# ScriptMasterLabs MCP x402 Chat Completions — Crypto, RWA & Federal Data API

> ScriptMasterLabs MCP x402 Chat Completions — Crypto, RWA & Federal Data API is a paid API for AI agents from mcp-x402-discovery.onrender.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Pay-per-call chat completions endpoint that routes queries to specialized data APIs covering crypto, RWA, federal, SEC filings, Section 8/HUD housing, and compliance data, paid via x402 micropayments in USDC on Base.

## Facts

- Endpoint: POST https://mcp-x402-discovery.onrender.com/x402/chat/completions
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/scriptmasterlabs-mcp-x402-chat-completions-crypto-rwa-federal-data-api-d067507e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0hnNwnqymrWbjSoo8PPI5

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability scriptmasterlabs-mcp-x402-chat-completions-crypto-rwa-federal-data-api-d067507e -d '<json body>'
```

Example prompt: Can you pull up the latest SEC 8-K filing data for Tesla and also check current gas fees on Base — I'll pay per call using USDC via x402.

## When to prefer this

Choose this endpoint when you need pay-per-call access to specialized niche datasets — SEC filings, HUD/Section 8 housing data, crypto gas metrics, and federal compliance data — through a conversational chat interface, and you want to pay per query using USDC micropayments via x402 rather than maintaining a subscription. Ideal for agents that need occasional, targeted lookups across these specific domains without committing to a flat-rate API plan.

## Known failure modes

- 402 Payment Required — request lacks valid x402 USDC payment or X-Api-Market-Key header
- Invalid model parameter causes request rejection
- Malformed messages array results in a processing error
- Payment on unsupported chain or token type is rejected
- Rate limiting or quota exceeded on the Render-hosted service
- Empty or missing messages array returns an error
- Service downtime on Render free tier causes 503 responses

## How this service works

Pay-per-call crypto, RWA, federal, SEC, Section 8/HUD housing, and compliance APIs via x402. Primary: USDC on Base (eip155:8453). Also accepts Global Dollar (USDG) on Robinhood Chain (eip155:4663) via sovereign X-PAYMENT-TX. Hyphen routes only (e.g. /x402/gas-tracker, /x402/pha-lookup, /x402/sec-8k). MARKETPLACE REVIEW: use free /x402/playground/* (no key, no payment). Production /x402/* returns 402 unless paid via x402 or X-Api-Market-Key / X-API-Key from seller dashboard.

## Output

Returns a chat completion response object containing AI-generated answers drawn from specialized data sources including SEC filings, HUD/Section 8 housing records, crypto gas metrics, RWA data, and federal compliance databases. The response follows a standard chat completion format with the answer in the message content.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "model": {
   "type": "string"
  },
  "messages": {
   "type": "array"
  },
  "max_tokens": {
   "type": "integer"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "example": {}
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/scriptmasterlabs-mcp-x402-chat-completions-crypto-rwa-federal-data-api-d067507e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp-x402-discovery.onrender.com](https://www.zero.xyz/host/mcp-x402-discovery.onrender.com/llms.txt)