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Research

A Practical Guide to HMAC Authentication for REST API Endpoints

Learn how to implement HMAC authentication for secure REST API endpoints. Discover practical steps, best practices, and how crypto APIs like Token Metrics safeguard your applications.
Token Metrics Team
6
MIN
Index

Securing REST API endpoints has become a fundamental concern for developers, especially as sensitive data and critical operations traverse the web. Choosing the right authentication process is vital, and one approach—HMAC (Hash-Based Message Authentication Code)—provides a robust mechanism to ensure secure and tamper-proof communications. But how exactly do you implement HMAC authentication for a REST API endpoint in practice?

What is HMAC Authentication?

HMAC, or Hash-Based Message Authentication Code, is a cryptographic technique that combines a secret key with a message (such as an HTTP request) and then hashes the combination using a secure hash algorithm (like SHA-256). The output hash, called the HMAC signature, is sent along with the API request. On the server side, the same process is repeated to confirm the authenticity and integrity of the request.

This approach protects against request tampering and eavesdropping because only someone with the shared secret key can generate a valid HMAC signature. Unlike basic authentication, which sends credentials with every request, HMAC signatures help defend APIs against replay attacks and man-in-the-middle threats. Additionally, as requested data is included in the signature, any changes during transit will invalidate the signature and trigger security alerts.

Why Use HMAC for REST API Authentication?

REST APIs are widely adopted due to their scalability, simplicity, and statelessness. However, such characteristics make them attractive targets for unauthorized actors. The benefits of using HMAC authentication for REST APIs include:

  • Integrity & Authenticity: Every request is verified using a unique signature, ensuring that data has not been altered in transit.
  • Replay Attack Protection: HMAC implementations often incorporate timestamps or unique nonces, preventing reuse of intercepted requests.
  • Credential Privacy: With HMAC, the secret key is never transmitted over the network, reducing exposure risk.
  • Lightweight Security: HMAC is computationally efficient compared to more resource-intensive methods like asymmetric cryptography, making it suitable for high-throughput applications or microservices.

Financial institutions, crypto APIs, and enterprise SaaS solutions often favor HMAC as a standard defense mechanism for their public endpoints.

Step-by-Step: Implementing HMAC Authentication

Below is a practical workflow to implement HMAC authentication on your REST API endpoint:

  1. Generate and Distribute API Keys: Each client receives a unique API key and secret. The secret must be safely stored on the client and never exposed.
  2. Prepare HTTP Request Data: Define the data included in the signature, typically a combination of HTTP method, endpoint, query string, body, timestamp, and sometimes a nonce for uniqueness.
  3. Create the HMAC Signature: The client concatenates the necessary request elements in a specific order, hashes them with the secret key using an algorithm like HMAC-SHA-256, and produces a signature.
  4. Send the Request with Signature: The client places the resulting HMAC signature and related headers (API key, timestamp, nonce) into each API request—commonly within HTTP headers or the Authorization field.
  5. Server-Side Verification: Upon receiving the request, the server retrieves the API secret (based on the provided API key), reconstructs the signing string, computes its own HMAC signature, and compares it to the one sent by the client.
  6. Grant or Deny Access: If the signatures and provided timestamps match and the request falls within an acceptable window, the request is processed. Otherwise, it is rejected as unauthorized.

An example Authorization header might look like:

Authorization: HMAC apiKey="abc123", signature="d41d8cd98f00b204e9800998ecf8427e", timestamp="1660000000", nonce="fGh8Kl"

Always use time-based mechanisms and nonces to prevent replay. For REST APIs built in Python, Node.js, or Java, popular libraries are available to generate and validate HMAC signatures. Ensure secure storage of all secrets and keys—never hard-code them in source files or share them over email.

HMAC Implementation Best Practices

Even well-designed authentication processes can be vulnerable if not properly managed. To maximize HMAC's security benefits, follow these best practices:

  • Rotate Keys Regularly: Implement a lifecycle for API secrets and automate rotation policies to mitigate risks from key compromise.
  • Use Secure Algorithms: Stick to industry standards like SHA-256; avoid outdated hash functions such as MD5 or SHA-1.
  • HTTPS Only: Transmit all API traffic over HTTPS to further protect against network-level attacks—even though the secret is never sent directly.
  • Implement Rate Limiting: Guard against brute-force attempts or webhook floods by capping request rates per user or IP.
  • Comprehensive Logging & Monitoring: Track failed authentication attempts and alert on anomalies for early incident response.

