Does CallGrid explain a rejected bid?

Yes. CallGrid documents bid error codes, and its seller page shows statuses such as outbid, won and no agents.

Is CallGrid's MCP read-only?

Yes. CallGrid's MCP is read-only and an admin turns it on. InboundX's account MCP can make the changes your role allows, each one previewed first.

What does CallGrid charge?

CallGrid publishes Static Campaigns at $199/month and Real-Time Bidding at $995/month, then metered usage. Figures are from CallGrid's public pages, checked 6 Nov 2026.

Does CallGrid support real-time bidding or ping post?

Yes, on its public pages: double-blind auction. InboundX answers every ping with a bid that carries the payout, or a no-bid with a reason.

Why do publishers pick InboundX over CallGrid?

Your own publisher portal: Your portal shows your calls, pings, postbacks, earnings and invoices. CallGrid's public pages do not describe a publisher portal. Your own AI on your account: Connect Claude, ChatGPT or another app that supports MCP to your login. It reads your calls, earnings and invoices, and every change comes back as a preview before it happens. CallGrid's MCP is read-only, and an admin turns it on. A bid that holds a buyer: A bid carries the payout and holds a buyer for 15 seconds by default, 10 to 30 per campaign. CallGrid's seller page does not say how long a winning bid holds a buyer. Postbacks that keep trying: A postback your platform doesn't accept is retried every minute for up to 7 days. CallGrid's seller page links webhooks and postbacks but does not describe retries.

Home / Publishers / Compare / CallGrid vs InboundX

CallGrid vs InboundX for publishers

CallGrid sells calls through a double-blind real-time auction, with real-time bidding on its $995 plan. On InboundX, a bid carries the payout and holds a buyer, and your own AI can make changes after a preview.

Pay-per-call tracking and RTB. CallGrid figures are from its public pages, checked 6 Nov 2026. See publisher pricing and how InboundX works for publishers.

01 — Figures

Published side by side

Swipe to compare

CallGrid vs InboundX for publishers: published figures. Not published means the figure was not found on a public page.
Feature	CallGrid	InboundX
Monthly fee	$199 / $995Static campaigns / real-time bidding.	$0No monthly platform fee on a routing account; tracking numbers carry their own monthly rent. $0 to send calls to a network.
Per minute	From $0.04 localFrom $0.05 toll-free.	$0.06One price per connected minute, from a prepaid balance. Numbers have a monthly rent.
Tracking numbers	From $2 per month	Monthly rentEach tracking number has a monthly rent, taken from your balance.
Pings / RTB fee	Not publishedRTB is the $995 plan.	$0No ping or RTB fees.
Real-time bid or ping post	YesDouble-blind auction.	YesA bid carries the payout and holds a buyer for 10 to 30 seconds.
Portal for your publishers	Not published	YesCalls, pings, postbacks, earnings and invoices.
Postbacks or webhooks	YesWebhooks and postbacks.	YesRetried every minute for up to 7 days.
Reason on every no-bid	YesA rejected bid returns a code and a message.	YesEvery no-bid comes back with a plain reason.
Your AI on your account	YesRead-only MCP an admin enables.	YesAccount MCP. Every change is previewed first.

02 — Why InboundX

Why publishers pick InboundX over CallGrid

01
Your own publisher portal
Your portal shows your calls, pings, postbacks, earnings and invoices. CallGrid's public pages do not describe a publisher portal.
02
Your own AI on your account
Connect Claude, ChatGPT or another app that supports MCP to your login. It reads your calls, earnings and invoices, and every change comes back as a preview before it happens. CallGrid's MCP is read-only, and an admin turns it on.
03
A bid that holds a buyer
A bid carries the payout and holds a buyer for 15 seconds by default, 10 to 30 per campaign. CallGrid's seller page does not say how long a winning bid holds a buyer.
04
Postbacks that keep trying
A postback your platform doesn't accept is retried every minute for up to 7 days. CallGrid's seller page links webhooks and postbacks but does not describe retries.

03 — Them

What CallGrid publishes well

CallGrid is a pay-per-call platform that routes and sells inbound calls through a real-time double-blind auction, billed on talk time.

A double-blind auction, billed on talk time.
Sellers see ping times, bid details, revenue per call by source, and a 30-day payouts summary.
A rejected bid returns a code and a message, and an MCP connection is available read-only.

Sellers see ping times and bid details, revenue and revenue per call by source and publisher, and a 30-day payouts summary. Number pools and DNI handle attribution, and conversions go back to sources by webhook or postback.

CallGrid publishes Static Campaigns at $199/month and Real-Time Bidding at $995/month, then metered usage.

04 — InboundX

How InboundX is set up for a publisher

Send calls to a network on InboundX by real-time bid or by phone number. A ping gets a bid that carries the payout and holds a buyer for 15 seconds by default, 10 to 30 per campaign. A no-bid always says why.

Your portal shows calls, pings, postbacks, earnings and invoices. Postbacks are retried every minute for up to 7 days until your platform answers. Connect your own AI to your account over MCP; every change is previewed first.

Sending to a network costs you nothing on InboundX: the network pays you. Routing your own calls to your own buyers is $0.06 per connected minute, with recording, pings and bids included. Each tracking number has a monthly rent.

Publisher pricing · Real-time bidding for calls · Call routing platform · Docs

05 — Questions

CallGrid vs InboundX questions

01Does CallGrid explain a rejected bid?: Yes. CallGrid documents bid error codes, and its seller page shows statuses such as outbid, won and no agents.
02Is CallGrid's MCP read-only?: Yes. CallGrid's MCP is read-only and an admin turns it on. InboundX's account MCP can make the changes your role allows, each one previewed first.
03What does CallGrid charge?: CallGrid publishes Static Campaigns at $199/month and Real-Time Bidding at $995/month, then metered usage. Figures are from CallGrid's public pages, checked 6 Nov 2026.
04Does CallGrid support real-time bidding or ping post?: Yes, on its public pages: double-blind auction. InboundX answers every ping with a bid that carries the payout, or a no-bid with a reason.
05What does InboundX cost a publisher?: Sending calls to a network on InboundX costs you nothing: the network pays you for calls that convert. Routing your own calls to your own buyers is $0.06 per connected minute from a prepaid balance, with recording, pings and bids included and no monthly fee. Each tracking number has a monthly rent.
06Why do publishers pick InboundX over CallGrid?: Your own publisher portal: Your portal shows your calls, pings, postbacks, earnings and invoices. CallGrid's public pages do not describe a publisher portal. Your own AI on your account: Connect Claude, ChatGPT or another app that supports MCP to your login. It reads your calls, earnings and invoices, and every change comes back as a preview before it happens. CallGrid's MCP is read-only, and an admin turns it on. A bid that holds a buyer: A bid carries the payout and holds a buyer for 15 seconds by default, 10 to 30 per campaign. CallGrid's seller page does not say how long a winning bid holds a buyer. Postbacks that keep trying: A postback your platform doesn't accept is retried every minute for up to 7 days. CallGrid's seller page links webhooks and postbacks but does not describe retries.

06 — Next

Start getting paid for your calls.

Apply as a publisher, then test your ping URL before you send a real call.

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Sources, checked 6 Nov 2026