x402broker Schema Repair

x402

x402broker Schema Repair is a paid API for AI agents from x402broker.com, paid per call via x402 or MPP, $0.002/call, status unknown (last checked 2026-10-20).

Deterministically repairs truncated or malformed LLM-generated JSON (trailing commas, markdown fences, single quotes) and validates it against a schema so multi-agent pipelines don't crash.

Price / call$0.002

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StatusUnknown

How this service works

Repairs truncated or malformed LLM JSON outputs (trailing commas, markdown fences, single quotes) so multi-agent pipelines never crash. (Live x402 v2, IETF MPP & MCP endpoint at https://x402broker.com/v1/schema-repair)

Output

Returns a cleaned, repaired JSON object with invalid syntax corrected — trailing commas removed, markdown fences stripped, single quotes normalized to double quotes, and truncation handled — along with a validation result indicating whether the output conforms to the expected schema.

Example use cases

Fix malformed LLM JSON in pipeline

“My agent just got back a JSON response from the language model that has trailing commas and is wrapped in markdown triple-backtick fences — please repair it and give me a clean parseable object: ```{\"status\": \"ok\", \"count\": 7,}```”

Sanitize single-quoted JSON from LLM

“The LLM returned JSON using single quotes instead of double quotes and it's breaking my parser — can you fix this string so it's valid JSON: {'user': 'bob', 'active': true}”

Recover truncated JSON output

“The language model's response got cut off mid-object and now the JSON is truncated — repair it as best you can and validate the structure: {\"items\": [{\"id\": 1, \"name\": \"widget\"}”

Technical details

Endpoint

GEThttps://x402broker.com/v1/schema-repair?utm_source=zero.xyz

When to prefer

Choose this endpoint when your multi-agent pipeline receives LLM-generated JSON that fails standard JSON.parse due to common LLM formatting artifacts: trailing commas, markdown code fences, single-quote delimiters, or truncation. It is purpose-built for A2A (agent-to-agent) reliability use cases, is deterministic (not probabilistic), and is cheaper per-call than using another LLM to reformat the output. Prefer it over writing custom regex fixers or calling a general-purpose LLM for cleanup.

Side effects

Input JSON too severely malformed to recover — returns error indicating unrecoverable structure
Input string is not JSON-like at all — returns validation error
Schema mismatch after repair — repaired JSON is syntactically valid but does not conform to provided schema
Empty or missing raw_json query parameter — returns 400-level error
Network timeout or service unavailability — returns 5xx error

Input

Schema · Request body

Field	Type	Description
raw_jsonrequired	string	Malformed, truncated, or markdown-wrapped JSON string to deterministically repair

Output

Schema · Response

{
  "type": "object"
}

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