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FixLedger Post-Cutoff SDK Delta Oracle
x402
FixLedger Post-Cutoff SDK Delta Oracle is a paid API for AI agents from fixledger-iota.vercel.app, paid per call via x402, $0.003/call, status unknown (last checked 2026-11-01).
Returns a structured migration spec or active model/pricing matrix for a specified post-cutoff topic key, unlocked via micropayment.
Price / call$0.003
Success—
StatusUnknown
How this service works
Machine-payable MCP and x402 registry of Docker-verified bug fixes and post-cutoff SDK deltas. Free <50ms Peek-Before-Pay check; $0.005 Pay-on-Proof unlock on Base USDC.
Output
A structured JSON object with status UNLOCKED, the topic key, category, a dense migration spec or model/pricing matrix as the 'delta' field, an optional source URL, and an updated_at timestamp indicating when the data was last refreshed.
Example use cases
Next.js v15 async migration guide
“I'm upgrading a Next.js app from v14 to v15 — can you fetch the verified migration spec for 'nextjs:v14-to-v15-async-apis' so I know all the breaking async API changes I need to fix?”
Active 2026 LLM model pricing matrix
“What are the currently active LLM models and their pricing in 2026? Pull the 'llm-models:active-2026' delta from FixLedger so I have an up-to-date matrix to work from.”
Google GenAI SDK unification changes
“I need to migrate from the legacy Google GenAI SDK to the new unified one — can you get me the structured delta for 'google-genai:legacy-to-unified-sdk' with all the specific changes I need to make?”
Technical details
Endpoint
POSThttps://fixledger-iota.vercel.app/api/x402/delta?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs post-training-cutoff SDK migration specs, breaking change summaries, or current LLM model matrices that are not in its training data. Prefer it over general web search when you need structured, machine-readable JSON deltas verified against Docker environments rather than prose documentation. Best suited for agents automating code migrations or needing authoritative, timestamped change data for specific enumerated topic keys.
Side effects
- Invalid or unrecognized topic key returns an error or empty result
- Payment not completed or insufficient USDC balance blocks unlock
- Topic key not yet in catalog returns no delta
- Network or Vercel deployment downtime causes request failure
- Malformed POST body missing required 'topic' field returns 400-level error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| topicrequired | string | Topic key (e.g. 'llm-models:active-2026', 'x402:eip3009-base-spec'). |
Output
Schema · Response
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"topic": {
"enum": [
"llm-models:active-2026",
"x402:eip3009-base-spec",
"tailwindcss:v3-to-v4",
"mcp:sse-to-streamable-http",
"nextjs:v14-to-v15-async-apis",
"google-genai:legacy-to-unified-sdk"
],
"type": "string",
"examples": [
"llm-models:active-2026",
"x402:eip3009-base-spec"
],
"required": true,
"description": "Post-cutoff SDK migration or active 2026 LLM model matrix key. Omit ?topic for free $0.00 catalog listing."
}
},
"discoverable": true
},
"output": {
"type": "object",
"required": [
"status",
"topic_key",
"category",
"delta",
"updated_at"
],
"properties": {
"delta": {
"type": "object",
"description": "Dense structured JSON migration spec or active model/pricing matrix."
},
"status": {
"enum": [
"UNLOCKED"
],
"type": "string"
},
"category": {
"type": "string"
},
"topic_key": {
"type": "string"
},
"source_url": {
"type": "string"
},
"updated_at": {
"type": "string"
}
}
}
}Tags
x402
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