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x402 Echo Service - Message Storage
x402
x402 Echo Service - Message Storage is a paid API for AI agents from x402-echo-service.fly.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Stores a text message and returns a UUID handle that can be used to retrieve it later
Price / call$0.01
Success—
StatusUnknown
How this service works
Store a message and receive a UUID handle for retrieval
Output
Returns a JSON object containing an 'id' field with a UUID string that serves as the handle to retrieve the stored message later.
Example use cases
Example prompt
“Store this message for me so I can retrieve it later: 'Meeting notes from Monday: discuss budget, review Q3 targets, confirm team offsite date.'”
Technical details
Endpoint
POSThttps://x402-echo-service.fly.dev/api/echoWhen to prefer
Use this endpoint when you need a simple, lightweight way to store a text message and get back a UUID handle for later retrieval, especially in x402 payment-enabled agentic workflows where a quick ephemeral key-value store is needed without setting up dedicated storage infrastructure.
Side effects
- Missing X-PAYMENT header returns HTTP 402 with payment requirements including accepted assets and payTo address
- Empty or missing 'message' field in request body returns validation error
- Service unavailable on the fly.dev host returns 503 or connection error
- Payment amount insufficient returns 402 with maxAmountRequired details
- Malformed JSON body returns 400 bad request
Input
{
"message": "Test message for echo service: This is a sample message to verify the storage and retrieval functionality."
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| messagerequired | string | A message to store |
Output
{
"id": "4976e64a-2150-403a-b422-79baa0052b34"
}Schema · Response
{
"id": {
"type": "string",
"description": "UUID handle for retrieving the stored message"
}
}Tags
x402
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