Phone Spam Check API

Phone Spam Check

Reported-caller complaints for a phone number from public FTC Do Not Call and FCC consumer complaint data: how many reports, when, and what kind of calls were reported.

Get API key Read the docs

POST/v1/phone-spam

1curl -X POST https://YOUR_API_HOST/v1/phone-spam \
2  -H "Authorization: Bearer $LOOKVALID_API_KEY" \
3  -H "Content-Type: application/json" \
4  -d '{"phone":"+12025550143"}'

Read docs

POST/v1/phone-spam

1const response = await fetch("https://YOUR_API_HOST/v1/phone-spam", {
2  method: "POST",
3  headers: {
4    Authorization: `Bearer ${process.env.LOOKVALID_API_KEY}`,
5    "Content-Type": "application/json",
6  },
7  body: JSON.stringify({
8    "phone": "+12025550143"
9  }),
10});
11const result = await response.json();
12console.log(result.found, result.data);

Read docs

POST/v1/phone-spam

1import os
2import requests
3
4response = requests.post(
5    "https://YOUR_API_HOST/v1/phone-spam",
6    headers={"Authorization": f"Bearer {os.environ['LOOKVALID_API_KEY']}"},
7    json={
8        "phone": "+12025550143"
9    },
10)
11result = response.json()
12print(result["found"], result["data"])

Read docs

200Captured example, 2026-10-18

1{
2  "product": "phone-spam",
3  "found": true,
4  "data": {
5    "phone_e164": "+12025550143",
6    "complaints_total": 2,
7    "first_reported": "2017-03-23",
8    "last_reported": "2017-03-23",
9    "issue_types": [
10      "prerecorded voice",
11      "unwanted calls"
12    ],
13    "sources_used": [
14      {
15        "id": "fcc",
16        "name": "FCC Consumer Complaints (opendata.fcc.gov, public domain)",
17        "complaints": 2,
18        "dataset_built_at": "2026-10-17T20:41:34.966Z"
19      }
20    ],
21    "spam_score": 32,
22    "risk_level": "medium",
23    "score_basis": {
24      "components": {
25        "volume": 11.9,
26        "recency": 0,
27        "issue_type": 20
28      },
29      "formula": "spam_score = round(volume + recency + issue_type). volume = 50 * min(1, log10(1 + complaints) / log10(101)). recency = 30 * 0.5^(age_days / 90) where age_days is the age of the newest complaint. issue_type = 20 * weight of the most serious reported issue (1.0 scam, fraud, robocall, prerecorded, spoofing or impersonation; 0.6 telemarketing, sales or other unwanted contact; 0.3 anything else)."
30    },
31    "disclaimer": "Complaints are unverified consumer reports and phone numbers can be spoofed, so a score describes how often a number was reported, not who is calling."
32  },
33  "sources": [
34    "FCC consumer complaints, public domain (opendata.fcc.gov)"
35  ]
36}

A real run of this lookup on 2026-10-18, using a public input. The envelope fields are left out.Read docs

1 credit per number with complaints on record
Charged only when it finds something
Cached 7 days

1 credit per number with complaints on record

Charged only when it finds something. A repeat inside 7 days is free.

Every LookValid product draws on one shared balance. See pricing.

From key to answer in three steps

One key, one POST to /v1/phone-spam and a JSON answer back. The same three steps work in any language that can send HTTPS.

01
Create a key
Sign up and copy a key from the dashboard. The same key works for every LookValid product and for the MCP server.
Terminal
```
export LOOKVALID_API_KEY="lv_live_..."
```

Send the request

POST a JSON body to /v1/phone-spam. 1 credit per number with complaints on record.

request.sh

1curl -X POST https://YOUR_API_HOST/v1/phone-spam \
2  -H "Authorization: Bearer $LOOKVALID_API_KEY" \
3  -H "Content-Type: application/json" \
4  -d '{"phone":"+12025550143"}'

Read the answer

A real run of this lookup on 2026-10-18. The data object has 10 named fields.

response.json

1{
2  "product": "phone-spam",
3  "found": true,
4  "data": {
5    "phone_e164": "+12025550143",
6    "complaints_total": 2,
7    "first_reported": "2017-03-23",
8    "last_reported": "2017-03-23",
9    "issue_types": [
10      "prerecorded voice",
11      "unwanted calls"
12    ],
13    "sources_used": [
14      {
15        "id": "fcc",
16  ...

A structured answer, not a page of text

The data object has 10 named fields. Every response also lists the sources behind the result, the credits charged and whether it was served from your cache.

Fields returned in data by Phone Spam Check
Field Type
phone_e164 string
complaints_total integer
first_reported string or null
last_reported string or null
issue_types array of string
And 5 more fields in the API reference.
Named fields. Complaints are unverified consumer reports, not a verdict about the caller.
1. Your requestone API key
2. Your cache7 daysRepeat: 0 credits
3. Data sourcefirst lookupFound: 1 credit
4. ResultJSON
A repeat lookup is free. Results are cached per account for 7 days. Ask the same question again inside that window and the response comes back with cache_hit: true and no charge.
Terminal
```
# Sent with every request, for every product
Authorization: Bearer $LOOKVALID_API_KEY
```
One key for your code and your agents. Send your API key as a Bearer token. The same key and the same credit balance cover every other LookValid product. AI agents can call it as a tool on the MCP server at https://YOUR_API_HOST/v1/mcp.

Fields returned in data by Phone Spam Check
Field	Type
phone_e164	string
complaints_total	integer
first_reported	string or null
last_reported	string or null
issue_types	array of string

named fields in every answer

days a repeat lookup is free

lookups on the same key and balance

Latest from the changelog

All changes

Priced in credits

Every LookValid product draws on one shared balance. Phone Spam Check uses 1 credit per number with complaints on record.

See pricing Get API key

Cost

1credit

Per number with complaints on record

Found1 credit
Nothing found0 credits
Repeat inside 7 days0 credits
Errors and invalid requests0 credits

Questions about Phone Spam Check

01How much does Phone Spam Check cost?

1 credit per number with complaints on record. Credits come out of the one balance shared by every LookValid product.

02Am I charged when nothing is found?

No. When the lookup runs and finds nothing, it returns found: false and costs 0 credits. An error costs nothing either.

03How long are results cached?

For 7 days, per account. Repeating the same lookup inside that window returns cache_hit: true and costs 0 credits.

04Which API key do I use?

The same key as every other product. Send it as a Bearer token in the Authorization header. Email hello@lookvalid.com and we set up your account and send the key.

Phone Spam Check

Create a key

Send the request

Read the answer

Priced in credits

Questions about Phone Spam Check

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