Http Status

{
  "asOf": "2026-10-11T14:26:46.381Z",
  "cacheableByDefault": false,
  "class": "Client Error",
  "classDigit": 4,
  "clientAction": "Slow down; honour Retry-After; use exponential backoff.",
  "code": 429,
  "degraded": false,
  "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
  "meaning": "Too Many Requests: you hit a rate limit.",
  "name": "Too Many Requests",
  "notChecked": [
    "status codes defined by private extensions or proxies (a few common ones are flagged as unregistered)",
    "the exact wording of the RFC (summaries only; follow the reference for normative text)",
    "…1 more"
  ],
  "reasons": [
    "Typical cause: Too many calls in a time window.",
    "Client action: Slow down; honour Retry-After; use exponential backoff."
  ],
  "reference": "[RFC6585]",
  "registered": true,
  "registryNote": null,
  "retryHint": "retry later, honour Retry-After",
  "source": "IANA HTTP Status Code Registry (retrieved 2026-10-11) and RFC 9110; explanations written for this shelf",
  "summary": "429 Too Many Requests. Too Many Requests: you hit a rate limit.",
  "typicalCause": "Too many calls in a time window.",
  "vendor": null,
  "verdict": "REGISTERED"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://dev-reference.x402tookit.com/http-status?code=429'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://dev-reference.x402tookit.com/http-status?code=429' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fdev-reference.x402tookit.com%2Fhttp-status
const res = await pay("https://dev-reference.x402tookit.com/http-status?code=429");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://dev-reference.x402tookit.com/http-status?code=429")
    print(res.status_code, res.text)