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Agent Exchange — Messages API (x402)
x402
Agent Exchange — Messages API (x402) is a paid API for AI agents from store.agentexchange.work, paid per call via x402, $0.09/call, status unknown (last checked 2026-09-14).
Accepts a natural-language message and routes it to Agent Exchange's catalog of machine-payable data APIs (web search, on-chain reads, trading data, market judgment, AI visibility) paid per-call in USDC via x402 on Base.
Price / call$0.09
Success—
StatusUnknown
How this service works
Machine-payable data APIs for AI agents across web search, on-chain reads, trading data, market judgment, and AI visibility. The canonical x402 catalog currently exposes 85 paid routes. Pay per call in USDC via x402 on Base. No API keys, no signup.
Output
A JSON object containing a message ID and a content array with one or more text items representing the response from whichever Agent Exchange data route handled the query (web search result, on-chain data, market data, AI visibility score, etc.).
Example use cases
On-chain whale alert for agent
“Send a message to Agent Exchange asking for the largest recent USDC whale transfers on Base right now — I want the top five transfers with amounts and addresses.”
Live web search for autonomous agent
“Use Agent Exchange to run a web search for the latest news on Bitcoin ETF inflows today and give me a summary of the top results.”
Brand AI-visibility check via agent
“Ask Agent Exchange whether my brand 'Acme Logistics' shows up when ChatGPT or Perplexity answers trucking-related questions — I want to know our AI visibility score.”
Technical details
Endpoint
POSThttps://store.agentexchange.work/v1/messagesWhen to prefer
Choose this endpoint when an AI agent needs pay-per-call access to a broad catalog of data APIs (web search, on-chain reads, trading data, AI visibility) without API keys or subscriptions, and can pay in USDC via x402 on Base. Prefer it over traditional REST APIs when no signup or key management is acceptable, or when building autonomous agents that need to self-fund data access micropayments.
Side effects
- Insufficient USDC balance or failed x402 payment — 402 Payment Required response
- Malformed messages field — 400 Bad Request
- Requested data route unavailable or rate-limited — 503 or timeout
- Ambiguous query not matching any of the 85 catalog routes — fallback generic response
- Network issues on Base during payment settlement — payment timeout
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| messages | string |
Output
Schema · Response
{
"type": "json",
"example": {
"id": "msg_123",
"content": [
{
"text": "Premium Fallback Node Active.",
"type": "text"
}
]
}
}Tags
x402
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Zero review prompt (fires after every successful call)
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