Is there an API to check my OpenAI credit balance?

No. OpenAI's admin API exposes costs and usage, not the prepaid balance. The balance is only on the billing page in the dashboard.

Is there an API to check my Anthropic credit balance?

No. The Admin API has usage and cost reports; the credit balance is only shown on the Claude Console billing page.

Do balance checks cost credits?

Not for the endpoints listed here. Apollo's credit stats, Hunter's account call, LeadMagic's credits call, PDL's HEAD request and WhoisXML's balance call are documented as free; Coresignal's search probe doesn't spend collect credits.

Check API credit balance programmatically

The balance endpoint, auth header and response field for every major metered API, and the ones that only show a balance in the console.

17 of 28 common metered APIs let you read your balance or remaining quota with the same key you use for calls: OpenRouter, DeepSeek, Firecrawl, Tavily, Hunter and others below. OpenAI, Anthropic, Gemini and Perplexity don't; their balance is only in the console.

Balance endpoints

Provider	Call	Auth	Read
OpenRouter	`GET openrouter.ai/api/v1/credits`	Bearer	total_credits − total_usage (USD)
DeepSeek	`GET api.deepseek.com/user/balance`	Bearer	balance_infos[].total_balance
Firecrawl	`GET api.firecrawl.dev/v2/team/credit-usage`	Bearer	data.remainingCredits
Tavily	`GET api.tavily.com/usage`	Bearer	account.plan_limit − plan_usage
Bright Data	`GET api.brightdata.com/customer/balance`	Bearer	balance (USD)
Apify	`GET api.apify.com/v2/users/me/limits`	Bearer	maxMonthlyUsageUsd − monthlyUsageUsd
Apollo.io	`POST api.apollo.io/api/v1/usage_stats/credit_usage_stats`	X-Api-Key	lead_credit.left_over
Hunter.io	`GET api.hunter.io/v2/account`	?api_key=	credits.available − credits.used
Prospeo	`POST api.prospeo.io/account-information`	X-KEY	response.remaining_credits
LeadMagic	`GET api.leadmagic.io/v1/credits`	X-API-Key	credits
People Data Labs	`HEAD api.peopledatalabs.com/v5/person/enrich`	X-Api-Key	X-TotalLimit-Remaining header
Crustdata	`GET api.crustdata.com/account/credits`	Bearer + x-api-version	account.credits
Coresignal	`POST …/company_multi_source/search/es_dsl`	apikey	x-credits-remaining header
Instantly	`GET api.instantly.ai/api/v2/workspace-billing/plan-details`	Bearer	subscriptions.credits.available_credits
MillionVerifier	`GET api.millionverifier.com/api/v3/credits`	?api=	credits
SecurityTrails	`GET api.securitytrails.com/v1/account/usage`	APIKEY	allowed_monthly_usage − current_monthly_usage
WhoisXML API	`GET user.whoisxmlapi.com/user-service/account-balance`	?apiKey=	data[].credits

Each provider page has the full curl, the response shape and the gotchas. Two that catch people: Hunter's available is the allowance, not what's left, and Tavily reports what you've used, not what remains.

Three balances in one script

#!/usr/bin/env bash
set -euo pipefail
or=$(curl -sf https://openrouter.ai/api/v1/credits -H "Authorization: Bearer $OPENROUTER_API_KEY" \
  | jq '.data.total_credits - .data.total_usage')
ds=$(curl -sf https://api.deepseek.com/user/balance -H "Authorization: Bearer $DEEPSEEK_API_KEY" \
  | jq -r '(.balance_infos[] | select(.currency == "USD") | .total_balance) // .balance_infos[0].total_balance')
fc=$(curl -sf https://api.firecrawl.dev/v2/team/credit-usage -H "Authorization: Bearer $FIRECRAWL_API_KEY" \
  | jq '.data.remainingCredits')
printf "openrouter  $%s\ndeepseek    $%s\nfirecrawl   %s credits\n" "$or" "$ds" "$fc"

Credits and dollars don't add up: Firecrawl credits are pages, Hunter credits are email lookups. Keep the unit with the number.

No balance API

Anthropic: daily spend via the admin API, no balance.
Crunchbase: nothing to read; count and price calls from your side.
Exa: cost is on every response; sum it yourself.
Google Gemini: nothing to read; count and price calls from your side.
Google Places: nothing to read; count and price calls from your side.
HubSpot Breeze: nothing to read; count and price calls from your side.
OpenAI: daily spend via the admin API, no balance.
Parallel: nothing to read; count and price calls from your side.
Perplexity: cost is on every response; sum it yourself.
Postmark: nothing to read; count and price calls from your side.
SendGrid: nothing to read; count and price calls from your side.

Past one script

A balance on its own tells you where you are, not how long you have. For that you need the series and a burn rate: estimating runway. Argus polls every endpoint above hourly and gives the result to your coding agent over MCP.

Questions

Is there an API to check my OpenAI credit balance?: No. OpenAI's admin API exposes costs and usage, not the prepaid balance. The balance is only on the billing page in the dashboard.
Is there an API to check my Anthropic credit balance?: No. The Admin API has usage and cost reports; the credit balance is only shown on the Claude Console billing page.
Do balance checks cost credits?: Not for the endpoints listed here. Apollo's credit stats, Hunter's account call, LeadMagic's credits call, PDL's HEAD request and WhoisXML's balance call are documented as free; Coresignal's search probe doesn't spend collect credits.