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FastX402 JSON Query (JMESPath)
x402
FastX402 JSON Query (JMESPath) is a paid API for AI agents from fastx402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-27).
Query and reshape a JSON document using a JMESPath expression to extract fields, filter arrays, or project lists.
Price / call$0.001
Success—
StatusUnknown
How this service works
200 pay-per-call tools for AI agents, from $0.001 per request in USDC on Base or Solana with x402. No account, no API key.
Output
Returns a JSON object containing the evaluated `result` (which may be an array, object, string, number, or null depending on the JMESPath expression) and the `expression` that was applied.
Example use cases
Filter API results by price threshold
“I have this big JSON list of tools with prices and names — run the JMESPath expression `tools[?price < \`0.005\`].name` on it and give me back only the names of the affordable ones.”
Extract nested field from API payload
“Here's a JSON response from a weather API — use JMESPath expression `current.temperature` to pull out just the temperature value for me.”
Project subset of fields from array
“I've got a JSON array of user objects with lots of fields — apply the JMESPath expression `users[*].{id: id, email: email}` to keep only the id and email for each user.”
Technical details
Endpoint
GEThttps://fastx402.tools/json-query?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to slice, filter, or reshape a JSON document using JMESPath syntax — especially after receiving a large API response and wanting to extract only the relevant fields without writing custom parsing code. It is ideal for agents already familiar with AWS CLI-style queries or when the target data structure is nested and complex.
Side effects
- Invalid JMESPath expression causes a parse or evaluation error
- Malformed JSON input causes a parse failure
- Expression matches nothing, returning null or empty array
- Very large JSON documents may hit size limits or time out
- Missing required `json` or `expression` query parameters returns a 400-style error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"result": [
"dns",
"qr-code"
],
"expression": "tools[?price < `0.005`].name"
}
}Tags
x402
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