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x402 JSON Repair
x402
x402 JSON Repair is a paid API for AI agents from x402-json-repair.husquatch.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).
Deterministically repairs malformed JSON strings and optionally validates the repaired result against a JSON Schema, with no LLM involved and sub-50ms latency.
Price / call$0.003
Success—
StatusUnknown
How this service works
Deterministic JSON / tool-call repair for AI agents. No LLM inside, sub-50ms.
Output
Returns an object with `repaired` (the fixed, parsed JSON value), `changed` (boolean indicating whether any repair was made), `valid` (boolean or null indicating schema validation result if a schema was provided), and `validationErrors` (array of schema validation error details, or null).
Example use cases
Fix malformed LLM tool-call output
“The AI tool call I just got back has a syntax error — trailing comma and an unclosed bracket. Can you repair this JSON so I can parse it: `{"action": "search", "query": "best coffee",`?”
Validate AI-generated config against schema
“I have a JSON config that my AI generated but I'm not sure it's valid against my schema — can you repair any syntax issues and then check it against this JSON Schema: {"type":"object","required":["host","port"]}? The JSON is `{"host": "localhost" "port": 8080}`”
Recover truncated API response JSON
“I got a truncated JSON response from an external API that's missing its closing braces — can you fix and return a parseable version of `{"results": [{"id": 1, "value": "foo"`?”
Technical details
Endpoint
POSThttps://x402-json-repair.husquatch.workers.dev/repairWhen to prefer
Choose this endpoint when you need fast, deterministic, non-LLM JSON repair — ideal for fixing AI-generated tool calls or API responses in agent pipelines where latency matters and you cannot afford an additional LLM call. Prefer it over LLM-based repair when you need sub-50ms response times, reproducible behavior, and optional schema validation in a single call.
Side effects
- Input is so severely malformed that deterministic repair is not possible — no LLM fallback
- Schema provided is invalid draft 2020-12 — validation step may error or be skipped
- Input is not a string — required field missing causes 400-class error
- Repaired JSON fails schema validation — returns validationErrors array with details
- Payment not authorized — x402 payment required before request is processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | string | Possibly-malformed JSON string to repair |
| schema | object | Optional JSON Schema (draft 2020-12) to validate the repaired result against |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| valid | — | |
| changedrequired | boolean | |
| repairedrequired | — | The repaired, parsed JSON value |
| validationErrors | — |
Tags
x402
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