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SKILL.md
Apollo Common Errors
Overview
Comprehensive guide to diagnosing and fixing Apollo.io API errors. Apollo uses x-api-key header authentication and the base URL https://api.apollo.io/api/v1/. Apollo distinguishes between master and standard API keys — many endpoints require master keys.
Prerequisites
Valid Apollo.io API credentials
Node.js 18+ or Python 3.10+
Instructions
Step 1: Identify the Error Category
// src/apollo/error-handler.ts
import { AxiosError } from 'axios';
type ErrorCategory = 'auth' | 'permission' | 'rate_limit' | 'validation' | 'server' | 'network';
function categorizeError(err: AxiosError): ErrorCategory {
if (!err.response) return 'network';
switch (err.response.status) {
case 401: return 'auth';
case 403: return 'permission';
case 429: return 'rate_limit';
case 400: case 422: return 'validation';
default: return err.response.status >= 500 ? 'server' : 'validation';
}
}
Step 2: Handle 401 — Invalid API Key
// Most common cause: missing x-api-key header or wrong key format
async function diagnoseAuth() {
try {
const response = await fetch('https://api.apollo.io/api/v1/auth/health', {
headers: { 'x-api-key': process.env.APOLLO_API_KEY! },
});
const data = await response.json();
if (data.is_logged_in) {
console.log('API key is valid');
} else {
console.error('API key is invalid or expired');
console.error(' Generate a new one at: Apollo > Settings > Integrations > API Keys');
}
} catch (err: any) {
console.error('Cannot reach Apollo API:', err.message);
}
}
Common 401 causes:
Using api_key query parameter instead of x-api-key header
Key was revoked or regenerated in the dashboard
Key has trailing whitespace (check with echo -n "$APOLLO_API_KEY" | wc -c)
Step 3: Handle 403 — Wrong Key Type
Standard API key: search + enrichment only
Master API key: full access (contacts, sequences, deals, tasks)
Endpoints that require a master key:
POST /contacts (create/update)
POST /emailer_campaigns/search (sequences)
POST /emailer_campaigns/{id}/add_contact_ids
POST /opportunities (deals)
POST /tasks (tasks)
DELETE /contacts/{id}
// Diagnose: test a master-key-only endpoint
async function diagnoseMasterKey() {
try {
await client.post('/contacts/search', { per_page: 1 });
console.log('Master API key confirmed');
} catch (err: any) {
if (err.response?.status === 403) {
console.error('Your API key is a standard key. Master key required.');
console.error(' Go to Apollo > Settings > Integrations > API Keys');
console.error(' Generate a new key with "Master Key" type');
}
}
}
Step 4: Handle 429 — Rate Limiting
Apollo uses fixed-window rate limiting per endpoint category:
Endpoint Category | Limit | Window | Burst
--------------------------+------------+---------+------
People Search | 100/min | 1 min | 10/sec
People Enrichment | 100/min | 1 min | 10/sec
Bulk People Enrichment | 10/min | 1 min | 2/sec
Organization Enrichment | 100/min | 1 min | 10/sec
Contacts (CRUD) | 100/min | 1 min | 10/sec
Sequences | 100/min | 1 min | 10/sec