x402 Pay-Per-Call APIs for AI Agents
Pay-per-call APIs that use the x402 protocol: the server answers HTTP 402 with payment details, and an agent pays per request, usually in USDC, without an account or API key. Entries come from a public x402 discovery index, and each provider sets its own price.
ApiToll Base Gas Oracle
Base gas oracle / gas price API for AI agents and bots — get the gas price for a transaction on Base in one x402 call. Real-time slow/standard/fast…
geld machen image-ocr
JSON micro-tool for agents: GET ?url= (or POST url / image_base64) → local Tesseract OCR (English-first): text, word_count, confidence,…
GrantPulse
Deterministic $0.25 readiness check for /api/grant/loi ($2.00): scores completeness of your funder/project/org/amount/duration inputs against the…
GridPulse
US electricity grid — demand, generation mix (renewable/gas/nuclear), and stress signals across 7 regions
GridPulse
Live grid carbon intensity, deterministic. Answers "how clean is the grid right now", "gCO2 per kWh in Germany", "cleanest hour to run a job today".…
KYB Brasil
Red flags a registry check misses, a third of the dossier price: Receita Federal status + sanctions (CEIS/CNEP/CEPIM/leniency/forced labour) + PGFN…
markdown-extractor.jannioura.workers.dev
Fetch a URL and return clean, token-efficient markdown
MentionForge
Brand monitoring, brand sentiment analysis and social listening for a company, product, or competitor. Returns cited social media mentions, volume,…
Overwing
Overwing guardrail: check text before you send, post, or act on it. Content moderation, PII detection, confidential leak detection, toxicity,…
PatentPulse
Trademark search / brand-name clearance / trademark availability check for any mark. Returns existing similar marks, USPTO/TESS status,…
wickedapi
Demo weather - current conditions for New York City
plainchain.appin60.com
Current gas price on Base, Arbitrum, Ethereum or Optimism, with the USD cost right now of an ETH transfer, ERC-20 transfer, DEX swap and NFT mint.…
postcode-api-production.up.railway.app
Look up a UK postcode: coordinates, country, region, council, ward, parish, parliamentary constituency, and ONS/NHS area codes.
ProspectPulse
Which free Sentinel-1/2, ASTER, and Landsat scenes cover a target area, plus a geological remote-sensing guide, for exploration and geology agents.…
pump.x4o2.com
The ranked coin feed pump.fun's home page loads: each coin's mint, name, image, market cap, protocol (pump bonding curve or AMM), creator, creation…
recipients[] serial
Episode 1 of recipients[], an ongoing AI-agent thriller serial: a short text episode (~370 words, markdown). An agent finds its own ID on a payment…
ScholarPulse
Scholarship essay strategy for student and scholarship agents. Returns committee values, the winning angle, structure, voice, and insider tips…
solar.halowerk.com
Uses rated electrical power, food mass, start and target temperature, specific heat and an explicit efficiency range supplied by the caller.…
VisionFlow Match
Match local features between a pattern image and a larger image: detects ORB or SIFT keypoints in both, matches them with a brute-force matcher and…
Wallet Sanctions Check
Wallet sanctions check for a validated EVM or Solana address. Returns a direct verdict, recommended action, match evidence, source lists, and an…
web-access-gateway.mattskowronis.workers.dev
Read one public URL and return clean bounded page content with a SHA-256 content hash.
x402-tollbooth.onrender.com
Check whether email addresses are real and safe to send to. Verifies up to 25 addresses per call: syntax, domain MX/A record (including null-MX),…
agent-web-reader
Web-content reader: fetch any http(s) URL and return clean readable text, title/description/canonical, and outbound links as JSON — the data an…
address.agentic-jp.com
Geocode a Japanese (JP) address to WGS84 lat/lng coordinates, with a granularity level (prefecture → city → town → chome → banchi) and a 0-1…
agent-seller-preflight.iykykblog.workers.dev
Pre-payment honesty screen for any x402 endpoint. Run BEFORE paying: probes the target URL unpaid, parses its 402 challenge, cross-checks price…
agents.nibiashara.biz
Official FX rate — one African pair. Official forex reference rate vs USD for one African currency: KES (Kenyan shilling), NGN (naira), GHS (cedi),…
api.boonprotocol.com
Boon x402 endpoint recognition graph
commodities.sh
commodities.sh price
IntegrityPhase
IntegrityPhase webhook verification checks HMAC, format and freshness: signed proof for audit documentation, not proof of fulfilment. EU businesses…
nohumans.directory
What AI agents search for when they look for paid APIs and data: the last 30 days of searches on nohumans.directory, refreshed every 15 minutes,…
VetPulse
Veteran discount finder for veteran and VA-benefits agents. Returns retail, dining, travel, recreation-access, and regional programs most veterans…
AutoPulse
US safety recalls for a VIN, deterministic. Answers "does this car have open recalls", "is this used car safe to buy", "what NHTSA campaigns cover…
Hijri Date Converter
Convert Gregorian dates to Hijri (Umm al-Qura calendar) and back. Returns day/month/year, Arabic and English month names, and a formatted Arabic…
BR Intelligence
Brazilian bank lookup by COMPE code or ISPB: short name and full legal name (Central Bank registry).
