All projects on Base

Test whether a RE2 pattern matches anywhere in the input. Returns { matched }. RE2 guarantees linear-time evaluation, so this is safe against catastrophic backtracking. An invalid pattern is a clean 400; no match is a successful 200.

Convert between a spreadsheet column letter and its 1-based index in either direction. Provide exactly one of `letter` (e.g. "AA") or `number` (e.g. 27); the response always contains both.

Decode any x402/HTTP error into structured recovery instructions. POST /decode-error {"status": 402} or {"status": "timeout"}. Returns meaning, action, retries, backoff, and fix.

Country inflation and CPI history from World Bank WDI: annual consumer-price inflation (%) and consumer price index (2010=100), by ISO3 country for the last 1-10 complete years. Includes independent latest values, units, nulls, source update date and IMF/CC BY attribution. Annual history, not monthly releases or forecasts; CPI levels do not compare prices across countries.

Payment security firewall scan for an OUTGOING x402 payment: PII/secret leak detection in payment metadata, nonce replay detection, overpayment detection, prompt-injection-triggered payment analysis (fast + deep tiers), canonical-USDC asset verification, merchant pinning, velocity/spend caps, and counterparty reputation cross-check. Returns allow/flag/block with per-check reasons and an Ed25519-si

U.S. Census demographic data by state or county. Population, income, poverty, unemployment, home values, education.

Can an agent pay at mercadolibre.com.ar? Rails, endpoint, price, freshness. $0.001. Cached report stays free at /api/v1/hosts/mercadolibre.com.ar.

Checks one address on Ethereum, Base, Arbitrum, Optimism, Polygon or BNB Smart Chain against the open verification registry and against the chain itself. For a proxy the answer is deliberately split in two: whether the proxy is verified says almost nothing, whether the implementation it currently points to is verified is the real question, and both are reported separately with the implementation a

Resolve a 20-character Legal Entity Identifier (LEI, ISO 17442) to its authoritative entity record: verified legal name, registration status (ISSUED/LAPSED/RETIRED), entity status, jurisdiction, legal form, registration number, legal and headquarters addresses, key dates (registration, last update, next renewal), managing LOU, corroboration level and any BIC codes. ISO 7064 check digits are verifi

Get ERC-8004 registration JSON for memoryapi.org — a complete example of an AI agent registration file with 28 MCP services and x402 support.

Look up a domain: registration data from RDAP (registrar, created, expires, status, nameservers), live DNS records (A, AAAA, MX, NS, TXT, CNAME), the TLS certificate served at the name (issuer, validity, alternative names, fingerprint), and the HTTP front door (status, server, redirect). One JSON answer, no API key, no rate-limited WHOIS. GET with ?name= or POST. $0.005.

Complete real-time cryptocurrency price snapshot from the FTSO Yggdrassil value provider

Vet a directory, publication or sponsor pitch before paying: domain age (RDAP), Tranco rank, Google News presence, outbound-link dilution, badge and pay-to-play signals, score 0-100 with red flags

Check a public website before deploy: test mobile website layout, accessibility, browser errors and screenshots across three viewports

Send any x402 resource URL, get a trust verdict on the endpoint itself. Returns TRUSTED / CAUTION / AVOID with a 0-100 score from an observation-only live probe (never pays the target): payment terms, Bazaar discovery-schema quality, CDP Bazaar and PayAI catalog presence, plus a diff against the previous check. Use this when an agent is about to pay an unfamiliar x402 endpoint and needs to know it

Locus public pay-per-use API

Fetch any public web page or PDF and return clean Markdown, plus title, description, author, publish date, JSON-LD and outgoing links. Built for LLM agents.

MUR exchange rates (Bank of Mauritius): Bank of Mauritius consolidated indicative rupee exchange rates for GBP, USD, EUR and JPY (per 100), with buy/sell/mid and ~26 business days of USD/EUR/GBP history.

Full exclusion report from the HHS-OIG LEIE, SAM.gov, and 16 state Medicaid lists: every match with agency, dates, NPI, UEI and CAGE.

Polymarket prediction-market listings. Query: ?limit=1-100. Source: Polymarket Gamma API (free).

Cross-protocol risk-adjusted DeFi yield screener: ranked pools with honest base-vs-reward APY split, trap flags, and 0-10 risk overlay

Base token risk report with an AI-written plain-English summary. Checks what most scanners miss: whether the creator or launch wallet can pull the pool liquidity (incl. Uniswap V4), copycat tokens reusing a bigger token's ticker, and Clanker/Doppler/B20 launch platforms. Also honeypot and taxes, mint/pause/blacklist powers, upgradeable proxy, ownership and holders. Returns a 0-100 score, LOW/MEDIU

Korea premium per coin: Upbit and Bithumb KRW prices vs the Binance USDT price, converted with the ECB USD/KRW reference rate (date returned); without symbols, the top 20 Upbit markets by 24h KRW volume.

Timestamp a SHA-256 hash: returns a stored, server-signed receipt (id, hash, label, timestamp, signer, message, signature, verify URL) proving the hash was presented at that time.

Keyless multi-chain JSON-RPC reads, Base + Ethereum, from $0.001 (?chain=ethereum)

Signed plug-in solar legality record for one US state. Free preview: GET /solar-legality/preview A missing or unknown state returns 400 or 404; you are never charged for an error.

Locus public pay-per-use API

eBay listings search — live prices, condition, shipping, seller reputation, auctions & Buy It Now across supported regional eBay sites, with category, price band, condition, seller & location filters, sorted, as clean JSON.

Fetch a live https URL and score whether the deploy is actually there. POST {"url":"https://your.site","min_score":80} ($0.02). Default x402-seller profile: HTTPS, HSTS, llms.txt, catalog, OpenAPI, MCP, health. Optional claims[] or profile:"web". Returns 0–100, evidence, do_this_first, ci_failed. Humans: GET /v1/tools/claim-check/report?host=your.site. Badge goes stale after 7 days.

Mizan full report card: 57,020 x402 endpoints across 3,650 operators, knocked and measured — alive or dead, latency, x402 conformance, and the price actually demanded at the door versus the price advertised in the catalogue (335 demand more; 74 hand over the goods for free). For the 1,729 Mizan paid for: delivered, refused, or charged-and-delivered-nothing, each reconciled against the Base chain.