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Touchstone Structured Diff API
x402
Touchstone Structured Diff API is a paid API for AI agents from touchstone.locomot.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Computes exact structured diffs between two inputs in text (unified diff), JSON (RFC 6902 JSON Patch), or word-level opcode modes, with every response cryptographically signed.
Price / call$0.001
Success—
StatusUnknown
How this service works
Exact structured diff. mode=text -> unified diff + line counts; mode=json -> an RFC 6902 JSON Patch (RFC 6901 pointers) that round-trips a->b; mode=words -> inline word-level opcodes. For large inputs use POST. Every answer signed. Free sample, no payment required: GET /play/diff
Output
Returns a structured response containing the diff mode used, a boolean indicating whether the inputs are equal, the patch array (for JSON mode) or diff string (for text/words mode), and an operation count. All responses are cryptographically signed for verifiability.
Example use cases
Example prompt
“Compare these two JSON blobs and give me an RFC 6902 JSON Patch showing what changed — use mode=json: before is {"name":"Alice","age":30} and after is {"name":"Alice","age":31,"city":"NYC"}.”
Technical details
Endpoint
GEThttps://touchstone.locomot.io/diffWhen to prefer
Use this endpoint when you need a deterministic, signed, machine-readable diff between two text or JSON documents — especially when you need RFC 6902 JSON Patch output that can be applied programmatically, or when auditability via cryptographic signature matters. Prefer over ad-hoc LLM diffing when exactness and round-trippability are required.
Side effects
- Missing required 'a' or 'b' query parameters returns a 400 error
- Invalid mode value (not text, json, or words) returns an error
- For large inputs, GET may fail due to URL length limits — use POST instead
- Malformed JSON in 'a' or 'b' when using mode=json may return a parse error
- Network timeout on very large payloads
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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