony-mainnet/collections/0x8Af9464D665Aef2036596300033428Ce93ff07b7>",
      "address": "0x8Af9464D665Aef2036596300033428Ce93ff07b7",
      "type": "Collection"
    },
    {
      "id": "harmony-mainnet/0x5C5d3C833a7e0C3Fb5b50eA48C13D8dB063E5505",
      "name": "HARMONAUTS FORCE ONE (AR CARDS)",
      "previewImageUrl": "<https://cdn.center.app/v2/1666600000/77682a01bec8b3ab6c01d3026c44999d482861a5e865e08f32b096fa8d699f10/a5cd90ec4c805e19694be0c4690bb6199bb0d417b0dc8013d28dc39f68335a81.gif>",
      "relevance": 0,
      "url": "<https://center.app/harmony-mainnet/collections/0x5C5d3C833a7e0C3Fb5b50eA48C13D8dB063E5505>",
      "address": "0x5C5d3C833a7e0C3Fb5b50eA48C13D8dB063E5505",
      "type": "Collection"
    },
    {
      "id": "harmony-mainnet/0x6bA33a56f254aC8Ba143844E22f517081ea2cb5B",
      "name": "Harmonauts Exploring Kyiv",
      "previewImageUrl": "<https://cdn.center.app/v2/1666600000/224ed014350eb6092a5605a0def56bbe968c9cae6c6ae7f8490695fac0b22100/903aff28eccf9cdff9fd6324e8805e1789a82f9dffddf7706191695dac2e2a10.png>",
      "relevance": 0,
      "url": "<https://center.app/harmony-mainnet/collections/0x6bA33a56f254aC8Ba143844E22f517081ea2cb5B>",
      "address": "0x6bA33a56f254aC8Ba143844E22f517081ea2cb5B",
      "type": "Collection"
    }
  ]
}

Demo: Return all owners of a collection

Note: Limited to 5 owners for display purposes

Request

curl -XGET "<https://api.center.dev/v1/harmony-mainnet/0xa1a5ace6e83b8a1cad9dbde899ca1a9df978d307/asset-owners?limit=5>"

Result

{
  "items": [
    {
      "token_id": "999295458499946717247564528413538590457631905",
      "owner": "0x1bA296b6C1845A92756Fb56EAc5b8327676ca3E0"
    },
    {
      "token_id": "3232843394762103529983319823561887343584544299",
      "owner": "0x1bA296b6C1845A92756Fb56EAc5b8327676ca3E0"
    },
    {
      "token_id": "9959582486858817961854600824154606259291583064",
      "owner": "0xD70922bbFf62904ACE6682E7F24e47F2493d1da7"
    },
    {
      "token_id": "10836475836738686882327846339852383908935670992",
      "owner": "0xD70922bbFf62904ACE6682E7F24e47F2493d1da7"
    },
    {
      "token_id": "15966508850455920672931756062201706220840636690",
      "owner": "0xD70922bbFf62904ACE6682E7F24e47F2493d1da7"
    }
  ],
  "paging": {
    "offset": 0,
    "limit": 5,
    "onLastPage": false
  }
}

About Center

Center is a multi-chain, high-performance NFT API designed with speed and developer productivity in mind. Our seasoned team has working experience at Coinbase, WhatsApp, Facebook, Google, Square and Paradigm. We’ve led teams and built products where scalability, performance, and security are paramount — and we bring that mindset to everything we build.

To date, Center has indexed over 150TB of NFTs across 14 chains. We offer a a 99.999% uptime SLA and support users ranging from individual hackers to large enterprises.

Our APIs also power center.app, an NFT search engine that we are building. We encourage you to check it out!

What is an NFT API?

Building NFT-related applications from scratch is complicated. It might require indexing multiple chains, ingesting vast quantities of data, and meticulously building low-level infrastructure to ensure all of the data is processed correctly. This could take engineers months to get right before they even start building an application.

Our APIs allow builders to abstract away this complexity and focus on building useful products for end users right away— we take care of the infrastructure and low-level technical details. With just a few lines of code, builders can use our APIs for a range of use cases including NFT rendering, search and data retrieval.

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