Furthermore, document the required signature format and header structure for your API consumers to minimize implementation errors.

HMAC in the Crypto API Landscape

HMAC authentication is standard in the world of cryptocurrency APIs, where secure and rapid access to on-chain data and market signals is paramount. Leading blockchain data providers, crypto trading platforms, and analytic tools incorporate some variant of HMAC to manage authentication and authorization.

For developers building trading bots, portfolio trackers, or AI-driven analysis platforms, HMAC-protected REST endpoints are both flexible and secure. They allow granular control of permissions and can support high-frequency interactions without the heavy computational load of asymmetric encryption systems.

As the crypto ecosystem evolves, API authentication standards must adapt. Devs should look for providers and platforms—like Token Metrics—that offer transparent, HMAC-secured endpoints and clear implementation guidelines.

Build Smarter Crypto Apps & AI Agents with Token Metrics

Token Metrics provides real-time prices, trading signals, and on-chain insights all from one powerful API. Grab a Free API Key

Frequently Asked Questions

What different algorithms can I use for HMAC?

The most common algorithms are HMAC-SHA-256 and HMAC-SHA-512, both providing strong security. Avoid using outdated algorithms like MD5 or SHA-1 due to known vulnerabilities. HMAC's flexibility allows other hash functions, but always prioritize well-supported, secure industry standards.

How are HMAC secrets shared and stored?

API secrets are typically generated and securely shared out-of-band (e.g., within a secure dashboard or encrypted email during onboarding). On the client, store secrets in environment variables or encrypted secrets managers; on the server, keep secrets in secure databases and never log them.

Is HMAC better than OAuth or JWT for APIs?

HMAC and OAuth/JWT are different approaches. HMAC is simpler, faster, and well-suited for service-to-service API authentication. OAuth and JWT, meanwhile, support more sophisticated user-based access or delegated authorization. The best choice depends on your use case and security goals.

Can HMAC protect against all types of API attacks?

HMAC is excellent for ensuring integrity and authenticity, but is not a complete solution against all attacks. Use it in combination with HTTPS, strict input validation, throttle policies, and regular security reviews. Comprehensive threat protection requires defense in depth.

How do I test my HMAC implementation?

Test both client and server components by intentionally altering requests to ensure invalid signatures are rejected. Use available unit tests, API mocking tools, and logging to confirm signatures are computed and validated as expected. Rotate secrets during testing to check for proper handling.

Disclaimer

This content is for informational and educational purposes only. It does not constitute security advice or endorse any provider. Implementation details may vary by project and threat model. Always consult with professional security experts to ensure compliance and best practices.

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Token Metrics Team
Token Metrics Team

Recent Posts

Research

Mastering API Rate Limits: Reliable Crypto Data Integration

Token Metrics Team
6
MIN

APIs are the backbone of most crypto applications, delivering vital real-time market prices, on-chain analytics, and network signals. Yet, while integrating a crypto data endpoint is powerful, developers quickly discover a common pain point: API rate limits. Mishandling these constraints can cause data gaps, failed requests, or even temporary bans—potentially compromising user experience or the accuracy of your analytics. Understanding how to manage API rate limits effectively ensures stable, scalable access to critical blockchain information.

Understanding API Rate Limits and Why They Exist

API rate limits are enforced restrictions on how many requests a client can send to an endpoint within a defined period—such as 60 requests per minute or 1,000 per day. Crypto data providers implement these limits to maintain their infrastructure stability, prevent abuse, and ensure fair resource allocation for all clients. The most common rate-limiting strategies include:

  • Fixed Window Limiting: A set number of requests per calendar window, resetting at defined intervals.
  • Sliding Window Limiting: Counts requests within a moving window, allowing more flexibility and better smoothing of spikes.
  • Token Buckets and Leaky Buckets: Algorithm-based approaches to queue, throttle, and allow bursting of requests within defined thresholds.

Unintentional breaches—like a runaway script or a poorly timed batch request—will result in HTTP 429 errors (“Too Many Requests”), potentially leading to temporary blocks. Therefore, proactively understanding rate limits is crucial for both robust integrations and courteous API consumption.

