SelfHeal

Self-healing API proxy for AI agents. Pay per fix, not per month.

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Your agent hits a 422. It has no idea why. It retries the same broken payload five times, burns through your token budget, and crashes.

SelfHeal is an API proxy that intercepts failed requests, analyzes them with an LLM, and returns structured fix instructions — charging only when the fix succeeds via x402 micropayments (USDC on Base). Successful calls pass through free.

How It Works

Agent → POST /api/x402/proxy → Forward to target API
  ↓ Success (2xx)                    ↓ Failure (4xx/5xx)
  → Free pass-through ($0)          → Return 402 with x402 payment spec
                                     → Agent pays $0.001-$0.005 USDC
                                     → LLM analyzes error
                                     → Structured fix returned
                                     → Payment settled only if heal succeeds

No API keys. No signup. No subscriptions.

Quick Start

x402 Mode (recommended — no API key needed)

# Successful request — free pass-through
curl -X POST https://selfheal.dev/api/x402/proxy \
  -H "Content-Type: application/json" \
  -d '{"url": "https://api.example.com/users", "method": "GET"}'

# Failed request — returns 402 with payment spec
curl -X POST https://selfheal.dev/api/x402/proxy \
  -H "Content-Type: application/json" \
  -d '{"url": "https://api.openai.com/v1/chat/completions", "method": "POST", "body": "{\"model\":\"gpt-4o-mini\"}"}'

Python SDK

from graceful_fail import GracefulFail

gf = GracefulFail()  # No API key needed (x402 mode)
response = gf.post("https://api.example.com/users", json={"name": "Alice"})

if response.healed:
    print(response.error_analysis.actionable_fix_for_agent)
elif response.payment_required:
    print("Payment needed:", response.payment_required)
else:
    print("Success:", response.data)

Node.js / TypeScript

import { GracefulFail } from "graceful-fail";

const gf = new GracefulFail({
  onPaymentRequired: async (spec) => {
    // Your x402 payment logic here
    return paymentProof;
  },
});

const resp = await gf.post("https://api.example.com/users", {
  json: { name: "Alice" },
});

if (resp.healed) {
  console.log(resp.errorAnalysis!.actionable_fix_for_agent);
}

Legacy Mode (API key)

# Still works — backward compatible
gf = GracefulFail(api_key="gf_your_key")
resp = gf.post(url, json=payload)

What a Healed Response Looks Like

{
  "healed": true,
  "settled": true,
  "transaction": "0xbf023f9c...",
  "original_status_code": 401,
  "error_analysis": {
    "is_retriable": false,
    "human_readable_explanation": "No API key was provided in the Authorization header.",
    "actionable_fix_for_agent": "Add Authorization header with your OpenAI API key.",
    "suggested_payload_diff": {
      "remove": [],
      "add": {},
      "modify": {}
    },
    "error_category": "auth"
  },
  "meta": {
    "tier": "complex",
    "cost_usdc": 0.003,
    "latency_ms": 3038
  }
}

Pricing

Scenario	Cost	When
Success (2xx/3xx)	$0	Always free
Simple error (400, 404, 422)	$0.001 USDC	Only on successful heal
Moderate error (500, 502, 503)	$0.002 USDC	Only on successful heal
Complex error (429, 403, auth)	$0.003-$0.005 USDC	Only on successful heal
Failed analysis	$0	Never charged

Payments via x402 protocol — USDC on Base. Gasless for payers (EIP-3009).

Endpoints

Method	Path	Description
POST	/api/x402/proxy	Proxy request with x402 payment on failure
POST	/api/x402/heal	Direct error analysis
GET	/api/x402/pricing	Current pricing tiers
GET	/api/x402/usage	Usage statistics
GET	/metrics	Prometheus metrics
GET	/health	Health check
POST	/api/proxy	Legacy proxy (API key auth)

SDKs

SDK	Install	Version
Python	pip install graceful-fail	0.4.0
Python + LangChain	pip install 'graceful-fail[langchain]'	0.4.0
Node.js / TypeScript	npm install graceful-fail	0.4.0

Both SDKs support x402 mode (default) and legacy API key mode. LangChain and CrewAI integrations included.

Features

• Outcome-based pricing — pay only when fixes succeed, via x402 micropayments
• Zero-overhead pass-through — 2xx/3xx returned verbatim, $0 cost
• LLM-powered analysis — structured JSON with fix instructions, payload diffs, error categories
• Provider-aware — specialized handling for OpenAI, Anthropic, Google, Cohere, Mistral errors
• Credential stripping — auth headers and API keys never reach the LLM
• Prometheus metrics — proxy requests, heals, latency, x402 payments, LLM token usage
• Webhook alerting — traffic spikes, LLM cost overruns, low heal success rates
• Response caching — TTL cache for successful GET requests
• Dashboard — API key management, request logs, usage analytics
• OpenAPI 3.1 spec — import into Postman or any OpenAPI client

Self-Hosting

git clone https://github.com/carsonlabs/graceful-fail.git
cd graceful-fail
npm install
cp .env.example .env    # configure database, LLM keys, x402 wallet
npm run db:push          # run database migrations
npm run dev              # start development server

Key environment variables for x402:

X402_RECEIVING_WALLET=0xYourWalletAddress
X402_NETWORKS=base-sepolia          # or "base" for mainnet
X402_TESTNET=true
ANTHROPIC_API_KEY=sk-ant-...        # for LLM error analysis

See .env.example for the full list.

Links

• Website
• Documentation
• Pricing
• npm
• PyPI
• Changelog
• Status

Built by Freedom Engineers.

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MIT License