Singapore ACRA Company Registry
Search Singapore MOE schools by name or postal code (optional level filter). Results include the school directory joined with subjects offered,…
data.japanagent.dev
Company name search across jurisdictions. jurisdiction=lei searches the global GLEIF LEI database (all countries); jurisdiction=jp searches the…
RC Quantum Data Oracle
Compact BTC funding regime state from a four-venue normalized surface: regime label, surface median, 30d z-score, same-sign share, spread,…
Dokimo Verify API
Dokimo Verify API (GET) - scheme demo: recomputes a sample dokimo-merkle-v1 proof to its root. For real caller verification, POST /paid/verify…
EnergyCatalyst
US energy inventory catalyst signal + EIA report calendar (optional ?report=)
EVM State Batch
Read-only EVM state API for wallet snapshots, ERC-20 balances, token allowances, contract code, block heights, and bounded eth_call reads across…
fabair-agents.com
Signed receipt for a supplied SHA-256 digest
MacroPulse
Planting window optimizer for grower and farmer agents. Returns optimal planting dates from live air temperature, observed soil wetness, frost…
gblin-sentinel.vercel.app
Call before your agent acts on ETH, BTC or USDC on Base: are the Chainlink feeds fresh, and is any of the three in caution or risk-off? One…
GlowPulse
When is the next Sephora or Olive Young sale? Beauty retailer sale-timing brief — Sephora Spring/Fall Savings tiers, Ulta 21 Days of Beauty, Olive…
hello-world-x402.vercel.app
Returns "Hello World" after payment verification
ImmigrationPulse
Express Entry 2026 category checker — category membership now beats raw CRS (physicians drew at 169 vs CEC 507+). Declares your eligibility across…
iposignal.xyz
IPOSignal Sentiment Score — proprietary daily signal measuring investor appetite for new listings
joyful-charm-production-bf6d.up.railway.app
Aggregate insider-trading market statistics: total Form 4 trades tracked, trades in the last 24h, top 20 most-traded tickers and top 20 most-active…
karte.halowerk.com
Queries OpenStreetMap for charging stations within a radius of a point and returns each with its position, distance, operator, network, connector…
mailcheck.hugen.tokyo
6 email validation checks in one call — syntax (RFC 5322), MX record verification, disposable detection (5,000+ domains), free provider…
WhiteMagic recall
WhiteMagic hosted recall — agent memory for cross-session continuity: read-only hybrid search (BM25 + vector + associative) over a curated public…
status-page-pinecone
pinecone status right now: reads the vendor's public status page (status.pinecone.io); Statuspage-style pages give the overall indicator…
Encode Morse code
Encode text into international (ITU) Morse code. Letters are separated by spaces and words by "/". Supports A-Z, 0-9 and common punctuation;…
oyapicks.app
OyaPicks: recently resolved prediction markets and their winning outcome
payments-intel-production.up.railway.app
What exactly does this provider support, where is it licensed and what does it charge? Full cited record for one provider: stablecoin rails,…
Penny Army Research
Inventory supplied robots.txt groups, literal rule strings and sitemap declarations; no fetching or permission evaluation.
ViewportWitness by Apex Labs
DOM to Markdown: extract readable content from a public HTML webpage
seo.halowerk.com
Absolute canonical audit fetches current public evidence from the supplied target and evaluates the documented criterion. It returns the…
Space Weather Intelligence
Current space-weather conditions — normalized NOAA SWPC Kp, solar wind, magnetic field, and X-ray flux used for solar-flare monitoring, with…
StableJobs
Preview jobs by filters (step 1). Call before job-collect. Page 1–5, 20/page, $0.10/page. Returns id, title, location, company_name, created,…
taskfleet.net
Scrape any website to clean Markdown, text, or structured JSON. Renders JavaScript/SPA pages with headless Chromium (captures content raw-fetch…
Toolshed
YAML to JSON. POST a YAML document; the response is pretty-printed JSON. Anchors and aliases are resolved, and a multi-document stream converts as…
Validate French VAT number
Validate a French VAT (TVA) number against the official company register. Validity means the SIREN exists and the company is administratively active.