Detecting and Interpreting Rate Limit Errors in Crypto APIs

When your app or research tool interacts with a crypto data API, receiving a rate-limit error is an opportunity to optimize, not a dead end. Most reputable API providers, including those specializing in crypto, supplement response headers with usage limits and reset timers. Key signals to watch for:

  • Status Code 429: This HTTP response explicitly signals that you’ve exceeded the allowed request quota.
  • Response Headers: Look for headers like X-RateLimit-Limit, X-RateLimit-Remaining, and X-RateLimit-Reset. These values tell you your total quota, remaining requests, and when you can send requests again.
  • Error Messages: Many APIs provide contextual messages to guide backoff or retry behavior—pay close attention to any documentation or sample payloads.

Building logic into your client to surface or log these errors is essential. This helps in troubleshooting, performance monitoring, and future-proofing your systems as API usage scales.

Strategies to Handle API Rate Limits Effectively

Efficient handling of API rate limits is key for building dependable crypto apps, trading dashboards, and automated research agents. Here are recommended strategies:

  1. Implement Exponential Backoff and Retry Logic: Instead of retrying immediately on failure, wait progressively longer spans when facing 429 errors. This reduces the likelihood of repeated rejections and aligns with reputable rate-limiting frameworks.
  2. Utilize API Response Headers: Programmatically monitor quota headers; pause or throttle requests once the remaining count approaches zero.
  3. Batch and Cache Data: Where possible, batch queries and cache common results. For instance, if you repeatedly request current BTC prices or ERC-20 token details, store and periodically refresh the data instead of fetching each time.
  4. Distribute Requests: If integrating multiple endpoints or accounts, round-robin or stagger calls to mitigate bursts that could breach per-user or per-IP limits.
  5. Plan for Rate-Limit Spikes: Design your system to degrade gracefully when access is temporarily halted—queue requests, retry after the X-RateLimit-Reset time, or show cached info with a ‘refresh’ indicator.

These techniques not only ensure consistent access but also demonstrate good API citizenship, which can be crucial if you later negotiate higher access tiers or custom SLAs with a provider.

Choosing the Right Crypto Data API Provider and Access Plan

Providers vary widely in their rate limit policies—public/free APIs typically impose strict quotas, while premium plans offer greater flexibility. When selecting an API for your crypto project, assess:

  • Request Quotas: Are the given free or paid rate limits sufficient based on your projected usage and scaling plans?
  • Available Endpoints: Can you consolidate data (e.g., batch price endpoints) to reduce total requests?
  • Historical vs. Real-Time Data: Does your use case require tick-by-tick data, or will periodic snapshots suffice?
  • Support for Webhooks or Streaming: Some providers offer webhooks or WebSocket feeds, greatly reducing the need for frequent polling and manual rate limit management.
  • Transparency and Documentation: Comprehensive docs and explicit communication on limits, error codes, and upgrade paths make long-term integration smoother.

Regulatory and operational needs can also influence choice—some institutional settings require SLAs or security controls only available on enterprise tiers.

Unlocking Reliability with AI and Automation

The rise of AI agents and automated research scripts has made dynamic API rate-limit management even more critical. Advanced systems can:

  • Dynamically Adjust Polling Rates: Use monitoring or predictive AI to modulate fetching frequency based on quota and data volatility.
  • Contextual Decision-Making: Pause or prioritize high-value queries when usage nears the quota, supporting mission-critical research without service interruptions.
  • Error Pattern Analysis: Leverage logs to identify patterns in rate limit hits, optimizing workflows without manual intervention.

Solutions like Token Metrics combine robust crypto APIs with AI-driven research—offering developers programmable access and insights while simplifying best-practice integration and rate management.

Build Smarter Crypto Apps & AI Agents with Token Metrics

Token Metrics provides real-time prices, trading signals, and on-chain insights all from one powerful API. Grab a Free API Key

FAQs About Handling API Rate Limits with Crypto Data Endpoints

What happens if I ignore API rate limits?

If you consistently exceed rate limits, you'll likely receive 429 errors, experience dropped requests, and risk a temporary or permanent ban. Responsible handling is essential for reliable data access.

