# Topaz Query

> Topaz Query is an accountless, x402-native HTTP API for normalized EVM blockchain data. Clients pay per successful request with USDC and receive provenance, completeness, and recovery metadata.

Use the API directly at `https://api.topazquery.com`. Start with capabilities and pricing, then issue a resource request. An unpaid request returns HTTP 402 with an x402 v2 `Payment-Required` header. Sign one advertised exact-payment option, retry with `Payment-Signature`, and inspect `Payment-Response` after fulfillment.

## Primary resources

- [API documentation](https://api.topazquery.com/docs): Interactive OpenAPI documentation.
- [OpenAPI document](https://api.topazquery.com/openapi.json): Machine-readable API contract.
- [Capabilities](https://api.topazquery.com/v1/capabilities): Supported chains, resources, filters, and payment configuration.
- [Full agent guide](https://topazquery.com/llms-full.txt): Endpoints, payment flow, examples, schemas, and operational guidance.

## Human-facing resources

- [Topaz Query](https://topazquery.com/): Product overview and wallet-enabled query console.
- [Topaz DEX](https://www.topazdex.com/): Topaz decentralized exchange.
- [Sitemap](https://topazquery.com/sitemap.xml): Canonical indexable pages.