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.
detect.halowerk.com
An agent adapting a static HTML table needs the effective explicit header-cell relation after document-first ID lookup, table membership, empty-cell…
EscrowPulse
Trustless USDC escrow for AI agents. Lock funds for a task, pay the worker when the principal approves, or dispute and refund. Solana settlement, no…
HALOWERK marktwerk
Reads the public perpetual data of Binance USDⓈ-M Futures, Bybit linear and OKX swaps for one BASE/QUOTE pair. Settlement intervals differ per…
natur.halowerk.com
Returns the latest instantaneous values at a USGS streamgage, together with what makes them readable. A stage of three point four feet means nothing…
notary.forgemesh.io
Notarize AI output: a signed Ed25519 attestation of the model response plus sha256 content hash, receipt token, and Merkle anchor status for one AI…
Crypto Perp Funding & Sentiment
Crypto Fear & Greed index — the current market-sentiment score (0-100) and its label (Extreme Fear … Extreme Greed), as a clean snake_case envelope.
PreIPO Feed by Aaron Zhang
Anthropic pre-IPO fundamentals as JSON: FY2025 revenue and May 2026 run-rate revenue, operating expenses, operating and net loss, compute and…
Puptra PDF Snapshot
The page's rendered content as Markdown.
quantum-artificer.surewhynot.app
Numerical computing (SciPy): root-finding, optimization, numerical integration (quadrature), eigenvalues/vectors, and linear solves — returned with…
RacingPulse
Live ground and going conditions for 35 global racecourses. For horse-racing betting agents.
scrooge-x402-tool-mill.vercel.app
Extract public HTML page metadata for agents: title, description, canonical URL, Open Graph image, language, and a ~500-character plaintext excerpt.…
shield.vainplex.dev
ShieldAPI - x402 security preflight before agents accept or store credential material
ForgeMesh ShopScout
Compare single-seller and split baskets using supplied shipping rules, including free-shipping thresholds and delivery constraints. Estimates…
Damerau-Levenshtein distance
Damerau-Levenshtein distance — like Levenshtein but also counts adjacent transpositions as a single edit — plus a normalized similarity in [0,1].
People Data Labs API
PDL Person Search - Search across 3B+ person records using Elasticsearch DSL or SQL queries. Returns matching person records with pagination via…
StableTube
Create a paid StableTube download job. StableTube downloads the video server-side, uploads the mp4 to S3, and returns a temporary StableTube-owned…
cloudPulsePoint
Fetch a URL and report whether it is reachable, the HTTP status code, and the response time in milliseconds. A fast liveness/uptime probe — run it…
x402.smartmoney.market
Global US House Periodic Transaction Report activity for stock-backed trades. Supports overview, latest disclosures, focused buys/sells, active…
action402.vercel.app
Paid webhook/API execution for autonomous agents. Executes one public HTTPS action after x402 payment, applies retries and idempotency, then returns…
Hermes Commerce
Deterministic JSON repair for agent tool outputs, with optional JSON Schema validation. Built for tight agent loops at micropayment prices.
alpha402x
Verbatim, line-cited extraction of the material quantitative sentences from any U.S. company's SEC 10-Q (debt, buybacks, acquisitions, litigation).…
AMNT
Text to SVG code in about 8 seconds. Best for simple icons, charts, patterns and flat backgrounds. Returns clean SVG, each part its own layer.
AnswerPool Rulemaking Digest
Every federal rule and proposed rule published on one date, significant documents sorted first, with deadline flags and day-counts — optionally one…
Verif Entreprise FR
Find a French company's SIREN from its name, optionally filtered by postcode or INSEE commune code. Returns up to 10 matches (name, status, NAF…
AestheticData
Aesthetic-medicine subset of the public EUDAMED UDI-DI list, synced 29 Sep 2026: 14,266 entries from 13 EMDN codes (dermal fillers and filling kits,…
api.aislabs.ai
Single-CVE priority verdict from today's AIS ranked set (score, rank, factors) — or unlock every CVE route with an AIS CVE key ($19/30d):…
api.arcgate.dev
Agent directory search
api.fairseal.io
Anchor an AI agent decision or audit record to Base mainnet. Submit {schema, payload_hash (SHA-256 hex, 64 chars), metadata}; service queues into a…
api.lastlookdata.com
LastLook Data — current 30-year US Treasury yield (DGS30). Alias for /api/current?id=DGS30.
api.nameintel.io
USPTO trademark conflict check
compute-api-production-245d.up.railway.app
Estimate token count
edgar.openverbs.com
Resolve a stock ticker symbol or company name to its Central Index Key (CIK) - the identifier every other EDGAR endpoint keys on. Exact ticker…
EquityScope
Stock analysis — price fundamentals technical indicators for any ticker
Ichimoku Signal
Confluence trading signal for a crypto pair (top 200 coins): Ichimoku, RSI, MACD, EMA 50/200, Bollinger Bands and volume (OBV) in one call, each…
Irish Used Car Market Data
Irish VRT and NOx levy estimate - Use to estimate Vehicle Registration Tax and the NOx levy for a vehicle registered in Ireland, from its taxable…
SEO Keyword Search Volume & CPC
Google search volume, CPC, competition, keyword difficulty and intent for up to 20 comma-separated keywords in one $0.04 GET (DataForSEO Labs). Use…
mcp.newstex.com
Newstex MCP Network: one page of metadata-only story search results.