Can I bypass rate limits by using multiple accounts?

Attempting to circumvent limits by creating many accounts or cycling IPs is discouraged and may violate API terms of use. It's better to work with providers for a proper upgrade or optimization strategy.

What libraries or tools help with rate limit handling?

Popular HTTP libraries like Axios (JavaScript), requests (Python), and HTTPX have built-in or community-supported retry/backoff plugins. Check your API ecosystem for recommended middlewares or SDKs supporting rate-limiting logic.

How does rate limiting differ between major crypto API providers?

Each provider implements unique quotas: some limit based on IP, API key, or endpoint type, and some support higher throughput via premium plans or batch querying. Always review documentation for specifics.

Should I contact support if I need higher API limits?

Yes. Many crypto API services offer tailored plans or enterprise integrations with higher quotas. Proactively communicating your use case helps unlock better terms and ensures ongoing support.

Disclaimer

This content is for educational and informational purposes only. It does not constitute investment advice, recommendation, or an offer to buy or sell any financial instrument. Use all APIs and tools in accordance with their terms and applicable regulations.

Research

How to Retrieve Bitcoin’s Current Price Using Public Crypto APIs

Token Metrics Team
6
MIN

Whether you're building a crypto dashboard, conducting blockchain research, or creating an automated trading bot, access to real-time Bitcoin pricing is essential. But how do developers and data analysts retrieve the current price of Bitcoin from a public crypto API—and what are the key considerations when choosing an API for this purpose?

Why Crypto APIs Are Core to Bitcoin Price Data

Crypto APIs—or Application Programming Interfaces—are structured gateways that let apps, bots, or websites communicate seamlessly with live crypto data sources. Instead of manually visiting exchanges or aggregators, an API call instantly delivers Bitcoin's current price in a standardized, machine-readable format. This capability underpins everything from price tickers to advanced algorithmic and AI-driven research tools.

Several types of organizations offer public crypto APIs, including:

  • Aggregators (e.g., CoinGecko, CoinMarketCap): Offer data across many exchanges for robust average pricing.
  • Exchanges (e.g., Binance, Coinbase Pro): Provide real-time prices directly from their order books.
  • Analytical Platforms (e.g., Token Metrics): Deliver prices alongside signals and on-chain analytics.

Public APIs generally support unauthenticated (no login) endpoints for basic pricing, though many now require an API key for higher request rates and advanced data. Whether you’re a beginner or building a sophisticated AI agent, choosing the right crypto API—and querying it appropriately—is the foundational step.

Step-by-Step: Retrieving Bitcoin’s Price from a Public API

The most straightforward way to retrieve Bitcoin's current price is to query a reputable crypto API from your application or terminal. Here’s a typical workflow:

  1. Choose Your API Provider. Start by selecting a reliable public crypto API such as CoinGecko, CoinMarketCap, Binance, or Token Metrics.
  2. Get Access Credentials. Many APIs are open for public use, but some require you to register and obtain a (usually free) API key to access their endpoints or avoid rate limiting.
  3. Consult API Documentation. Every provider publishes documentation describing the endpoints for price data. For example, CoinGecko’s endpoint for Bitcoin’s current price is:
    https://api.coingecko.com/api/v3/simple/price?ids=bitcoin&vs_currencies=usd
  4. Send an HTTP Request. You can use programming languages (like Python or JavaScript), command-line tools (such as curl), or even browser-based REST clients to send a GET request to the endpoint.
  5. Parse the API Response. Responses are typically in JSON format. For the above CoinGecko endpoint, you might receive:
    { "bitcoin": { "usd": 43000 } }
  6. Integrate and Refresh. Decide how often to refresh the price in your app (e.g., every 10 seconds for real-time, every minute for dashboards), mindful of rate limits and network efficiency.

For more advanced needs, consider APIs offering historical pricing, volume data, or exchange-specific quotes, and always respect each provider’s usage policy.

Practical Examples: Using Python and JavaScript to Fetch Bitcoin’s Price

Let’s look at how you might programmatically retrieve Bitcoin price data using Python and JavaScript. These examples use the free CoinGecko public endpoint, but principles are similar for other providers (including Token Metrics). Remember: Always insert your API key if required and consult the provider's documentation for up-to-date endpoints.

