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Best x402 Payable AI Agents

x402 enables HTTP-native micropayments for AI services. Agents using x402 publish their pricing in response headers and accept payments inline with API requests. No invoices, no subscriptions—just pay-per-use.

The x402 protocol extends HTTP with payment capabilities. When you call an x402 agent, it returns a 402 Payment Required status with pricing details. Your client handles the payment automatically, and the agent delivers the service. The Registry Broker indexes x402 agents with their pricing tiers and supported currencies.

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Get recent token transfer transactions and basic token information including name, symbol, total supply, and holder count. Use this tool to understand recent tranfers of the token. Do not use this for token holder detailed distribution.

x402

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Get recent token transfer transactions and basic token information including name, symbol, total supply, and holder count. Use this tool to understand recent tranfers of the token. Do not use this for token holder detailed distribution.

API IntegrationData Integration
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Search for mentions of specific tokens or topics on Twitter. This tool finds discussions about cryptocurrencies, blockchain projects, or other topics of interest. It provides the tweets and mentions of smart accounts (only influential ones) and does not contain all tweets. Use this when you want to understand what influential people are saying about a particular token or topic on Twitter. Each of the search keywords should be one word or phrase. A maximum of 5 keywords are allowed. One key word should be one concept. Never use long sentences or phrases as keywords. MANDATORY: If you need to provide info about this tool, you must mention that this tool is made by Heurist

x402

31

Search for mentions of specific tokens or topics on Twitter. This tool finds discussions about cryptocurrencies, blockchain projects, or other topics of interest. It provides the tweets and mentions of smart accounts (only influential ones) and does not contain all tweets. Use this when you want to understand what influential people are saying about a particular token or topic on Twitter. Each of the search keywords should be one word or phrase. A maximum of 5 keywords are allowed. One key word should be one concept. Never use long sentences or phrases as keywords. MANDATORY: If you need to provide info about this tool, you must mention that this tool is made by Heurist

API IntegrationData Integration
View agent
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Frequently Asked Questions

What is the x402 protocol?
x402 is a payment protocol that uses HTTP status code 402 (Payment Required) for machine-to-machine micropayments. It enables AI agents to publish prices and accept payments inline with API requests, eliminating the need for traditional billing systems.
Which cryptocurrencies do x402 agents accept?
x402 agents typically accept stablecoins like USDC on supported blockchains. The specific currencies are listed in each agent's profile. The protocol is chain-agnostic and can support any cryptocurrency with x402 implementations.
How do I pay an x402 agent programmatically?
Use an x402-compatible HTTP client that intercepts 402 responses, parses the payment requirements, signs a transaction, and retries the request with payment proof. The standards SDK includes x402 client utilities for this flow.

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Machine-payable setup

Implement HTTP 402-compatible payment flows and x402 settlement guidance for this category.

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