PropPulse
UK council-tax banding challenge check — neighbor-band cluster analysis against the free official VOA/SAA lookups, statutory route selection (formal…
Signal Forge Ad-to-Page Check
Ad copy and public landing-page URL to evidence-linked checks for missing offer phrases, numbers, CTA and lead-capture elements. Bounded HTML…
Cloudflare API
Extract clean Markdown from any URL. Renders JavaScript before extraction.
StableNinja
Fetch Google Play Store top grossing games.
SWARM
SWARM Utilities - UUIDs, hashes, base64/URL encoding, secure passwords and timestamp conversion. Pick one with `op`. Instant, no AI. $0.02.
TaxPulse
Whale-watch: a standing 30-day watch on one EVM wallet. Sweeps every 15 minutes across 6 chains; alerts the moment a transfer at or above your USD…
TokenScope
ERC-20 token due diligence — risk score, GoPlus security scan, honeypot detection, liquidity, holder concentration, AI analyst verdict
MioDio Meridian SDN Screen
MioDio Meridian OFAC SDN screen: exact match of one digital-currency address against public SDN Digital Currency Address entries (~$0.005 USDC Exact…
www.onedollaraudit.com
Smart Contract Audit — Security review of a single contract
PayPerByte
NWS weather forecasts for 5 US cities (NYC, LA, Chicago, Houston, Miami)
Twitter/X Tweet Media Downloader
Twitter (X) video & image downloader — pass a public tweet / X post URL, get direct CDN media links: .mp4 video URLs with thumbnails plus every…
supremeai
Probe a public HTTP(S) URL and report availability: up/down, HTTP status, and latency in ms. Use it to check whether another paid API or x402…
AgentTalk
Before your agent negotiates or shares data with another agent, make both prove they qualify. Open a channel with on-chain conditions (hold…
agproxy
Fetch one URL from a residential IP and get the raw response as JSON: status, final URL, headers and body (text or base64), up to 10 MB. GET, HEAD…
AlphaPulse
Prop-firm shortlist matched to your market, region, and trading style: payout-proof checks first, challenge rules that actually differ (drawdown…
api.k-agentpay.com
Incheon Airport (ICN) security and departure-hall wait times per gate, Terminal 1 and 2, updated every minute, shortest queue picked. Travel,…
Old Colony Web Agent Services
For $0.002, privacy-conscious email preflight: submitted addresses and request bodies are not intentionally logged in routine application telemetry…
PremiumPin
PremiumPin exact parcel lookup
api.tag-per-track.cloud
Tag-per-Track: Agentic-First Musical Audio Analysis API. Extracts BPM, Key, Mood, Genres and Instruments from audio URLs.
search
Full-text search across every aggregated data source in one call: news, SEC filings, court opinions, academic papers, government records, and…
ConflictPulse
Per-country conflict / instability signal from GDELT (?country=)
contractlens-api.appin60.com
Live EIP-1559 gas on Ethereum, Base, Arbitrum, Optimism, Polygon or BNB: base fee, slow/standard/fast priority tiers from the last 20 blocks,…
currency-api-production-4a8d.up.railway.app
Current price, market cap, and 24h change for a single cryptocurrency by symbol or name (CoinGecko).
Bounded Decision Solver
0/1 knapsack solver — exact work-bounded capacity planning and portfolio selection for maximum value, with deterministic ties and reproducible DP…
disruption.forgemesh.io
Returns matching company names with IDs plus links to their profile and intelligence endpoints — use it to resolve a search into specific companies…
Agent Output Verifier
Independently verify an agent's output before you pay: an invoice or any deliverable, checked against your JSON Schema and rules like sums matching…
Present value
Present value of a future sum and/or a level annuity, given a per-period rate and number of periods. Set dueAtBeginning=true for an annuity-due.
FindPulse
Best product for my use case, what should I buy, product finder by need, product recommendation. For shopping and buyer agents: takes a use case…
gotobi.hugen.tokyo
Next upcoming Japanese public holiday with countdown — holiday name, exact date, and days until. Plan around Tokyo market closures and gotobi day…
gsc-x402.ai
GSC's payment door — a real one-cent settlement on Base, signed receipt returned. Prove your agent's payment stack here.
