Blockchain And Crypto x402 offerings

x402 services first listed since a given date, with first archive observation and early-traction evidence from observed inflow. Entrants MCPFax can attribute — a declared payTo, an observed title, or observed inflow — rank first, and each row says which it carries. A window identifying nobody is refused 422 and charges nothing. Requests before the archive's first date are partially covered.

Daily state of the x402 agent economy: observed USDC inflow, seller ranking, category demand, growth, and coverage. Reports its real observation window; concentration adjustment applied only when scan coverage supports it. A FREE register-wide change digest covering the same domain is market_digest on the x402-observatory gateway; buy this for the derived figures, not for what merely changed.

Base gas price — Live Base mainnet gas price from JSON-RPC.

Crypto spot prices — Coinbase spot prices for up to ten assets.

x402 paid APIs for AI agents on Base. Blockchain, wallet, DEX, crypto, web search.

Live gas on Ethereum, Base, Arbitrum, Optimism, Polygon — base fee, priority fee tiers, and USD transfer cost, straight from chain RPC.

A monitor with memory over registered trials. The first call stores a snapshot and returns the baseline explicitly marked as such rather than reporting everything as new. Each later call with the returned token compares the current registry state and reports the differences: recruitment status, enrolment target, primary and overall completion dates, the number of sites, and whether results have been posted.

Answers whether a drug carries a boxed warning, the strongest warning class the FDA applies, and returns the warning text with the label version it came from. The check runs across multiple labels for the same substance rather than the first hit, because labels are maintained independently by each manufacturer and the same generic can carry a boxed warning at one and not at another; taking the first result and answering no is how this question gets answered wrongly.

Returns the hazard profile of a chemical: GHS pictograms, signal word, hazard statements and precautionary statements where they are recorded, together with the physical properties that govern handling — melting and boiling point, flash point, density, vapour pressure, solubility and autoignition temperature. Every statement carries the organisation that contributed it, and that attribution is the substance of the service rather than a citation courtesy.

Retrieves the eligibility section of a registered trial and separates it into inclusion and exclusion criteria as individual items, each classified where the classification is unambiguous and each carrying the verbatim source sentence. The source sentence is the substance rather than a nicety: eligibility criteria decide whether a person can enter a study, a structured item without its origin cannot be checked, and a wrongly structured one goes unnoticed.

Resolves a gene symbol or identifier and returns the corresponding identifiers across NCBI and Ensembl: the gene with its Entrez and Ensembl identifiers, the genomic location with assembly, the biotype, the description, and the transcripts with their protein products.

Searches the device recall database for a product, manufacturer or model and returns each matching recall with the classification and its meaning, the reason, the recalling firm, the dates, the status and — the field that decides whether a specific unit is affected — the product description including lot numbers and serial ranges, quoted verbatim.

Takes any of the names a medicine goes by and returns the canonical identity behind it: the RxNorm concept with its identifier and term type, the active ingredients with their own identifiers, the strengths, the dose forms, and the brand names under which the same substance is sold. Term types are expanded rather than returned as codes, because the difference between an ingredient concept, a clinical drug and a branded pack determines what an identifier can be used for.

Returns the sections of an official drug label sorted by clinical significance rather than document order, with the text passed through word for word. Nothing is summarised and nothing is shortened: a summary is by definition an omission, and an omitted contraindication is the kind of omission that matters. A caller who needs a shorter version can produce one from the complete text supplied here, which is the right order of operations.

Searches the FDA enforcement database for drug recalls matching a product name, company or date range and returns each with the classification leading: class one means use can cause serious harm or death, class three means it will not, and a recall for a wrong label colour and one for contamination share only the word. The class is therefore returned with its meaning spelled out rather than as a bare code.

Returns the participating sites of a registered trial, each with the facility name, city, state and country, the coordinates the registry holds, the recruitment status of that site specifically, and any publicly listed contact. Site status is reported separately from trial status and that separation is the point: a trial can be recruiting overall while the nearest site has stopped, and the reverse happens too, so applying the trial status to every site sends someone to a closed door.

Searches the clinical trial registry and returns matching studies with the fields that decide whether a trial is relevant: the recruitment status translated from the registry code, the phase, the study type, the enrolment target, the conditions and interventions, the sponsor, the start and completion dates, and the countries with sites.

Takes any common identifier for a chemical and returns the canonical PubChem compound: the CID, molecular formula, molecular weight, canonical and isomeric SMILES, InChI and InChI key, the IUPAC name, and the computed properties that decide most downstream work — logP, exact mass, polar surface area, hydrogen bond donors and acceptors, rotatable bonds and formal charge.

Pump.fun and Pump Fun Solana meme coin radar API for agents. Returns fresh-launch tokens with early traction, liquidity, short-window volume, and meme scores.

Pump.fun and Pump Fun Solana meme coin quality-volume API for agents. Ranks high-velocity tokens with liquidity, short-window volume, and meme scores.

Share your namespace with another wallet so different agents can coordinate through it. Grant read or readwrite access to a grantee wallet, optionally with a TTL. This is the cross-agent sharing a single agent cannot provide for itself.

List the wallets you've granted access to your namespace, with their mode and expiry.

Revoke a previously granted wallet's access to your namespace.

Pay once to receive a short-lived WebSocket ticket for the live Bitcoin mempool stream.