APIs for an autonomous research agent in 2026

The research loop in a few lines

An agent searches, reads the best pages and writes. With SpecStream the search already returns the answer with the page that printed it, rows with the facts the question asks for, and the sources it read, each with its url. took_ms and price_usd come back on every reply.

import os, requests

API = "https://api.specstream.ai/v1"
H = {"Authorization": f"Bearer {os.environ['SPECSTREAM_API_KEY']}"}

# 1. Search: an answer with its source page, typed rows and the results read
s = requests.get(f"{API}/web-search", headers=H,
                 params={"q": "Which companies make solid-state batteries for cars?"}).json()["data"]
print(s["answer"], s["took_ms"], s["price_usd"])

# 2. Read the top pages in full: $0.0008 a page, a page with no text is free
urls = [src["url"] for src in s["sources"][:5]]
pages = requests.post(f"{API}/extract", headers=H,
                      json={"urls": urls, "format": "markdown"}).json()["data"]["results"]
texts = [p["text"] for p in pages if p["status"] == "ok"]

# 3. A list too long for the context window: hand it over as rows
# s["handoff"] names the call that prices the full list

Source URL and read time on every value.

A day of agent traffic costs less

Parallel's own guide prices an agent that runs 1,000 searches and 1,000 page reads a day at about $6 a day, or about $2 with its fast search. On SpecStream the same day costs $5.80 on the default search, which brings an answer and typed rows, and $1.80 on the fast tier. Pages are $0.80 per 1,000 on both.

The search your agent reads from scores highest

Parallel's guide gives its Advanced search 97% on SimpleQA Verified and 57.6 on WideSearch. The SpecStream Search API scores 97.9 F-score on all 1,000 SimpleQA Verified questions (978 correct), 64.0 item F1 and 43.4 row F1 on all 200 WideSearch tasks. The Extract API scores 0.908 F1 on WCXB. Scores and method are on the benchmarks page.

Long lists leave the context window as rows

A question like "every company that makes solid-state batteries for cars" outgrows a context window long before row 300. A search reply for a list carries handoff: the size of the full list and the call that prices it. Deep Search then works until it reaches the count, up to four hours on the largest lists, and returns structured rows with facts from many sites joined into one record. You pay 5¢ a row with up to 5 facts, 15¢ with up to 15, and $1 for a deep row. The searches and pages behind each row are not billed.

Limits an unattended agent cannot pass

Give the agent its own key with spend_cap_cents, the most it can ever spend. A call over it is refused with 403. zero_retention keeps no request text and no answer after the reply. An Idempotency-Key makes a retry safe: a call is charged once per key. A busy reply is 503 with Retry-After and charges nothing, and the Python and TypeScript SDKs (1.3.2 and later) retry it once by themselves when the wait is 10 seconds or less.

curl -X POST https://api.specstream.ai/v1/account/keys \
  -H "Authorization: Bearer <OAuth token>" \
  -H "Content-Type: application/json" \
  -d '{"name": "research-agent", "scopes": ["account:read", "finds:spend"], "spend_cap_cents": 5000, "zero_retention": true}'

The research stays up to date

Save a Deep Search request and it reruns hourly to yearly. Each row comes back labeled changed, unchanged or no longer matching, so rechecking 1,000 rows that did not change costs $10. New matches arrive in Slack, email, a sheet, a CRM or a signed webhook, and your agent reads them over MCP.

Tavily

Search, Extract and Research billed in credits at $0.008 each pay as you go. A basic search is 1 credit, so $8 per 1,000. Basic Extract costs 1 credit per 5 URLs, so $1.60 per 1,000. Research takes 4 to 250 credits a request. On SpecStream a search is $1 to $5 per 1,000 and a page $0.80 per 1,000.

Firecrawl

Scrape, Search and Crawl billed in credits on monthly plans, from 5,000 credits to 1,000,000 a month. Its Agent is in preview with 5 free runs a day, then dynamic pricing. SpecStream bills a search, a page or a delivered row at a price set before the call.

Linkup

A search API at $0.005 to $0.006 a request, with a research tier at $0.25 to $2.50 a request. On SpecStream the fast search is $0.001 a call, and Deep Search returns rows with the columns you asked for.