Bing Search API

$0.005 per call, pay only for 200 responses
JSON object with bing_data containing ranked title, link and snippet fields.

/bing5 credits / requestSearch

x402 pay per call

$0.005 per successful call, paid in USDC on Base. No account or API key required. The live PAYMENT-REQUIRED header quotes the authoritative price.

curl request

curl -i 'https://api.fastaf.co/x402/v1/bing?query=what+is+api'

Example 402 payment challenge

Illustrative recipient address, not a payment destination. Request a fresh challenge, sign it with an x402 v2 client and retry the same URL with PAYMENT-SIGNATURE. The header is base64 JSON v2; the compatibility body uses v1 aliases on Base. Only successful results settle.

HTTP/1.1 402 Payment Required
Content-Type: application/json
PAYMENT-REQUIRED: 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

{
  "error": "payment_required",
  "x402Version": 2,
  "resource": {
    "url": "https://api.fastaf.co/x402/v1/bing?query=what+is+api",
    "description": "Bing web search results",
    "mimeType": "application/json"
  },
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:8453",
      "amount": "5000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "payTo": "0x1111111111111111111111111111111111111111",
      "maxTimeoutSeconds": 300,
      "extra": {
        "name": "USD Coin",
        "version": "2"
      }
    }
  ]
}

Decoded PAYMENT-REQUIRED header

{
  "x402Version": 2,
  "resource": {
    "url": "https://api.fastaf.co/x402/v1/bing?query=what+is+api",
    "description": "Bing web search results",
    "mimeType": "application/json"
  },
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:8453",
      "amount": "5000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "payTo": "0x1111111111111111111111111111111111111111",
      "maxTimeoutSeconds": 300,
      "extra": {
        "name": "USD Coin",
        "version": "2"
      }
    }
  ]
}

JSON discovery response example

JSON object with bing_data containing ranked title, link and snippet fields. This example is illustrative.

{
  "bing_data": [
    {
      "title": "What is an API?",
      "link": "https://example.com/api",
      "snippet": "An interface between applications.",
      "rank": 1
    }
  ]
}

Response with an API key

The same data over REST with a prepaid key. The JSON body is the example above; failed requests are not charged.

curl -H "Authorization: Bearer $FASTAF_API_KEY" 'https://api.fastaf.co/v1/bing?query=what+is+api'

MCP tools

bing_search MCP tool calls require an API key or OAuth; x402 payments apply to HTTP data calls.

Full endpoint reference for agents

Pricing

x402: $0.005 per successful call, USDC on Base, no account. API key: 5 credits per request from one-time credit packs, without expiry. Credit packs are shared by every endpoint and never renew.

Pack	Price	Credits	Per call	Per 1,000 calls
Starter	$10	20,000	$0.0025	$2.50
Growth	$29	75,000	$0.00193	$1.93
Scale	$99	300,000	$0.00165	$1.65
Pro	$299	1,000,000	$0.0015	$1.50
Business	$799	3,000,000	$0.00133	$1.33

Free: 500 credits every month after email verification, no card. See pricing. Alternatives: FastAF vs SerpApi, vs toll402, vs serp402, vs AgentBIT, vs Amazon PA-API.

Parameters

Name	Description
query	Required web search keywords; no default.
mkt	Market such as en-US; omit for source default, mutually exclusive with cc.
cc	Two-letter country code such as us; omit for source default, mutually exclusive with mkt.
first	Starting result position, integer at least 1; default 1.
count	Requested result count, integer 1-50; actual count varies, omitted uses source default.
safeSearch	Adult-content filter: Off, Moderate or Strict; omitted uses source default.
filters	Opaque Bing filters copied from a Bing search URL; omitted means no explicit filter.
lat	GPS latitude for search origin; omitted uses source default.
lon	GPS longitude for search origin; omitted uses source default.

Response fields

bing_data
title
link
snippet
rank

Passing these fields to an LLM? See token-aware scraping for small agent contexts.

Guides

Add FastAF to Claude Code, Codex and Cursor
One remote MCP server, three clients: the claude, codex and Cursor mcp.json setup for https://api.fastaf.co/mcp, with the API key auth it really uses.
Detect poisoned or incomplete SERP results in AI agents
A practical checklist for agents that read Google results: spot empty, partial, injected or lookalike results before they reach the model.

FAQ

What input does this API accept?

Required web search keywords; no default.

What does the response contain?

JSON object with bing_data containing ranked title, link and snippet fields.

How much does one Bing Search API call cost?

With x402 it is $0.005 per successful call in USDC on Base, with no account. With an API key it is 5 credits per request, which is $0.0025 on the $10 Starter pack down to $0.00133 on the $799 Business pack. Failed requests are never charged.

Do I need an account or an API key for Bing Search API?

Not for x402: send the request, pay the 402 challenge in USDC and retry. For credits, sign up free, confirm your email and use the API key in the Authorization header. Accounts get 500 free credits every month after email verification; they do not apply to x402.

Other APIs

Google SERP API
Structured web search results
Google Maps API
Place search and place details
Google News API
Current news search results
Google Jobs API
Job listings and apply links

All APIs → · Guides and benchmarks on the blog →