  • Python (using requests): 
    import requests
response = requests.get('https://api.coingecko.com/api/v3/simple/price?ids=bitcoin&vs_currencies=usd')
data = response.json()
print('Bitcoin price in USD:', data['bitcoin']['usd'])
  • JavaScript (using fetch in Node.js or browsers): 
    fetch('https://api.coingecko.com/api/v3/simple/price?ids=bitcoin&vs_currencies=usd')
  .then(res => res.json())
  .then(data => console.log('Bitcoin price in USD:', data.bitcoin.usd));

For APIs requiring an API key, you typically add it via a header or as part of the URL (e.g., ?apikey=YOUR_API_KEY). Always treat keys securely and avoid sharing them in public code repositories.

How to Choose the Right Public Crypto API for Bitcoin Price Retrieval

Not all crypto APIs are equal: coverage, latency, historical data availability, and advanced analytics vary widely. Here are key factors to evaluate:

  • Data Accuracy and Source: Does the API offer composite price averages or single-exchange quotes? Is data refreshed in real-time (every second), or is it delayed?
  • Coverage and Features: Does the provider offer price data for only Bitcoin, or thousands of crypto assets? Do they include historical time-series, market depth, or on-chain analytics?
  • Rate Limits and Reliability: Is the API robust at high request rates? Are there limits per minute or per day?
  • Security and Compliance: Are API keys managed securely? Does the provider have clear policies around data use?
  • Documentation and Community Support: Well-documented APIs save time and reduce integration risk.

For enterprise or analytics-focused use cases, APIs like Token Metrics add value through comprehensive data sets, trading signals, and AI-powered insights, enabling deeper quantitative or on-chain research workflows.

Leveraging AI and Real-Time Crypto Analytics for Bitcoin Price Data

Modern crypto research isn’t just about fetching a price—it’s about contextualizing that price within broader trends. AI and machine learning models, including those powering platforms like Token Metrics, ingest live price feeds, on-chain metrics, social sentiment, and more to provide actionable analytics and deeper market understanding.

For developers and researchers, integrating public crypto price APIs is often the first step in powering:

  • Automated Trading Bots that continually scan the market for opportunities.
  • Data Visualizations and Dashboards suited for both retail and institutional analysis.
  • Risk Engines that combine price with volatility metrics or blockchain activity.
  • AI Agents that require real-time price inputs to optimize predictions or portfolio models.

Choosing an API that delivers not only price, but also analytical data, can accelerate both research and application development.

Build Smarter Crypto Apps & AI Agents with Token Metrics

Token Metrics provides real-time prices, trading signals, and on-chain insights all from one powerful API. Grab a Free API Key

FAQs: Retrieving Bitcoin’s Current Price from Public APIs

What is a public crypto API?

A public crypto API is an interface provided by exchanges or data aggregators that allows users to access cryptocurrency data—such as price, volume, and other metrics—without requiring private access or fees. Some APIs may still require free registration for an API key.

Is public API Bitcoin price data real-time or delayed?

This depends on the provider. Leading APIs typically offer real-time or near real-time data (updated every second), but some aggregate or free APIs may introduce short delays. Always check the documentation for specifics on data freshness.

Are there rate limits for public crypto APIs?

Yes. Almost all public APIs have rate limits—typically restricting the number of requests per minute or per day. These are put in place to prevent abuse and ensure fair access for all users. Higher limits may be available with paid plans or API keys.

Can I use public Bitcoin price APIs for commercial projects?

This depends on the API’s terms of service. While many offer free public endpoints, commercial usage may be subject to tighter limits or require a paid plan. Always review the provider’s terms, especially for high-frequency or enterprise use.

How secure is it to use public crypto APIs?

Public APIs themselves are generally secure when accessed over HTTPS. However, always protect your API keys, follow provider best practices, and avoid exposing sensitive credentials in public code repositories or front-end codebases.

Disclaimer

This article is for informational purposes only. It does not constitute financial advice, recommendations, or endorsements. Always conduct independent research and comply with all applicable laws and API usage terms before integrating third-party data sources.

Research

Understanding APIs: What They Are and How They Work

Token Metrics Team
5
MIN

In the digital age, applications constantly interact with each other—whether it's your weather app pulling data from a meteorological server, or a crypto portfolio tracker fetching blockchain prices. The hidden force behind most of these interactions? APIs.

