WARM verifiable agent memory

$0.10 USDC per call · Agent infrastructure · POST /api/v1/warm-memory · Id warm-memory

Persistent memory for AI agents as a pay-per-call API, no database to run. op=remember stores subject-predicate-object facts (or extracts them from free text; only facts whose subject and object appear verbatim are kept); a newer value for the same subject and predicate supersedes the old one, and the history stays queryable. op=recall searches by BM25 keyword ranking or exact triple pattern, now or as of any past date. op=forget deletes the content and leaves a tombstone; op=explain returns provenance and the supersession chain. Every fact has a ToIP SAID and every write returns a hash-chained receipt (signed when the hub has a signing key). Memory is private to the paying wallet (API-key callers pass a tenantId). Limits: 50 facts and 8,000 characters of text per call, 10,000 live facts per tenant. Retrieval is keyword-based, not semantic embeddings.

What you get

Agents that persist what they learned, answer 'what was true on date X', and prove what they stored or forgot, without running their own database.

Call it

Send the JSON body below to https://agents.writerslogic.com/api/v1/warm-memory. An unpaid request answers 402 with the price and how to pay; a request that fails with a 5xx status is not charged.

curl -i -X POST https://agents.writerslogic.com/api/v1/warm-memory \
  -H 'content-type: application/json' \
  -d '{"op":"remember","facts":[{"subject":"alice","predicate":"lives_in","object":"Paris","validFrom":"2020-01-01"},{"subject":"alice","predicate":"lives_in","object":"Berlin","validFrom":"2025-01-01"}]}'

Input

Field	Type	Required	Description
`op`	string; one of "remember", "recall", "forget", "explain"	yes
`tenantId`	string	no	Required for API-key callers (namespace as key:<tenantId>; keep it unguessable). Ignored when a wallet paid.
`facts`	array<object>; max 50 items	no
`text`	string; length 0..8000	no	remember: free text; facts are extracted by a fast model and kept only if subject and object occur verbatim.
`source`	string; length 0..500	no	remember: provenance label for facts extracted from text.
`query`	string; length 0..500	no
`pattern`	object	no	Exact (case- and whitespace-insensitive) match on any of subject, predicate, object.
`said`	string	no
`asOf`	one of	no	Epoch milliseconds or an ISO 8601 date/time (UTC when no offset).
`limit`	integer; 1..50	no
`history`	string; one of "current", "all"	no	recall: only facts current at asOf (default) or every status.

Example request body

{
  "op": "remember",
  "facts": [
    {
      "subject": "alice",
      "predicate": "lives_in",
      "object": "Paris",
      "validFrom": "2020-01-01"
    },
    {
      "subject": "alice",
      "predicate": "lives_in",
      "object": "Berlin",
      "validFrom": "2025-01-01"
    }
  ]
}

Result

The response is { "data": ..., "_provenance": ... }. data carries these fields; _provenance is a signed W3C Verifiable Credential with a C2PA-style manifest, checked free at POST /api/v1/verify-provenance.

Field	Type	Required	Description
`op`	string	no
`tenant`	string	no
`summary`	string	no	One line: what happened, e.g. "Stored 2 new facts, 1 earlier fact superseded."
`next`	string	no	The most useful follow-up call.
`warnings`	array<string>	no	Degraded steps, e.g. text extraction unavailable while structured facts were stored.
`remembered`	array<object>	no
`results`	array<object>	no
`forgotten`	array<object>	no
`receipt`	object	no	{op, seq, saids, digest, at, prevReceiptDigest, signature?, signer?}
`deterministic`	object	no

Pay and connect

Available through: x402 (USDC on Base), MCP.

Machine-readable

This agent as JSON (schemas, example, OpenAPI operation)
Free signed sample response
OpenAPI 3.1 · Catalog · Index of every agent