# Fast ## Fast - [Welcome to Fast](https://docs.fast.xyz/readme.md): Build agent payments, x402 APIs, EVM funding, identity lookups, and file attestations with Fast SDKs and CLI tools. - [Choose your Fast tool](https://docs.fast.xyz/get-started/choose-your-tool.md): Match agent payments, paid APIs, EVM funding, identity resolution, and file attestations to the appropriate Fast SDK or CLI. - [AI agent documentation access](https://docs.fast.xyz/get-started/agents.md): Read Fast documentation through Markdown, llms.txt, and GitBook MCP retrieval; find current SDK contracts and recovery guidance. - [Overview](https://docs.fast.xyz/sdk-references/overview.md): Choose Fast TypeScript SDKs for native transactions, AllSet bridging, x402 HTTP payments, identity, and artifact attestations. - [Fast ID and fastid-sdk](https://docs.fast.xyz/sdk-references/identity.md): Fast ID and the @fastxyz/fastid-sdk identity client - [Fast Sign and sign-sdk](https://docs.fast.xyz/sdk-references/signing.md): Fast Sign artifact attestations and the @fastxyz/sign-sdk Node client - [Core SDK Execution](https://docs.fast.xyz/sdk-references/core-sdk-execution.md): Fast-native execution and supported cross-network flows - [fast-sdk](https://docs.fast.xyz/sdk-references/core-sdk-execution/fast-sdk.md): Fast-native account queries, signing, and transactions with @fastxyz/sdk - [allset-sdk](https://docs.fast.xyz/sdk-references/core-sdk-execution/allset-sdk.md): Supported EVM ↔ Fast deposits, withdrawals, and intents with @fastxyz/allset-sdk - [Payment Protocol Adapters](https://docs.fast.xyz/sdk-references/payment-protocol-adapters.md): HTTP-native payment negotiation with the current x402 packages - [x402-sdk](https://docs.fast.xyz/sdk-references/payment-protocol-adapters/x402-sdk.md): Current x402 HTTP payment packages in the Fast SDK monorepo - [x402-client](https://docs.fast.xyz/sdk-references/payment-protocol-adapters/x402-sdk/x402-client.md): Pay for x402-protected HTTP resources with @fastxyz/x402-client - [x402-server](https://docs.fast.xyz/sdk-references/payment-protocol-adapters/x402-sdk/x402-server.md): Protect Express routes with @fastxyz/x402-server - [x402-facilitator](https://docs.fast.xyz/sdk-references/payment-protocol-adapters/x402-sdk/x402-facilitator.md): Verify and settle supported x402 payments with @fastxyz/x402-facilitator - [Funding Abstraction](https://docs.fast.xyz/sdk-references/funding-abstraction.md): On-ramps and off-ramps for getting money into and out of Fast. - [Swapper On-ramp](https://docs.fast.xyz/sdk-references/funding-abstraction/swapper-on-ramp.md) - [REST API](https://docs.fast.xyz/api-reference/rest-api.md): Fast proxy REST API reference for accounts, transactions, tokens, certificates, and escrow; the transport used by FastProvider. - [Transactions](https://docs.fast.xyz/api-reference/rest-api/transactions.md) - [Accounts](https://docs.fast.xyz/api-reference/rest-api/accounts.md) - [Tokens](https://docs.fast.xyz/api-reference/rest-api/tokens.md) - [Certificates](https://docs.fast.xyz/api-reference/rest-api/certificates.md) - [Escrow](https://docs.fast.xyz/api-reference/rest-api/escrow.md) - [Models](https://docs.fast.xyz/api-reference/rest-api/models.md) - [JSON-RPC API](https://docs.fast.xyz/api-reference/json-rpc-api.md): Direct Fast proxy JSON-RPC endpoints and network configuration, distinct from the REST transport used by the core SDK. - [FastSet Protocol](https://docs.fast.xyz/advanced/fastset-protocol.md) - [AllSet Portal](https://docs.fast.xyz/advanced/allset-layer.md) - [AllSet Services Prometheus Metrics](https://docs.fast.xyz/advanced/allset-services-prometheus-metrics.md) - [K Framework and Formal Verification](https://docs.fast.xyz/advanced/k-framework-and-formal-verification.md) - [FAQ](https://docs.fast.xyz/faq.md): Answers about Fast agent payments, SDK selection, networks, settlement, x402 integration, and protocol security assumptions. - [Legal](https://docs.fast.xyz/legal.md) - [Quickstart](https://docs.fast.xyz/get-started-archived/quickstart.md): Add payments to your AI agent in under 2 minutes. - [Core Concepts](https://docs.fast.xyz/get-started-archived/core-concepts.md) - [Use