WhatsApp number check API: best providers in 2026

WhatsApp number check API comparison: how we tested each provider, and what each one costs

NumRadar, #1 of 4

We tested NumRadar on 6 and 14 November 2026 with all 32 numbers. In the Datacircle benchmark, NumRadar scored 73.6 out of 100 overall and 100 out of 100 for accuracy. Best for: the lowest price per 1,000 phones. For price, we leave out providers that score below half the top Accuracy score.

Price on the cheapest plan for each number of phones:

• 1,000 phones: $10.13 a month with NumRadar's Starter plan
• 10,000 phones: $32.63 a month with NumRadar's Growth plan
• 100,000 phones: $111.40 a month with NumRadar's Business plan
• 1,000,000 phones: $1,060 a month with NumRadar's Enterprise plan

NumRadar's results in our benchmark:

• Numbers checked: Right 32 of 32 · Wrong 0 of 32 · No answer 0 of 32
• Time per number: Median 0.82 s · 10th percentile 0.64 s · 90th percentile 3.53 s · Fastest 0.04 s · Slowest 6.74 s · Baseline 0.17 s
• The check call: Call POST api.numradar.app/v1/validate (phone, the number with its +) · Charged per number $0.002, nothing when the number fails its local check

ZelNum, #2 of 4

We tested ZelNum on 14 November 2026 with all 32 numbers. In the Datacircle benchmark, ZelNum scored 66.4 out of 100 overall and 100 out of 100 for accuracy. Best for: the most accurate answers. NumRadar and Listar are as accurate as ZelNum.

Price on the cheapest plan for each number of phones:

• 1,000 phones: $100 paid once, enough for 13.1 months ($7.63 a month), with ZelNum's Pay as you go, $100 top-up
• 10,000 phones: $1,000 paid once, enough for 15 months ($66.67 a month), with ZelNum's Pay as you go, $1,000 top-up
• 100,000 phones: $2,000 paid once, enough for 3.1 months ($645.16 a month), with ZelNum's Pay as you go, $2,000 top-up
• 1,000,000 phones: no plan gives a price

ZelNum's results in our benchmark:

• Numbers checked: Right 32 of 32 · Wrong 0 of 32 · No answer 0 of 32
• Time per number: Median 0.62 s · 10th percentile 0.59 s · 90th percentile 1.43 s · Fastest 0.01 s · Slowest 2.51 s · Baseline 0.11 s
• The check call: Call POST api.zelnum.com/api/v1/realtime/check/phone (identifier, the number in E.164, and product_ids [47]) · Charged per number $0.0076, nothing when it turns the number away (HTTP 400) or answers unknown

Listar, #3 of 4

We tested Listar on 14 November 2026 with all 32 numbers. In the Datacircle benchmark, Listar scored 63.1 out of 100 overall and 100 out of 100 for accuracy. Best for: the most accurate answers. NumRadar and ZelNum are as accurate as Listar.

Price on the cheapest plan for each number of phones:

• 1,000 phones: $22.51 a month with Listar's Starter top-up
• 10,000 phones: $1,125.30 paid once, enough for 5.6 months ($200.95 a month), with Listar's Silver top-up
• 100,000 phones: $11,253 paid once, enough for 6.3 months ($1,786.19 a month), with Listar's Gold top-up
• 1,000,000 phones: $281,325 paid once, enough for 24 months ($11,721.88 a month), with Listar's Elite top-up

Listar's results in our benchmark:

• Numbers checked: Right 32 of 32 · Wrong 0 of 32 · No answer 0 of 32
• Time per number: Median 0.47 s · 10th percentile 0.03 s · 90th percentile 0.59 s · Fastest 0.03 s · Slowest 0.63 s · Baseline 0.12 s
• The check call: Call POST api.listar.fr/search/verify-whatsapp (phones, the number with its +, one a call) · Charged per number $0.0225, nothing when its answer is null

ProWebLook, #4 of 4

We tested ProWebLook on 27 October and 14 November 2026 with 15 of the 32 numbers. In the Datacircle benchmark, ProWebLook scored 50.5 out of 100 overall and 90 out of 100 for accuracy. ProWebLook's best rank is #2, for price.

Price on the cheapest plan for each number of phones:

• 1,000 phones: $120 paid once, enough for 20 months ($6 a month), with ProWebLook's WhatsApp One-Time 20K pack
• 10,000 phones: $400 paid once, enough for 10 months ($40 a month), with ProWebLook's WhatsApp One-Time 100K pack
• 100,000 phones: $3,072 a year paid up front with ProWebLook's WhatsApp Annual 100K plan
• 1,000,000 phones: no plan gives a price

ProWebLook's results in our benchmark:

• Numbers checked: Right 15 of 15 · Wrong 0 of 15 · No answer 0 of 15
• Time per number: Median 1.81 s · 10th percentile 1.26 s · 90th percentile 2.79 s · Fastest 0.50 s · Slowest 3.60 s · Baseline 0.28 s
• The check call: Call GET lookup.proweblook.com/api/v1/wavalidation (phone_number, the number with its +) · Charged per number $0.016. Some misses are free and others cost the same as a hit