This blog post explores what an API is, how it works, and why APIs are so critical to modern software, including use in crypto and blockchain technologies.

What Is an API?

API stands for Application Programming Interface. It acts as a bridge that enables two separate software systems to communicate and share data. Much like a waiter taking your order and delivering food between you and the kitchen, an API relays requests and returns the appropriate responses.

Developers use APIs to simplify the building of software applications. Rather than writing code from scratch, APIs allow developers to pull in data, execute tasks, or access services provided by another app or platform.

How Does an API Work?

APIs operate through a series of requests and responses. The client (usually the application or user interface) sends a request to the server (which hosts the API). The API then handles this request, processes it based on pre-defined rules, and returns a response.

Here’s a simplified breakdown of the process:


     

     

     


Most modern APIs are RESTful (Representational State Transfer) and operate via HTTP protocols. These APIs are platform-agnostic and highly scalable, making them suitable for both web and mobile applications.

Why APIs Matter in Crypto

APIs are fundamental to the crypto ecosystem because they allow developers to:


     

     

     

     


Build Smarter Crypto Apps & AI Agents in Minutes, Not Months

Real-time prices, trading signals, and on-chain insights all from one powerful API. Grab a Free API Key

Types of APIs

APIs vary based on their purpose and accessibility. It's important to understand the distinctions when designing or integrating them.


     

     

     

     


In the crypto world, partner APIs are often provided by exchanges, while open APIs are commonly seen on market data aggregator platforms.

API Security and Governance

Given that APIs provide entry points into systems, security is a top priority. Common best practices include:


     

     

     

     


Enterprises also use API gateways and management layers to track usage, apply governance policies, and scale efficiently.

Real-World API Use Cases in Crypto

The crypto industry is teeming with API-driven applications. Here are a few impactful examples:


     

     

     

     


Whether for DeFi apps, on-chain research, or Web3 gaming—APIs provide the infrastructure for scaling innovation.

FAQs

What is a REST API?

A REST API (Representational State Transfer) is an architectural style that uses HTTP methods (GET, POST, PUT, DELETE) to facilitate communication between systems. It's known for being lightweight, stateless, and scalable.

How do crypto trading bots use APIs?

Trading bots use API integrations to access live market data, monitor trade signals, and execute trades automatically on exchanges based on pre-programmed logic.

Are APIs secure?

APIs can be secure if built with strong authentication, encryption, and rate limiting. However, poor implementation or public exposure without proper security layers can introduce vulnerabilities.

Can I build a crypto app using public APIs?

Yes. Many platforms like Token Metrics API offer public APIs to developers. These allow you to access real-time data and integrate core functionalities into your app.

What format do APIs return data in?

Most modern APIs return data in JSON format due to its readability and ease of use. Some also offer XML or CSV for legacy systems.

Disclaimer

This blog post is intended for educational purposes only. It does not constitute investment advice, trading guidance, or an endorsement of any financial instruments. Users should conduct their own due diligence and consult with professionals before making any financial decisions.

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Token Metrics Media LLC is a regular publication of information, analysis, and commentary focused especially on blockchain technology and business, cryptocurrency, blockchain-based tokens, market trends, and trading strategies.

Token Metrics Media LLC does not provide individually tailored investment advice and does not take a subscriber’s or anyone’s personal circumstances into consideration when discussing investments; nor is Token Metrics Advisers LLC registered as an investment adviser or broker-dealer in any jurisdiction.

Information contained herein is not an offer or solicitation to buy, hold, or sell any security. The Token Metrics team has advised and invested in many blockchain companies. A complete list of their advisory roles and current holdings can be viewed here: https://tokenmetrics.com/disclosures.html/

Token Metrics Media LLC relies on information from various sources believed to be reliable, including clients and third parties, but cannot guarantee the accuracy and completeness of that information. Additionally, Token Metrics Media LLC does not provide tax advice, and investors are encouraged to consult with their personal tax advisors.

All investing involves risk, including the possible loss of money you invest, and past performance does not guarantee future performance. Ratings and price predictions are provided for informational and illustrative purposes, and may not reflect actual future performance.

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