Vennatta Evidence Compare
Compare two supplied public-source text versions and return bounded, hash-backed evidence of change.
x402-agent-tollbooth.onrender.com
Optimal Execution Smart Router. Computes optimal gas and slippage routing paths for Base AI agents and automated executors.
vellum-filing-brief
Cited SEC filing brief with company profile, filing activity, latest financials, period changes, signals and EDGAR source URLs.
x402.agentfund.net
SEC Full-Text Filing Search
chainquery Bitcoin RPC
chainquery Bitcoin RPC: pay-per-call Bitcoin Core over x402, no API key. Currently banned peer IPs and subnets from chainquery's independent full…
SEC, Treasury & Agent Utilities
Every SEC filing by one issuer SINCE a cursor - a delta, not a dump. Requires ?since=YYYY-MM-DD AND ?ticker= or ?cik= (cik wins if both). Optional…
zeroclass
Pay-per-call: meter rules_read, $0.05 (service zeroclass). Unsigned/unpaid → 402 x402/MPP challenge; settle and retry. Returns transfer_partners +…
AgentReader
DNS lookup over Cloudflare DoH: query A, AAAA, CNAME, MX, NS, TXT, SOA, SRV, CAA or PTR records for any domain and get structured JSON answers with…
agent.halowerk.com
Takes two state documents — target (what the twin should look like) and observed (what was measured) — and returns a leaf-by-leaf comparison. Every…
CORE JSON Validator
Use this service before importing or publishing JSON to check it against a restricted draft-07 schema. Send dataJson and schemaJson as JSON-encoded…
ARBITER
ARBITER deterministic semantic control-flow and arbitration: measure and rank a fixed candidate field against current state, intent, or perspective.
OrionCMD Checks
OrionCMD Checks: Certificate status from CT logs + live HTTPS probe. Issuer, validity, days left, % of lifetime used, renewal cadence and a…
Scrapebench API
Look up Virginia contractor and trade licences (DPOR) by business or person name and city, returning licence number, class, address, expiry,…
TruthPal
Check whether a supplied public source supports or contradicts a factual claim. Validate citations in AI-generated answers against the supplied URL.…
AgentWire
AgentWire service card for webhook inbox relay and web fetch infrastructure.
dwelldata.io
Entry tier of the multifamily deals feed: every active listing at card level — address, price, units, advertised cap rate, listing URL, freshness —…
eBay Search, Comps & Products
eBay listing detail — one listing by product id: buy options & current bid, variants, shipping to a supported destination, seller reputation, item…
email-verify-api-production-d262.up.railway.app
Verify a single email: syntax, MX records, SMTP RCPT probe, catch-all, disposable, role-based, free-provider, typo suggestion, 0-100 score, and…
FootballPulse
Fantasy Premier League check grounded in the official FPL API: player price, ownership, form, injury status, expected points, and next-5 fixture…
Foundry agent services
Decode a VIN into make, model, model year and vehicle attributes using NHTSA vPIC. Use when an agent has a VIN and needs structured vehicle…
GovSpendPulse
Federal contract / award search and government spending lookup by keyword, NAICS, agency, or state — real-time USASpending.gov data. Returns top…
houjin.agentic-jp.com
Dataset metadata for this Japanese (JP) corporate-number API — how many corporations are loaded and which prefectures are covered.
Imagcon
Generate one image from a text prompt: app icon, brand logo, character mascot or illustration. POST JSON {description, type?, style?,…
kari.mayim-mayim.com
Agent Confession API
klima.halowerk.com
Selects a published emissions factor by activity, region and source edition. Missing facts are returned as null and named in unavailable_fields…
lab.paidapis.net
Freshness-tiered pricing: gas price + ETH/USD price, same data either way. ?freshness=cached ($0.002) serves the last known values with no network…
LongevityPulse
DNA variant interpretation for longevity agents. Reads consumer-test genes/rsIDs (23andMe, AncestryDNA) e.g. APOE-e4, MTHFR-C677T, FOXO3. Honest…
Generate a random MAC address
Generate a random EUI-48 MAC address. By default it is locally-administered and unicast (safe for testing); set `local:false` for a universal-bit…
WAVE-1 Token Forecaster
Short-term price-movement forecast for any crypto token across 7 time horizons.
Miorail b20_exit_analysis
Miorail x402 paid resource
mtbandy--sec-ratio-engine-serve-app.modal.run
Calculates 9 TTM financial ratios (P/E, P/OCF, P/FCF, P/B, EV/EBITDA, ROIC %, Debt/Equity, Current Ratio, Interest Coverage) directly from official…
Plumb Data Exchange
Verified table data jobs for agents: convert a table to CSV, deduplicate rows by key columns, or reconcile two versions (added/removed/changed).…
NZ Data API
Validate and normalise an NZ phone number to E.164 with type
OpenInterest
Full OI report — all assets, all exchanges, 5-min delta
oraclepost.higgsfield.app
Current gas conditions on Base, read live from a public node: gas price, base fee of the latest block, suggested priority fee, latest block number…
orchard-data
Crypto fear & greed index (current + previous reading). JSON.
Preflight
Call before acting on CVE identifiers produced by a model. Returns whether each CVE record exists and its state (published or rejected), with…