Cases](https://docs.fast.xyz/get-started-archived/use-cases.md) - [Overview](https://docs.fast.xyz/fast-archived/overview.md) - [Core Concepts](https://docs.fast.xyz/fast-archived/core-concepts.md) - [Claims](https://docs.fast.xyz/fast-archived/core-concepts/claims.md) - [Accounts](https://docs.fast.xyz/fast-archived/core-concepts/accounts.md) - [Weak Independence](https://docs.fast.xyz/fast-archived/core-concepts/weak-independence.md) - [Fast Protocol](https://docs.fast.xyz/fast-archived/core-concepts/fast-protocol.md) - [Guarantees and Properties](https://docs.fast.xyz/fast-archived/guarantees-and-properties.md) - [Developers](https://docs.fast.xyz/fast-archived/developers.md) - [Tutorials](https://docs.fast.xyz/fast-archived/developers/tutorials.md) - [Create an account](https://docs.fast.xyz/fast-archived/developers/tutorials/create-an-account.md) - [Fetch next nonce](https://docs.fast.xyz/fast-archived/developers/tutorials/fetch-next-nonce.md) - [Sign a transaction](https://docs.fast.xyz/fast-archived/developers/tutorials/sign-a-transaction.md) - [Fund account from faucet](https://docs.fast.xyz/fast-archived/developers/tutorials/fund-account-from-faucet.md) - [Submit a transaction to proxy](https://docs.fast.xyz/fast-archived/developers/tutorials/submit-a-transaction-to-proxy.md) - [Fast API](https://docs.fast.xyz/fast-archived/developers/fast-api.md) - [Validator API](https://docs.fast.xyz/fast-archived/developers/fast-api/validator-api.md) - [Proxy API](https://docs.fast.xyz/fast-archived/developers/fast-api/proxy-api.md) - [Data types](https://docs.fast.xyz/fast-archived/developers/fast-api/data-types.md) - [RPC Endpoints](https://docs.fast.xyz/fast-archived/developers/rpc-endpoints.md) - [Applications](https://docs.fast.xyz/fast-archived/applications.md) - [Block Verification Explorer](https://docs.fast.xyz/fast-archived/applications/block-verification-explorer.md) - [AllSet and AllSwap](https://docs.fast.xyz/fast-archived/applications/allset-and-allswap.md): A unified layer for cross-chain liquidity and verifiable swaps - [FAQ](https://docs.fast.xyz/fast-archived/faq.md) - [Overview](https://docs.fast.xyz/allset-archived/overview.md) - [Architecture](https://docs.fast.xyz/allset-archived/architecture.md) - [Developers](https://docs.fast.xyz/allset-archived/developers.md) - [Applications](https://docs.fast.xyz/allset-archived/applications.md) - [AllSwap](https://docs.fast.xyz/allset-archived/applications/allswap.md) - [FAQ](https://docs.fast.xyz/allset-archived/faq.md) - [Overview](https://docs.fast.xyz/k-framework-archived/overview.md) - [Formal Semantics](https://docs.fast.xyz/k-framework-archived/overview-1.md) - [LLVM-K Backend](https://docs.fast.xyz/k-framework-archived/llvm-k-backend.md) - [What is "K"? (previous)](https://docs.fast.xyz/k-framework-archived/what-is-k.md) - [Semantics-Based Compilation](https://docs.fast.xyz/k-framework-archived/further-optimizations.md) - [Overview](https://docs.fast.xyz/proof-of-proof-archived/what-is-pop.md) - [Architecture](https://docs.fast.xyz/proof-of-proof-archived/architecture.md): In this guide, we look more closely at the architecture of Proof of Proof and how it works end-to-end. - [Math Proof Generation](https://docs.fast.xyz/proof-of-proof-archived/math-proof-generation.md) - [Math Proof Checker](https://docs.fast.xyz/proof-of-proof-archived/math-proof-checker.md) - [ZK Proof Generation](https://docs.fast.xyz/proof-of-proof-archived/zk-proof-generation.md) - [Applications](https://docs.fast.xyz/proof-of-proof-archived/applications.md) - [Core technologies](https://docs.fast.xyz/proof-of-proof-archived/core-technologies.md) - [Formal Semantics & the K Framework](https://docs.fast.xyz/proof-of-proof-archived/core-technologies/formal-semantics-and-the-k-framework.md) - [Matching Logic](https://docs.fast.xyz/proof-of-proof-archived/core-technologies/matching-logic.md) - [Zero-Knowledge Proofs & zkVMs](https://docs.fast.xyz/proof-of-proof-archived/core-technologies/zero-knowledge-proofs-and-zkvms.md) --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on a page URL with the `ask` query parameter: ``` GET https://docs.fast.xyz/readme.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.