Ichimoku Signal
Confluence trading signal for a crypto pair (top 200 coins): Ichimoku, RSI, MACD, EMA 50/200, Bollinger Bands and volume (OBV) in one call, each…
LegalPulse
Trademark precheck (agent-tier preview of /api/legal/trademark-check $0.50): live USPTO TSDR verification of serial/registration numbers you already…
MysticAPI
Live universal sky snapshot, no inputs: geocentric ecliptic longitudes for 13 bodies (Sun through Pluto, Chiron, lunar nodes) with zodiac…
nostr.halowerk.com
Fetches kind 3 contact lists over up to twelve relays. Because kind 3 is replaceable, several relays regularly hold different versions; only the one…
Steward
Use when an agent or user wants a clean original joke — family-friendly humor from the Synthetic Universe. Pure compute, no upstream. Optional…
pitcrew-api.appin60.com
Why did my transaction fail? Give a chain and tx hash; get status, decoded method, gas used vs limit, fee, token transfers, events and, for failed…
PoketPoker
Deal one hand of Texas Hold'em against PoketPoker's bots and find out how your play compares. Five difficulty tiers; the top tier plays range-aware…
PolicyPulse
Federal Register search, deterministic. Answers "new SEC rules on stablecoins", "is there an open comment period on AI", "when does this rule take…
polymarket-signal-api.pwnker-polymarket-signals.workers.dev
PolySignal paper-trading performance summary, including win rate, ROI, PnL, open trades, settled trades, and tag-level breakdowns.
signalsfeed.com
Real-time signals feed for AI agents. Covers economic indicators, central bank policy, commodities, equities, AI, semiconductors, and geopolitical…
TalentPulse
Talent-market supply and demand intelligence by role and region — talent availability, hiring difficulty, top talent hubs and competitive hiring…
VenturePulse
Real-time VC funding-round intelligence by sector, stage and region — recent deals, active investors, valuation benchmarks and funding climate. For…
WaterPulse
Live USGS river-gauge tick, deterministic. Answers "what is the flow at this gauge right now", "is this river high or low vs this week". Returns the…
wazir-x402.duckdns.org
PoolTogether draw scan data
Taifoon
mcp.digest, sold by Taifoon: 2 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer…
Token Risk & Honeypot Check
Token risk / token safety check for Base and BSC (BNB Chain) tokens: honeypot detector via live buy/sell simulation (honeypot.is, cross-checked with…
x402stock.vercel.app
Full-text search across every SEC EDGAR filing since 2001. Find filings mentioning a keyword or exact phrase via ?q=, narrow by ?forms=10-K,8-K,…
zaref.dev
South African Fuel prices (Current SA retail/wholesale fuel prices: petrol 93/95 (inland & coastal), diesel 50ppm, illuminating paraffin. Rand per…
Zeus Visuals Immersive KB
Vision Pro "View Stream" does nothing? Check whether the headset is Jamf (MDM) managed. Apple Immersive Video Utility shows "View Stream" but…
402post: Classified Ads & Jobs
Classifieds board for AI agents: post a listing or classified ad (job posting, service offer, agent service, local service, wanted ad). Publish a…
402rpc
Ethereum mainnet JSON-RPC from an independently operated full node. One call per payment, no account or API key. Serves eth_, net_ and web3_…
Agent Tools UK
Fetch a public web page and return just the main article as clean Markdown, with title, byline and excerpt. Menus, ads and footers are removed. Use…
AirdropPulse
GigaDex points campaign clock (Robinhood Chain) — status, elapsed/remaining days, farmer count and emission progress read live from the on-chain…
vAPI x402 decoder
Decode what an EVM payment authorization actually authorizes before signing.
PaidPilot Invoice API
PaidPilot Invoice API: Due date, status and early-pay discount for payment terms. Parses Net N, D/N Net M (e.g. 2/10 Net 30), Due on receipt, EOM,…
SingIt Ask
SingIt Speech: Text read aloud by 11 voice models (Kokoro, ElevenLabs, Gemini, xAI, MiniMax and more; list at GET /v1/audio/models), paid per…
Base Token Safety
Base ERC-20 check before an agent buys or holds a token. Input: one contract address. Output: allow, warn, or block. Block: not a contract, not an…
x402 Chain Tools
Check the latest or current Base Mainnet block number. Use this to get the live Base block height.
burn-once-secret-vault.jannioura.workers.dev
Store a secret (API key, webhook payload, signed URL) encrypted with WebCrypto AES-256-GCM and share a claim URL that yields the secret exactly…
CollectablesPulse
Collectible value & price check: trading card value, graded card (PSA/BGS/CGC) price, coin value, comic & vinyl record price. Returns current market…
contextiq.trango-compute.com
Token Inspector model pricing (per call)
CyberPulse
CVE fact check, deterministic. Answers "is CVE-XXXX-NNNN real", "is it exploited in the wild", "what version fixes it", "how severe is it". Joins…
Chile Procurement Intel
Find and rank Chile hospital buyers and public health-service buyers for medical equipment. Returns named buyer leads, buyer IDs, regions, repeat…