Decode FastAPI 422 errors - loc/type payloads for body, query, header, HTTPExcep...
https://saylorinnovations.com/api/kb/fastapi-422-validation-errors-async-def-blocking-dependenciesOverview
Decode FastAPI 422 errors - loc/type payloads for body, query, header, HTTPException 401/404, async def time.sleep blocking measured
Protocol
x402
Price
$0.01
Payment Asset
USD Coin
Payment Network
eip155:8453
Category
uncategorized
Provider
Saylor Innovations Guide Library
Source
bazaar
Indexed
2026-10-20 13:23:18
Health
Status
healthy
Latency (p50)
283ms
Uptime (30d)
100.0%
Reliability Score
95/100
Last Checked
2026-10-28 16:17:03
Last Healthy
2026-10-28 16:17:03
Consecutive Failures
0
x402 Payment Validation
Payment Requirements
Valid
Asset Verified
Known USDC
Facilitator
—
Input Schema
{
"method": "GET",
"type": "http"
}
Output Schema
{
"example": {
"body": "Tested with FastAPI 0.151 and Pydantic 2.14: exact 422 payloads for missing fields, wrong types, bad JSON and form data, query limits, required headers, HTTPException, trailing-slash redirects, 405, 500 and a measured async def blocking test.",
"c": "Self-Hosting & Infra",
"id": "fastapi-422-validation-errors-async-def-blocking-dependencies",
"t": "FastAPI Errors Explained: 422 Validation Responses, Header and Query Rules, 500s and async def Blocking"
},
"type": "json"
}
Recent Health Checks
| Time | Status | HTTP | Latency | Error |
|---|---|---|---|---|
| 2026-10-28 16:17:03 | healthy | 402 | 250ms | |
| 2026-10-28 15:24:16 | healthy | 402 | 220ms | |
| 2026-10-28 14:18:41 | healthy | 402 | 552ms | |
| 2026-10-28 07:00:51 | healthy | 402 | 323ms | |
| 2026-10-28 05:38:44 | healthy | 402 | 236ms | |
| 2026-10-28 04:40:56 | healthy | 402 | 210ms | |
| 2026-10-28 03:47:00 | healthy | 402 | 380ms | |
| 2026-10-28 02:47:17 | healthy | 402 | 855ms | |
| 2026-10-28 01:43:01 | healthy | 402 | 271ms | |
| 2026-10-28 00:36:30 | healthy | 402 | 244ms | |
| 2026-10-27 23:40:28 | healthy | 402 | 283ms | |
| 2026-10-27 22:54:24 | healthy | 402 | 338ms | |
| 2026-10-27 21:43:41 | healthy | 402 | 745ms | |
| 2026-10-27 20:28:35 | healthy | 402 | 280ms | |
| 2026-10-27 19:23:15 | healthy | 402 | 311ms | |
| 2026-10-26 09:16:34 | healthy | 402 | 242ms | |
| 2026-10-25 20:09:52 | healthy | 402 | 951ms |