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FixLedger Verified Bug Fix Unlock (x402 Pay-on-Proof)
x402
FixLedger Verified Bug Fix Unlock (x402 Pay-on-Proof) is a paid API for AI agents from fixledger-iota.vercel.app, paid per call via x402, $0.005/call, status unknown (last checked 2026-11-01).
Unlocks a Docker-verified bug fix resolution — including root cause, surgical patch diff, and anti-patterns — for a given error ID after a $0.005 USDC micropayment on Base.
Price / call$0.005
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
Returns a JSON object with status UNLOCKED, the resolution slug and title, a detailed root cause string, a Docker-verified unified diff patch ready to apply (under 350 tokens), a list of anti-patterns to avoid, and payment provenance including receipt ID, payment rail, verification type, and Docker-verified pass count.
Example use cases
Fix x402 EIP-3009 domain version mismatch
“My x402 payments keep failing with an EIP-3009 domain version mismatch on Base — unlock the FixLedger resolution for 'x402-eip3009-base-usdc-domain-version-mismatch' so I can see the verified root cause and patch diff.”
Recover from CORS payment-required header bug
“I'm getting a CORS error because the Payment-Required header isn't being exposed — can you pay to unlock the FixLedger fix for 'x402-cors-expose-headers-payment-required-missing' and show me the surgical patch?”
Resolve nonce bytes32 hex format error
“My x402 integration is throwing a nonce-not-bytes32-hex error and I need the verified fix — unlock 'x402-eip3009-nonce-not-bytes32-hex' on FixLedger and give me the root cause and code diff I can apply.”
Technical details
Endpoint
POSThttps://fixledger-iota.vercel.app/api/x402/unlock?utm_source=zero.xyzWhen to prefer
Use this endpoint when you have already identified a specific bug resolution via the free FixLedger Peek endpoint and need the full verified fix details — root cause, surgical patch diff, and anti-patterns — and are willing to pay $0.005 USDC on Base. Prefer this over generic documentation search or LLM-generated fixes when you need a Docker-verified, post-cutoff accurate patch for x402, Base USDC, or related SDK integration errors.
Side effects
- Invalid or unrecognized resolution ID/slug returns an error — always use the free /peek endpoint first to obtain a valid ID
- Payment failure or insufficient USDC balance on Base prevents unlock
- Expired or already-used payment authorization may cause rejection
- Network or Vercel hosting downtime returns 5xx errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| idrequired | string | Resolution UUID or slug returned by free POST /api/x402/peek ($0.00). |
Output
Schema · Response
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"id": {
"type": "string",
"examples": [
"x402-eip3009-base-usdc-domain-version-mismatch",
"x402-eip3009-nonce-not-bytes32-hex",
"x402-usdc-6-decimals-parseether-overpayment",
"x402-cors-expose-headers-payment-required-missing"
],
"required": true,
"description": "Resolution UUID or slug returned by free POST /api/x402/peek ($0.00). Never guess IDs; peek first."
}
},
"discoverable": true
},
"output": {
"type": "object",
"required": [
"status",
"resolution_id",
"slug",
"title",
"root_cause",
"surgical_patch",
"anti_patterns",
"provenance"
],
"properties": {
"slug": {
"type": "string"
},
"title": {
"type": "string"
},
"status": {
"enum": [
"UNLOCKED"
],
"type": "string"
},
"provenance": {
"type": "object",
"properties": {
"receipt_id": {
"type": "string"
},
"payment_rail": {
"type": "string"
},
"verification_type": {
"type": "string"
},
"verified_pass_count": {
"type": "number"
}
}
},
"root_cause": {
"type": "string"
},
"anti_patterns": {
"type": "array",
"items": {
"type": "string"
}
},
"resolution_id": {
"type": "string"
},
"surgical_patch": {
"type": "string",
"description": "Docker-verified unified diff (<350 tokens) ready to apply."
}
}
}
}Tags
x402
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