Agent & Infrastructure

Vet an x402 server or any URL for scam/phishing/trust in ONE call: transport, content-safety, domain, metadata + x402-compliance sub-scores, each with transparent evidence

Background removal API: send an image URL, get back a transparent PNG with the subject cleanly cut out (segmentation runs on our own hardware). For product photos, avatars, thumbnails, and design pipelines. Nothing stored.

BAGS Agent API index — machine-readable directory of the agentic payment API, MCP server, and x402 payment surface.

Linear regression API: fit a least-squares line through paired x/y data and get slope, intercept, R-squared goodness-of-fit, and the line equation. For trend analysis, forecasting inputs, and data-science agents. Exact and deterministic.

On-this-day API: notable historical events for any month/day — year, one-line description, and related article links. Fresh daily content for newsletters, social bots, and trivia agents.

Website uptime check API: status code, response time in ms, and key headers for any URL in one call. The heartbeat probe monitoring agents schedule every few minutes.

Matrix math API: determinant, inverse, transpose, eigenvalues, multiplication, and addition for matrices up to 50x50 — exact linear algebra.

Linear regression API: slope, intercept, R-squared, and the equation of the best-fit line through your x/y data points. Least-squares, exact.

HTTP check API: probe any URL and get its status code, response time in milliseconds, server header, content type, and cache policy — an instant is-it-up heartbeat. For uptime monitors, dependency health checks, and pre-crawl validation. SSRF-guarded; scheduled agents welcome.

Geometry API: exact area, perimeter, volume, surface area, and diagonals for circles, rectangles, triangles (Heron's or base-height), spheres, cylinders, cones, cubes, and rectangular prisms — from structured dimensions. Validates the triangle inequality. For CAD, construction, education, and design agents.

Linear algebra API: determinant, inverse, transpose, eigenvalues, multiply, or add matrices up to 50x50 with structured array inputs — exact computation, instant. The linear algebra LLMs can't do reliably in-context. For engineering, graphics, and scientific agents.

Statistics API: mean, median, mode, standard deviation, variance, percentiles (p25-p99), range, sum, and IQR outliers for up to 100k numbers — exact, deterministic.

English dictionary API: definitions with part of speech, pronunciation, syllable count, synonyms, and antonyms for any word in one call. Unknown words return closest-spelling suggestions instead of an empty error. Structured JSON built for agents that need word meanings without scraping a dictionary site.

Descriptive statistics API: feed up to 100,000 numbers and get count, sum, mean, median, mode, sample standard deviation, variance, min/max/range, percentiles (p25/p50/p75/p90/p99), and IQR-flagged outliers. Deterministic and auditable — cheaper than burning reasoning tokens, zero arithmetic-hallucination risk, and the result can be cited. For data QA, monitoring, and analysis agents.

Chemical element API: atomic number, atomic mass, electron shells, electronegativity, and physical properties for any element. Local dataset, instant.

Cron expression parser API: validate any cron expression and get its next N run times as ISO timestamps in any timezone. For scheduler-building and automation agents.

Sunrise and sunset API: sun times (sunrise, sunset, solar noon, golden hour) plus moon phase and illumination for any coordinates and date, computed instantly. For photography, agriculture, solar, and outdoor-planning agents.

Batch Semaphore Proof Verifier: Batch verify up to 10 Semaphore proofs in a single request. Returns per-proof results with total count and average duration. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/verify_batch.

World ID Proof Verifier: Verify a World ID 4.0 proof via the Worldcoin Developer Portal API. Generates an RP signature server-side, then proxies the full IDKit proof to developer.world.org. Returns { valid, nullifier, worldcoin_response }. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/verify_worldid.

PyPI package inspection API: latest version, summary, license, requires-python, dependency declarations, and yank status for any Python package. The pre-install hygiene check for Python coding agents.

Phone number validation API: is this number valid, what country is it from, and how should it be formatted (E.164, national, international)? Line-type detection included. For lead cleaning, forms, and CRM agents.

Tech news pulse API: the current 30 top-ranked tech stories from the leading hacker community front page — title, outbound article URL, points, author, comment count, and ISO timestamps as normalized JSON. Use for tech trend detection, topic monitoring, newsletter pipelines, and content agents. Cached 3 minutes.

Encyclopedia summary API: the lead summary of any English-language encyclopedia article — title, one-line description, extract paragraph, thumbnail, and canonical URL — as JSON. For entity enrichment, fact grounding, and knowledge agents. CC BY-SA content with attribution included.

Postal code API: city, state, and coordinates for any zip/postal code in 60+ countries, and reverse place-to-codes search. For address validation, shipping, and geo-enrichment agents.